Patent Grant
11685883
Cell Expansion Systems (CESs) may be used to expand and differentiate cells. Cell expansion systems may be used to expand, e.g., grow, a variety of adherent and suspension cells. For example, cell expansion systems may be used to expand mesenchymal stem cells (MSCs) and other types of cells, such as bone marrow cells. Stem cells which are expanded from donor cells may be used to repair or replace damaged or defective tissues and have broad clinical applications for a wide range of diseases. Cells, of both adherent and non-adherent type, may be grown in a bioreactor in a cell expansion system.
Embodiments of the present disclosure generally relate to a cell expansion system for expanding cells. Such expansion may occur through the use of a bioreactor or cell growth chamber comprising a hollow fiber membrane. In embodiments, a hollow fiber membrane comprises a plurality of hollow fibers. Such hollow fiber membrane may include an extracapillary (EC) space and an intracapillary (IC) space. A cell expansion system may expand a variety of cell types, such as mesenchymal stem cells, cancer cells, T-cells, fibroblasts, and myoblasts. In expanding cells, a compound or coating agent may be applied to a cell growth surface. For example, an adherence-promoting compound may be applied to a cell growth surface to promote contact, e.g., adherence, and subsequent expansion of cells, such as a cell line including human mesenchymal stem cells (hMSCs). In embodiments, for cells to adhere to the surface of the hollow fibers, the surface may be modified in some way, such as by coating at least the cell growth surface with a protein, for example. In embodiments, a coating agent may be applied to the inner surface or inner aspect of bioreactor fibers. For example, a coating agent may be applied to the intracapillary (IC) surface of a hollow fiber(s). In another embodiment, a coating agent may be applied to the extracapillary (EC) surface of a hollow fiber(s). As an example of a coating agent(s), cryoprecipitate (CPPT), fibronectin (FN), human fibronectin (hFN), and/or combinations of such coating agents may be used. In other embodiments, a plurality of coating agents, or a combination of coating agent(s), may be used.
Embodiments provide for fluid movement in a cell growth chamber or bioreactor to be controlled to actively promote a coating agent(s) to a cell growth surface, e.g., to a surface of a hollow fiber(s). For example, such fluid movement may be controlled so as to move fluid from one side, e.g., IC side, of a hollow fiber to the other side, e.g., EC side, of the hollow fiber. In an embodiment, ultrafiltration may be used to move fluid in a bioreactor. For example, positive ultrafiltration may be used to move fluid from the IC side of a bioreactor to the EC side of the bioreactor. In another embodiment, negative ultrafiltration may be used to move fluid from the EC side of a bioreactor to the IC side of the bioreactor. In embodiments, other types of ultrafiltration or directions of fluid movement may be used. The direction of fluid movement may depend on the surface upon which cells are being expanded.
By controlling fluid movement, a coating solution, e.g., a fluid(s) and a coating agent(s), may be actively pushed to the IC (or EC) loop, and the fluid(s) may be pushed through the pores, for example, of a hollow fiber(s), leaving a residual layer of adherence-promoting protein(s), for example, on the IC (or EC) side of the hollow fiber(s) and therefore facilitating the contact, e.g., attachment, of cells, e.g., adherent cells. Such fluid movement, e.g., ultrafiltration, may decrease the time required for a chemical reaction between a coating agent and the growth surface of the bioreactor to occur to coat the fiber(s). Such fluid movement may be controlled through the adjusting of one or more valve(s), pump(s), or other type of fluid flow control device(s).
Embodiments of the present disclosure provide for implementing such coating procedure(s) through the use of one or more protocols or tasks for use with a cell expansion system. Such protocols or tasks may include pre-programmed protocols or tasks for use with an automated CES, for example. In embodiments, a pre-programmed, default, or otherwise previously saved task may be selected. A task may comprise one or more steps. In other embodiments, such protocols or tasks may include custom or user-defined protocols or tasks for use with an automated CES, for example. Through a user interface (UI) and graphical user interface (GUI) elements, a custom or user-defined protocol or task may be created. In embodiments, a combination of pre-programmed, default, custom, and/or user-defined tasks, for example, may be used.
This Summary is included to provide a selection of concepts in a simplified form, in which such concepts are further described below in the Detailed Description. This Summary is not intended to be used in any way to limit the claimed subject matter's scope. Features, including equivalents and variations thereof, may be included in addition to those provided herein.
Embodiments of the present disclosure may be described by referencing the accompanying figures. In the figures, like numerals refer to like items.
The following Detailed Description provides a discussion of illustrative embodiments with reference to the accompanying drawings. The inclusion of specific embodiments herein should not be construed as limiting or restricting the present disclosure. Further, while language specific to features, acts, and/or structures, for example, may be used in describing embodiments herein, the claims are not limited to the features, acts, and/or structures described. A person of skill in the art will appreciate that other embodiments, including improvements, are within the spirit and scope of the present disclosure. Further, any alternatives or additions, including any listed as separate embodiments, may be used or incorporated with any other embodiments herein described.
Embodiments of the present disclosure are generally directed to methods and systems for applying a coating agent or reagent to a cell growth surface to promote cell contact, e.g., adherence, and subsequent expansion of cells. In an embodiment, such application comprises an active promotion of a coating agent or reagent to the cell growth surface, such as the cell growth surface of a hollow fiber(s) where a hollow fiber bioreactor may be used for cell expansion in a cell expansion system. Controlling fluid movement in a bioreactor or cell growth chamber allows for the active promotion of a coating agent or reagent to a cell growth surface.
Passive coating processes may involve the passive application of a coating agent to a cell growth surface, in which a coating agent(s) may be passively applied to a cell growth chamber of an automated cell expansion system using circulating flow, for example. A coating agent(s) may be loaded into an intracapillary or extracapillary side of a bioreactor, for example. The coating agent(s) may then be circulated in the intracapillary or extracapillary loop for a particular, e.g., first, time period. As such, the bioreactor may be passively coated using circulating flow in the IC (or EC) loop, in which such process may take multiple hours, for example. Such coating procedure may take from about four (4) hours to about twenty-four (24) hours, for example, of circulation of a coating agent to achieve coating of the cell growth surface. As an example, a bioreactor coating protocol may load a coating agent into the intracapillary side of a bioreactor in a cell expansion system. The coating agent may then be circulated in the intracapillary circulation loop for a minimum of sixteen (16) hours. A user utilizing such process may therefore use at least two cell expansion systems, in which the user may begin, in a second cell expansion system, any additional expansion of a population of cells harvested from a first cell expansion system (where cells may not be stored in a non-cryopreserved state for up to sixteen (16) hours, for example).
Embodiments herein provide for the active pushing or active promotion of a coating agent solution to a cell growth surface. Rather than passively coating the bioreactor using circulating flow in the IC loop, for example, for many hours, a coating solution, e.g., a fluid(s) and a coating agent(s), can be actively pushed into the IC loop, and the fluid(s) may be pushed through the pores of the bioreactor, leaving a residual layer of adherence promoting proteins on the IC side of the bioreactor fibers to facilitate the attachment of adherent cells. In an embodiment, ultrafiltration may be used to allow a coating agent or reagent to be promoted to the growth surface of a hollow fiber, for example. Ultrafiltration, e.g., positive ultrafiltration, may be used to move fluid from a first side of a hollow fiber to a second side of a hollow fiber. For example, utilizing positive ultrafiltration of a fluid, the fluid may be moved from the IC side of a hollow fiber or hollow fiber membrane to the EC side of the hollow fiber or hollow fiber membrane. Such fluid movement may decrease the time it takes for a chemical reaction to occur between a coating agent or reagent and a growth surface of the bioreactor to coat the cell growth surface. The molecular barrier created by the specified construction of the hollow fibers in the bioreactor may be such that the coating agent or reagent may not be able to pass through the fiber wall along with the fluid in which it is suspended. The adherence promoting proteins of the coating agent may remain in a residual layer on a first side of the hollow fiber(s) as the solution is pushed through the pores of the fibers to a second side of the hollow fiber(s). Moving the fluid using ultrafiltration, e.g., positive ultrafiltration, may thus result in “actively” promoting the coating agent or reagent to the surface of the hollow fiber(s), according to embodiments.
