Patent Application
20210261901
The subject matter described herein relates to a cell engineering platform utilizing vector-free delivery.
Variability in cell transfection efficiency exists among different cell types. Transfection of suspension cells, e.g., non-adherent cells, has proven to be very difficult using conventional methods, particularly at scale.
The current subject matter provides a cell engineering platform that can scale a technique of vector-free delivery of payload/cargo compounds and compositions into non-adherent cells. The platform can achieve delivery to a large number of cells quickly. For example, some implementations of the platform can deliver to between 107 and 109 cells or more in a single use for both diagnostic and therapeutic uses. The platform can be a closed system, enable sterile transfection, can deliver mRNA and RNP (ribonucleoprotein particle) to primary T cells, is easy to use, enables repeatable delivery, and the like.
The platform can achieve delivery of a payload across a plasma membrane of a non-adherent cell by performing the steps of providing a population of non-adherent cells and contacting the population of cells with a volume of an aqueous solution, the aqueous solution including the payload and an alcohol at greater than 2 percent (v/v) concentration. For example, the alcohol comprises ethanol, e.g., greater than 5% ethanol. In some examples, the aqueous solution comprises between 5-30% ethanol, e.g., 12% or 25% ethanol. Other compositions are possible.
In an aspect, a method includes filling a chamber of a cell engineering platform with a mixture of cells and a first medium and discharging the first medium from the chamber to cause the mixture to pass through a filter, thereby leaving the cells deposited on the filter. The cell engineering platform can include a chamber, a lid disposed at a first end of the chamber, a base disposed at a second end of the chamber, and a filter holder disposed within the chamber.
One or more of the following features can be included in any feasible combination. The method can include spraying a delivery solution that contains a permeabilization agent and a payload to the cells deposited on the filter. The method can include applying a stop solution in the chamber. The method can further include filling the chamber with a second medium to resuspend the cells from the filter. The discharged first medium can be reused as the second medium. The method can include agitating the chamber. The method can include extracting the resuspended cells from the chamber. The filling the chamber can be performed automatically with a pump and a controller. The method can include culturing the cells within the chamber. The discharging the first medium from the chamber can be performed by supplying a positive pressure into the chamber. Alternatively or additionally, the discharging the first medium from the chamber can be performed by gravity. Further, the applying the stop solution can be performed to wash the cells. The filling the chamber with the second medium can be performed as a cell wash process, a cell concentration change process, and/or a cell medium change process.
In another aspect, a system includes a housing configured to receive a filter plate comprising a well; a differential pressure applicator configured to apply a differential pressure to the well; a delivery solution applicator configured to deliver atomized delivery solution to the well; a stop solution applicator configured to deliver a stop solution to the well; and a culture medium applicator configured to deliver a culture medium to the well.
One or more of the following features can be included in any feasible combination. The housing can include a chamber, a lid disposed at a first end of the chamber, and a base disposed at a second end of the chamber. The filter plate can be disposed within the chamber. The differential pressure applicator can be connected to the lid of the housing and include a shower head, which includes a plurality of apertures at an end portion thereof. The stop solution applicator can deliver the stop solution to the well through a septum provided in the lid of the housing. The culture medium applicator can deliver the culture medium to the well through a septum provided in the lid of the housing or through a port of the chamber. The housing can be configured to tilt the filter plate. The delivery solution applicator can include a robotic arm and spray head, the robotic arm magnetically coupled to the spray head. The system can include a soft elastomeric barrier enclosing the filter plate and spray head. The soft elastomeric barrier separates the robotic arm and the spray head. The robotic arm is configured to carry the spray head to a plurality of locations on the filter plate. The stop solution applicator and the culture medium applicator are formed integral within the housing as ports, and the housing forms a vessel. The vessel includes a waste media outlet for collecting waste media.
The system can further include a soft elastomeric barrier enclosing the filter plate and delivery solution applicator within the housing, the soft elastomeric barrier and the housing forming a bioreactor. The housing can include a filter plate base configured to tilt, rotate, and/or vibrate the filter plate.
The delivery solution applicator can include a robotic arm and spray head, and the spray head is a single-use cartridge. The filter plate can be sized to hold greater than 107 T cells. The system can be configured to automatically: provide to the filter plate cells in media; remove culture media to form a cellular monolayer on top of the filter plate; apply an atomized delivery solution to the cellular monolayer; incubate the cells; apply a stop solution to the incubated cellular monolayer; provide new media to the cellular monolayer; and tilt, vibrate, and/or rotate the filter plate to re-suspend the cells in the new media. The system is configured to repeat the application of the atomized delivery solution, the incubation, and the application of the stop solution.
The delivery solution applicator can include a nebulizer. The delivery solution applicator can be configured to deliver 10-300 microliters of the delivery solution per actuation. The system can further include a temperature control system configured to control a temperature of the delivery solution and/or of the plate comprising the well. The delivery solution can include an aqueous solution, the aqueous solution including the payload and an alcohol at greater than 2 percent (v/v) concentration. The alcohol comprises ethanol. The aqueous solution can include greater than 5% ethanol. The aqueous solution can include between 5-30% ethanol. The aqueous solution can include 12% or 25% ethanol. The aqueous solution can include between 12.5-500 mM KCl (potassium chloride). The aqueous solution can include 106 mM KCl.
The system can further include the filter plate, and the well can be configured to contain a population of non-adherent cells. The non-adherent cell can include a peripheral blood mononuclear cell. The non-adherent cell can include an immune cell. The non-adherent cell can include a T lymphocyte. The payload can include a messenger ribonucleic acid (mRNA). The mRNA can encode a gene-editing composition. The gene editing composition can reduce the expression of PD-1 (programmed cell death protein 1). The mRNA can encode a chimeric antigen receptor.
The system can be for use to deliver a cargo compound or composition to a mammalian cell. The population of non-adherent cells can include a monolayer.
In yet another aspect, a system can include a chamber a lid disposed at a first end of the chamber; a base disposed at a second end of the chamber; and a filter holder disposed within the chamber.
One or more of the following features can be included in any feasible combination. The filter holder can include a plurality of apertures arranged in a predetermined pattern. The filter holder can include a plurality of targets within which the plurality of apertures are arranged to allow cells to be deposited on a filter at areas corresponding to the plurality of apertures. The system can further include a gasket disposed between the filter holder and the base. The system can further include a filter holder insert received within the filter holder to accommodate the filter between the filter holder and the filter holder insert. The filter holder insert can include a concavely shaped top surface. The filter holder insert can include a plurality of openings corresponding to the plurality of targets. The filter holder can include three targets. The filter holder can include seven targets. The filter holder can include nineteen targets. The plurality of targets can be arranged in a square pattern, a rectangular pattern, a triangular patter, or a linear pattern.
The system can further include a controller configured to operate at least one of a pump, a valve, a heating element, a cooling element, and an agitation device. The pump can be a peristaltic pump or a positive displacement pump. The lid can further include a pressure port and an aperture. The base can include a port for receiving media or for draining the media. The lid can further include a septum. The pressure port can include a shower head, which includes a plurality of apertures at an end portion thereof. A 0.2 micron filter can be connected to the pressure port. The system can further include a pinch valve that is configured to open and close the pressure port to atmosphere through the 0.2 micron filter. The chamber of the system can include a port for extracting processed cells. The system can be sized to process greater than 1×109 T cells.
The details of one or more variations of the subject matter described herein are set forth in the accompanying drawings and the description below. Other features and advantages of the subject matter described herein will be apparent from the description and drawings, and from the claims.
Like reference symbols in the various drawings indicate like elements.
Despite some advances, delivery of certain particles and/or molecules into cells remains a challenge. Factors such as size or charge of a molecule to be delivered into a cell can limit and/or prevent delivery of the molecule into the cell. In particular, delivery across the cell membrane can be complicated due to the molecule and/or the membrane of the cell. A cell membrane or plasma is a semi-permeable biological membrane, which acts as a selective barrier. The membrane regulates an internal chemical composition of the cell. As the selective barrier for the cell, the membrane can allow only certain molecules to passively translocate across the membrane through, for example, passive diffusion into the cell. Small, hydrophobic molecules (such as O2, CO2, and N2) and small, uncharged polar molecules (such as H2O and glycerol) can passively diffuse across cell membranes. Larger, uncharged polar molecules (such as amino acids, glucose, and nucleotides) and ions (such as H+, Na+, K+ and Cl−) cannot passively diffuse across cell membranes.
An object of the present disclosure is to provide a vector-free delivery method to address the cost and complexity challenges for the cell engineering technologies. To provide a reliable and consistent method for cell therapies, the current subject matter provides a cell engineering method and platform to deliver compounds or mixtures of compounds (e.g., payload) into cells across cell membranes by contacting the cells with a delivery solution (e.g., vehicle) containing the payload and an agent that reversibly permeates or dissolves a cell membrane. In particular, the cells are supplied to a system in a suspension, a monolayer of the cells are formed by draining the suspension, the delivery solution is supplied (e.g., sprayed) to permeabilize the cells, and the payload is delivered across the permeabilized cell membranes.
Using a platform of some implementations of the present disclosure, other cell engineering processes may also be performed before and/or after the vector-free payload delivery process, which significantly enhances productivity and allows the overall process to be streamlined. Moreover, not only the non-viral transfection method but also viral methods may be performed within the single platform. Accordingly, example implementations of the platform can provide improved scalability over other methods and systems, and can treat 1011 cells or more at a single process.
In some implementations, the platform for payload delivery across cell membranes may be used for the vector-free payload delivery, the viral payload delivery, or a combination of vector-free and viral payload delivery. For example, after the cells are collected on the filter substrate by discharging the cell-containing medium through the filter, a solution that contains viral payload may be delivered to the collected cells, thereby performing the viral payload delivery in the platform. Additionally or alternatively, the vector-free and the viral payload delivery processes may be performed to the same cells within a single device, which may decrease the process steps, time, and/or cost, increase the cell throughput, survivability, and effectiveness of the treatment, and moreover, reduce cell contamination that may happen when the cells are transported between multiple devices. Additional aspects of viral payload delivery are discussed in U.S. Provisional Patent Application No. 62/855,241 filed May 31, 2019, entitled “Methods of Viral Delivery to A Population of Cells and Viral Production Thereof”, with attorney-docket number 048831-520P01US, the entire contents of which is hereby expressly incorporated by reference herein.
Further, some implementations of the current subject matter can provide a cell engineering platform that can scale a technique of vector-free delivery of payload/cargo compounds and compositions into non-adherent cells. The example platform can achieve delivery to a large number of cells quickly. For example, some implementations of the platform can deliver to between 107 and 109 cells or more in a single use. The platform can be a closed system, enable sterile transfection, can deliver mRNA and RNP to primary T cells, is easy to use, enables repeatable delivery, and the like. For another example, human embryonic kidney (HEK) cells may be treated using the platform according to the present disclosure.
