Patent Grant
11957733
The present technology relates to methods of stimulating chondrocytes at the site of a collagen defect in mammalian subjects. In particular, methods comprise use of solutions comprising cytokines, including such solutions derived from blood and other tissues.
Chondrocytes are cells that produce and maintain the cartilaginous matrix that comprises cartilage. Collagen is the most abundant protein in mammals, and is present in a variety of tissues, including skin, connective tissue, cartilage, bone, blood vessels and intervertebral disks. There are a variety of collagen-related disorders, resulting from disease as well as trauma to tissues comprising collagen. Diseases may result from genetic defects or nutritional deficiencies that affect the production of collagen by chondrocytes. Some collagen disorders as associated with autoimmune diseases, such as rheumatoid arthritis, lupus, and systemic sclerosis, which destroy collagen after it is produced. Such diseases may be debilitating and painful.
Cartilage is composed of collagen fibers. Thus, collagen disorders may affect the composition and function of cartilage in joints and other tissue structures. Cartilage defects can appear as a hole or a tear in a cartilage surface and can result from wear, trauma or disease. Since cartilage has minimal ability to repair itself, even a small cartilage defect, if left untreated, can hinder the ability of a human or other mammal to move free from pain and can cause deterioration of a joint surface. Traditional treatments for cartilage defects include trimming the defect from the surface of the cartilage using arthroscopic surgery, or repairing the defect with sutures. More recently, treatments for cartilage defects have included the harvesting of cartilage cells, which are then cultured and implanted back into the cartilage defect to regenerate cartilage.
However, many such treatments may present side effects, and may have limited long term utility as underlying conditions become worse. Accordingly, there remains a need to develop novel therapies for the treatment of cartilage and other collagen defects, particularly therapies that improve efficacy and have reduced side effects.
The present technology provides methods and therapeutic compositions for the stimulation of collagen production, including stimulation of chondrocyte production. Methods include stimulating chondrocyte production at a site of a collagen defect in a mammalian subject, comprising administering to the site a blood-derived composition comprising at least two proteins selected from the group consisting of IL-1ra, sTNF-RI, sTNF-RII, IGF-I, EGF, HGF, PDGF-AB, PDGF-BB, VEGF, TGF-β1, and sIL-1RII, wherein the concentration of each protein in the composition is greater than the concentration of the protein in normal blood. For example, compositions may comprise
The present technology also provides methods for making compositions for stimulating chondrocyte product in a mammalian subject, comprising:
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings. It should be noted that the figures set forth herein are intended to exemplify the general characteristics of materials, compositions, devices, and methods among those of the present technology, for the purpose of the description of certain embodiments. These figures may not precisely reflect the characteristics of any given embodiment, and are not necessarily intended to fully define or limit specific embodiments within the scope of this technology.
The following description of technology is merely exemplary in nature of the composition, manufacture and use of one or more inventions, and is not intended to limit the scope, application, or uses of any specific invention claimed in this application or in such other applications as may be filed claiming priority to this application, or patents issuing therefrom. A non-limiting discussion of terms and phrases intended to aid understanding of the present technology is provided at the end of this Detailed Description.
The present technology relates to methods for stimulating collagen production, such as by stimulating chondrocyte production, using compositions comprising cytokines, for example, interleukin-1 receptor antagonist protein (IL1-ra) and tumor necrosis factor-alfa. In various embodiments, methods for stimulating collagen defect in a human or other mammalian subject, comprise:
The present technology provides methods for stimulating chondrocyte production in humans or other mammalian subjects using compositions (herein referred to as “Protein Solutions”) comprising proteins dissolved, suspended or otherwise carried for delivery to a mammalian subject in a physiologically-acceptable medium. In various embodiments, such compositions comprise proteins (e.g., cytokines) that are native to whole blood in normal mammal subjects. Such compositions may also contain viable cells, including platelets, cytokine-producing cells, and combinations thereof.
In various embodiments, the Protein Solution comprises at least two proteins selected from the group consisting of IL-1ra (interleukin-1 receptor antagonist), sTNF-RI, sTNF-RII (soluble tumor necrosis factor-receptor 2), IGF-I (insulin-like growth factor 1). EGF (epidermal growth factor), HGF (hepatocyte growth factor), PDGF-AB (platelet-derived growth factor AB), PDGF-BB (platelet-derived growth factor BB), VEGF (vascular endothelial growth factor), TGF-β1 (transforming growth factor-β1, and sIL-1RII (soluble interleukin 1 receptor II), wherein the concentration of each protein in the composition is greater than the concentration of the protein in normal blood. While the concentration of every such protein in the composition may be greater than its respective concentrations in normal blood, it is not necessary that the concentration of more than two of the proteins be greater than their respective concentrations in normal blood.
In various embodiments, a Protein Solution comprises the following components.
Protein concentrations can be measured using the methods set forth in Example 4.
The composition further preferably comprises viable cytokine-producing cells, lysed cytokine-producing cells, or both. In a preferred composition, the Protein Solution comprises monocytes, granulocytes, and platelets. In various embodiments, a Protein Solution comprises the following components.
It will be understood that this concentration is species specific. Further, it is understood that concentrations may vary among individual subjects. Thus, in methods comprising production of a Protein Solution from the blood or other tissue containing cytokine-producing cells, the concentration of proteins and cells in the Protein Solution may vary from those recited above; the values recited above are mean values for concentrations as may be seen in a population of subjects.
In various embodiments, the concentration of one or more of the proteins or other components in the Protein Solution is greater than the concentration of the component in normal blood. (Compositions with such higher concentrations of components are said to be “rich” in such components.) As referred to herein, the concentration of a component in “normal” blood or other tissue is the concentration found in the general population of mammalian subjects from which the tissue is obtained, e.g., in normal whole blood. In methods wherein the anti-inflammatory cytokine composition is derived from tissue from a specific subject, the “normal” concentration of a protein or cell may be the concentration in the blood of that individual before processing is performed to derive the protein or cell.
Thus, in various embodiments, the concentration of one or more components of the Protein Solution is greater than about 1.5 times, about 2 times, or about 3 times, greater than the concentration of the component in normal blood. For example, components may have greater concentrations in the compositions, relative to normal (whole) blood, as follows:
For example, a Protein Solution may comprise:
In some embodiments, the concentration of IL-1ra in the Protein Solution is preferably at least 5,000, or at least 10,000, times greater than the concentration of interleukin-1α in the Protein Solution. The ratio of IL-1ra:interleukin-1β (IL-1β) concentrations is preferably at least 100. In some embodiments, the concentration of IL-1ra in the Protein Solution is preferably at least 1500, or at least 8000, times greater than the concentration of IL-1β in the Protein Solution. The ratio of sIL-1RII:interleukin-1β (IL-1β) concentrations is preferably greater than 1. In some embodiments, the sIL-1RII in the Protein Solution is preferably at least 2000, or at least 45000, times greater the concentration of interleukin-1β in the Protein Solution.
Protein Solutions may be made by any of a variety of methods, including admixture of individual components and processes wherein one or more components are derived from a source material. In various embodiments, the Protein Solution is made by fractionating a cytokine cell suspension, to produce a protein solution comprising IL1-ra.