For example, a coating agent(s) may be introduced to the fibers of a hollow fiber bioreactor on the IC (or EC) side. Such coating agent(s) may be suspended in a solution, e.g., coating solution. The IC outlet or waste valve may be closed, with the EC outlet or waste valve open. The IC inlet rate may be set to wash the IC side with media, such as phosphate buffered saline (PBS), for example. Such fluid may have no pathway but through the pores of the fibers (IC outlet valve closed). Accordingly, the solution may flow through the pores of the fibers from the IC side to the EC side. The coating agent, e.g., CPPT, may be hydrostatically deposited onto the inner wall(s) of the bioreactor fiber for a defined time period. For example, such time period may be about ten (10) minutes, according to an embodiment. Such membrane ultrafiltration method allows adherence promoting proteins to be physisorbed on the bioreactor fibers as the solution flows through the pores of the fiber from the IC side to the EC side, for example.
In an embodiment, such active moving of the coating agent to the cell growth surface(s) may significantly decrease the amount of time it may take to coat the cell growth surface as compared to other methods of coating a cell growth surface. In embodiments, such coating procedure using ultrafiltration may be referred to as an expedited coating procedure. Such expedited coating procedure using active moving of the coating agent to the cell growth surface(s) through ultrafiltration may use less time to coat the cell growth surface than procedures using passive coating procedures which may take overnight or about twelve (12) hours to about sixteen (16) hours to coat the bioreactor. For example, such expedited coating procedure may take less than or equal to about four (4) hours. In embodiments, such expedited coating procedure may take any time period in a range from above or equal to about five (5) minutes to less than or equal to about sixty (60) minutes, or any other range therein, depending on the procedure. For example, such coating procedure may take less than or equal to about ten (10) minutes, less than or equal to about twelve (12) minutes, less than or equal to about fifteen (15) minutes, less than or equal to about twenty (20) minutes, less than or equal to about thirty (30) minutes, less than or equal to about forty-five (45) minutes, less than or equal to about sixty (60) minutes, etc.
Embodiments are directed to a cell expansion system, as described above. In embodiments, such cell expansion system is closed, in which a closed cell expansion system comprises contents that are not directly exposed to the atmosphere. Such cell expansion system may be automated. In embodiments, cells, of both adherent and non-adherent or suspension type, may be grown in a bioreactor in the cell expansion system. According to embodiments, the cell expansion system may include base media or other type of media. Methods for replenishment of media are provided for cell growth occurring in a bioreactor of the closed cell expansion system. In embodiments, the bioreactor used with such systems is a hollow fiber bioreactor. Many types of bioreactors may be used in accordance with embodiments of the present disclosure.
The system may include, in embodiments, a bioreactor that further includes a first fluid flow path having at least opposing ends, a first opposing end of the first fluid flow path fluidly associated with a first port of a hollow fiber membrane and a second end of the first fluid flow path fluidly associated with a second port of the hollow fiber membrane, in which the first fluid flow path comprises an intracapillary portion of the hollow fiber membrane. In embodiments, a hollow fiber membrane comprises a plurality of hollow fibers. The system may further include a fluid inlet path fluidly associated with the first fluid flow path, in which a plurality of cells are introduced into the first fluid flow path through a first fluid inlet path. A first pump for circulating fluid in the first fluid flow path of the bioreactor may also be included. In embodiments, the system includes a controller for controlling operation of the first pump. In an embodiment, the controller is a computing system, including a processor, for example. The controller is configured, in embodiments, to control the pump to circulate a fluid at a first rate within the first fluid flow path. In some embodiments, a second pump for transferring intracapillary inlet fluid from an intracapillary media bag to the first fluid flow path and a second controller for controlling operation of the second pump are included. The second controller, in embodiments, controls the second pump to transfer cells from a cell inlet bag to the first fluid flow path, for example. Additional controllers, e.g., third controller, fourth controller, fifth controller, sixth controller, etc., may be used in accordance with embodiments. Further, additional pumps, e.g., third pump, fourth pump, fifth pump, sixth pump, etc., may be used in accordance with embodiments of the present disclosure. In addition, while the present disclosure may refer to a media bag, a cell inlet bag, etc., multiple bags, e.g., a first media bag, a second media bag, a third media bag, a first cell inlet bag, a second cell inlet bag, a third cell inlet bag, etc., and/or other types of containers, may be used in embodiments. In other embodiments, a single media bag, a single cell inlet bag, etc., may be used. Further, additional or other fluid paths, e.g., a second fluid flow path, a second fluid inlet path, etc., may be included in embodiments.
In other embodiments, the system is controlled by, for example: a processor coupled to the cell expansion system; a display device, in communication with the processor, and operable to display data; and a memory, in communication with and readable by the processor, and containing a series of instructions. In embodiments, when the instructions are executed by the processor, the processor receives an instruction to coat the bioreactor, for example. In response to the instruction to coat the bioreactor, the processor may execute a series of steps to coat the bioreactor and may next receive an instruction to load cells into the bioreactor, for example. In response to the instruction to load cells, the processor may execute a series of steps to load the cells from a cell inlet bag, for example, into the bioreactor.
A schematic of an example cell expansion system (CES) is depicted in
Second fluid circulation path 14 includes second fluid flow path 34, cell growth chamber 24, and a second fluid flow control device 32. The second fluid flow path 34 has at least opposing ends 36 and 38, according to embodiments. Opposing ends 36 and 38 of second fluid flow path 34 may be fluidly associated with inlet port 40 and outlet port 42 respectively of cell growth chamber 24. Fluid flowing through cell growth chamber 24 may be in contact with the outside of hollow fiber membrane 117 (see
First and second fluid circulation paths 12 and 14 may thus be separated in cell growth chamber 24 by a hollow fiber membrane 117 (see
Fluid inlet path 44 may be fluidly associated with first fluid circulation path 12. Fluid inlet path 44 allows fluid into first fluid circulation path 12, while fluid outlet path 46 allows fluid to leave CES 10. Third fluid flow control device 48 may be operably associated with fluid inlet path 44. Alternatively, third fluid flow control device 48 may alternatively be associated with first outlet path 46.
Fluid flow control devices as used herein may comprise a pump, valve, clamp, or combination thereof, according to embodiments. Multiple pumps, valves, and/or clamps can be arranged in any combination. In various embodiments, the fluid flow control device is or includes a peristaltic pump. In embodiments, fluid circulation paths, inlet ports, and outlet ports may be constructed of tubing of any material.
Various components are referred to herein as “operably associated.” As used herein, “operably associated” refers to components that are linked together in operable fashion and encompasses embodiments in which components are linked directly, as well as embodiments in which additional components are placed between the two linked components. “Operably associated” components can be “fluidly associated.” “Fluidly associated” refers to components that are linked together such that fluid can be transported between them. “Fluidly associated” encompasses embodiments in which additional components are disposed between the two fluidly associated components, as well as components that are directly connected. Fluidly associated components can include components that do not contact fluid, but contact other components to manipulate the system (e.g., a peristaltic pump that pumps fluids through flexible tubing by compressing the exterior of the tube).
Generally, any kind of fluid, including buffers, protein containing fluid, and cell-containing fluid, for example, can flow through the various circulations paths, inlet paths, and outlet paths. As used herein, “fluid,” “media,” and “fluid media” are used interchangeably.