The platform can achieve delivery of a payload across a plasma membrane of a non-adherent cell by performing the steps of providing a population of non-adherent cells and contacting the population of cells with a volume of an aqueous solution, the aqueous solution including the payload and an alcohol at greater than 2 percent (v/v) concentration. For example, the alcohol comprises ethanol, e.g., greater than 5% ethanol. In some examples, the aqueous solution comprises between 5-30% ethanol, e.g., 12% or 25% ethanol. Other compositions are possible.
The current subject matter also provides a platform that can automate the vector-free and/or the viral payload delivery process and allow the process to be performed at various scales. When cells are manually loaded to the platform and/or manually unloaded from the platform, the throughput of the system is limited, and difficulties exist in applying to clinical process/treatment. There may be concerns for contamination and inconsistent process depending on operators and/or various environmental parameters. By the process automation, the vector-free payload delivery process can be performed more consistently, a concern for contamination can be significantly reduced, and therefore, the system can be scaled more easily. Hereinbelow, exemplary embodiments of the platform to perform the vector-free payload delivery process with automated processes will be described.
The chamber 110 is enclosed by a chamber wall. To provide an optical observation capability, the chamber wall may include (e.g., be made of) a clear plastic material such as polypropylene, acrylic, polycarbonate, and the like. The chamber wall may have an overall shape of a cylindrical shell with a top and a bottom surfaces thereof open, and a diameter and a height of the chamber 110 may be determined based on applications and system requirements. For example, the chamber 110 may have an internal diameter of 110 mm. Alternatively or additionally, the chamber 110 may include a flat surface to facilitate an optical imaging device to be used for monitoring and/or controlling the transfection process. Although the chamber 110 is shown as a cylindrical shell, the present disclosure is not limited thereto, and the chamber 100 may have various shapes, for example, square, rectangular, and triangular shapes as well as a configuration in which cell targets are arranged in a linear configuration.
Alternatively or additionally, the pressure port 122 may allow the chamber 110 to be connected to (e.g., exposed to) an ambient pressure. Further, the pressure port 122 may allow the chamber to be connected to an ambient pressure through a filter. The filter may be, for example, a 0.2 micron filter. The filter may also be a nano particle filter and/or a high efficiency particulate air (HEPA) filter. When the pressure port 122 is connected to the ambient pressure through the filter, the chamber 110 may be drained due to gravity instead of the pressure source. To open or close the pressure port, a valve may be disposed upstream of the filter. For example, the valve may be a pinch valve.
The lid 120 may include (e.g., be made of) a stainless steel material such as SS316, a plastic material, or the like. The lid 120 may also include at least one aperture 123 to accommodate an atomizer, a sensor, or the like. The sensor may include one or more of a temperature sensor, a humidity sensor, and a pressure sensor. When an atomizer is mounted in the at least one aperture 123, the atomizer may be mounted through an orientation adjustment device such as a gimbal to allow adjustment of the atomizer orientation. In some implementations, the lid 120 may include at least one mounting aperture 124 to accommodate a post 170 to fix the lid 120 to the post 120 and support the platform 100.
In some embodiments, the platform 100 may include a gasket 160, for example, a rubber gasket, to provide a seal between the base 130 and a bottom surface of the filter holder 140. The seal between the base 130 and the filter holder 140 prevents the cell medium from flowing between the base 130 and the filter holder 140, allows the entire cell medium to flow through the filters, and thereby increases the cell collection efficiency. As shown in
In some embodiments, the platform 100 includes a pump such as a peristaltic pump or a positive displacement pump along with a valve to automatically control the fluid flows. The pump may be controlled by the controller. The controller may also control the atomizer, the temperature/pressure sensor, the heating element of the base, and the vibration device. For the atomizer control, a human machine interface (HMI) (e.g., Omron NB3Q-TW01B 5-inch HMI) and programmable logic controller (PLC) (e.g., Omron NX1 NX1P29024DT1 PLC) hardware platforms with a 3 channel Gyger controller printed circuit board (PCB) may be included in the controller. The controller may include a plurality of modules that are responsible for controlling respective elements of the platform. The controller may also include a processor configured to execute program instructions to perform the vector-free payload delivery processes, to operate input/output devices for user interface, and to operate communication modules to connect the platform to a network.
Referring to
After the valves are closed, and the chamber is sealed, the medium is discharged through the filters, thereby depositing the target cells (e.g., T cells) on the filter surfaces (Step S12). For example, a positive pressure may be supplied to the chamber through the central pressure port of the lid. After the medium is discharged from the chamber, a vacuum pressure may be supplied to the chamber to release remaining positive pressure within the chamber. Removing the remaining positive pressure with the vacuum pressure may or may not be required. In some implementations, the positive pressure and the vacuum pressure may be alternatingly supplied to the chamber during the discharge of the medium to adjust/rearrange the cell deposition on the filters. The medium may also be discharged by opening a valve, for example a pinch valve, to expose the pressure port of the lid to the ambient pressure and drain the medium by gravity. A filter such as a 0.2 micron filter may be disposed at the pressure port to prevent foreign particulate matter from entering the chamber.
Accordingly, the cell deposition pattern can be controlled and restricted to the areas where the cells are deposited on the filter as a monolayer. Herein, a “monolayer” of cells may refer to the cells distributed substantially horizontally and forming one or more vertical layers of cells. The monolayer may include one cell layer, one to two cell layers, one to three cell layers, one to five cell layers, or more. The number of cell layers are not limited thereto, and the monolayer may refer to any number of cell layers in some implementations.
Subsequently, the delivery solution containing the cell permeabilization agent and the payload (e.g., cargo) is sprayed via the atomizer (Step S13). The controller may control the amount and duration of the spray. For example, the delivery solution may be sprayed for about 300 ms. For spraying the delivery solution, the cargo may be introduced to the spray head via microvial or injected via resealable injection port.
After the delivery solution is sprayed, a stop solution is introduced via a disposable tube set and/or sterile plastic needle/cannula (Step S14). The stop solution may be supplied to the chamber through a septum or a port in the lid. The stop solution may be supplied manually, or may be supplied automatically using the pump and the controller. A desired amount of stop solution is introduced into the chamber. For example, about 10 mL of stop solution may be introduced over about 20 seconds. Step S14, however, is not limited to the stop solution application, and may also provide a cell wash process depending on the composition of the applied solution.
Following the introduction of the stop solution, the cells are resuspended (Step S15). For the resuspension, about 60 mL medium, which may be a used, new medium or the medium that was previously drained from the chamber, can be introduced by a syringe or a pump. The new medium may be supplied into the chamber through a septum or a port in the lid. Alternatively or additionally, the new medium may be supplied into the chamber from below the filter through a drainage hole. The new medium may be supplied into the chamber by injecting the new medium into the chamber with a positive pressure or by applying a vacuum pressure (e.g., through the pressure port 122) to the chamber, and thereby allowing the chamber to take in the new medium. The duration for the resuspension step may be about 3 seconds to about 1 minute, for example. In some implementations, to improve resuspension, various methods such as tilting of the platform, agitation (e.g., vibration of the platform), and the like may be used during the resuspension process or after the resuspension process. Step S15, however, is not limited to the resuspension step, and may also provide a cell concentration change process, a cell wash process, and/or a cell medium change process. The cell concentration change process, the cell wash process, and/or the cell medium change process may also be performed in Steps S11 and S12 by refilling the chamber after Step S12 and repeating the discharge/refill process multiple times as necessary.
After the cells are resuspended in the medium, the engineered cells are collected for further processes (Step S16). Alternatively or additionally, the engineered cells may be cultured within the chamber before they are collected and/or further processed. The platform may be flushed or washed after the process for subsequent procedures. Alternatively or additionally, the entire chamber or a part of the chamber may be made as a disposable unit that can be disposed after a use and replaced with a new one.
Referring to
The gas (e.g., air) flow may be controlled by a mass flow controller or a volumetric flow controller. By using the mass/volume flow controller, a constant amount (e.g., a constant mass and/or a constant volume) of gas may be supplied through the atomizer 1100, thereby ensuring a constant amount of liquid to be sprayed and the droplet sizes to be maintained consistently, regardless of pressure, temperature, humidity, on/off timing variations in the chamber, or the like. Mass/volume flow regulation may also permit more accurate and repeatable dosing of atomized solution to the cells. By actively controlling the mass/volume flow rate of the driving gas, the spray plume is less susceptible to variability in plume density, angle, velocity, vortex formation, droplet size, deposition area, or the like, which results in more repeatable and consistent transfection performance.
The exemplary embodiments described in the Example 1 section can transfect from about 107 to about 109 cells or more in a single transfection. The platform can allow consistent delivery of cargos, such as mRNA and the like, to T cells. The system may be enclosed within a biosafety cabinet for a sterile operation, or may be made as a closed system to be used in any environment. The operation of the platform may be performed manually or automatically. For the automated operation, the fluid handling system can be controlled automatically via the controller and control software. The platform may be configured as a multiple-use system, which can be reused after cleaning and washing. In some implementations, the platform may be configured as a single use disposable system, which includes disposable parts such as a disposable chamber unit. In some implementations, the platform may be used for the vector-free payload delivery across cell membranes and/or the viral payload delivery across cell membranes.
Due to the process automation, the cell engineering platform can perform the vector-free payload delivery process more consistently, contamination can be minimized, and therefore, the system can be scaled. Accordingly, the cell engineering platform can provide reliable vector-free delivery method to reduce the cost and complexity of the cell engineering technologies.
The robotic arm 1701 can carry the spray head to multiple locations within the elastomeric dome 1702 for spraying solution onto cells formed into a monolayer on the filter base 1703. In addition, the filter base 1703 can tilt and rotate to bath cells with reagents.
In some embodiments, the cells can include adherent cells or non-adherent cells. The adherent cells can include at least one of primary mesenchymal stem cells, fibroblasts, monocytes, macrophages, lung cells, neuronal cells, fibroblasts, human umbilical vein (HUVEC) cells, Chinese hamster ovary (CHO) cells, and human embryonic kidney (HEK) cells or immortalized cells, such as cell lines. In preferred embodiments, the population of cells comprises non-adherent cells, e.g., the % non-adherent cells in the population is at least 50%, 60%, 75%, 80%, 90%, 95%, 98%, 99% or 100% non-adherent cells. Non-adherent cells primary cells as well as immortalized cells (e.g., cells of a cell line). Exemplary non-adherent/suspension cells include primary hematopoietic stem cell (HSC), T cells (e.g., (cluster of differentiation 3) CD3+ cells, (cluster of differentiation 4) CD4+ cells, (cluster of differentiation 8) CD8+ cells), natural killer (NK) cells, cytokine-induced killer (CIK) cells, human cord blood CD34+ cells, B cells, or cell lines such as Jurkat T cell line. Non limiting examples of T cells may include CD8+ or CD4+ T cells. In some aspects, the CD8+ subpopulation of the CD3+ T cells are used. CD8+ T cells may be purified from the PBMC population by positive isolation using anti-CD8 beads.