Obtaining Protein Solutions by Contacting Cytokine-Producing Cells with an Extraction Material
In various embodiments, Protein Solutions are made by derivation of one or more components from tissue comprising cytokine-producing cells. As referred to herein, a “cytokine producing tissue” is a tissue obtained from a mammalian subject, comprising cells that are capable of producing cytokines. Such cells include cytokine-producing cells, adipose stromal cells, bone marrow stromal cells, and combinations thereof. It is understood that cytokine-producing cells include monocytes, lymphocytes, and granulocytes such as neutrophils, eosinophils, and basophils. White blood cell useful in the methods of this technology preferably include monocytes and neutrophils. Cytokine producing tissues among those useful herein include blood, adipose tissue, bone marrow, and fractions thereof, as further discussed below.
Blood useful herein includes whole blood, plasma, platelet-rich plasma, platelet-poor plasma, and blot clots. In a preferred embodiment, methods of the present technology use platelet-rich plasma (PRP), containing cytokine-producing cells and platelets, comprising the buffy coat layer created by sedimentation of whole blood. Adipose tissue useful herein includes any fat tissue, including white and brown adipose tissue, which may be derived from subcutaneous, omental/visceral, mammary, gonadal, or other adipose tissue sites. Bone marrow useful herein includes red marrow and yellow marrow. In a preferred embodiment, bone marrow is bone marrow concentrate, obtained from the red marrow of long bones, comprising hematopoietic and mesenchymal stems cells. As discussed above, blood, adipose, and bone marrow tissue useful herein may be from either autologous or allogeneic sources, relative to the subject to be treated according to methods of this technology. Compositions may also be made from combinations of allogeneic and autologous tissues.
In some embodiments, methods comprise fractionating a liquid (a “cytokine cell suspension.”) comprising cells capable of producing cytokines, such as IL1-ra and sTNF-R1. As discussed above, such cells include cytokine-producing cells, adipose stromal cells, bone marrow stromal cells, and combinations thereof. In some embodiments, the cytokine cell suspension is a liquid comprising cytokine-producing cells. It should be understood that the cytokine cell suspension comprises cells and an extra-cellular liquid, regardless of the relative proportions of the cells and liquid. In some embodiments, the suspension may comprise primarily cells, with liquid being present as only a minor component, essentially wetting the cells. In some embodiments, the liquid may comprise two phases, consisting of a phase primarily consisting of liquid and a phase primarily consisting of cells, forming a suspension of cells in the liquid only upon agitation or other mixing.
In some embodiments, fractionating a cytokine cell suspension comprises contacting the liquid with a solid extraction material. As exemplified in
In various embodiments, obtaining comprises isolating a cytokine cell suspension, comprising cytokine-producing cells or other cytokine-producing cells, from blood, adipose tissue, bone marrow aspirate or other tissue comprising cytokine-producing cells, as exemplified in Steps 110, 120 and 125 of
Obtaining a Liquid Containing Cytokine-Producing Cells from Blood
In embodiments comprising the use of blood, the blood may be used directly in contacting the solid extraction material, as exemplified in step 140 of
In various embodiments, methods of the present technology comprise creating PRP as the cytokine cell suspension, using centrifugation. Such methods generally comprise placing blood in a container a separator operable to separate the blood into two or more fractions, and centrifuging the separator to create a platelet-rich plasma fraction. Such devices may include a tube and a buoy disposed in the tube, wherein the buoy has a density such that the buoy reaches an equilibrium position upon centrifugation of the tissue in the tube, the equilibrium position being between a first fraction and a second fraction comprising cytokine-producing cells, the second fraction having a concentration of cytokine-producing cells greater than the concentration of cytokine-producing cells in the first fraction. Such methods further comprise centrifuging the tube so that the buoy defines an interface between the first fraction and the second fraction comprising cytokine-producing cells. The second fraction is then collected for further use in the methods of this technology.
One such device useful herein is described in U.S. Pat. No. 7,992,725, Leach et al., issued Aug. 9, 2011. Such a device is commercially available as GPS III Platelet Concentrate and Separation System, from Biomet Biologics, LLC (Warsaw, Indiana, USA). The device can be used in a clinical or laboratory environment to isolate fractions from a suspension or multi-component tissue material obtained from a subject, such as blood, bone marrow aspirate, cerebrospinal fluid, adipose tissue, Isolated fractions can include platelets, platelet poor plasma, platelet rich plasma and stromal cells. The isolated fractions can each have equilibrium point or positions within the separation container that are achieved when separation has occurred. For example, a buffy coat (PRP) of whole blood may have an equilibrium position above that of the red blood cells when a sample of whole blood is separated.
The fractionation device 200 is exemplified in
The buoy 210 is carried in the separation container 205 and has a tuned density that is configured to reach a selected equilibrium position in a suspension. The buoy can have its density tuned in the range from about 1.0 g/cc to about 1.10 g/cc, such as about 1.06 g/cc. The buoy 210, according to various embodiments, can be formed to include the tuned density and can be formed of one or more materials to achieve the tuned density.
Referring to
In some embodiments, the buoy 210 can comprise a collection port 240. The collection port 240 communicates with access port 245 and communicates with a collection space 220 above buoy upper surface 250 and can be located near the buoy perimeter 210a. In some embodiments, the collection port 240 is not carried on the buoy, but rather the collection port is a withdraw device such as a syringe that is inserted through an access port or top of the device 200.
According to various embodiments, an isolator 255, is coupled to the buoy 210. The combination of the isolator and buoy, according to various embodiments, can also be referred to as a separation assembly member. The isolator 255, for example, provides a means for creating the collection compartment 220 and comprises one or more spacers 260, 265 to position the isolator 255 apart from the buoy 210 to create the collection compartment 220. A withdraw port 270 can be carried on the isolator 255 communicating with the withdraw port 245 and the collection port 240. The spacer 260, 265 can also serve as a conduit 275 between the collection port 50 and a withdraw or withdraw port 245. The withdraw port 245 serves as a structure for withdrawing the isolated or second fraction 310 from the collection compartment 220.
After centrifuging the device 200 containing whole blood, the first fraction or top fraction 230, can be platelet-poor-plasma, the middle fraction 225 can be platelet-rich plasma or platelet concentrate, and a bottom fraction 278 can be red blood cells. Therefore, the fractionation method further comprises withdrawing a desired fraction from the device 200. Various ports 205, 245 and 280 can be provided to allow access to any appropriate compartment of the device 200. The access ports 205, 245, 280 can be any means that allow communication from outside the separation device 200 to the device's interior, such as a Luer lock port, a septum, a valve, or other opening. Additionally, collection vent tube 285 allows removal of a fractionated suspension in the collection area 220 through opening 290 without the need to remove the fraction, such as plasma, above the isolator 255. Although, without a collection vent tube 285, the fraction above the isolator could be removed and the collection area could be vented to the area above the isolator.