Turning to
According to embodiments of the present disclosure, fluid in a first circulation path enters cell growth chamber 100 through IC inlet port 108 at a first longitudinal end 112 of the cell growth chamber 100, passes into and through the intracapillary side (referred to in various embodiments as the intracapillary (“IC”) side or “IC space” of a hollow fiber membrane) of a plurality of hollow fibers 116 comprising hollow fiber membrane 117, and out of cell growth chamber 100 through IC outlet port 120 located at a second longitudinal end 124 of the cell growth chamber 100. The fluid path between the IC inlet port 108 and the IC outlet port 120 defines the IC portion 126 of the cell growth chamber 100. Fluid in a second circulation path flows in the cell growth chamber 100 through EC inlet port 128, comes in contact with the extracapillary side or outside (referred to as the “EC side” or “EC space” of the membrane) of the hollow fibers 116, and exits cell growth chamber 100 via EC outlet port 132. The fluid path between the EC inlet port 128 and the EC outlet port 132 comprises the EC portion 136 of the cell growth chamber 100. Fluid entering cell growth chamber 100 via the EC inlet port 128 may be in contact with the outside of the hollow fibers 116. Small molecules (e.g., ions, water, oxygen, lactate, etc.) may diffuse through the hollow fibers 116 from the interior or IC space of the hollow fiber to the exterior or EC space, or from the EC space to the IC space. Large molecular weight molecules, such as growth factors, are typically too large to pass through the hollow fiber membrane, and may remain in the IC space of the hollow fibers 116. The media may be replaced as needed, in embodiments. Media may also be circulated through an oxygenator or gas transfer module to exchange gasses as needed. Cells may be contained within a first circulation path and/or a second circulation path, as described below, and may be on either the IC side and/or EC side of the membrane, according to embodiments.
The material used to make the hollow fiber membrane 117 may be any biocompatible polymeric material which is capable of being made into hollow fibers. One material which may be used is a synthetic polysulfone-based material, according to an embodiment of the present disclosure. In order for the cells to adhere to the surface of the hollow fibers, the surface may be modified in some way, either by coating at least the cell growth surface with a protein such as fibronectin or collagen, for example, or by exposing the surface to radiation, according to embodiments. Gamma treating the membrane surface allows for attachment of adherent cells without additionally coating the membrane with fibronectin, cryoprecipitate, or the like. Bioreactors made of gamma treated membranes may be reused. Other coatings and/or treatments for cell attachment may be used in accordance with embodiments of the present disclosure.
In embodiments, the CES (such as CES 500 (see
A first rotational rocking component 138 rotates the bioreactor 100 around central axis 142 of the bioreactor 100. Rotational rocking component 138 may be rotationally associated with bioreactor 100. In embodiments, bioreactor 100 may be rotated continuously in a single direction around central axis 142 in a clockwise or counterclockwise direction. Alternatively, bioreactor 100 may rotate in alternating fashion, first clockwise, then counterclockwise, for example, around central axis 142, according to embodiments.
The CES may also include a second rotational rocking component that rotates bioreactor 100 around rotational axis 144. Rotational axis 144 may pass through the center point of bioreactor 100 and may be normal to central axis 142. Bioreactor 100 may be rotated continuously in a single direction around rotational axis 144 in a clockwise or counterclockwise direction, in embodiments. Alternatively, bioreactor 100 may be rotated around rotational axis 144 in an alternating fashion, first clockwise, then counterclockwise, for example. In various embodiments, bioreactor 100 may also be rotated around rotational axis 144 and positioned in a horizontal or vertical orientation relative to gravity.
In embodiments, lateral rocking component 140 may be laterally associated with bioreactor 100. The plane of lateral rocking component 140 moves laterally in the −x and −y directions, in embodiments. The settling of cells in the bioreactor may be reduced by movement of cell-containing media within the hollow fibers, according to embodiments.
The rotational and/or lateral movement of a rocking device may reduce the settling of cells within the device and reduce the likelihood of cells becoming trapped within a portion of the bioreactor. The rate of cells settling in the cell growth chamber is proportional to the density difference between the cells and the suspension media, according to Stoke's Law. In some embodiments, a 180 degree rotation (fast) with a pause (having a total combined time of 30 seconds, for example) repeated as described above keeps non-adherent red blood cells suspended. A minimum rotation of about 180 degrees would be preferred in an embodiment; however, one could use rotation of up to 360 degrees or greater. Different rocking components may be used separately, or may be combined in any combination. For example, a rocking component that rotates bioreactor 100 around central axis 142 may be combined with the rocking component that rotates bioreactor 100 around axis 144. Likewise, clockwise and counterclockwise rotation around different axes may be performed independently in any combination.
Turning to
Next,
In accordance with embodiments, a shaft or rocker control 258 for rotating the bioreactor 100 is shown. Shaft fitting 260 associated with the shaft or rocker control 258 allows for proper alignment of a shaft access aperture, see e.g., 424 (
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According to embodiments, the pre-mounted fluid conveyance assembly 400 includes tubing 408A, 408B, 408C, 408D, 408E, etc., and various tubing fittings to provide the fluid paths shown in
Next,
With regard to the IC loop 502, samples of media may be obtained from sample port 516 or sample coil 518 during operation. Pressure/temperature gauge 520 disposed in first fluid circulation path 502 allows detection of media pressure and temperature during operation. Media then returns to IC inlet port 501A to complete fluid circulation path 502. Cells grown/expanded in cell growth chamber 501 may be flushed out of cell growth chamber 501 into harvest bag 599 through valve 598 or redistributed within the hollow fibers for further growth.
Fluid in second fluid circulation path 504 enters cell growth chamber 501 via EC inlet port 501C, and leaves cell growth chamber 501 via EC outlet port 501D. Media in the EC loop 504 may be in contact with the outside of the hollow fibers in the cell growth chamber 501, thereby allowing diffusion of small molecules into and out of the hollow fibers.
Pressure/temperature gauge 524 disposed in the second fluid circulation path 504 allows the pressure and temperature of media to be measured before the media enters the EC space of the cell growth chamber 501, according to an embodiment. Pressure gauge 526 allows the pressure of media in the second fluid circulation path 504 to be measured after it leaves the cell growth chamber 501. With regard to the EC loop, samples of media may be obtained from sample port 530 or a sample coil during operation.
In embodiments, after leaving EC outlet port 501D of cell growth chamber 501, fluid in second fluid circulation path 504 passes through EC circulation pump 528 to oxygenator or gas transfer module 532. EC circulation pump 528 may also pump the fluid in opposing directions. Second fluid flow path 522 may be fluidly associated with oxygenator or gas transfer module 532 via oxygenator inlet port 534 and oxygenator outlet port 536. In operation, fluid media flows into oxygenator or gas transfer module 532 via oxygenator inlet port 534, and exits oxygenator or gas transfer module 532 via oxygenator outlet port 536. Oxygenator or gas transfer module 532 adds oxygen to, and removes bubbles from, media in the CES 500, for example. In various embodiments, media in second fluid circulation path 504 may be in equilibrium with gas entering oxygenator or gas transfer module 532. The oxygenator or gas transfer module 532 may be any appropriately sized oxygenator or gas transfer device. Air or gas flows into oxygenator or gas transfer module 532 via filter 538 and out of oxygenator or gas transfer device 532 through filter 540. Filters 538 and 540 reduce or prevent contamination of oxygenator or gas transfer module 532 and associated media. Air or gas purged from the CES 500 during portions of a priming sequence may vent to the atmosphere via the oxygenator or gas transfer module 532.
In the configuration depicted for CES 500, fluid media in first fluid circulation path 502 and second fluid circulation path 504 flows through cell growth chamber 501 in the same direction (a co-current configuration). The CES 500 may also be configured to flow in a counter-current conformation.
In accordance with at least one embodiment, media, including cells (from bag 562), and fluid media from bag 546 may be introduced to first fluid circulation path 502 via first fluid flow path 506. Fluid container 562 (e.g., Cell Inlet Bag or Saline Priming Fluid for priming air out of the system) may be fluidly associated with the first fluid flow path 506 and the first fluid circulation path 502 via valve 564.
Fluid containers, or media bags, 544 (e.g., Reagent) and 546 (e.g., IC Media) may be fluidly associated with either first fluid inlet path 542 via valves 548 and 550, respectively, or second fluid inlet path 574 via valves 570 and 576. First and second sterile sealable input priming paths 508 and 509 are also provided. An air removal chamber (ARC) 556 may be fluidly associated with first circulation path 502. The air removal chamber 556 may include one or more ultrasonic sensors including an upper sensor and lower sensor to detect air, a lack of fluid, and/or a gas/fluid interface, e.g., an air/fluid interface, at certain measuring positions within the air removal chamber 556. For example, ultrasonic sensors may be used near the bottom and/or near the top of the air removal chamber 556 to detect air, fluid, and/or an air/fluid interface at these locations. Embodiments provide for the use of numerous other types of sensors without departing from the spirit and scope of the present disclosure. For example, optical sensors may be used in accordance with embodiments of the present disclosure. Air or gas purged from the CES 500 during portions of the priming sequence or other protocols may vent to the atmosphere out air valve 560 via line 558 that may be fluidly associated with air removal chamber 556.