In examples, cells are cultured in standard cell culture media, e.g., complete RPMI (Roswell Park Memorial Institute medium) using RPMI basal medium, heat-inactivated fetal bovine serum (FBS), e.g., about 10% v/v, penicillin-streptomycin, and L-glutamine. In some examples, the standard culture media can be supplemented with cytokines, e.g., Interleukin-2 (IL-2) (200 U/ml).
In embodiments, the cytokines can be at a concentration from about 10 U/ml to about 500 U/ml. In other examples, the cytokines can be at a concentration of about 50 U/ml, about 100 U/ml, about 200 U/ml, about 300 U/ml, about 400 U/ml, or about 500 U/ml. The cytokine concentration can be about 200 U/ml.
In some examples, cell-compatible culture media are used in the delivery methods. For example, Prime-XV (Irvine Scientific) and X-Vivo (Lonza) are serum-free and animal component free media that can be used.). In some examples, the cell culture media was supplemented with a higher concentration of cytokines. The cytokines can include, for example, interleukin-2 (IL-2), to enhance the rate of proliferation (Tumeh P, et al., J Immunother 2010. 33(6): 759-768 and Besser M J, et al., Cytotherapy 2009. 11:206-217). In other examples, the culture medium can include Immunocult™-XF Expansion Medium (StemCell Technologies). Like Prime XV, it is also a serum-free, xeno-free T cell culture medium. In some examples, TexMACS (Miltenyi Biotech) may be used as an alternative serum-free medium for T-cell culture. CTS OpTmizer T Cell Expansion SFM may also be used as an alternative serum-free medium for T cell culture.
In embodiments, the molecular cargo (e.g., payload) can include gene editing tools, a small chemical molecule, a peptide or protein, or a nucleic acid. The payload can comprise a messenger ribonucleic acid (mRNA). The mRNA can encode a gene-editing composition. The mRNA can encode a chimeric antigen receptor.
In additional embodiments, the molecular cargo (e.g., payload) to be delivered may include a composition that edits genomic DNA (i.e., gene editing tools). For example, the gene editing composition may include a compound or complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA. Alternatively or in addition, a gene editing composition may include a compound that (i) may be included a gene-editing complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA; or (ii) may be processed or altered to be a compound that is included in a gene-editing complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA. In various embodiments, the gene editing composition comprises one or more of (a) gene editing protein; (b) RNA molecule; and/or (c) ribonucleoprotein (RNP).
In some embodiments, the gene editing composition comprises a gene editing protein, and the gene editing protein is a zinc finger nuclease (ZFN), a transcription activator-like effector nuclease (TALEN), a Cas protein, a Cre recombinase, a Hin recombinase, or a Flp recombinase. In additional embodiments, the gene editing protein may be a fusion proteins that combine homing endonucleases with the modular DNA binding domains of TALENs (megaTAL). For example, megaTAL may be delivered as a protein or alternatively, a mRNA encoding a megaTAL protein is delivered to the cells.
In embodiments, the molecular cargo (e.g., payload) can include a small chemical molecule. The small chemical molecule can be less than 1,000 Da. The chemical molecule can include MitoTracker® Red CMXRos, propidium iodide, methotrexate, and/or DAPI (4′,6-diamidino-2-phenylindole).
In embodiments, the molecular cargo can be a peptide. The peptide can be about 5,000 Da. The peptide can include ecallantide under trade name Kalbitor, is a 60 amino acid polypeptide for the treatment of hereditary angioedema and in prevention of blood loss in cardiothoracic surgery), Liraglutide (marketed as the brand name Victoza, is used for the treatment of type II diabetes, and Saxenda for the treatment of obesity), and Icatibant (trade name Firazyer, a peptidomimetic for the treatment of acute attacks of hereditary angioedema). The small-interfering ribonucleic acid (siRNA) molecule can be about 20-25 base pairs in length, or can be about 10,000-15,000 Da. The siRNA molecule can reduces the expression of any gene product, e.g., knockdown of gene expression of clinically relevant target genes or of model genes, e.g., glyceraldehyde-3phosphate dehydrogenase (GAPDH) siRNA, GAPDH siRNA-FITC, cyclophilin B siRNA, and/or lamin siRNA. Protein therapeutics can include peptides, enzymes, structural proteins, receptors, cellular proteins, or circulating proteins, or fragments thereof. The protein or polypeptide be about 100-500,000 Da, e.g., 1,000-150,000 Da. The protein can include any therapeutic, diagnostic, or research protein or peptide, e.g., beta-lactoglobulin, ovalbumin, bovine serum albumin (BSA), and/or horseradish peroxidase. In other examples, the protein can include a cancer-specific apoptotic protein, e.g., Tumor necrosis factor-related apoptosis inducing protein (TRAIL).
An antibody is generally be about 150,000 Da in molecular mass. The antibody can include an anti-actin antibody, an anti-GAPDH antibody, an anti-Src antibody, an anti-Myc ab, and/or an anti-Raf antibody. The antibody can include a green fluorescent protein (GFP) plasmid, and a GLuc plasmid. The DNA molecule can be greater than 5,000,000 Da. In some examples, the antibody can be a murine-derived monoclonal antibody, e.g., ibritumomab tiuxetin, muromomab-CD3, tositumomab, a human antibody, or a humanized mouse (or other species of origin) antibody. In other examples, the antibody can be a chimeric monoclonal antibody, e.g., abciximab, basiliximab, cetuximab, infliximab, or rituximab. In still other examples, the antibody can be a humanized monoclonal antibody, e.g., alemtuzamab, bevacizumab, certolizumab pegol, daclizumab, gentuzumab ozogamicin, trastuzumab, tocilizumab, ipilimumamb, or panitumumab. The antibody can comprise an antibody fragment, e.g., abatecept, aflibercept, alefacept, or etanercept. The invention encompasses not only an intact monoclonal antibody, but also an immunologically-active antibody fragment, e. g., a Fab or (Fab)2 fragment; an engineered single chain Fv molecule; or a chimeric molecule, e.g., an antibody which contains the binding specificity of one antibody, e.g., of murine origin, and the remaining portions of another antibody, e.g., of human origin.
The molecular cargo (e.g., payload) can include a therapeutic agent. A therapeutic agent, e.g., a drug, or an active agent”, can mean any compound useful for therapeutic or diagnostic purposes, the term can be understood to mean any compound that is administered to a patient for the treatment of a condition. Accordingly, a therapeutic agent can include, proteins, peptides, antibodies, antibody fragments, and small molecules. Therapeutic agents described in U.S. Pat. No. 7,667,004 “Humanized antibodies against vascular endothelial growth factor” (incorporated herein by reference) can be used in the methods described herein. The therapeutic agent can include at least one of cisplatin, aspirin, statins (e.g., pitavastatin, atorvastatin, lovastatin, pravastatin, rosuvastatin, simvastatin, promazine hydrochloric acid (HCl), chloropromazine HCl, thioridazine HCl, Polymyxin B sulfate, chloroxine, benfluorex HCl and phenazopyridine HCl), and fluoxetine. The payload can include a diagnostic agent. The diagnostic agent can include a detectable label or marker such as at least one of methylene blue, patent blue V, and indocyanine green. The payload can include a fluorescent molecule. The payload can include a detectable nanoparticle. The nanoparticle can include a quantum dot.
In some implementations, the cargo can include linear DNA or DNA plasmid.
In an example, following delivery, the cells are incubated prior to the addition of Stop Solution. In examples, the Stop Solution includes phosphate buffered saline (PBS). The concentration of PBS can be about 0.5×PBS.
In some implementations, the delivery solution can be formulated by a GMP (Good Manufacturing Provider) provider and can be provided in a foil-top 10 mL vial. Separate drug master file (DMF) put on file for delivery solution. Stability testing and Certificate of Analysis (C of A) provided, and suppliers of current Good Manufacturing Practices (cGMPs) are utilized.
For some example implements, the starting material may include cluster of differentiation 3 (CD3+) T cells or PBMC cells (peripheral blood mononuclear cells). The cells may be activated by various methods, including Dynabeads (e.g., Dynabead CTS (Cell Therapy System) beads), soluble CD3/CD28 (cluster of differentiation 28) antibody, or TransAct for T cell activation. T Cell TransAct is a polymeric nanomatrix conjugated to humanized recombinant CD3 and CD28 agonists ensuring successful activation of resting T cells from hematological cell populations (e.g. PBMCs or enriched T cell populations) without the involvement of CD4 (cluster of differentiation 4) or CD8 (cluster of differentiation 8).
In some embodiments, the system input can include cells, culture media, molecular cargo, stop solution and air and/or gas.
In some embodiments, the cells can include adherent cells or non-adherent cells. The adherent cells can include at least one of primary mesenchymal stem cells, fibroblasts, monocytes, macrophages, lung cells, neuronal cells, fibroblasts, human umbilical vein (HUVEC) cells, Chinese hamster ovary (CHO) cells, and human embryonic kidney (HEK) cells or immortalized cells, such as cell lines. In preferred embodiments, the population of cells comprises non-adherent cells, e.g., the % non-adherent cells in the population is at least 50%, 60%, 75%, 80%, 90%, 95%, 98%, 99% or 100% non-adherent cells. Non-adherent cells primary cells as well as immortalized cells (e.g., cells of a cell line). Exemplary non-adherent/suspension cells include primary hematopoietic stem cell (HSC), T cells (e.g., (cluster of differentiation 3) CD3+ cells, (cluster of differentiation 4) CD4+ cells, (cluster of differentiation 8) CD8+ cells), natural killer (NK) cells, cytokine-induced killer (CIK) cells, human cord blood CD34+ cells, B cells, or cell lines such as Jurkat T cell line. Non limiting examples of T cells may include CD8+ or CD4+ T cells. In some aspects, the CD8+ subpopulation of the CD3+ T cells are used. CD8+ T cells may be purified from the PBMC population by positive isolation using anti-CD8 beads.
In examples, cells are cultured in standard cell culture media, e.g., complete RPMI (Roswell Park Memorial Institute medium) using RPMI basal medium, heat-inactivated fetal bovine serum (FBS), e.g., about 10% v/v, penicillin-streptomycin, and L-glutamine. In some examples, the standard culture media can be supplemented with cytokines, e.g., Interleukin-2 (IL-2) (200 U/ml).
In embodiments, the cytokines can be at a concentration from about 10 U/ml to about 500 U/ml. In other examples, the cytokines can be at a concentration of about 50 U/ml, about 100 U/ml, about 200 U/ml, about 300 U/ml, about 400 U/ml, or about 500 U/ml. The cytokine concentration can be about 200 U/ml.
In some examples, cell-compatible culture media are used in the delivery methods. For example, Prime-XV (Irvine Scientific) and X-Vivo (Lonza) are serum-free and animal component free media that can be used.). In some examples, the cell culture media was supplemented with a higher concentration of cytokines. The cytokines can include, for example, interleukin-2 (IL-2), to enhance the rate of proliferation (Tumeh P, et al., J Immunother 2010. 33(6): 759-768 and Besser M J, et al., Cytotherapy 2009. 11:206-217). In other examples, the culture medium can include Immunocult™-XF Expansion Medium (StemCell Technologies). Like Prime XV, it is also a serum-free, xeno-free T cell culture medium. In some examples, TexMACS (Miltenyi Biotech) may be used as an alternative serum-free medium for T-cell culture.