A method for using the fractionation device 200 can begin by inputting whole blood via an access port 205. The fractionation device 200 is placed into a centrifuge and spun for a period that is appropriate for fractionating whole blood. An exemplary period can be for about five minutes to about twenty minutes at a rate of about 320 rpm to about 5000 rpm. This speed may produce a selected gravity that may be approximately 7.17×g to about 1750×g (times greater than the normal force of gravity).
Other devices that may be used to isolate platelet-rich plasma described, for example, in U.S. Pat. No. 5,585,007, Antanavich, issued Dec. 17, 1996; U.S. Pat. No. 6,398,972. Blasetti et al., issued Jun. 4, 2002; U.S. Pat. No. 6,649,072, Brandt et al., issued Nov. 18, 2003; U.S. Pat. No. 6,790,371, Dolocek, issued Sep. 14, 2004; U.S. Pat. No. 7,011,852, Sukavaneshvar et al., issued Mar. 14, 2006; U.S. Pat. No. 7,179,391, Leach et al., issued Feb. 20, 2007; U.S. Pat. No. 7,374,678, Leach et al., issued May 20, 2008; U.S. Pat. No. 7,223,346. Dorian et al., issued May 29, 2007; and U.S. Pat. No. 7,708,152, Dorian et al., issued May 4, 2010.
In addition to the GPS® Platelet Concentrate and Separation Systems, a variety of other commercially available devices may be used to isolate platelet-rich plasma, including the Magellan™ Autologous Platelet Separator System, commercially available from Medtronic, Inc. (Minneapolis, Minnesota, USA); SmartPReP™, commercially available from Harvest Technologies Corporation (Plymouth, Massachusetts, USA); the AutoloGel™ Process, commercially available from Cytomedix, Inc. (Rockville, Maryland, USA); the GenesisCS System, commercially available from EmCyte Corporation (Fort Myers, Florida, USA); and the PCCS System, commercially available from Biomet 3i, Inc. (Palm Beach Gardens, Florida, USA); and the Arthrex ACP™ Double Syringe System, commercially available from Arthrex, Inc. (Naples, Florida, USA).
Referring again to
A liquid containing cytokine-producing cells may be prepared by admixing cells with a suitable liquid, as shown in step 125, using methods known in the art. For example, cytokine-producing cells may be isolated from whole blood by lysing red blood cells or by centrifugation of whole blood utilizing a density gradient where the cytokine-producing cells sediment to the bottom of a centrifuge tube. An example of density centrifugation includes the Ficoll-Paque™ Plus (GE Healthcare Bio-Sciences, Piscataway, New Jersey, USA). In some cases, a density gradient may be used to further separate mononuclear and polymorphonuclear cells. Cytokine-producing cells may also be prepared from whole blood using filtration; an example includes the Acelere™ MNC Harvest System (Pall Life Sciences, Ann Arbor, Michigan, USA). Cytokine-producing cells can also be obtained from bone marrow. The cytokine-producing cells may be then suspended in a suitable medium, such as plasma, so as to maintain their viability.
Other methods may be used to create platelet-rich plasma or other liquid containing cytokine-producing cells. For example, whole blood can be centrifuged without using a buoy system, whole blood may be centrifuged in multiple stages, continuous-flow centrifugation can be used, and filtration can also be used. In addition, a blood component including platelet-rich plasma can be produced by separating plasma from red blood cells using a slow speed centrifugation step to prevent pelleting of the platelets. In other embodiments, the buffy coat fraction formed from centrifuged blood can be separated from remaining plasma and re-suspended to form platelet-rich plasma.
Obtaining a Cytokine Cell Suspension from Adipose Tissue
In embodiments comprising the use of adipose tissue, the adipose tissue may be used directly in contacting the solid extraction material, as exemplified in step 140 of
For example, adipose tissue can be collected by suction-assisted tumescent liposuction inside a specialized collection container attached to suction hoses and to a liposuction cannula. The collection container can have a gauze-type grid filter that allows the tumescent fluid to pass through and retains the solid adipose tissue. After collecting the adipose tissue, the collection container is removed from the suction device and reattached to a centrifugation device. The filter unit may further contain a filter having approximately a 100 micrometer pore size. Once the collection container containing the adipose tissue is attached to the centrifugation device, the tissue is sonicated. After sonication, the entire apparatus is inserted into a centrifuge bucket and centrifuged at, for example, 300×g for 5 minutes. After centrifugation, the collection container together with the filter unit is detached and can be discarded. The pellet containing the stromal cells can then be re-suspended in biocompatible solutions, such as plasma, plasma concentrate and platelet-rich plasma.
Various methods and devices for isolating and/or fractionating adipose tissue and adipocytes include those as described by U.S. Pat. No. 7,374,678, Leach, issued May 20, 2008; U.S. Pat. No. 7,179,391 to Leach et al., issued Feb. 20, 2007; U.S. Pat. No. 7,992,725, Leach et al., issued Aug. 9, 2011; U.S. Pat. No. 7,806,276, Leach et al., issued Oct. 5, 2010; and U.S. Pat. No. 8,048,297, Leach et al., issued Nov. 1, 2011. A device, such as the GPS™ Platelet Concentrate System, commercially available from Biomet Biologics, LLC (Warsaw, Indiana, USA), may be used to isolate adipocytes.
Obtaining a Liquid Containing Cytokine-Producing Cells from Bone Marrow
In embodiments comprising the use of bone marrow, the marrow may be used directly in contacting the solid extraction material, as exemplified in step 140 of
An exemplary process for isolating and creating a bone marrow concentrate (cBMA) is diagrammed in
Once a selected volume of the BMA is obtained in step 605, it may be separated and concentrated using a gravimetric separator. Separators among those useful herein are operable to separate a multi-component fluid that generally includes various components or constituents of varying densities that are commingled or mixed together, including those described above for separation of fractions from blood and adipose tissue. The separator may include a buoy that is of a selected density relative to BMA. Such separators include those described above for use in concentrating and isolating fractions from blood and adipose tissue, including those described in U.S. Pat. No. 7,374,678. Leach, issued May 20, 2008; U.S. Pat. No. 7,179,391 to Leach et al., issued Feb. 20, 2007; U.S. Pat. No. 7,992,725, Leach et al., issued Aug. 9, 2011; U.S. Pat. No. 7,806,276, Leach et al., issued Oct. 5, 2010; and U.S. Pat. No. 8,048,297, Leach et al., issued Nov. 1, 2011. A device, such as the GPS™ Platelet Concentrate System, commercially available from Biomet Biologics, LLC (Warsaw, Indiana, USA), may be used to isolate adipocytes. Separators and methods that may be used to fractionate BMA at steps 610 and 615 are also described, for example, in U.S. Application Publication No. 2006/0278588, Woodell-May, published Dec. 14, 2006. The BMA may be positioned in a separator according to various embodiments in step 610. Once the BMA is positioned in the separator, a selected fraction of the BMA may be separated from the BMA in step 615.
Once the BMA is placed in the separator, separator is spun in a centrifuge in a range between about 1,000 and about 8,000 RPM. This produces a force between about 65 and about 4500 times greater than the force of normal gravity, as generally calculated in the art, on the separator and the BMA. At this force, the more dense material in a BMA sample is forced toward the bottom end of the tube. The separator can thus be used to remove nucleated cells from the bone marrow sample. In various embodiments, concentrated BMA has a concentration of nucleated cells that is at least 2, at least 3, at least 4, or at least 5 times the concentration of nucleated cells in BMA.