EC media (e.g., from bag 568) or wash solution (e.g., from bag 566) may be added to either the first or second fluid flow paths. Fluid container 566 may be fluidly associated with valve 570 that may be fluidly associated with first fluid circulation path 502 via distribution valve 572 and first fluid inlet path 542. Alternatively, fluid container 566 may be fluidly associated with second fluid circulation path 504 via second fluid inlet path 574 and EC inlet path 584 by opening valve 570 and closing distribution valve 572. Likewise, fluid container 568 may be fluidly associated with valve 576 that may be fluidly associated with first fluid circulation path 502 via first fluid inlet path 542 and distribution valve 572. Alternatively, fluid container 568 may be fluidly associated with second fluid inlet path 574 by opening valve 576 and closing distribution valve 572.
An optional heat exchanger 552 may be provided for media reagent or wash solution introduction.
In the IC loop, fluid may be initially advanced by the IC inlet pump 554. In the EC loop, fluid may be initially advanced by the EC inlet pump 578. An air detector 580, such as an ultrasonic sensor, may also be associated with the EC inlet path 584.
In at least one embodiment, first and second fluid circulation paths 502 and 504 are connected to waste or outlet line 588. When valve 590 is opened, IC media may flow through waste line 588 and to waste or outlet bag 586. Likewise, when valve 582 is opened, EC media may flow through waste line 588 to waste or outlet bag 586.
In embodiments, cells may be harvested via cell harvest path 596. Here, cells from cell growth chamber 501 may be harvested by pumping the IC media containing the cells through cell harvest path 596 and valve 598 to cell harvest bag 599.
Various components of the CES 500 may be contained or housed within a machine or housing, such as cell expansion machine 202 (
Turning to
With regard to the IC loop, samples of media may be obtained from sample coil 618 during operation. Media then returns to IC inlet port 601A to complete fluid circulation path 602. Cells grown/expanded in cell growth chamber 601 may be flushed out of cell growth chamber 601 into harvest bag 699 through valve 698 and line 697. Alternatively, when valve 698 is closed, the cells may be redistributed within chamber 601 for further growth.
Fluid in second fluid circulation path 604 enters cell growth chamber 601 via EC inlet port 601C and leaves cell growth chamber 601 via EC outlet port 601D. Media in the EC loop may be in contact with the outside of the hollow fibers in the cell growth chamber 601, thereby allowing diffusion of small molecules into and out of the hollow fibers that may be within chamber 601, according to an embodiment.
Pressure/temperature sensor 624 disposed in the second fluid circulation path 604 allows the pressure and temperature of media to be measured before the media enters the EC space of the cell growth chamber 601. Sensor 626 allows the pressure and/or temperature of media in the second fluid circulation path 604 to be measured after it leaves the cell growth chamber 601. With regard to the EC loop, samples of media may be obtained from sample port 630 or a sample coil during operation.
After leaving EC outlet port 601D of cell growth chamber 601, fluid in second fluid circulation path 604 passes through EC circulation pump 628 to oxygenator or gas transfer module 632. EC circulation pump 628 may also pump the fluid in opposing directions, according to embodiments. Second fluid flow path 622 may be fluidly associated with oxygenator or gas transfer module 632 via an inlet port 632A and an outlet port 632B of oxygenator or gas transfer module 632. In operation, fluid media flows into oxygenator or gas transfer module 632 via inlet port 632A, and exits oxygenator or gas transfer module 632 via outlet port 632B. Oxygenator or gas transfer module 632 adds oxygen to, and removes bubbles from, media in the CES 600, for example. In various embodiments, media in second fluid circulation path 604 may be in equilibrium with gas entering oxygenator or gas transfer module 632. The oxygenator or gas transfer module 632 may be any appropriately sized device useful for oxygenation or gas transfer. Air or gas flows into oxygenator or gas transfer module 632 via filter 638 and out of oxygenator or gas transfer device 632 through filter 640. Filters 638 and 640 reduce or prevent contamination of oxygenator or gas transfer module 632 and associated media. Air or gas purged from the CES 600 during portions of a priming sequence may vent to the atmosphere via the oxygenator or gas transfer module 632.
In the configuration depicted for CES 600, fluid media in first fluid circulation path 602 and second fluid circulation path 604 flows through cell growth chamber 601 in the same direction (a co-current configuration). The CES 600 may also be configured to flow in a counter-current conformation, according to embodiments.
In accordance with at least one embodiment, media, including cells (from a source such as a cell container, e.g., a bag) may be attached at attachment point 662, and fluid media from a media source may be attached at attachment point 646. The cells and media may be introduced into first fluid circulation path 602 via first fluid flow path 606. Attachment point 662 may be fluidly associated with the first fluid flow path 606 via valve 664, and attachment point 646 may be fluidly associated with the first fluid flow path 606 via valve 650. A reagent source may be fluidly connected to point 644 and be associated with fluid inlet path 642 via valve 648, or second fluid inlet path 674 via valves 648 and 672.
Air removal chamber (ARC) 656 may be fluidly associated with first circulation path 602. The air removal chamber 656 may include one or more sensors including an upper sensor and lower sensor to detect air, a lack of fluid, and/or a gas/fluid interface, e.g., an air/fluid interface, at certain measuring positions within the air removal chamber 656. For example, ultrasonic sensors may be used near the bottom and/or near the top of the air removal chamber 656 to detect air, fluid, and/or an air/fluid interface at these locations. Embodiments provide for the use of numerous other types of sensors without departing from the spirit and scope of the present disclosure. For example, optical sensors may be used in accordance with embodiments of the present disclosure. Air or gas purged from the CES 600 during portions of a priming sequence or other protocol(s) may vent to the atmosphere out air valve 660 via line 658 that may be fluidly associated with air removal chamber 656.
An EC media source may be attached to EC media attachment point 668, and a wash solution source may be attached to wash solution attachment point 666, to add EC media and/or wash solution to either the first or second fluid flow path. Attachment point 666 may be fluidly associated with valve 670 that may be fluidly associated with first fluid circulation path 602 via valve 672 and first fluid inlet path 642. Alternatively, attachment point 666 may be fluidly associated with second fluid circulation path 604 via second fluid inlet path 674 and second fluid flow path 684 by opening valve 670 and closing valve 672. Likewise, attachment point 668 may be fluidly associated with valve 676 that may be fluidly associated with first fluid circulation path 602 via first fluid inlet path 642 and valve 672. Alternatively, fluid container 668 may be fluidly associated with second fluid inlet path 674 by opening valve 676 and closing distribution valve 672.
In the IC loop, fluid may be initially advanced by the IC inlet pump 654. In the EC loop, fluid may be initially advanced by the EC inlet pump 678. An air detector 680, such as an ultrasonic sensor, may also be associated with the EC inlet path 684.
In at least one embodiment, first and second fluid circulation paths 602 and 604 are connected to waste or outlet line 688. When valve 690 is opened, IC media may flow through waste line 688 and to waste or outlet bag 686. Likewise, when valve 692 is opened, EC media may flow to waste or outlet bag 686.
After cells have been grown in cell growth chamber 601, they may be harvested via cell harvest path 697. Here, cells from cell growth chamber 601 may be harvested by pumping the IC media containing the cells through cell harvest path 697, with valve 698 open, into cell harvest bag 699.
Various components of the CES 600 may be contained or housed within a machine or housing, such as cell expansion machine 202 (
Examples and further description of cell expansion systems are provided in U.S. patent application Ser. No. 12/042,798 (U.S. Pat. No. 8,309,347), entitled, “Cell Expansion System and Methods of Use,” issued on Nov. 13, 2012, which is hereby incorporated by reference herein in its entirety for all that it teaches and for all purposes.