In embodiments, the molecular cargo (e.g., payload) can include gene editing tools, a small chemical molecule, a peptide or protein, or a nucleic acid. The payload can comprise a messenger ribonucleic acid (mRNA). The mRNA can encode a gene-editing composition. The mRNA can encode a chimeric antigen receptor.
In additional embodiments, the molecular cargo (e.g., payload) to be delivered may include a composition that edits genomic DNA (i.e., gene editing tools). For example, the gene editing composition may include a compound or complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA. Alternatively or in addition, a gene editing composition may include a compound that (i) may be included a gene-editing complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA; or (ii) may be processed or altered to be a compound that is included in a gene-editing complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA. In various embodiments, the gene editing composition comprises one or more of (a) gene editing protein; (b) RNA molecule; and/or (c) ribonucleoprotein (RNP).
In some embodiments, the gene editing composition comprises a gene editing protein, and the gene editing protein is a zinc finger nuclease (ZFN), a transcription activator-like effector nuclease (TALEN), a Cas protein, a Cre recombinase, a Hin recombinase, or a Flp recombinase. In additional embodiments, the gene editing protein may be a fusion proteins that combine homing endonucleases with the modular DNA binding domains of TALENs (megaTAL). For example, megaTAL may be delivered as a protein or alternatively, a mRNA encoding a megaTAL protein is delivered to the cells.
In embodiments, the molecular cargo (e.g., payload) can include a small chemical molecule. The small chemical molecule can be less than 1,000 Da. The chemical molecule can include MitoTracker® Red CMXRos, propidium iodide, methotrexate, and/or DAPI (4′,6-diamidino-2-phenylindole).
In embodiments, the molecular cargo can be a peptide. The peptide can be about 5,000 Da. The peptide can include ecallantide under trade name Kalbitor, is a 60 amino acid polypeptide for the treatment of hereditary angioedema and in prevention of blood loss in cardiothoracic surgery), Liraglutide (marketed as the brand name Victoza, is used for the treatment of type II diabetes, and Saxenda for the treatment of obesity), and Icatibant (trade name Firazyer, a peptidomimetic for the treatment of acute attacks of hereditary angioedema). The small-interfering ribonucleic acid (siRNA) molecule can be about 20-25 base pairs in length, or can be about 10,000-15,000 Da. The siRNA molecule can reduces the expression of any gene product, e.g., knockdown of gene expression of clinically relevant target genes or of model genes, e.g., glyceraldehyde-3phosphate dehydrogenase (GAPDH) siRNA, GAPDH siRNA-FITC, cyclophilin B siRNA, and/or lamin siRNA. Protein therapeutics can include peptides, enzymes, structural proteins, receptors, cellular proteins, or circulating proteins, or fragments thereof. The protein or polypeptide be about 100-500,000 Da, e.g., 1,000-150,000 Da. The protein can include any therapeutic, diagnostic, or research protein or peptide, e.g., beta-lactoglobulin, ovalbumin, bovine serum albumin (BSA), and/or horseradish peroxidase. In other examples, the protein can include a cancer-specific apoptotic protein, e.g., Tumor necrosis factor-related apoptosis inducing protein (TRAIL).
An antibody is generally be about 150,000 Da in molecular mass. The antibody can include an anti-actin antibody, an anti-GAPDH antibody, an anti-Src antibody, an anti-Myc ab, and/or an anti-Raf antibody. The antibody can include a green fluorescent protein (GFP) plasmid, and a GLuc plasmid. The DNA molecule can be greater than 5,000,000 Da. In some examples, the antibody can be a murine-derived monoclonal antibody. e.g., ibritumomab tiuxetin, muromomab-CD3, tositumomab, a human antibody, or a humanized mouse (or other species of origin) antibody. In other examples, the antibody can be a chimeric monoclonal antibody, e.g., abciximab, basiliximab, cetuximab, infliximab, or rituximab. In still other examples, the antibody can be a humanized monoclonal antibody, e.g., alemtuzamab, bevacizumab, certolizumab pegol, daclizumab, gentuzumab ozogamicin, trastuzumab, tocilizumab, ipilimumamb, or panitumumab. The antibody can comprise an antibody fragment, e.g., abatecept, aflibercept, alefacept, or etanercept. The invention encompasses not only an intact monoclonal antibody, but also an immunologically-active antibody fragment, e. g., a Fab or (Fab)2 fragment; an engineered single chain Fv molecule; or a chimeric molecule, e.g., an antibody which contains the binding specificity of one antibody, e.g., of murine origin, and the remaining portions of another antibody, e.g., of human origin.
The molecular cargo (e.g., payload) can include a therapeutic agent. A therapeutic agent, e.g., a drug, or an active agent”, can mean any compound useful for therapeutic or diagnostic purposes, the term can be understood to mean any compound that is administered to a patient for the treatment of a condition. Accordingly, a therapeutic agent can include, proteins, peptides, antibodies, antibody fragments, and small molecules. Therapeutic agents described in U.S. Pat. No. 7,667,004 “Humanized antibodies against vascular endothelial growth factor” (incorporated herein by reference) can be used in the methods described herein. The therapeutic agent can include at least one of cisplatin, aspirin, statins (e.g., pitavastatin, atorvastatin, lovastatin, pravastatin, rosuvastatin, simvastatin, promazine hydrochloric acid (HCl), chloropromazine HCl, thioridazine HCl, Polymyxin B sulfate, chloroxine, benfluorex HCl and phenazopyridine HCl), and fluoxetine. The payload can include a diagnostic agent. The diagnostic agent can include a detectable label or marker such as at least one of methylene blue, patent blue V, and indocyanine green. The payload can include a fluorescent molecule. The payload can include a detectable nanoparticle. The nanoparticle can include a quantum dot.
In an example, following delivery, the cells are incubated prior to the addition of Stop Solution. In examples, the Stop Solution includes phosphate buffered saline (PBS). The concentration of PBS can be about 0.5×PBS.
The current subject matter can include a number of components including, for example, accelerated product introduction, acoustics, additive manufacturing, adhesive, advanced assembly, automation, device integration, digital prototyping, dynamic tuning, fluidics, human machine interface, optical communications, optics, power electronics, precision injection mold tooling, precision mechanics, printed electronics, sensors, software application design, wireless connectivity, and documentation.
As illustrated in
Although a few variations have been described in detail above, other modifications or additions are possible. For example, design variations can include filter substrates of other geometries, e.g., rectangular, square or elliptical. Additionally, filter substrates, with varying topography, can include convex, concave and textured surfaces with micro or macro features. Also, target configurations including both circular targets and annular targets are contemplated. In embodiments, the modifications or additions can optimize cell deposition under the spray target.
The subject matter described herein provides many technical advantages. For example, single use avoids the need for sterilization of the system and greatly reduces the risk of cross contamination between patient samples, and enabling a simpler validation process. Also, single use enables temperature and humidity control within the bioreactor producing a healthier cell population. Another advantage is that it enables the delivery of multiple cargos through co-delivery through a single spray head or the ability to have multiple spray heads installed. Furthermore, the subject matter described herein is fast and simple, and the gentle cell processing maintains cell health and enables engineering of naïve cell populations. Temperature control of the filter substrate also enables better control of the delivery process and aid in recovery of cells from the system. The combination of the membrane holder design and nebulizer parameters enables optimization of the system for delivery of different cargos to different cell types.
Example Delivery Protocol
The invention is based on the surprising discovery that compounds or mixtures of compounds (compositions) are delivered into the cytoplasm of eukaryotic cells by contacting the cells with a solution containing a compound(s) to be delivered (e.g., payload) and an agent that reversibly permeates or dissolves a cell membrane. Preferably, the solution is delivered to the cells in the form of a spray, e.g., aqueous particles. (see, e.g., PCT/US2015/057247 and PCT/IB2016/001895, hereby incorporated in their entirety by reference). For example, the cells are coated with the spray but not soaked or submersed in the delivery compound-containing solution. Exemplary agents that permeate or dissolve a eukaryotic cell membrane include alcohols and detergents such as ethanol and Triton X-100, respectively. Other exemplary detergents, e.g., surfactants include polysorbate 20 (e.g., Tween 20), 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS), 3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonate (CHAPSO), sodium dodecyl sulfate (SDS), and octyl glucoside.
An example of conditions to achieve a coating of a population of coated cells include delivery of a fine particle spray, e.g., the conditions exclude dropping or pipetting a bolus volume of solution on the cells such that a substantial population of the cells are soaked or submerged by the volume of fluid. Thus, the mist or spray comprises a ratio of volume of fluid to cell volume. Alternatively, the conditions comprise a ratio of volume of mist or spray to exposed cell area, e.g., area of cell membrane that is exposed when the cells exist as a confluent or substantially confluent layer on a substantially flat surface such as the bottom of a tissue culture vessel, e.g., a well of a tissue culture plate, e.g., a microtiter tissue culture plate.
“Cargo” or “payload” are terms used to describe a compound, or composition that is delivered via an aqueous solution across a cell plasma membrane and into the interior of a cell.
In an aspect, delivering a payload across a plasma membrane of a cell includes providing a population of cells and contacting the population of cells with a volume of an aqueous solution. The aqueous solution includes the payload and an alcohol content greater than 2 percent concentration. The volume of the aqueous solution may be a function of exposed surface area of the population of cells, or may be a function of a number of cells in the population of cells.
In another aspect, a composition for delivering a payload across a plasma membrane of a cell includes an aqueous solution including the payload, an alcohol at greater than 2 percent concentration, greater than 46 mM salt, less than 121 mM sugar, and less than 19 mM buffering agent. For example, the alcohol, e.g., ethanol, concentration does not exceed 50%.
One or more of the following features can be included in any feasible combination. The volume of solution to be delivered to the cells is a plurality of units, e.g., a spray, e.g., a plurality of droplets on aqueous particles. The volume is described relative to an individual cell or relative to the exposed surface area of a confluent or substantially confluent (e.g., at least 75%, at least 80% confluent, e.g., 85%, 90%, 95%, 97%, 98%, 100%) cell population. For example, the volume can be between 6.0×10−7 microliter per cell and 7.4×10−4 microliter per cell. The volume is between 4.9×10−6 microliter per cell and 2.2×10−3 microliter per cell. The volume can be between 9.3×10−6 microliter per cell and 2.8×10−5 microliter per cell. The volume can be about 1.9×10−5 microliters per cell, and about is within 10 percent. The volume is between 6.0×10−7 microliter per cell and 2.2×10−3 microliter per cell. The volume can be between 2.6×10−9 microliter per square micrometer of exposed surface area and 1.1×10−6 microliter per square micrometer of exposed surface area. The volume can be between 5.3×10−8 microliter per square micrometer of exposed surface area and 1.6×10−7 microliter per square micrometer of exposed surface area. The volume can be about 1.1×10−7 microliter per square micrometer of exposed surface area. About can be within 10 percent.