Obtaining a Liquid Containing Cytokine-Producing Cells from Blood Clots
In other embodiments comprising the use of blood, a liquid comprising cytokine-producing cells may trapped in a blood clot. Cell releasate can be generated from the blood clot by either compression (“squeezing”), clot disruption, or centrifugation. The blood clot can be made with or without anticoagulant and with or without exogenous thrombin by combining blood or a blood fraction with a clotting agent. Suitable clotting agents include thrombin (e.g., bovine, recombinant human, pooled human, or autologous), autologous clotting protein, and polyethylene glycol. Calcium may be in the form of a calcium salt, such as calcium chloride.
In some embodiments, the clotting agent comprises a clotting protein, which may be a clotting fraction derived from a blood obtained from the patient to be treated. A suitable clotting fraction can be obtained by a process of: loading whole blood or plasma with a calcium solution (e.g., calcium chloride in ethanol) into a blood isolation device; optionally heating the whole blood or plasma for at least about 20 minutes, at a temperature of at least about 20° C.; and isolating the clotting fraction. The isolating may be performed by centrifuging the heated whole blood or plasma. A suitable isolation device is commercially available as the Clotalyst™ Autologous Thrombin Collection System (hereinafter “Clotalyst System”), sold by Biomet Biologics LLC, Warsaw, Indiana, USA.
An exemplary procedure for producing a clotting agent using a device 400 of
The contents of the blood component separation device 400 are mixed by repeatedly inverting the device 400, e.g. about twelve times, so as to contact the blood with the glass beads. After mixing, the device is incubated The incubation process can be at a temperature and for a duration that will permit the contents of the device 400 to be heated at about 25° C. for about 15 minutes. Upon completion of the incubation period, a clotted mass of red blood cells, blood plasma, and glass beads forms at a second end 406 of the main chamber 405. After incubation is complete, the device 400 is shaken enough to dislodge and break-up any gel that may be present.
Obtaining a Liquid Containing Cytokine-Producing Cells Using Non-Centrifugal Methods
As noted above, the liquid containing cytokine-producing cells can be obtained by non-centrifugal means, such as by culturing. As referred to herein, a “non-centrifugal method” comprises a process for obtaining tissue fractions comprising cytokine-producing cells from tissue without use of a centrifuge. In some embodiments, methods are “non-gravimetric,” wherein, based on physical, chemical or physicochemical properties of the cells other than density, wherein the concentration of white blood cells in the fraction are higher than the concentration of white blood cells in the tissue. Such non-gravimetric methods are, in particular, distinguished from methods wherein a white blood cell fraction is created by centrifugation of whole blood or other tissue. In some embodiments, the non-centrifugal method comprises a process solely based on such properties of white blood cells other than density. Non-centrifugal methods include filtration, antibody binding, and electrophoretic methods.
For example, as discussed above, cytokine-producing cells may be prepared from whole blood, bone marrow aspirate or other tissue, using filtration. Cytokine-producing cells and other cytokine-producing cells obtained from blood, bone marrow, adipose tissue or other sources may also be cultured, using methods among those known in the art. The cells may be then suspended in a suitable medium, such as plasma, so as to maintain their viability and facilitate mixing or other contact with a solid extraction material. A liquid containing the cells may also be produced by compression or disruption of blood clots, as described above.
Contacting a Liquid Cytokine Cell Suspension with an Extraction Material and Isolating a Protein Solution
In further reference to the exemplified process of
The solid extraction material can include various materials that provide a particular surface area to contact the cells. The solid extraction material may be a continuous material or may be discontinuous and comprise a plurality of separate particles. For example, the solid extraction material may be in the form of a plurality of beads, fibers, powder, a porous material, or a surface of a container comprising the liquid containing the cells. The solid extraction material may comprise geometric forms having various cross-sectional shapes, such as spherical, oval, or polygonal, among others. The solid extraction material can also comprise a continuous porous network, similar to a sponge, or can include a plurality of individual porous particles. The solid extraction material may also provide a larger surface area by being porous in comparison to a non-porous material.
In some embodiments, the solid extraction material includes particles having a large aspect ratio, for example, where the particles are needle-like in shape. The solid extraction material may also be formed as long fibers and may be or take a form similar to glass wool.
In some cases, the solid extraction material can comprise the internal walls of a container holding the cytokine cell suspension. For example, the solid extraction material may comprise the lumen of a syringe that contains the cytokine cell suspension. Other containers include tubes, such as centrifuge tubes, or a blood fractionation device or concentrator assembly as described elsewhere herein.
Where the solid extraction material is a continuous material, such as a porous sponge-like material, the solid extraction material can be used in an amount sufficient to absorb or adsorb or include substantially the entire liquid volume of cytokine-producing cells within the pores or interstices of the solid extraction material. Where the solid extraction material is a discontinuous material, such as a plurality of particles, the solid extraction material can be combined with the liquid containing the cells to form a slurry-like composition. The slurry can vary in consistency from paste-like, having a high-solids fraction, to a readily flowable slurry having a low-solids fraction.
The solid extraction material can provide a large surface area with which to contact the cells. However, in some cases, the solid extraction material can be further treated to increase its surface area, for example, by physically or chemically etching or eroding the surface of the solid extraction material. With respect to chemical etching, a corrosive agent can be used to modify the surface of the solid extraction material depending on the nature of the material. The modified surface may be produced by employing an alkali or an acid, for example chromosulphonic acid, in particular about 20% to about 80% in strength, preferably about 50% chromosulphonic acid. The solid extraction material can be incubated with the corrosive agent for about 5 min to about 30 min in order to chemically etch the surface and increase the surface area. The solid extraction material can then be washed to remove the corrosive agent. For example, the solid extraction material can include the internal walls of a container for holding the cytokine cell suspension where the internal walls are etched to subsequently increase the surface area in contact with the liquid.
Various polymers, metals, ceramics, and glasses can be used as the solid extraction material. In some embodiments, the solid extraction material comprises a hygroscopic material. Examples of suitable solid extraction material materials include glasses, minerals, polymers, metals, and polysaccharides. Minerals include corundum and quartz. Polymers include polystyrene, polyethylene, polyvinyl chloride, polypropylene, and polyacrylamide. Metals include titanium. Polysaccharides include dextran and agarose. A preferred solid extraction material comprises, or consists essentially of, polyacrylamide, as further described below.
The solid extraction material may comprise, for example, continuous solid extraction material of glass or a plurality of glass particles, glass wool, a continuous solid extraction material of metal such as titanium, a plurality of metal beads, metal powder, and combinations thereof. A continuous solid extraction material of metal can include a block or other three-dimensional shape formed of porous metal or metal alloys with an open cell structure. The solid extraction material may include various beads or particles of various sizes including substantially spherical beads. Beads include polystyrene beads, polyacrylamide beads, glass beads, metal (e.g., titanium) beads, or any other appropriate beads. Beads may be any size appropriate for the container and the amount of cytokine cell suspension being used. In some instances, bead sizes can range from about 0.001 millimeters to about 3 millimeters in diameter. Where the bead size is sufficiently small, the beads can appear more like a powder.