While various example embodiments of a cell expansion system and methods associated therewith have been described,
In an embodiment, to further prime the bioreactor 501, 601, a bag (e.g., 568) may be attached (for example, to connection point 668) to the system 500, 600. Valve 576, 676 may be opened. A media, e.g., PBS, can then be directed into the second fluid circulation path 504, 604 by the EC inlet pump 578, 678 set to pump the media into the second fluid circulation path 504, 604. Valve 582, 692 may be closed while the media enters the bioreactor 501, 601 through the inlet 501C, 601C and out the outlet 501D, 601D of the EC loop. Once the bioreactor 501, 601 and/or the second fluid circulation path 504, 604 have media therein with air removed, e.g., by an air removal chamber, the bioreactor 501, 601 is primed, according to an embodiment.
Process 700 then proceeds to coat the cell growth surface, e.g., bioreactor 501, 601, in step 708, in which the cell growth surface may be coated with a coating agent or reagent. Any coating agent(s) or reagent(s), such as fibronectin or cryoprecipitate, for example, understood by those of skill in the art may be used. In embodiments, any combination of coating agent(s) or reagent(s) may be used. In an embodiment, an outlet or waste valve 590, 690 to one of the circulation loops, e.g., IC loop 502, 602, may be closed, while the outlet or waste valve 582, 692 to the other circulation loop, e.g., EC loop 504, 604, may be opened or remains open. For example, the IC waste or outlet valve 590, 690 may be closed while the EC waste or outlet valve 582, 692 is open. In embodiments, a coating agent or reagent may be loaded into a circulation loop, e.g., IC loop 502, 602, of the cell expansion system 500, 600 until the reagent bag (e.g., 544) or container is empty. Next, the reagent may be chased from an air removal chamber 556, 656 into the circulation loop, e.g., IC loop 502, 602. The bioreactor 501, 601, e.g., cell growth surface of hollow fibers where a hollow fiber bioreactor is used, may then be coated by controlling the fluid movement in the bioreactor 501, 601. In embodiments, such control of the fluid movement uses ultrafiltration, e.g., positive ultrafiltration, to move fluid from one side (e.g., the IC side 502, 602) of the bioreactor 501, 601 to the other side (e.g., the EC side 504, 604). For example, where the IC outlet or waste valve 590, 690 may be closed, with the EC outlet or waste valve open 582, 692, a fluid in the bioreactor 501, 601 may have no pathway but through the pores of the fibers (IC outlet valve 590, 690 closed). In an embodiment, the IC inlet rate may be set to wash the IC side 502, 602 with media or a fluid, such as phosphate buffered saline (PBS), for example. Accordingly, the solution may then flow through the pores of the fibers from the IC side 502, 602 to the EC side 504, 604. The coating agent, e.g., CPPT, may be hydrostatically deposited onto the wall(s), e.g., inner wall(s), of the bioreactor fiber for a defined time period. For example, such time period may be about ten (10) minutes, according to an embodiment. Other time periods may apply according to other embodiments of the present disclosure. Such membrane ultrafiltration method allows adherence promoting proteins to be physisorbed on the bioreactor fibers as the solution flows through the pores of the fiber from the IC side 502, 602 to the EC side 504, 604.
An example of the solutions being introduced to the system 500, 600 to coat the bioreactor may be as shown below:
The coating of the bioreactor may occur in three stages. An example of the settings for the system 500, 600 for the first stage of introducing the solution(s) above may be as shown below:
An example of the settings for the system 500, 600 for the second stage of coating the bioreactor, which chases or washes reagent from the air removal chamber 556, 656, may be as shown below:
An example of the settings for the system 500, 600 for the third stage of coating the bioreactor, which causes ultrafiltration from the IC side 502, 602 to the EC side 504, 604, for example, may be as shown below:
In an embodiment, such active promoting of the coating agent to a cell growth surface, as described above, may significantly decrease the amount of time to coat the cell growth surface as compared to other methods of coating a cell growth surface. In embodiments, such coating procedure using ultrafiltration may be referred to as an expedited coating procedure. Such expedited coating procedure using active moving of the coating agent to the cell growth surface(s) through ultrafiltration may use less time to coat the cell growth surface than procedures using passive coating procedures which may take overnight or about twelve (12) hours to about sixteen (16) hours to coat the bioreactor. For example, such expedited coating procedure may take less than or equal to about four (4) hours. In embodiments, such expedited coating procedure may take any time period in a range from above or equal to about five (5) minutes to less than or equal to about sixty (60) minutes, or any other range therein, depending on the procedure. For example, such coating procedure may take less than or equal to about ten (10) minutes, less than or equal to about twelve (12) minutes, less than or equal to about fifteen (15) minutes, less than or equal to about twenty (20) minutes, less than or equal to about thirty (30) minutes, less than or equal to about forty-five (45) minutes, less than or equal to about sixty (60) minutes, etc. As described above, passive coating procedures may take about sixteen (16) hours to coat the bioreactor, for example. A significant time savings may be realized by using ultrafiltration for coating the bioreactor.
Returning to
An example of the settings for an IC/EC Washout task of the system 500, 600 may be as shown below:
Next, to maintain the proper or desired gas concentration across the fibers in the bioreactor membrane, the condition media task 712 may be executed to allow the media to reach equilibrium with the provided gas supply before cells are loaded into the bioreactor. For example, rapid contact between the media and the gas supply provided by the gas transfer module or oxygenator 532, 632 may be provided by using a high EC circulation rate. The system 500, 600 may then be maintained in a proper or desired state until a user or operator, for example, is ready to load cells into the bioreactor 501, 601. In an embodiment, the system 500, 600 may be conditioned with complete media, for example. Complete media may be any media source used for cell growth. In an embodiment, complete media may comprise alpha-MEM (α-MEM) and fetal bovine serum (FBS), for example. Any type of media known to those of skill in the art may be used.
The condition media task 712 may be a two-step process where, in the first step, the system 500, 600 provides rapid contact between the media and the gas supply by using a high EC circulation rate.
In the second step, the system 500, 600 maintains the bioreactor 501, 601 in a proper state until an operator, for example, is ready to load the cells. An example of the solutions being introduced to the system 500, 600 during the condition media task 712 may be as shown below.
While an example media is shown in Table 7, any type of media known to those of skill in the art may be used.
An example of the settings for a first step of the condition media task 712 may be as shown below:
An example of the settings for a second step of the condition media task 712 may be as shown below:
Process 700 next proceeds to loading cells 714 into the bioreactor 501, 601 from a cell inlet bag 562 (at connection point 662), for example. In an embodiment, the cells are loaded with uniform suspension 714. In an embodiment, the cells may be loaded into the bioreactor 501, 601 from the cell inlet bag 562 (at connection point 662) until the bag 562 is empty. Cells may then be chased or washed from the air removal chamber 556, 656 to the bioreactor 501, 601, according to an embodiment. In embodiments that utilize larger chase volumes, cells may be spread and move toward the IC outlet port 501B, 601B. The distribution of cells may be promoted across the membrane via IC circulation, such as through an IC circulation pump 512, 612, with no IC inlet, for example. Examples and further description of loading and distributing cells are provided in U.S. patent application Ser. No. 13/971,500 (U.S. Pat. No. 9,175,259), entitled, “Method of Loading and Distributing Cells in a Bioreactor of a Cell Expansion System,” issued Nov. 3, 2015, which is hereby incorporated by reference herein in its entirety for all that it teaches and for all purposes.
In another embodiment, the cells may be loaded 714 using another type of cell loading, such as a high flux cell load. In yet another embodiment, the cells may be loaded 714 using another type of loading, such as a bulls-eye cell loading technique. Examples and further description of bulls-eye cell loading procedure(s) are provided in U.S. patent application Ser. No. 14/542,276 (U.S. Pat. No. 9,617,506), entitled, “Expanding Cells in a Bioreactor,” issued on Apr. 11, 2017, which is hereby incorporated by reference herein in its entirety for all that it teaches and for all purposes.