Confluency of cells refers to cells in contact with one another on a surface. For example, it can be expressed as an estimated (or counted) percentage, e.g., 10% confluency means that 10% of the surface, e.g., of a tissue culture vessel, is covered with cells, 100% means that it is entirely covered. For example, adherent cells grow two dimensionally on the surface of a tissue culture well, plate or flask. Non-adherent cells can be spun down, pulled down by a vacuum, or tissue culture medium aspiration off the top of the cell population, or removed by aspiration or vacuum removal from the bottom of the vessel.
Contacting the population of cells with the volume of aqueous solution can be performed by gas propelling the aqueous solution to form a spray. The gas can include nitrogen, ambient air, or an inert gas. The spray can include discrete units of volume ranging in size from, 1 nm to 100 μm, e.g., 30-100 μm in diameter. The spray includes discrete units of volume with a diameter of about 30-50 μm. In some implementations, the spray includes discrete units of volume with a diameter of about 5-8 μm. A total volume of aqueous solution of 20 μl can be delivered in a spray to a cell-occupied area of about 1.9 cm2, e.g., one well of a 24-well culture plate. A total volume of aqueous solution of 10 μl is delivered to a cell-occupied area of about 0.95 cm2, e.g., one well of a 48-well culture plate. Typically, the aqueous solution includes a payload to be delivered across a cell membrane and into cell, and the second volume is a buffer or culture medium that does not contain the payload. Alternatively, the second volume (buffer or media) can also contain payload. In some embodiments, the aqueous solution includes a payload and an alcohol, and the second volume does not contain alcohol (and optionally does not contain payload). The population of cells can be in contact with said aqueous solution for 0.1 10 minutes prior to adding a second volume of buffer or culture medium to submerse or suspend said population of cells. The buffer or culture medium can be phosphate buffered saline (PBS). The population of cells can be in contact with the aqueous solution for 2 seconds to 5 minutes prior to adding a second volume of buffer or culture medium to submerse or suspend the population of cells. The population of cells can be in contact with the aqueous solution, e.g., containing the payload, for 30 seconds to 2 minutes prior to adding a second volume of buffer or culture medium, e.g., without the payload, to submerse or suspend the population of cells. The population of cells can be in contact with a spray for about 1-2 minutes prior to adding the second volume of buffer or culture medium to submerse or suspend the population of cells. During the time between spraying of cells and addition of buffer or culture medium, the cells remain hydrated by the layer of moisture from the spray volume.
The aqueous solution can include an ethanol concentration of 5 to 30%. The aqueous solution can include one or more of 75 to 98% H2O, 2 to 45% ethanol, 6 to 91 mM sucrose, 2 to 500 mM KCl, 2 to 35 mM ammonium acetate, and 1 to 14 mM (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) (HEPES). For example, the delivery solution contains 106 mM KCl and 25% ethanol.
The population of cells can include adherent cells or non-adherent cells. The adherent cells can include at least one of primary mesenchymal stem cells, fibroblasts, monocytes, macrophages, lung cells, neuronal cells, fibroblasts, human umbilical vein (HUVEC) cells, Chinese hamster ovary (CHO) cells, and human embryonic kidney (HEK) cells or immortalized cells, such as cell lines. The population of cells can also include cells that are adherent in a suspension culture. The cells that are adherent in a suspension culture can include human embryonic kidney (HEK) cells or macrophages. In preferred embodiments, the population of cells comprises non-adherent cells, e.g., the % non-adherent cells in the population is at least 50%, 60%, 75%, 80%, 90%, 95%, 98%, 99% or 100% non-adherent cells. Non-adherent cells primary cells as well as immortalized cells (e.g., cells of a cell line). Exemplary non-adherent/suspension cells include primary hematopoietic stem cell (HSC), T cells (e.g., CD3+ cells, CD4+ cells, CD8+ cells), natural killer (NK) cells, cytokine-induced killer (CIK) cells, human cord blood CD34+ cells, B cells, or cell lines such as Jurkat T cell line.
The payload can include a small chemical molecule, a peptide or protein, or a nucleic acid. The small chemical molecule can be less than 1,000 Da. The chemical molecule can include MitoTracker® Red CMXRos, propidium iodide, methotrexate, and/or DAPI (4′,6-diamidino-2-phenylindole). The peptide can be about 5,000 Da. The peptide can include ecallantide under trade name Kalbitor, is a 60 amino acid polypeptide for the treatment of hereditary angioedema and in prevention of blood loss in cardiothoracic surgery), Liraglutide (marketed as the brand name Victoza, is used for the treatment of type II diabetes, and Saxenda for the treatment of obesity), and Icatibant (trade name Firazyer, a peptidomimetic for the treatment of acute attacks of hereditary angioedema). The small-interfering ribonucleic acid (siRNA) molecule can be about 20-25 base pairs in length, or can be about 10,000-15,000 Da. The siRNA molecule can reduces the expression of any gene product, e.g., knockdown of gene expression of clinically relevant target genes or of model genes, e.g., glyceraldehyde-3phosphate dehydrogenase (GAPDH) siRNA, GAPDH siRNA-FITC, cyclophilin B siRNA, and/or lamin siRNA. Protein therapeutics can include peptides, enzymes, structural proteins, receptors, cellular proteins, or circulating proteins, or fragments thereof. The protein or polypeptide be about 100-500,000 Da, e.g., 1,000-150,000 Da. The protein can include any therapeutic, diagnostic, or research protein or peptide, e.g., beta-lactoglobulin, ovalbumin, bovine serum albumin (BSA), and/or horseradish peroxidase. In other examples, the protein can include a cancer-specific apoptotic protein, e.g., Tumor necrosis factor-related apoptosis inducing protein (TRAIL).
An antibody is generally be about 150,000 Da in molecular mass. The antibody can include an anti-actin antibody, an anti-GAPDH antibody, an anti-Src antibody, an anti-Myc ab, and/or an anti-Raf antibody. The antibody can include a green fluorescent protein (GFP) plasmid, a GLuc plasmid and, and a BATEM plasmid. The DNA molecule can be greater than 5,000,000 Da. In some examples, the antibody can be a murine-derived monoclonal antibody, e.g., ibritumomab tiuxetin, muromomab-CD3, tositumomab, a human antibody, or a humanized mouse (or other species of origin) antibody. In other examples, the antibody can be a chimeric monoclonal antibody, e.g., abciximab, basiliximab, cetuximab, infliximab, or rituximab. In still other examples, the antibody can be a humanized monoclonal antibody, e.g., alemtuzamab, bevacizumab, certolizumab pegol, daclizumab, gentuzumab ozogamicin, trastuzumab, tocilizumab, ipilimumamb, or panitumumab. The antibody can comprise an antibody fragment, e.g., abatecept, aflibercept, alefacept, or etanercept. The invention encompasses not only an intact monoclonal antibody, but also an immunologically-active antibody fragment, e.g., a Fab or (Fab)2 fragment; an engineered single chain Fv molecule; or a chimeric molecule, e.g., an antibody which contains the binding specificity of one antibody, e.g., of murine origin, and the remaining portions of another antibody, e.g., of human origin.
The payload can include a therapeutic agent. A therapeutic agent, e.g., a drug, or an active agent”, can mean any compound useful for therapeutic or diagnostic purposes, the term can be understood to mean any compound that is administered to a patient for the treatment of a condition. Accordingly, a therapeutic agent can include, proteins, peptides, antibodies, antibody fragments, and small molecules. Therapeutic agents described in U.S. Pat. No. 7,667,004 (incorporated herein by reference) can be used in the methods described herein. The therapeutic agent can include at least one of cisplatin, aspirin, statins (e.g., pitavastatin, atorvastatin, lovastatin, pravastatin, rosuvastatin, simvastatin, promazine HCl, chloropromazine HCl, thioridazine HCl, Polymyxin B sulfate, chloroxine, benfluorex HCl and phenazopyridine HCl), and fluoxetine. The payload can include a diagnostic agent. The diagnostic agent can include a detectable label or marker such as at least one of methylene blue, patent blue V, and indocyanine green. The payload can include a fluorescent molecule. The payload can include a detectable nanoparticle. The nanoparticle can include a quantum dot.
The population of non-adherent cells can be substantially confluent, such as greater than 75 percent confluent. Confluency of cells refers to cells in contact with one another on a surface. For example, it can be expressed as an estimated (or counted) percentage, e.g., 10% confluency means that 10% of the surface, e.g., of a tissue culture vessel, is covered with cells, 100% means that it is entirely covered. For example, adherent cells grow two dimensionally on the surface of a tissue culture well, plate or flask. Non-adherent cells can be spun down, pulled down by a vacuum, or tissue culture medium aspiration off the top of the cell population, or removed by aspiration or vacuum removal from the bottom of the vessel. The population of cells can form a monolayer of cells.
The alcohol can be selected from methanol, ethanol, isopropyl alcohol, butanol and benzyl alcohol. The salt can be selected from NaCl, KCl, Na2HPO4, KH2PO4, and C2H3O2NH. In preferred embodiments, the salt is KCl. The sugar can include sucrose. The buffering agent can include 4-2-(hydroxyethyl)-1-piperazineethanesulfonic acid.
The present subject matter relates to a method for delivering molecules across a plasma membrane. The present subject matter finds utility in the field of intra-cellular delivery, and has application in, for example, delivery of molecular biological and pharmacological therapeutic agents to a target site, such as a cell, tissue, or organ. The method of the present subject matter comprises introducing the molecule to an aqueous composition to form a matrix; atomizing the matrix into a spray; and contacting the matrix with a plasma membrane.
This present subject matter relates to a composition for use in delivering molecules across a plasma membrane. The present subject matter finds utility in the field of intra-cellular delivery, and has application in, for example, delivery of molecular biological and pharmacological therapeutic agents to a target site, such as a cell, tissue, or organ. The composition of the present subject matter comprises an alcohol; a salt; a sugar; and/or a buffering agent.
In some implementations, demonstrated is a permeabilisation technique that facilitates intracellular delivery of molecules independent of the molecule and cell type. Nanoparticles, small molecules, nucleic acids, proteins and other molecules can be efficiently delivered into suspension cells or adherent cells in situ, including primary cells and stem cells, with low cell toxicity and the technique is compatible with high throughput and automated cell-based assays.
The example methods described herein include a payload, wherein the payload includes an alcohol. By the term “an alcohol” is meant a polyatomic organic compound including a hydroxyl (—OH) functional group attached to at least one carbon atom. The alcohol may be a monohydric alcohol and may include at least one carbon atom, for example methanol. The alcohol may include at least two carbon atoms (e.g. ethanol). In other aspects, the alcohol comprises at least three carbons (e.g. isopropyl alcohol). The alcohol may include at least four carbon atoms (e.g., butanol), or at least seven carbon atoms (e.g., benzyl alcohol). The example payload may include no more than 50% (v/v) of the alcohol, more preferably, the payload comprises 2-45% (v/v) of the alcohol, 5-40% of the alcohol, and 10-40% of the alcohol. The payload may include 20-30% (v/v) of the alcohol.