Polyacrylamide beads used as the solid extraction material can be formed by polymerizing acrylamide monomer using controlled and standardized protocols as known in the art to produce relatively uniform beads formed of polyacrylamide gel. In general, polyacrylamide is formed by polymerizing acrylamide with a suitable bifunctional crosslinking agent, most commonly N,N′-methylenebisacrylamide (bisacrylamide). Gel polymerization is usually initiated with ammonium persulfate and the reaction rate is accelerated by the addition of a catalyst, such as N,N,N′,N′-tetramethylethylenediamine (TEMED). In various embodiments, polyacrylamide beads comprise 0.5 micromole of carboxyl groups per milliliter of beads, imparting a slight anionic character (negative charge). The beads are also typically resistant to changes in pH, and are stable in many aqueous and organic solutions. By adjusting the total acrylamide concentration, the polyacrylamide gel can be formed in a wide range of pore sizes. Moreover, the polyacrylamide beads can be formed in many sizes and can have relatively uniform size distributions. Bead size may range from several micrometers in diameter to several millimeters in diameter. For example, various types of Bio-Gel™ P polyacrylamide gel beads (Bio-Rad Laboratories, Hercules, California, USA) have particle sizes ranging from less than about 45 μm up to about 180 μm. Polyacrylamide beads are also available from SNF Floerger (Riceboro, Georgia, USA), Pierce Biotechnology, Inc. (Rockford, Illinois, USA), and Polymers, Inc. (Fayetteville, Arkansas, USA).
Once polymerized, polyacrylamide beads can be dried and stored in a powder-like form. The dry beads are insoluble in water but can swell considerably upon being rehydrated. Rehydration returns the polyacrylamide beads to a gel consistency that can be from about two to about three times the dry state size. Thus, dry polyacrylamide beads (i.e., desiccating polyacrylamide beads) may be used to absorb a portion of a liquid volume, including solutes smaller than the bead pore size, and can serve to concentrate IL-1ra and other proteins produced by the cytokine-producing cells. For example, combining dry polyacrylamide beads with the blood and/or platelet-rich plasma in step 230 activates production of IL-1ra by the cytokine-producing cells and also reduces the total liquid volume as the dry beads rehydrate and swell.
Without limiting the scope, mechanism or function of the present technology, it has been discovered that surface contact with the solid extraction material can activate the cells and the solid extraction material can, in some cases, assist in the separation and concentration of the resulting Protein Solution rich in cytokines, including IL-1ra. For example, in the case of a porous solid extraction material, a portion of the liquid comprising the cells can enter the pores and remain therein. Cells in the liquid may contact this additional surface area. In some embodiments, the pores are too small for the cells to enter, but a portion of the liquid can enter the pores. Liquid can be removed from the solid extraction material and pores by centrifuging, for example.
The solid extraction material is preferably sterilized, using techniques among known in the art, in order to prevent contamination of the cytokine cell suspension. For example, heat and pressure sterilization methods, such as autoclaving, may be used depending on the particular composition of the solid extraction material. Alternative methods, such as chemical sterilization or irradiation, can be used where the solid extraction material may be adversely affected by the autoclaving process.
In some embodiments, the cytokine cell suspension is incubated with solid extraction material for a time effective to remove a portion of the liquid. The incubation may be carried out over a period from about 30 seconds to about 72 hours and may be carried out at a temperature from about 20° C. to about 41° C. For example, the incubation may be 24 hours or less, 10 hours or less, 5 hours or less, 2 hours or less, 1 hour or less, 30 minutes or less, 15 minutes or less 10 minutes or less, 5 minutes or less, 4 minutes or less, 3, minutes or less, or 2 minutes or less. Incubation may be at least about 15 seconds, at least about 30 seconds, at least about 1 minutes, at least about 90 seconds, at least about 2 minutes, at least about 10 minutes, or at least about 30 minutes. In some embodiments, incubation s from about 1 minute to about 3 minutes. In some embodiments the liquid is not incubated, but is contacted with the solid extraction material for only so long as necessary to perform subsequent processing. The contacting may occur at ambient conditions, e.g., at a temperature of about 20-25° C.
In some embodiments, the cytokine cell suspension and the solid extraction material are agitated to more thoroughly mix these components during contact. The agitation may be accomplished by inverting, shaking, rocking, stirring, or vortexing the liquid and solid extraction material. Agitation may increase contact of the cells within the liquid with the solid extraction material. Agitation may be performed once, repeated multiple times, repeated periodically, or may be continuous. The liquid comprising the cells and the solid extraction material may also be agitated while the liquid is stimulated with the electromagnetic field. Additional aspects and features relating to producing protein-rich solutions using polyacrylamide beads and other solid extraction materials are described in: U.S. Patent Application Publication No. 2009/0220482, Higgins et al., published Sep. 3, 2009; U.S. Patent Application Publication No. 2010/0055087, Higgins et al., published Mar. 4, 2010; U.S. Patent Application Publication 2011/0052561, Hoeppner, published Mar. 3, 2011; International Application Publication 2012/030593, Higgins et al., published Mar. 8, 2012; and U.S. Patent Application Publication 2012/0172836, Higgins et al., published Jul. 5, 2012. Compositions and methods useful in aspects of the present technology are also described in the following applications filed concurrently with this disclosure: U.S. patent application Ser. No. 13/840,562, filed on Mar. 15, 2013, Binder et al., Methods and Non-Immunugenic Compositions for Treating Inflammatory Diseases; U.S. patent application Ser. No. 13/841,083, filed on Mar. 15, 2013, Landrigan, et al., Treatment of Inflammatory Respiratory Disease Using Protein Solutions; U.S. patent application Ser. No. 13/837,005, filed on Mar. 15, 2013, Woodell-May et al., Methods and Acellular Compositions for Treating Inflammatory Disorders; U.S. patent application Ser. No. 13/837,480, filed on Mar. 15, 2013, O'Shaughnessey, et al., Treatment of Pain Using Protein Solutions; U.S. patent application Ser. No. 13/839,280, filed on Mar. 15, 2013, Leach et al., Methods for Making Cytokine Compositions from Tissue Using Non-Centrifugal Methods; and U.S. patent application Ser. No. 13/841,103, filed on Mar. 15, 2013, Landrigan, et al., Treatment of Peripheral Vascular Disease Using Protein Solutions, all of which are incorporated by reference herein.
Contacting of the liquid containing cytokine-producing cells with the solid extraction material may be performed using a suitable container or other apparatus to effect the contact. Contacting may be performed in a continuous process wherein a flow of the liquid is passed over or through the solid extraction material, or the liquid and solid extraction material may be contained in a vessel. As discussed above, the vessel may comprise the solid extraction material, or may merely serve as a container holding the beads or other forms of the material. Containers useful in the present technology include those known in the art, such as the Plasmax™ Plus Plasma Concentrator, commercially available from Biomet Biologics, LLC (Warsaw, Indiana, USA) and may include those devices and methods of use as described in U.S. Pat. No. 7,553,413, Dorian et al., issued Jun. 30, 2009; and U.S. Pat. No. 7,694,828, Swift et al., issued Apr. 13, 2010.