An example of the solutions being introduced to the system 500, 600 to load cells 714 may be as shown below:
The loading of cells 714 may occur in stages. An example of the settings for the system 500, 600 for an example first stage may be as shown below:
An example of the settings for the system 500, 600 for an example second stage may be as shown below:
An example of the settings for the system 500, 600 for an example third stage may be as shown below:
Further, the cells, e.g., adherent cells, may be allowed to attach 716 to the hollow fibers. In an embodiment, in allowing the cells to attach 716, adherent cells are enabled to attach to the bioreactor membrane while allowing flow on the EC circulation loop 504, 604, with the pump (e.g., 512, 612, 554, 654) flow rate to the IC loop 502, 602 set to zero. An example of the solutions being introduced to the system 500, 600 during the process of cells attaching to the membrane 716 may be as shown below:
An example of the settings for attaching to the membrane 716 in the system 500, 600 may be as shown below:
Next, the cells may be fed in step 718, in which a flow rate, e.g., low flow rate in an embodiment, is continuously added to the IC circulation loop 502, 602 and/or the EC circulation loop 504, 604. In an embodiment, the cells may be fed with media, such as media with protein, for example. Outlet settings allow for the removal of fluid added to the system, in accordance with embodiments. An example of the solutions being introduced to the system 500, 600 during the feed step 718 may be as shown below:
An example of the settings for the feed step 718 in the system 500, 600 may be as shown below:
When it is determined to harvest the expanded cells, such as after the cells have reached confluence, after a defined period of time, according to user preference, etc., process 700 proceeds to release cells 720, in which the cells may be released from the membrane of the bioreactor 501, 601 and may be suspended in the IC loop 502, 602. Following the release of any adherent cells, harvest operation 722 transfers the cells in suspension from the IC circulation loop 502, 602, including any cells remaining in the bioreactor 501, 601, to a harvest bag 599, 699 or other container. Process 700 then terminates at END operation 724.
The releasing of cells 720 and harvesting of those cells 722 may be a five-step process, according to embodiments. An example of the solutions being introduced to the system 500, 600 during the release/harvest steps 720, 722 may be as shown below:
A first step in the releasing of cells 720 may perform an IC/EC Washout task in preparation for adding a reagent. For example, IC/EC media may be replaced with a phosphate buffered saline (PBS) to remove protein, calcium (Ca2+), and magnesium (Mg2+) in preparation for adding trypsin, or another chemical-releasing agent, to release any adherent cells. An example of the settings for an example first step of the release step 720 with the system 500, 600 may be as shown below:
A second step of the releasing cell process 720 includes loading a reagent into the system 500, 600 until the reagent bag 544 is empty. An example of the settings for an example second step of the release step 720 with the system 500, 600 may be as shown below:
A third step in the releasing cell process can chase the reagent into the IC loop 502, 602. An example of the settings for an example third step of the release step 720 with the system 500, 600 may be as shown below:
A fourth step in the releasing cell process 720 can mix the reagent within the IC loop 502, 602. An example of the settings for an example fourth step of the release step 720 with the system 500, 600 may be as shown below:
An example of the settings for an example fifth step, which may generally be a harvest step 722, with the system 500, 600 may be as shown below:
As described above, following release step 720 and harvest step 722, process 700 terminates at END operation 724.
Turning to
In an embodiment, prior to loading such reagent or coating agent, an outlet or waste valve 590, 690 to one of the circulation loops, e.g., IC loop 502, 602, may be closed, while the outlet or waste valve 582, 692 to the other circulation loop, e.g., EC loop 504, 604, remains open. For example, the IC waste or outlet valve 590, 690 may be closed while the EC waste or outlet valve 582, 692 may be open, according to an embodiment. In another embodiment, such closing of an outlet or waste valve, e.g., IC waste or outlet valve 590, 690, while keeping another outlet or waste valve, e.g., EC waste or outlet valve 582, 692, open may occur after loading the reagent into the circulation loop 502, 602. In other embodiments, other types of fluid flow control device(s) to control fluid movement may be used as understood by a person of skill in the art.
Next, the reagent may be chased or washed 806 from an air removal chamber 556, 656 into the circulation loop, e.g., IC loop 502, 602. Example parameters 824 and 828 for such chase step 806 may be found in
The cell growth surface of the bioreactor 501, 601, e.g., cell growth surface of hollow fibers where a hollow fiber bioreactor is used, may then be coated 808 by controlling the fluid movement, e.g., ultrafiltration, in the bioreactor 501, 601. Example parameters 826 and 828 for such coating step 808 may be found in
As described above, control of the fluid movement may use ultrafiltration, such as positive ultrafiltration, to move fluid from one side (the IC side 502, 602) of the bioreactor 501, 601 to the other side (the EC side 504, 604), according to embodiments. For example, where the IC outlet or waste valve 590, 690 may be closed, with the EC outlet or waste valve 582, 692 open, a fluid in the bioreactor 501, 601 may have no pathway but through the pores of the fibers (IC outlet valve 590, 690 closed). In an embodiment, the IC inlet rate may be set to wash the IC side 502, 602 with media or a fluid, such as phosphate buffered saline (PBS), for example. Accordingly, the solution may flow through the pores of the fibers from the IC side 502, 602 to the EC side 504, 604. Such coating agent, e.g., CPPT, may be hydrostatically deposited onto the inner wall(s) of the bioreactor fiber for a defined time period. For example, such time period may be about ten (10) minutes, according to an embodiment. Such membrane ultrafiltration method allows adherence promoting proteins to be physisorbed on the bioreactor fibers as the coating solution flows through the pores of the fiber from the IC side to the EC side, for example.
As described above, the active promoting of the coating agent to a cell growth surface may significantly decrease the amount of time it may take to coat the growth surface as compared to other methods of coating a growth surface. In embodiments, such coating procedure using ultrafiltration may be referred to as an expedited coating procedure. Such expedited coating procedure using active moving of the coating agent to the cell growth surface(s) through ultrafiltration may use less time to coat the cell growth surface than procedures using passive coating procedures which may take overnight or about twelve (12) hours to about sixteen (16) hours to coat the bioreactor. For example, such expedited coating procedure may take less than or equal to about four (4) hours. In embodiments, such expedited coating procedure may take any time period in a range from above or equal to about five (5) minutes to less than or equal to about sixty (60) minutes, or any other range therein, depending on the procedure. For example, such coating procedure may take less than or equal to about ten (10) minutes, less than or equal to about twelve (12) minutes, less than or equal to about fifteen (15) minutes, less than or equal to about twenty (20) minutes, less than or equal to about thirty (30) minutes, less than or equal to about forty-five (45) minutes, less than or equal to about sixty (60) minutes, etc.
Following the application of the reagent or coating agent to the cell growth surface, process 800 then terminates at END operation 810.
While
Returning to
Turning to
Returning to
Next, the agent or reagent may be chased or washed 908 from an air removal chamber 556, 656 into the circulation loop, e.g., IC loop 502, 602. Process 900 next proceeds to set a first inlet rate 910, e.g., IC inlet rate, to wash a first side, e.g., IC side 816 (
Such washing, or increased inlet rate, promotes the movement of fluid 912 from a first side 816 (
Turning to
Returning to
Next, process 916 proceeds to optional step 924, in which the settings for a first wash may be set. During such first wash, the agent may be chased or washed from an air removal chamber 556, 656 into the circulation loop, e.g., IC loop 502, 602. The settings may include, for example, optionally setting a first inlet rate 926 and/or optionally setting a first stop condition 928. An example of a first stop condition may include a particular volume, e.g., an IC volume. Optional settings 926 and 928 are offered merely for illustrative purposes. Other settings and/or subsets of settings to control a first wash may be included. There may be fewer or more settings as represented by ellipsis 927. When settings for a first wash are set, process 916 next proceeds to optional first wash 930.