Most preferably, the payload delivery solution includes 25% (v/v) of the alcohol. Alternatively, the payload can include 2-8% (v/v) of the alcohol, or 2% of the alcohol. The alcohol may include ethanol and the payload comprises 5, 10, 20, 25, 30, and up to 40% or 50% (v/v) of ethanol, e.g., 27%. Example methods may include methanol as the alcohol, and the payload may include 5, 10, 20, 25, 30, or 40% (v/v) of the methanol. The payload may include 2-45% (v/v) of methanol, 20-30% (v/v), or 25% (v/v) methanol. Preferably, the payload includes 20-30% (v/v) of methanol. Further alternatively, the alcohol is butanol and the payload comprises 2, 4, or 8% (v/v) of the butanol.
In some aspects of the present subject matter, the payload is in a solution or buffer.
According to the present subject matter, the payload may include at least one salt. The salt may be selected from NaCl, KCl, Na2HPO4, C2H3O2NH4 and KH2PO4. For example, KCl concentration ranges from 2 mM to 500 mM. In some preferred embodiments, the concentration is greater than 100 mM, e.g., 106 mM.
According to example methods of the present subject matter, the payload may include a sugar (e.g., a sucrose, or a disaccharide). According to example methods, the payload comprises less than 121 mM sugar, 6-91 mM, or 26-39 mM sugar. Still further, the payload includes 32 mM sugar (e.g., sucrose). Optionally, the sugar is sucrose and the payload comprises 6.4, 12.8, 19.2, 25.6, 32, 64, 76.8, or 89.6 mM sucrose.
According to example methods of the present subject matter, the payload may include a buffering agent (e.g. a weak acid or a weak base). The buffering agent may include a zwitterion. According to example methods, the buffering agent is 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid. The payload may comprise less than 19 mM buffering agent (e.g., 1-15 mM, or 4-6 mM or 5 mM buffering agent). According to example methods, the buffering agent is 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid and the payload comprises 1, 2, 3, 4, 5, 10, 12, 14 mM 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid. Further preferably, the payload comprises 5 mM 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid.
According to example methods of the present subject matter, the payload includes ammonium acetate. The payload may include less than 46 mM ammonium acetate (e.g., between 2-35 mM, 10-15 mM, or 25 mM ammonium acetate). The payload may include 2.4, 4.8, 7.2, 9.6, 12, 24, 28.8, or 33.6 mM ammonium acetate.
The volume of aqueous solution performed by gas propelling the aqueous solution may include compressed air (e.g. ambient air), other implementations may include inert gases, for example, helium, neon, and argon.
In certain aspects of the present subject matter, the population of cells may include adherent cells (e.g., lung, kidney, immune cells such as macrophages) or non-adherent cells (e.g., suspension cells).
In certain aspects of the present subject matter, the population of cells may be substantially confluent, and substantially may include greater than 75 percent confluent. In preferred implementations, the population of cells may form a single monolayer.
According to example methods, the payload to be delivered has an average molecular weight of up to 20,000,000 Da. In some examples, the payload to be delivered can have an average molecular weight of up to 2,000,000 Da. In some implementations, the payload to be delivered may have an average molecular weight of up to 150,000 Da. In further implementations, the payload to be delivered has an average molecular weight of up to 15,000 Da, 5,000 Da or 1,000 Da.
The payload to be delivered across the plasma membrane of a cell may include a small chemical molecule, a peptide or protein, a polysaccharide or a nucleic acid or a nanoparticle. A small chemical molecule may be less than 1,000 Da, peptides may have molecular weights about 5,000 Da, siRNA may have molecular weights around 15,000 Da, antibodies may have molecular weights of about 150,000 Da and DNA may have molecular weights of greater than or equal to 5,000,000 Da. In preferred embodiments, the payload comprises mRNA.
According to example methods, the payload includes 3.0-150.0 μM of a molecule to be delivered, more preferably, 6.6-150.0 μM molecule to be delivered (e.g. 3.0, 3.3, 6.6, or 150.0 μM molecule to be delivered). In some implementations, the payload to be delivered has an average molecular weight of up to 15,000 Da, and the payload includes 3.3 μM molecules to be delivered.
According to example methods, the payload to be delivered has an average molecular weight of up to 15,000 Da, and the payload includes 6.6 μM to be delivered. In some implementations, the payload to be delivered has an average molecular weight of up to 1,000 Da, and the payload includes 150.0 μM to be delivered.
According to further aspects of the present subject matter, a method for delivering molecules of more than one molecular weight across a plasma membrane is provided; the method including the steps of: introducing the molecules of more than one molecular weight to an aqueous solution; and contacting the aqueous solution with a plasma membrane.
In some implementations, the method includes introducing a first molecule having a first molecular weight and a second molecule having a second molecular weight to the payload, wherein the first and second molecules may have different molecular weights, or wherein, the first and second molecules may have the same molecular weights. According to example methods, the first and second molecules may be different molecules.
In some implementations, the payload to be delivered may include a therapeutic agent, or a diagnostic agent, including, for example, cisplatin, aspirin, various statins (e.g., pitavastatin, atorvastatin, lovastatin, pravastatin, rosuvastatin, simvastatin, promazine HCl, chloropromazine HCl, thioridazine HCl, Polymyxin B sulfate, chloroxine, benfluorex HCl and phenazopyridine HCl), and fluoxetine. Other therapeutic agents include antimicrobials (aminoclyclosides (e.g. gentamicin, neomycin, streptomycin), penicillins (e.g., amoxicillin, ampicillin), glycopeptides (e.g., avoparcin, vancomycin), macrolides (e.g., erythromycin, tilmicosin, tylosin), quinolones (e.g., sarafloxacin, enrofloxin), streptogramins (e.g., viginiamycin, quinupristin-dalfoprisitin), carbapenems, lipopeptides, oxazolidinones, cycloserine, ethambutol, ethionamide, isoniazrid, para-aminosalicyclic acid, and pyrazinamide). In some examples, an anti-viral (e.g., Abacavir, Aciclovir, Enfuvirtide, Entecavir, Nelfinavir, Nevirapine, Nexavir, Oseltamivir Raltegravir, Ritonavir, Stavudine, and Valaciclovir). The therapeutic may include a protein-based therapy for the treatment of various diseases, e.g., cancer, infectious diseases, hemophilia, anemia, multiple sclerosis, and hepatitis B or C.
Additional exemplary payloads can also include detectable markers or labels such as methylene blue, Patent blue V, and Indocyanine green.
The methods described herein may also include the payload including of a detectable moiety, or a detectable nanoparticle (e.g., a quantum dot). The detectable moiety may include a fluorescent molecule or a radioactive agent (e.g., 125I). When the fluorescent molecule is exposed to light of the proper wave length, its presence can then be detected due to fluorescence. Among the most commonly used fluorescent labeling compounds are fluorescein isothiocyanate, rhodamine, phycoerythrin, phycocyanin, allophycocyanin, p-phthaldehyde and fluorescamine. The molecule can also be detectably labeled using fluorescence emitting metals such as 152Eu, or others of the lanthanide series. These metals can be attached to the molecule using such metal chelating groups as diethylenetriaminepentacetic acid (DTPA) or ethylenediaminetetraacetic acid (EDTA). The molecule also can be detectably labeled by coupling it to a chemiluminescent compound. The presence of the chemiluminescent-tagged molecule is then determined by detecting the presence of luminescence that arises during the course of chemical reaction. Examples of particularly useful chemiluminescent labeling compounds are luminol, isoluminol, theromatic acridinium ester, imidazole, acridinium salt and oxalate ester.
In additional embodiments, the payload to be delivered may include a composition that edits genomic DNA (i.e., gene editing tools). For example, the gene editing composition may include a compound or complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA. Alternatively or in addition, a gene editing composition may include a compound that (i) may be included a gene-editing complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA; or (ii) may be processed or altered to be a compound that is included in a gene-editing complex that cleaves, nicks, splices, rearranges, translocates, recombines, or otherwise alters genomic DNA. In various embodiments, the gene editing composition comprises one or more of (a) gene editing protein; (b) RNA molecule; and/or (c) ribonucleoprotein (RNP).
In some embodiments, the gene editing composition comprises a gene editing protein, and the gene editing protein is a zinc finger nuclease (ZFN), a transcription activator-like effector nuclease (TALEN), a Cas protein, a Cre recombinase, a Hin recombinase, or a Flp recombinase. In additional embodiments, the gene editing protein may be a fusion proteins that combine homing endonucleases with the modular DNA binding domains of TALENs (megaTAL). For example, megaTAL may be delivered as a protein or alternatively, a mRNA encoding a megaTAL protein is delivered to the cells.
In various embodiments, the gene editing composition comprises a RNA molecule, and the RNA molecule comprises a sgRNA, a crRNA, and/or a tracrRNA.
In certain embodiments, the gene editing composition comprises a RNP, and the RNP comprises a Cas protein and a sgRNA or a crRNA and a tracrRNA. Aspects of the present subject matter are particularly useful for controlling when and for how long a particular gene-editing compound is present in a cell.
In various implementations of the present subject matter, the gene editing composition is detectable in a population of cells, or the progeny thereof, for (a) about 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 24, 48, 60, 72, 0.5-2, 0.5-6, 6-12 or 0.5-72 hours after the population of cells is contacted with the aqueous solution, or (b) less than about 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 24, 48, 60, 72, 0.5-2, 0.5-6, 6-12 or 0.5-72 hours after the population of cells is contacted with the aqueous solution.
In some embodiments, the genome of cells in the population of cells, or the progeny thereof, comprises at least one site-specific recombination site for the Cre recombinase, Hin recombinase, or Flp recombinase.
Aspects of the present invention relate to cells that comprise one gene editing compound, and inserting another gene editing compound into the cells. For example, one component of an RNP could be introduced into cells that express or otherwise already contain another component of the RNP. For example, cells in a population of cells, or the progeny thereof, may comprise a sgRNA, a crRNA, and/or a tracrRNA. In some embodiments the population of cells, or the progeny thereof, expresses the sgRNA, crRNA, and/or tracrRNA. Alternatively or in addition, cells in a population of cells, or the progeny thereof, express a Cas protein.
Various implementations of the subject matter herein include a Cas protein. In some embodiments, the Cas protein is a Cas9 protein or a mutant thereof. Exemplary Cas proteins (including Cas9 and non-limiting examples of Cas9 mutants) are described herein.
In various aspects, the concentration of Cas9 protein may range from about 0.1 to about 25 μg. For example, the concentration of Cas9 may be about 1 μg, about 5 μg, about 10 μg, about 15 μg, or about 20 μg. Alternatively, the concentration of Cas9 may range from about 10 ng/μL to about 300 ng/μL; for example from about 10 ng/μL to about 200 ng/μl; or from about 10 ng/μL to about 100 ng/μl, or from about 10 ng/μL to about 50 ng/μl.