Such a device is shown in
During use, a fluid 355 containing cytokine-producing cells and, optionally, platelets is injected to the upper chamber 305 via the inlet port 330 and mixed with the polyacrylamide beads 350. The fluid 355 and polyacrylamide beads 350 may be mixed by rotating the agitator stem 320 and the gel bead agitator 325, to help mix the fluid 355 and beads 350. The mixed fluid 355 and polyacrylamide beads 350 are then incubated for the desired time at the desired temperature. The device 300 is then centrifuged so that liquid passes to the lower chamber 310 while the polyacrylamide beads 350 are retained by a filter 345, thereby separating the polyacrylamide beads 350 from the resulting solution 360 of IL-1ra and other proteins that collects in the lower chamber 310. The solution 360 may be removed from the device via outlet port 335.
In some embodiments, a Protein Solution can be made in a process wherein a liquid containing cytokine-producing cells is isolated from a tissue and then contacted with a solid extraction material in a continuous process. Referring again to
The S/C device comprises a separation region, a first concentration region, a second concentration region, a buoy system, an inlet port, a check valve, a first withdrawal port and a second withdrawal port.
A method for obtaining a Protein Solution comprises spinning the S/C device 500 by centrifugation. Centrifugal forces allow the buoy system 515 to move through the whole blood, resulting in a fraction of the whole blood to be located in the buoy separation region 535. For example, this fraction may comprise platelet-rich plasma. With a use of a withdrawal syringe, the selected fraction can be removed from the collection volume 535 through the third buoy member 530 that defines a removal passage 540 that is connected with collection face passages 545. A connection elbow 550 can interconnect with the removal passage 540 to allow a vacuum to be formed through the connection elbow 550, the collection passage 540, and the buoy collection passages 545. A collection tube 555 can interconnect the connection elbow 550 with a withdrawal elbow 560 that extends from a wall 565 that can be a bottom wall of concentration region 570. A second withdrawal tube 575 can be first connected with a check valve assembly 580 and a first withdrawal port 585. The first withdrawal port 585 can be connected with the withdrawal syringe with a Luer lock type connection or other appropriate connection.
The check valve assembly 580 ensures the fraction being removed flows in one direction and prevents the fraction being removed from reentering the second withdrawal tube 575. Furthermore, when material is pushed back into the check valve assembly 580 from the first withdrawal port 585, such that material will enter the concentration region 570, a disc within the check valve 580 can flex down towards the second withdrawal tube 575 and close an opening and thereby open a second opening within the check valve assembly 580. The second opening allows the fraction to be pushed into the concentration region 570.
Therefore, the blood fraction is then re-injected through the first withdrawal port 285, through the check valve assembly 580, and into an upper volume 588 of the concentration region 570. Polyacrylamide beads 590 are added to the blood fraction in the upper volume 588 and the blood fraction and the polyacrylamide beads 590 can be mixed by shaking. Optionally, the blood fraction and the beads 590 can be incubated for a selected period of time before proceeding with the method.
The method comprises a second step of spinning by centrifugation. During the second centrifugation, the anti-inflammatory cytokine composition is separated from the beads 590 by being forced through a filter 592 and into a lower concentration region 595 of the concentration region 570. The Protein Solution can be withdrawn through a third withdrawal tube 596 and out a second withdrawal port 598 by use of a second withdrawal syringe. Again, the syringe can be connected to the second withdrawal port by a Luer) lock type connection.
Referring again to
Optional Electromagnetic Stimulation
The cytokine cell suspension can be stimulated with an electromagnetic field, before or during the contacting of the liquid with a solid extraction material. Thus, in some embodiments, stimulation of the liquid comprising the cells can be performed prior to contacting the liquid and the solid extraction material. However, it is preferred that at least a portion of the contacting step and at least a portion of the stimulating step overlap in time such that the liquid comprising the cells is concurrently in contact with the solid extraction material and stimulated with the electromagnetic field.
Stimulating the cytokine cell suspension with an electromagnetic field may involve various forms of electromagnetic stimulation, such as a pulsed electromagnetic field or a capacitively coupled electromagnetic field. In some embodiments, the liquid is stimulated using a power source coupled to a stimulation coil. The current passing through the coil produces a pulsing magnetic field which induces in the liquid a pulsing electric field. The coil may partially surround the liquid as it is held within a container, such as a tube or syringe. The coil may be integrated into to the container holding the cytokine cell suspension or may be removable. For example, a plastic tube can be formed with an integrated coil or the coil can be temporarily coupled to the container or placed within the container, for example, the tube can be configured so that the coil can be snapped onto the container. The power source can be coupled to the coil as needed to perform the stimulating step.
Stimulation of the liquid with an electromagnetic field may also include placing at least two electrodes across the liquid. Electrical energy may then be applied to the electrodes so as to capacitively couple the electrodes and generate the electromagnetic field there between. The electromagnetic field is therefore able to pass through the liquid so as to increase the rate and/or amount of cytokine production. In other embodiments, electrodes can be used to produce a direct current or one or more coils can be used to produce a pulsed electromagnetic field.
The strength of the electromagnetic field during stimulation can be at least about 0.5 microvolts per centimeter, whether produced by direct current, capacitively coupled current, or pulsed electromagnetic field. In the case of a direct current electrode, the amplitude of the current can be from about 1 to about 200 microamperes, and in some embodiments, the amplitude may be from about 20 to about 100 microamperes. In still further embodiments, the current may be about 20, about 60, or about 100 microamperes. It should be understood, however, that the amplitude of the current may be of other suitable magnitudes.
The electromagnetic field applied during the stimulating step may be constant or vary over time. For example, a sinusoidal time varying electromagnetic field can be applied using the electrodes placed across the liquid. Such a sinusoidal time varying electromagnetic field can have a peak voltage across the electrodes from about 1 volt to about 10 volts, and in some embodiments, the peak voltage can be about 5 volts. The corresponding electric field produced can have an amplitude of from about 0.1 millivolt per centimeter (mV/cm) to about 100 mV/cm, and in some embodiments can be about 20 mV/cm. The sinusoidal time varying electric field may have a frequency of from about 1,000 Hz to about 200,000 Hz, and in some embodiments the frequency may be about 60,000 Hz.
The electromagnetic field applied to the liquid may also be a pulsed electromagnetic field. The pulsed electromagnetic field can be induced using an external coil and a pulse generator. In this regard, a pulsed electromagnetic field may have a pulse duration of from about 10 microseconds per pulse to about 2000 microseconds per pulse. The pulse duration in one embodiment can be about 225 microseconds. The pulses may include electromagnetic bursts, in which a burst can comprise from 1 pulse to about 200 pulses. Alternatively, the electromagnetic field may have bursts that comprise from about 10 pulses to about 30 pulses. In this regard, in one embodiment each burst may comprise about 20 pulses.