Following optional first wash 930 (or where no first wash is desired, following load agent 922), process 916 proceeds to set second wash settings 932. For example, a second inlet rate, e.g., IC inlet rate, may be set 934 to wash a first side, e.g., IC side 816 (
Additional or other settings may also be set to control such second wash. For example, a second stop condition may be set 936. Such stop condition may include a time period, or time interval, in which the second wash may be stopped when such stop condition is reached. As an example, a ten (10) minute time period may be set as a second stop condition for a second wash. Any time period may be used in accordance with embodiments of the present disclosure. Settings 934 and 936 are offered merely for illustrative purposes. Other settings and/or subsets of settings to control a second wash may be included. There may be fewer or more settings as represented by ellipsis 935.
Following the entering of the second wash settings at step 932, process 916 next proceeds to conducting a second wash 938. Such washing, or increased inlet rate, promotes the movement of fluid from a first side 816 (
Active promoting of the coating agent to a cell growth surface may significantly decrease the amount of time it may take to coat the growth surface as compared to other methods of coating a growth surface. In embodiments, such coating procedure using ultrafiltration may be referred to as an expedited coating procedure. For example, such expedited coating procedure may take less than or equal to about four (4) hours. In an embodiment, such fluid movement may occur for a specified time period, e.g., about ten (10) minutes, to allow for such coating. For example, such coating procedure may take any time period in a range from above or equal to about five (5) minutes to less than or equal to about sixty (60) minutes, or any other range therein, depending on the procedure. For example, such coating procedure may take less than or equal to about ten (10) minutes, less than or equal to about twelve (12) minutes, less than or equal to about fifteen (15) minutes, less than or equal to about twenty (20) minutes, less than or equal to about thirty (30) minutes, less than or equal to about forty-five (45) minutes, less than or equal to about sixty (60) minutes, etc. Any time period may be used in accordance with embodiments of the present disclosure. In an embodiment, such time period may be based on a stop condition, such as a second stop condition set in step 936. For example, a stop condition may be set where an automated CES is used to expand cells. In other embodiments, other conditions may be used to determine when to stop or decrease the active promotion of the fluid. For example, such active promotion may be stopped or decreased when a media bag (e.g., 566) containing the wash solution is empty. Other conditions may be used according to embodiments. Process 916 then terminates at END operation 940.
With respect to the processes illustrated in
Examples and further description of tasks and protocols, including custom tasks and pre-programmed tasks, for use with a cell expansion system are provided in U.S. patent application Ser. No. 13/269,323 (“Configurable Methods and Systems of Growing and Harvesting Cells in a Hollow Fiber Bioreactor System,” filed Oct. 7, 2011) and U.S. patent application Ser. No. 13/269,351 (“Customizable Methods and Systems of Growing and Harvesting Cells in a Hollow Fiber Bioreactor System,” filed Oct. 7, 2011), which applications are hereby incorporated by reference herein in their entireties for all that they teach and for all purposes.
Next,
The computing system 1000 may include a user interface 1002, a processing system 1004, and/or storage 1006. The user interface 1002 may include output device(s) 1008, and/or input device(s) 1010 as understood by a person of skill in the art. Output device(s) 1008 may include one or more touch screens, in which the touch screen may comprise a display area for providing one or more application windows. The touch screen may also be an input device 1010 that may receive and/or capture physical touch events from a user or operator, for example. The touch screen may comprise a liquid crystal display (LCD) having a capacitance structure that allows the processing system 1004 to deduce the location(s) of touch event(s), as understood by those of skill in the art. The processing system 1004 may then map the location of touch events to UI elements rendered in predetermined locations of an application window. The touch screen may also receive touch events through one or more other electronic structures, according to embodiments. Other output devices 1008 may include a printer, speaker, etc. Other input devices 1010 may include a keyboard, other touch input devices, mouse, voice input device, etc., as understood by a person of skill in the art.
Processing system 1004 may include a processing unit 1012 and/or a memory 1014, according to embodiments of the present disclosure. The processing unit 1012 may be a general purpose processor operable to execute instructions stored in memory 1014. Processing unit 1012 may include a single processor or multiple processors, according to embodiments. Further, in embodiments, each processor may be a multi-core processor having one or more cores to read and execute separate instructions. The processors may include general purpose processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), other integrated circuits, etc., as understood by a person of skill in the art.
The memory 1014 may include any short-term or long-term storage for data and/or processor executable instructions, according to embodiments. The memory 1014 may include, for example, Random Access Memory (RAM), Read-Only Memory (ROM), or Electrically Erasable Programmable Read-Only Memory (EEPROM), as understood by a person of skill in the art. Other storage media may include, for example, CD-ROM, tape, digital versatile disks (DVD) or other optical storage, tape, magnetic disk storage, magnetic tape, other magnetic storage devices, etc., as understood by a person of skill in the art.
Storage 1006 may be any long-term data storage device or component. Storage 1006 may include one or more of the systems described in conjunction with the memory 1014, according to embodiments. The storage 1006 may be permanent or removable. In embodiments, storage 1006 stores data generated or provided by the processing system 1004.
Results for some examples of protocols/methods/processes that may be used with a cell expansion system, such as CES 500 (
It is noted that the example protocols/methods/processes are provided for illustrative purposes and are not intended to limit other embodiments, which may include different or additional steps, parameters, or other features. The example protocols/methods/processes, including the steps (and any sub-steps), may be performed automatically in some embodiments, such as by a processor executing custom tasks or pre-programmed tasks stored in memory. In other embodiments, the steps (and any sub-steps) may be performed through the combination of automated and manual execution of operations. In further embodiments, the steps (and any sub-steps) may be performed by an operator(s) or user(s) or through other manual means.
Some examples provide example data from embodiments providing for the expansion of cells using various coating procedures, various cell loading procedures, various coating materials (e.g., cryoprecipitate (CPPT), fibronectin (FN)), and/or combination(s) of such procedures and/or materials. Such procedures include, for example: positive ultrafiltration coating procedure; positive ultrafiltration coating procedure with a bulls-eye (BE) cell load procedure; positive ultrafiltration coating procedure with a load cells with uniform suspension (LWUS) cell loading procedure; overnight coating with cryoprecipitate; overnight coating with fibronectin; bulls-eye coating procedure; 28-minute bulls-eye coating procedure; etc. Examples and further description of a bulls-eye coating procedure(s) are provided in U.S. patent application Ser. No. 15/616,745, entitled, “Coating a Bioreactor,” filed on Jun. 7, 2017, which claims priority to U.S. Provisional Application Ser. No. 62/347,012, entitled “Coating a Bioreactor,” and filed on Jun. 7, 2016. These applications are hereby incorporated by reference herein in their entireties for all that they teach and for all purposes. As described above, examples and further description of a bulls-eye cell loading procedure(s) are provided in U.S. patent application Ser. No. 14/542,276 (U.S. Pat. No. 9,617,506), entitled, “Expanding Cells in a Bioreactor,” issued on Apr. 11, 2017, which is hereby incorporated by reference herein in its entirety for all that it teaches and for all purposes.
Example results of expanding cells using a coating procedure(s) with, for example, the above methods 700, 800, 900, and/or 916 and/or with systems 500 (
For Donor 1 and Donor 2, 5E+6 MSC may be loaded into a bioreactor, e.g., bioreactor 501, 601, preconditioned with cell culture media comprised of αMEM+GlutaMAX (Gibco CAT #32561102) and 10% FBS (Hyclone CAT #5H30070.03). Donor 1 MSC may be cultured for 6.8 days and Donor 2 MSC may be cultured for 6.9 days. For Donor 1, n=1 (where n=number of machines or CESs, e.g., Quantum® Systems) for both overnight-coated and 10-minute ultrafiltration coated bioreactors. For Donor 2, n=1 for the overnight-coated CES, e.g., Quantum® System, and n=2 for the two 10-minute ultrafiltration coated CESs, e.g., Quantum® Systems.