In certain embodiments, the gene editing composition comprises (a) a first sgRNA molecule and a second sgRNA molecule, wherein the nucleic acid sequence of the first sgRNA molecule is different from the nucleic acid sequence of the second sgRNA molecule; (b) a first RNP comprising a first sgRNA and a second RNP comprising a second sgRNA, wherein the nucleic acid sequence of the first sgRNA molecule is different from the nucleic acid sequence of the second sgRNA molecule; (c) a first crRNA molecule and a second crRNA molecule, wherein the nucleic acid sequence of the first crRNA molecule is different from the nucleic acid sequence of the second crRNA molecule; (d) a first crRNA molecule and a second crRNA molecule, wherein the nucleic acid sequence of the first crRNA molecule is different from the nucleic acid sequence of the second crRNA molecule, and further comprising a tracrRNA molecule; or (e) a first RNP comprising a first crRNA and a tracrRNA and a second RNP comprising a second crRNA and a tracrRNA, wherein the nucleic acid sequence of the first crRNA molecule is different from the nucleic acid sequence of the second crRNA molecule.
In aspects, the ratio of the Cas9 protein to guide RNA may be 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, or 1:10.
In embodiments, increasing the number of times that cells go through the delivery process (alternatively, increasing the number of doses), may increase the percentage edit; wherein, in some embodiments the number of doses may include 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 doses.
In various embodiments, the first and second sgRNA or first and second crRNA molecules together comprise nucleic acid sequences complementary to target sequences flanking a gene, an exon, an intron, an extrachromosomal sequence, or a genomic nucleic acid sequence, wherein the gene, an exon, intron, extrachromosomal sequence, or genomic nucleic acid sequence is about 1, 2, 3, 4, 5, 6, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 1-100, kilobases in length or is at least about 1, 2, 3, 4, 5, 6, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 1-100, kilobases in length. In some embodiments, the use of pairs of RNPs comprising the first and second sgRNA or first and second crRNA molecules may be used to create a polynucleotide molecule comprising the gene, exon, intron, extrachromosomal sequence, or genomic nucleic acid sequence.
In certain embodiments, the target sequence of a sgRNA or crRNA is about 12 to about 25, or about 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 17-23, or 18-22, nucleotides long. In some embodiments, the target sequence is 20 nucleotides long or about 20 nucleotides long.
In various embodiments, the first and second sgRNA or first and second crRNA molecules are complementary to sequences flanking an extrachromosomal sequence that is within an expression vector.
Aspects of the present subject matter relate to the delivery of multiple components of a gene-editing complex, where the multiple components are not complexed together. In some embodiments, gene editing composition comprises at least one gene editing protein and at least one nucleic acid, wherein the gene editing protein and the nucleic acid are not bound to or complexed with each other.
The present subject matter allows for high gene editing efficiency while maintaining high cell viability. In some embodiments, at least about 10, 20, 30, 40, 50, 60, 70, 80, 90, 95, 99%, 1-99%, or more of the population of cells, or the progeny thereof, become genetically modified after contact with the aqueous solution. In various embodiments, at least about 10, 20, 30, 40, 50, 60, 70, 80, 90, 95, 99%, 1-99%, or more of the population of cells, or the progeny thereof, are viable after contact with the aqueous solution.
In certain embodiments, the gene editing composition induces single-strand or double-strand breaks in DNA within the cells. In some embodiments the gene editing composition further comprises a repair template polynucleotide. In various embodiments, the repair template comprises (a) a first flanking region comprising nucleotides in a sequence complementary to about 40 to about 90 base pairs on one side of the single or double strand break and a second flanking region comprising nucleotides in a sequence complementary to about 40 to about 90 base pairs on the other side of the single or double strand break; or (b) a first flanking region comprising nucleotides in a sequence complementary to at least about 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, or 90 base pairs on one side of the single or double strand break and a second flanking region comprising nucleotides in a sequence complementary to at least about 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, or 90 base pairs on the other side of the single or double strand break. Non-limiting descriptions relating to gene editing (including repair templates) using the CRISPR-Cas system are discussed in Ran et al. (2013) Nat Protoc. 2013 November; 8(11): 2281-2308, the entire content of which is incorporated herein by reference. Embodiments involving repair templates are not limited to those comprising the CRISPR-Cas system.
In various implementations of the present subject matter, the volume of aqueous solution is delivered to the population of cells in the form of a spray. In some embodiments, the volume is between 6.0×10−7 microliter per cell and 7.4×10−4 microliter per cell. In certain embodiments, the spray comprises a colloidal or sub-particle comprising a diameter of 10 nm to 100 μm. In various embodiments, the volume is between 2.6×10−9 microliter per square micrometer of exposed surface area and 1.1×10−6 microliter per square micrometer of exposed surface area.
In some embodiments, the RNP has a size of approximately 100 Å×100 Å×50 Å or 10 nm×10 nm×5 nm. In various embodiments, the size of spray particles is adjusted to accommodate at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more RNPs per spray particle.
For example, contacting the population of cells with the volume of aqueous solution may be performed by gas propelling the aqueous solution to form a spray. In certain embodiments, the population of cells is in contact with said aqueous solution for 0.01-10 minutes (e.g., 0.1-10 minutes) prior to adding a second volume of buffer or culture medium to submerse or suspend said population of cells.
In various embodiments, the population of cells includes at least one of primary or immortalized cells. For example, the population of cells may include mesenchymal stem cells, lung cells, neuronal cells, fibroblasts, human umbilical vein (HUVEC) cells, and human embryonic kidney (HEK) cells, primary or immortalized hematopoietic stem cell (HSC), T cells, natural killer (NK) cells, cytokine-induced killer (CIK) cells, human cord blood CD34+ cells, B cells. Non limiting examples of T cells may include CD8+ or CD4+ T cells. In some aspects, the CD8+ subpopulation of the CD3 T cells are used. CD8+ T cells may be purified from the PBMC population by positive isolation using anti-CD8 beads. In some aspects primary NK cells are isolated from PBMCs and GFP mRNA may be delivered by platform delivery technology (i.e., 3% expression and 96% viability at 24 hours). In additional aspects, NK cell lines, e.g., NK92 may be used.
Cell types also include cells that have previously been modified for example T cells, NK cells and MSC to enhance their therapeutic efficacy. For example: T cells or NK cells that express chimeric antigen receptors (CAR T cells, CAR NK cells, respectively); T cells that express modified T cell receptor (TCR); MSC that are modified virally or non-virally to overexpress therapeutic proteins that complement their innate properties (e.g. delivery of Epo using lentiviral vectors or BMP-2 using AAV-6) (reviewed in Park et al, Methods, 2015 August; 84-16.); MSC that are primed with non-peptidic drugs or magnetic nanoparticles for enhanced efficacy and externally regulated targeting respectively (Park et al., 2015); MSC that are functionalised with targeting moieties to augment their homing toward therapeutic sites using enzymatic modification (e.g. Fucosyltransferase), chemical conjugation (eg. modification of SLeX on MSC by using N-hydroxy-succinimide (NHS) chemistry) or non-covalent interactions (eg. engineering the cell surface with palmitated proteins which act as hydrophobic anchors for subsequent conjugation of antibodies) (Park et al., 2015). For example, T cells, e.g., primary T cells or T cell lines, that have been modified to express chimeric antigen receptors (CAR T cells) may further be treated according to the invention with gene editing proteins and or complexes containing guide nucleic acids specific for the CAR encoding sequences for the purpose of editing the gene(s) encoding the CAR, thereby reducing or stopping the expression of the CAR in the modified T cells.
Aspects of the present invention relate to the expression vector-free delivery of gene editing compounds and complexes to cells and tissues, such as delivery of Cas-gRNA ribonucleoproteins for genome editing in primary human T cells, hematopoietic stem cells (HSC), and mesenchymal stromal cells (MSC). In some example, mRNA encoding such proteins are delivered to the cells.
Various aspects of the CRISPR-Cas system are known in the art. Non-limiting aspects of this system are described, e.g., in U.S. Pat. No. 9,023,649, issued May 5, 2015; U.S. Pat. No. 9,074,199, issued Jul. 7, 2015; U.S. Pat. No. 8,697,359, issued Apr. 15, 2014; U.S. Pat. No. 8,932,814, issued Jan. 13, 2015; PCT International Patent Application Publication No. WO 2015/071474, published Aug. 27, 2015; Cho et al., (2013) Nature Biotechnology Vol 31 No 3 pp 230-232 (including supplementary information); and Jinek et al., (2012) Science Vol 337 No 6096 pp 816-821, the entire contents of each of which are incorporated herein by reference.
Non-limiting examples of Cas proteins include Cas1, Cas1B, Cas2, Cas3, Cas4, Cas5, Cas6, Cas7, Cas8, Cas9 (also known as Csn1 and Csx12), Cas10, Csy1, Csy2, Csy3, Cse1, Cse2, Csc1, Csc2, Csa5, Csn2, Csm2, Csm3, Csm4, Csm5, Csm6, Cmr1, Cmr3, Cmr4, Cmr5, Cmr6, Csb1, Csb2, Csb3, Csx17, Csx14, Csx10, Csx16, CsaX, Csx3, Csx1, Csx15, Csf1, Csf2, Csf3, Csf4, homologs thereof, or modified versions thereof. These enzymes are known; for example, the amino acid sequence of S. pyogenes Cas9 protein may be found in the SwissProt database under accession number Q99ZW2 and in the NCBI database as under accession number Q99ZW2.1. UniProt database accession numbers A0A0G4DEU5 and CDJ55032 provide another example of a Cas9 protein amino acid sequence. Another non-limiting example is a Streptococcus thermophilus Cas9 protein, the amino acid sequence of which may be found in the UniProt database under accession number Q03JI6.1. In some embodiments, the unmodified CRISPR enzyme has DNA cleavage activity, such as Cas9. In certain embodiments the CRISPR enzyme is Cas9, and may be Cas9 from S. pyogenes or S. pneunoniae. In various embodiments, the CRISPR enzyme directs cleavage of one or both strands at the location of a target sequence, such as within the target sequence and/or within the complement of the target sequence. In some embodiments, the CRISPR enzyme directs cleavage of one or both strands within about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 50, 100, 200, 500, or more base pairs from the first or last nucleotide of a target sequence. In some embodiments, a vector encodes a CRISPR enzyme that is mutated to with respect to a corresponding wild-type enzyme such that the mutated CRISPR enzyme lacks the ability to cleave one or both strands of a target polynucleotide containing a target sequence. For example, an aspartate-to-alanine substitution in the RuvC I catalytic domain of Cas9 from S. pyogenes converts Cas9 from a nuclease that cleaves both strands to a nickase (cleaves a single strand). Other examples of mutations that render Cas9 a nickase include, without limitation, H840A, N854A, and N863A. In aspects of the invention, nickases may be used for genome editing via homologous recombination.