The frequency at which bursts in the pulsed electromagnetic are applied may vary. In this regard, bursts can be repeated at a frequency of from about 1 Hz to about 100 Hz in some embodiments, and can be repeated at a frequency of about 10 Hz to about 20 Hz in other embodiments. Furthermore, bursts can repeat at a frequency of about 1.5 Hz, about 15 Hz or about 76 Hz. A burst can have a duration from about 10 microseconds up to about 40.000 microseconds. In this regard, a burst can have a duration of about 4.5 milliseconds.
Suitable devices for generating a capacitively coupled electromagnetic field include SpinalPak® spinal stimulator (EBI, L.P., Parsippany, New Jersey) or a DC stimulation device such as an SpF® XL IIb spinal fusion stimulator (EBI, L.P., Parsippany, New Jersey). Pulsed electromagnetic fields can be produced using various known methods and apparatuses, such as using a single coil or a pair of Helmholtz coils. For example, a suitable apparatus includes the EBI Bone Healing System® Model 2001 (EBI, L.P., Parsippany, New Jersey) and the BTBS stimulation coil. With respect to direct current, an electric field may be generated using any known device for generating a direct current electric field, such as for example, the Osteogen™ implantable bone growth stimulator (EBI, L.P., Parsippany, New Jersey). Other suitable devices for generating electromagnetic fields may be used.
Electromagnetic stimulation of the cytokine cell suspension can be continued and/or repeated as desired with respect to contacting the liquid and the solid extraction material. It should be understood, however, that the step of stimulating the liquid with an electromagnetic field includes fields other than, or in addition to, electric or electromagnetic fields associated with ambient conditions (such the electromagnetic fields generated by casual exposure to radios, telephones, desktop computers or similar devices).
In some embodiments, both the contacting and stimulating steps as shown in
Other Methods for Forming Protein Solutions
The present technology provides other methods for forming Protein Solutions, such as the admixture of proteins and other components and the isolation and concentration of proteins and components without using solid extraction materials. Protein Solutions of the present technology can be made entirely comprising proteins made by such methods, or by addition of proteins made by such methods with components or solutions made by tissue isolation and processing with solid extraction materials, as described above.
For example, various methods provide acellular or substantially acellular Protein Solutions, comprising one or more proteins as described above. Without limiting the scope, mechanism or function of the present technology, such acellular anti-inflammatory cytokine compositions may offer advantages in certain applications, insofar as they may not create an immunogenic response in subjects to whom they are administered.
In particular, by way of example, a Protein Solution may comprise interleukin-1 receptor antagonist (IL-1ra) that is synthetic or recombinant, or isolated from autologous, allogeneic or xenogeneic blood or other biologic sources, aside from the methods described above. For example, Kineret™ (anakinra) is a recombinant, non-glycosylated form of IL-1ra, sold by Amgen Manufacturing. Ltd. (Thousand Oaks, California). Various recombinant interleukin-1 inhibitors and methods of treatment are described in U.S. Pat. No. 6,599,873, Sommer et al., issued Jul. 29, 2003; U.S. Pat. No. 5,075,222, Hannum et al., issued Dec. 24, 1991; and U.S. Application Publication No. 2005/0197293, Mellis et al., published Sep. 8, 2005. In addition, methods for producing IL-1ra from body fluids, including the use of autologous fluids, are described in U.S. Pat. No. 6,623,472, Reinecke et al., issued Sep. 23, 2003; U.S. Pat. No. 6,713,246, Reinecke et al., issued Mar. 30, 2004; and U.S. Pat. No. 6,759,188. Reinecke et al., issued Jul. 6, 2004. When an allogeneic anti-inflammatory cytokine composition is to be generated, multiple sources of IL-1ra from multiple subjects may be pooled together.
More generally, methods for making acellular Protein Solutions can comprise culturing cells in a cell culture that either naturally produce anti-inflammatory cytokines, such as IL-1ra, or cells that are engineered to produce such cytokines. Non-limiting examples of cells that naturally produce anti-inflammatory cytokines include adipose tissue cells, adipocytes, adipose-derived stem cells, stromal cells, bone marrow cells, mesenchymal stem cells, and blood cells.
In various embodiments, cell lines can be engineered to overproduce an anti-inflammatory cytokine. Non-limiting examples of anti-inflammatory cytokines include VEGF, TNF-α, IL-1ra, sTNF-RI, sTNF-RII, PGDF-AB, PDGF-BB, IGF-I, EGF, TGF-β1, sIL-1RII, and HGF. Stable eukaryotic cell lines can be generated that overexpress an anti-inflammatory cytokine by transfecting eukaryotic cells, such as mammalian cells, with recombinant DNA comprising a gene encoding an anti-inflammatory cytokine and a selectable marker. Alternatively, prokaryotes and yeast can be engineered to overexpress an anti-inflammatory cytokine by transformation with recombinant DNA comprising a gene encoding an anti-inflammatory cytokine and a selectable marker. Transformations and transfections can be performed with recombinant DNA molecules comprising a DNA sequencing encoding an anti-inflammatory cytokine, such as IL-1ra, and a selectable marker. Eukaryotic and prokaryotic cells can be engineered to overexpress the anti-inflammatory cytokine constitutively or by induction. Methods for expressing anti-inflammatory cytokines, such as IL-1ra, sTNF-RI, and sTNF-RII, and sIL1-RII in eukaryotic and prokaryotic cells are described in U.S. Pat. No. 6,337,072, Ford et al., issued Jan. 8, 2002; and U.S. Application Publication No. 2001/0053764, Sims et al., published Dec. 20, 2001.
When a IL-1ra gene is transcribed in humans, the mRNA can be spliced into four variants, resulting in four isoforms of translated IL-1ra. SEQ ID NOs: 1, 3, 5, and 7 are the cDNAs for IL-1ra isoforms 1-4 respectively, and SEQ ID NOs: 2, 4, 6, and 8 are the amino acid sequences of IL-1ra isoforms 1-4 respectively. Collectively, the IL-1ra isoforms are referred to as “IL-1ra.” SEQ ID NO: 9 is the cDNA sequence for sTNF-RI and SEQ ID NO:10 is the amino acid sequence for sTNF-RI. SEQ ID NO:11 is the cDNA sequence for sTNF-RII and SEQ ID NO:12 is the amino acid sequence for sTNF-RII. SEQ ID NO:13 is the cDNA sequence for sIL-1RI and SEQ ID NO:14 is the amino acid sequence for sIL-1RI. SEQ ID NOs 15 and 17 are the cDNAs for sIL-1RIIv1 and sIL-1RIIv3 respectively, and SEQ ID NOs:16 and 18 are the amino acid sequences for sIL-1RIIv1 and sIL-1RIIv3 respectively. The cDNA sequence for IL-1RIIv2 is a non-coding sequence; therefore, it is not included.