Harvest yields for both Donor 1 Quantum® System runs with load with uniform suspension cell loading procedures may both be observed to be 1.93E+8 MSC. For example, overnight coating with load with uniform suspension cell loading procedure (LWUS) may yield 1.93E+8 MSC 1104; and 10-minute ultrafiltration coating with load with uniform suspension cell loading procedure (LWUS) may yield 1.93E+8 MSC 1108. To confirm efficacy of the 10-minute coating technique with other cell load protocols, an additional comparison may be made between Quantum® Systems loaded using the bulls-eye cell loading procedure (BullsEye Load). The Donor 1 MSC yield for the overnight coated with bulls-eye cell loading may be observed to be 2.23E+8 MSC 1112, and MSC yield for the 10-minute ultrafiltration coat with bulls-eye cell loading procedure (BullsEye Load) may be observed to be 2.15E+8 MSC 1116. The Donor 2 MSC expansion may be observed to yield 1.91E+8 MSC 1120 for the overnight coated Quantum® System (n=1) with load with uniform suspension cell loading procedure (LWUS), and 2.05E+8 MSC 1124 and 1.93E+8 MSC 1128, respectively, for the two runs of 10-minute ultrafiltration coated Quantum® Systems (n=2) with load with uniform suspension cell loading procedure (LWUS).
In other examples, fibronectin (FN) may be used as a coating agent with similar methods and systems as described above. Example results when using fibronectin include: cell yields for 10-minute ultrafiltration FN coated Quantum® Systems may be observed to be in the range of 40% to 50% of overnight-coated harvests for a substantially same cell load.
Example results of expanding cells by coating a cell growth surface of a cell expansion system, such as CES 500 (
As shown in graph 1200 of
These example yields are compared in
Example results of expanding cells by coating a cell growth surface of a cell expansion system, such as CES 500 (
These example yields are compared in
Although specific features may be described in the examples, such examples are provided merely for illustrative and descriptive purposes. For example, while such examples may provide for the expansion of MSCs, other cell types may be used in other embodiments. It is noted that the example data are provided for illustrative purposes and are not intended to limit other embodiments, which may include different steps, parameters, materials, or other features. The present embodiments are not limited to the examples provided herein.
The embodiments of the disclosure may have one or more aspects, including, for example: a method of applying an agent to a cell growth surface in a cell expansion system, the method comprising: loading the agent into the cell expansion system; conducting a first wash to push the agent into a circulation loop; and conducting a second wash to cause the agent to coat the cell growth surface by ultrafiltration.
One or more of the above aspects, wherein the agent comprises cryoprecipitate.
One or more of the above aspects, wherein conducting the first wash further comprises: pushing the agent from an air removal chamber into the circulation loop.
One or more of the above aspects, wherein the circulation loop comprises an intracapillary loop.
One or more of the above aspects, wherein the cell expansion system comprises a hollow fiber bioreactor, and wherein the hollow fiber bioreactor comprises a plurality of hollow fibers.
One or more of the above aspects, wherein each of the plurality of hollow fibers comprises the cell growth surface.
One or more of the above aspects, wherein the agent coats the cell growth surface in about 60 minutes or less.
One or more of the above aspects, wherein the agent is in solution with a fluid, wherein, during the second wash, the fluid is actively moved from an intracapillary (IC) side of the hollow fiber bioreactor to an extracapillary (EC) side of the hollow fiber bioreactor by closing an IC outlet valve and opening an EC outlet valve, wherein the agent remains on at least a portion of the plurality of the hollow fibers while the fluid is pushed to the EC side from the IC side.
One or more of the above aspects, wherein the agent is hydrostatically deposited onto an inner wall of the IC side of each of the plurality of hollow fibers.
One or more of the above aspects, wherein the agent coats the cell growth surface in about 10 minutes or less.
The embodiments of the disclosure may have one or more aspects, also including, for example: a cell expansion system comprising: a bioreactor, wherein the bioreactor comprises a hollow fiber membrane; a first fluid flow path having at least opposing ends, wherein the first fluid flow path is fluidly associated with an intracapillary portion of the hollow fiber membrane; a processor; a memory, in communication with and readable by the processor, and containing a series of instructions that, when executed by the processor, cause the processor to: close a first outlet of the cell expansion system associated with the intracapillary portion of the hollow fiber membrane; load a coating solution into the cell expansion system, wherein the coating solution comprises a coating agent and a first fluid; and increase an inlet flow of a second fluid into the intracapillary portion of the hollow fiber membrane to push the first fluid through the intracapillary portion to the extracapillary portion of the hollow fiber membrane, wherein the coating agent coats a surface of the hollow fiber membrane.
One or more of the above aspects, wherein the memory further contains an instruction that, when executed by the processor, causes the processor to: open a second outlet of a second fluid path associated with the extracapillary portion of the hollow fiber membrane.
One or more of the above aspects, wherein the hollow fiber membrane comprises a cell growth surface, and wherein the coating agent coats the cell growth surface.
One or more of the above aspects, wherein the coating agent coats the cell growth surface through ultrafiltration.
One or more of the above aspects, wherein the coating occurs in less than about 60 minutes.
One or more of the above aspects, wherein the second fluid path is fluidly associated with an extracapillary circulation loop.
One or more of the above aspects, wherein the coating solution comprises cryoprecipitate and phosphate buffered saline.
One or more of the above aspects, wherein the memory further contains an instruction that, when executed by the processor, causes the processor to: set a stop condition for the inlet flow of the second fluid.
One or more of the above aspects, wherein the stop condition comprises a time period.
The embodiments of the disclosure may have one or more aspects, also including, for example: a method for rapidly coating a cell growth surface in a cell expansion system, the method comprising: priming the cell expansion system, wherein the cell expansion system comprises: a bioreactor, wherein the bioreactor comprises: a hollow fiber membrane having an intracapillary portion and an extracapillary portion, wherein the hollow fiber membrane comprises a plurality of hollow fibers, the plurality of hollow fibers comprising a cell growth surface; a first fluid flow path having a first inlet and a first outlet at at least opposing ends of the bioreactor, wherein the first fluid flow path is fluidly associated with the intracapillary portion of the hollow fiber membrane; a second fluid flow path having a second inlet and a second outlet, wherein the second fluid flow path is fluidly associated with the extracapillary portion of the hollow fiber membrane; a first connection port fluidly associated with the first fluid flow path; a first outlet valve fluidly associated with the first fluid flow path; a second outlet valve fluidly associated with the second fluid flow path; and a harvest bag; connecting a first bag containing a reagent for coating the cell growth surface of the plurality of hollow fibers; closing the first outlet valve; opening the second outlet valve; coating, through ultrafiltration, the cell growth surface with the reagent; connecting a second bag to the first connection port to introduce cells to the bioreactor; feeding the cells; connecting the harvest bag to the first fluid flow path to harvest the cells; and harvesting the cells into the harvest bag.
Embodiments further include one or more means for conducting the one or more above aspects.
Embodiments further include a system on chip, processor, application specific integrated circuit, field programmable gate array, or other control for executing the one or more above aspects.
While embodiments and examples have been illustrated and described, it is to be understood that the embodiments and examples are not limited to the precise configuration(s) and/or resource(s) described above. Various modifications, changes, and variations apparent to those skilled in the art may be made in the arrangement, operation, and details of the methods and systems of the present embodiments and examples disclosed herein without departing from the scope of the present claims.
As used herein, “at least one,” “one or more,” and “and/or” are open-ended expressions that are both conjunctive and disjunctive in operation. For example, each of the expressions “at least one of A, B and C,” “at least one of A, B, or C,” “one or more of A, B, and C,” “one or more of A, B, or C” and “A, B, and/or C” can mean A alone, B alone, C alone, A and B together, A and C together, B and C together, or A, B and C together.
It will be apparent to those skilled in the art that various modifications and variations may be made to the methods and structure of the present embodiments without departing from the scope of the claims. Thus, it should be understood that the embodiments are not to be limited to the specific examples given. Rather, the embodiments are intended to cover modifications and variations within the scope of the following claims and their equivalents.
This application claims priority to, and the benefit of, U.S. Provisional Application Ser. No. 62/347,025, filed on Jun. 7, 2016, and entitled, “Growth Surface Coating.” The disclosure of the above-identified application is hereby incorporated by reference in its entirety as if set forth herein in full for all that it teaches and for all purposes.
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| Number | Date | Country | |
|---|---|---|---|
| 20170349869 A1 | Dec 2017 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62347025 | Jun 2016 | US |