In certain embodiments, a Cas9 nickase may be used in combination with guide sequence(s), e.g., two guide sequences, which target respectively sense and antisense strands of the DNA target. This combination allows both strands to be nicked and used to induce NHEJ.
As a further example, two or more catalytic domains of Cas9 (RuvC I, RuvC II, and RuvC III) may be mutated to produce a mutated Cas9 substantially lacking all DNA cleavage activity. A D10A mutation may be combined with one or more of H840A, N854A, or N863A mutations to produce a Cas9 enzyme substantially lacking all DNA cleavage activity. In certain embodiments, a CRISPR enzyme is considered to substantially lack all DNA cleavage activity when the DNA cleavage activity of the mutated enzyme is less than about 25%, 10%, 5%, 1%, 0.1%, 0.01%, or lower with respect to its non-mutated form. Other mutations may be useful; where the Cas9 or other CRISPR enzyme is from a species other than S. pyogenes, mutations in corresponding amino acids may be made to achieve similar effects.
In certain embodiments, a protein being delivered (such as a Cas protein or a variant thereof) may include a subcellular localization signal. For example, the Cas protein within a RNP may comprise a subcellular localization signal. Depending on context, a fusion protein comprising. e.g., Cas9 and a nuclear localization signal may be referred to as “Cas9” herein without specifying the inclusion of the nuclear localization signal. In some embodiments, the payload (such as an RNP) comprises a fusion-protein that comprises a localization signal. For example, the fusion-protein may contain a nuclear localization signal, a nucleolar localization signal, or a mitochondrial targeting signal. Such signals are known in the art, and non-limiting examples are described in Kalderon et al., (1984) Cell 39 (3 Pt 2): 499-509; Makkerh et al., (1996) Curr Biol. 6 (8):1025-7; Dingwall et al., (1991) Trends in Biochemical Sciences 16 (12): 478-81; Scott et al., (2011) BMC Bioinformatics 12:317 (7 pages); Omura T (1998) J Biochem. 123(6):1010-6; Rapaport D (2003) EMBO Rep. 4(10):948-52; and Brocard & Hartig (2006) Biochimica et Biophysica Acta (BBA)—Molecular Cell Research 1763(12):1565-1573, the contents of each of which are hereby incorporated herein by reference. In various embodiments, the Cas protein may comprise more than one localization signals, such as 2, 3, 4, 5, or more nuclear localization signals. In some embodiments, the localization signal is at the N-terminal end of the Cas protein and in other embodiments the localization signal is at the C-terminal end of the Cas protein.
In some embodiments, an enzyme coding sequence encoding a CRISPR enzyme is codon optimized for expression in particular cells, such as eukaryotic cells. The eukaryotic cells may be those of or derived from a particular organism, such as a mammal, including but not limited to human, mouse, rat, rabbit, dog, or non-human primate. In general, codon optimization refers to a process of modifying a nucleic acid sequence for enhanced expression in the host cells of interest by replacing at least one codon (e.g. about or more than about 1, 2, 3, 4, 5, 10, 15, 20, 25, 50, or more codons) of the native sequence with codons that are more frequently or most frequently used in the genes of that host cell while maintaining the native amino acid sequence. Various species exhibit particular bias for certain codons of a particular amino acid. Codon bias (differences in codon usage between organisms) often correlates with the efficiency of translation of messenger RNA (mRNA), which is in turn believed to be dependent on, among other things, the properties of the codons being translated and the availability of particular transfer RNA (tRNA) molecules. The predominance of selected tRNAs in a cell is generally a reflection of the codons used most frequently in peptide synthesis.
Accordingly, genes can be tailored for optimal gene expression in a given organism based on codon optimization. Codon usage tables are readily available, for example, at the “Codon Usage Database”, and these tables can be adapted in a number of ways. See Nakamura, Y., et al. “Codon usage tabulated from the international DNA sequence databases: status for the year 2000” Nucl. Acids Res. 28:292 (2000). Computer algorithms for codon optimizing a particular sequence for expression in a particular host cell are also available, such as Gene Forge (Aptagen; Jacobus, Pa.), are also available. In some embodiments, one or more codons (e.g. 1, 2, 3, 4, 5, 10, 15, 20, 25, 50, or more, or all codons) in a sequence encoding a CRISPR enzyme corresponding to the most frequently used codon for a particular amino acid.
In general, a guide sequence is any polynucleotide sequence having sufficient complementarity with a target polynucleotide sequence to hybridize with the target sequence and direct sequence-specific binding of a CRISPR complex to the target sequence. In some embodiments, the degree of complementarity between a guide sequence and its corresponding target sequence, when optimally aligned using a suitable alignment algorithm, is about or more than about 50%, 60%, 75%, 80%, 85%, 90%, 95%, 97.5%, 99%, or more. In some embodiments, the degree of complementarity is 100%. Optimal alignment may be determined with the use of any suitable algorithm for aligning sequences, non-limiting example of which include the Smith-Waterman algorithm, the Needleman-Wunsch algorithm, algorithms based on the Burrows-Wheeler Transform (e.g. the Burrows Wheeler Aligner), ClustalW, Clustal X, BLAT, Novoalign (Novocraft Technologies, ELAND (Illumina, San Diego, Calif.), SOAP (available at soap.genomics.org.cn), and Maq (available at maq.sourceforge.net). In some embodiments, a guide sequence is about or more than about 5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 35, 40, 45, 50, 75, or more nucleotides in length. In certain embodiments, a guide sequence is less than about 75, 50, 45, 40, 35, 30, 25, 20, 15, 12, or fewer nucleotides in length. The ability of a guide sequence to direct sequence-specific binding of a CRISPR complex to a target sequence may be assessed by any suitable assay. For example, the components of a CRISPR system sufficient to form a CRISPR complex, including the guide sequence to be tested, may be provided to a host cell having the corresponding target sequence, such as by transfection with vectors encoding the components of the CRISPR sequence, followed by an assessment of preferential cleavage within the target sequence, such as by Surveyor assay as described herein. Similarly, cleavage of a target polynucleotide sequence may be evaluated in a test tube by providing the target sequence, components of a CRISPR complex, including the guide sequence to be tested and a control guide sequence different from the test guide sequence, and comparing binding or rate of cleavage at the target sequence between the test and control guide sequence reactions.
CRISPR-Cas technology which facilitates genome engineering in a wide range of cell types is evolving rapidly. It has recently been shown that delivery of the Cas9-gRNA editing tools in the form of ribonucleoproteins (RNPs) yields several benefits compared with delivery of plasmids encoding for Cas9 and gRNAs. Benefits include faster and more efficient editing, fewer off-target effects, and less toxicity. RNPs have been delivered by lipofection and electroporation but limitations that remain with these delivery methods, particularly for certain clinically relevant cell types, include toxicity and low efficiency. Accordingly, there is a need to provide a vector-free e.g., viral vector-free, approach for delivering biologically relevant payloads, e.g., RNPs, across a plasma membrane and into cells. “Cargo” or “payload” are terms used to describe a compound, or composition that is delivered via an aqueous solution across a cell plasma membrane and into the interior of a cell.
The current subject matter relates to delivery technology that facilitates delivery of a broad range of payloads to cells with low toxicity. Genome editing may be achieved by delivering RNPs to cells using some aspects of the current subject matter. Levels decline thereafter until Cas9 is no longer detectable. The delivery technology per se does not deleteriously affect the viability or functionality of Jurkat and primary T cells. The current subject matter enables gene editing via Cas9 RNPs in clinically relevant cell types with minimal toxicity.
The transient and direct delivery of CRISPR/Cas components such as Cas and/or a gRNA has advantages compared to expression vector-mediated delivery. For example, an amount of Cas, gRNA, or RNP can be added with more precise timing and for a limited amount of time compared to the use of an expression vector. Components expressed from a vector may be produced in various quantities and for variable amounts of time, making it difficult to achieve consistent gene editing without off-target edits. Additionally, pre-formed complexes of Cas and gRNAs (RNPs) cannot be delivered with expression vectors.
In one aspect, the present subject matter describes cells attached to a solid support, (e.g., a strip, a polymer, a bead, or a nanoparticle). The support or scaffold may be a porous or non-porous solid support. Well-known supports or carriers include glass, polystyrene, polypropylene, polyethylene, dextran, nylon, amylases, natural and modified celluloses, polyacrylamides, gabbros, and magnetite. The nature of the carrier can be either soluble to some extent or insoluble for the purposes of the present subject matter. The support material may have virtually any possible structural configuration. Thus, the support configuration may be spherical, as in a bead, or cylindrical, as in the inside surface of a test tube, or the external surface of a rod. Alternatively, the surface may be flat such as a sheet, or test strip, etc. Preferred supports include polystyrene beads.
In other aspects, the solid support comprises a polymer, to which cells are chemically bound, immobilized, dispersed, or associated. A polymer support may be a network of polymers, and may be prepared in bead form (e.g., by suspension polymerization). The cells on such a scaffold can be sprayed with payload containing aqueous solution according to the invention to deliver desired compounds to the cytoplasm of the scaffold. Exemplary scaffolds include stents and other implantable medical devices or structures.
In the descriptions above and in the claims, phrases such as “at least one of” or “one or more of” may occur followed by a conjunctive list of elements or features. The term “and/or” may also occur in a list of two or more elements or features. Unless otherwise implicitly or explicitly contradicted by the context in which it is used, such a phrase is intended to mean any of the listed elements or features individually or any of the recited elements or features in combination with any of the other recited elements or features. For example, the phrases “at least one of A and B;” “one or more of A and B;” and “A and/or B” are each intended to mean “A alone, B alone, or A and B together.” A similar interpretation is also intended for lists including three or more items. For example, the phrases “at least one of A, B, and C;” “one or more of A, B, and C;” and “A, B, and/or C” are each intended to mean “A alone, B alone, C alone, A and B together, A and C together, B and C together, or A and B and C together.” In addition, use of the term “based on,” above and in the claims is intended to mean, “based at least in part on,” such that an unrecited feature or element is also permissible.
The subject matter described herein can be embodied in systems, apparatus, methods, and/or articles depending on the desired configuration. The implementations set forth in the foregoing description do not represent all implementations consistent with the subject matter described herein. Instead, they are merely some examples consistent with aspects related to the described subject matter. Although a few variations have been described in detail above, other modifications or additions are possible. In particular, further features and/or variations can be provided in addition to those set forth herein. For example, the implementations described above can be directed to various combinations and subcombinations of the disclosed features and/or combinations and subcombinations of several further features disclosed above. In addition, the logic flows depicted in the accompanying figures and/or described herein do not necessarily require the particular order shown, or sequential order, to achieve desirable results. Other implementations may be within the scope of the following claims.
This application claims priority from U.S. Provisional Application No. 62/679,715 filed on Jun. 1, 2018, the disclosure of which is hereby expressly incorporated herein by reference in its entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB19/54555 | 5/31/2019 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 62679715 | Jun 2018 | US |