To express either IL-1ra, sTNF-RI, or sTNF-RII (generically referred to as a “protein of interest”) in a prokaryotic culture, for example in a particular bacteria, a cDNA sequence (SEQ ID NOs: 1, 3, 5, 7, 9, 11, 13, 15, or 17) is cloned into an expression vector suitable for the bacteria. The expression vector should comprise a strong promoter, and a selectable marker, such as antibiotic resistance. Non-limiting examples of antibiotics capable of killing bacteria cells include ampicillin, tetracycline, kanamycin, and chloramphenicol. The expression vector should further comprise elements that result in constitutive or inducible expression of the protein of interest. Optionally, a DNA sequence corresponding to a tag functionally coupled to the protein of interest that allows for identification and purification of the protein can be present in the vector adjacent to the gene for the protein of interest. For example, an N or C-terminal His tag can be used to detect proteins with anti-His antibodies, and they allow for purification on nickel columns. When the expression vector comprising a gene expressing a protein of interest is prepared, a bacteria cell, for example E. coli, can be transformed with the expression vector. The selectable marker ensures that only cells transformed with the vector will survive in LB broth supplemented with an antibiotic corresponding to the selectable marker. The bacteria can then be grown in LB broth supplemented with the antibiotic for expression and purification. Expression vectors, methods for cloning a protein of interest into an expression vector, methods for transforming prokaryotic cells, methods for expressing protein from transformed prokaryotic cells, and protein purification methods are commonly known by those with ordinary skill in the art.
To express a protein of interest in a eukaryotic culture, for example in mammalian cells, a cDNA sequence (SEQ ID NOs: 1, 3, 5, 7, 9, 11, 13, 15, or 17) is cloned into an expression vector suitable for a particular mammalian cell. The expression vector should comprise a strong promoter, and a selectable marker, such as antibiotic resistance. Non-limiting examples of antibiotics capable of killing mammalian cells include geneticin and gentamicin. The expression vector should further comprise elements that result in constitutive or inducible expression of the protein of interest. Optionally, a DNA sequence corresponding to a tag functionally coupled to the protein of interest that allows for identification and purification of the protein can be present in the vector adjacent to the gene for the protein of interest. When the expression vector comprising a gene expressing a protein of interest is prepared, a mammalian cell, such as a human cell, can be transfected with the expression vector. Transfected cells can be grown in a cell culture medium supplemented with an antibiotic corresponding to the selectable marker. The presence of the antibiotic allows for the isolation of stable cell lines. Stable cell lines can then be grown in cell culture medium supplemented with antibiotic for expression and purification. Expression vectors, methods for cloning a protein of interest into an expression vector, methods for transfecting eukaryotic cells and developing stable cell lines, methods for expressing protein from transfected eukaryotic cells, and protein purification methods are commonly known by those with ordinary skill in the art.
Alternatively, eukaryotic cells that have not been genetically altered by DNA transfection can be cultured. The eukaryotic cells can be primary cultures, i.e. cells grown directly from a eukaryotic donor, such as a human, or the eukaryotic cells can be established cell lines. Many established cell lines are available commercially from American Type Culture Collection. Inc. (Manassas, VA, USA). The cells can be grown with or an exogenous signal, such as a recombinant protein. Eukaryotic cells are often cultured in culture flasks with cell culture medium. The cell culture medium can be recovered from the flasks, and centrifuged to remove any non-adherent cells.
A cell culture can be a monolayer culture, a non-adherent culture, or a bioreactor. A monolayer culture comprises anchorage-dependent cells that are cultured on a suitable substrate that allows cell adhesion and spreading, such as cell culture flasks and cell culture dishes. A non-adherent culture comprises cells that are maintained in a suspension. Suitable cells are either not anchorage-dependent, or they are anchorage-dependent cells that have been adapted for culture in a suspension. Many cell lines, for example many insect cells, can be grown in either a monolayer or a suspension. A bioreactor is a device that can support a biologically active environment in which chemical processes are carried out and/or biochemically active substances are derived. Bioreactors can include suspended or immobilized cells. Monolayer cultures, non-adherent cultures, and bioreactors can be maintained by methods commonly used in the art.
In some embodiments, the cell culture is subjected to an electromagnetic field, so as to stimulate the production of one or more proteins. Stimulating the culture with an electromagnetic field may involve various forms of electromagnetic stimulation, such as a pulsed electromagnetic field or a capacitively coupled electromagnetic field. Methods and conditions for stimulation include those discussed above.
Cell cultures can either release anti-inflammatory cytokines into culture medium naturally, or the cultures can be induced to release the anti-inflammatory cytokines into the culture medium. The culture medium can be isolated by aspiration, centrifugation or filtration to form the acellular anti-inflammatory cytokine composition.
In some embodiments, an anti-inflammatory cytokine is isolated from urine, for use in producing a Protein Solution of the present technology. Proteins can be isolated from urine by methods among those known in the art. One such method is employed in the ProteoSpin™ Urine Protein Concentration Maxi Kit sold by Norgen Biotek Corp. (Thorold, Ontario, Canada). This kit utilizes an ion exchange resin integrated into a spin column. Briefly, a urine sample is obtained and its pH adjusted to 3.5. The urine is then transferred to a spin column containing the ion exchange resin, which is placed in a collection tube. The column is then centrifuged, wherein the proteins attach to the resin, and the remaining fluids and salts flow into the collection tube and are discarded. The proteins are then washed by applying supplied column activation and wash buffer followed by centrifugation. The flow through is discarded and the wash procedure is repeated. An elution buffer (10 mM sodium phosphate. pH 12.5) is added to the column and neutralizer is added to an elution tube. The spin column containing the elution buffer is placed in the elution tube and centrifuged, whereby the proteins are eluted and captured in the elution tube containing neutralizer.
The present technology also provides compositions comprising a Protein Solution and a second component comprising active materials, physiological carriers, and combinations thereof. In some embodiments, compositions comprise a safe and effective amount of the Protein Solution and a safe and effective amount of a second active. A “safe and effective” amount of a component is an amount that is sufficient to have the desired therapeutic effect in the human or other mammalian subject, without undue adverse side effects (such as toxicity, irritation, or allergic response), commensurate with a reasonable benefit/risk ratio when used in the manner of this technology. The specific safe and effective amount of the component will, obviously, vary with such factors as the particular condition being treated, the physical condition of the patient, the nature of concurrent therapy (if any), the specific components used, the specific route of administration and dosage form, the carrier (if any) employed, and the desired dosage regimen.
Active materials among those useful herein include biologics and pharmaceutical actives. Biologics include blood fractions, such as PRP, blood products, and concentrated bone marrow aspirate (cBMA).
Accordingly, in some embodiments, the present technology provides compositions comprising a safe and effective amount of a Protein Solution and a safe and effective amount of cBMA, cBMA can include hematopoietic, stem cells, stromal stem cells, mesenchymal stem cells, endothelial progenitor cells, red blood cells, cytokine-producing cells, fibroblasts, reticulocytes, adipose cells, or endothelial cells. As described above, the Protein Solution may be made using bone marrow aspirate as a cytokine containing tissue. However, a therapeutic composition may additionally comprise cBMA with Protein Solution. In one embodiment, a therapeutic composition comprises a Protein Solution and cBMA in an Protein Solution:cBMA ratio of about 1:1, about 1:2, about 1:3, about 1:4, about 1:5, about 1:6, about 1:7, about 1:8, about 1:9 or about 1:10. Alternatively, the Protein Solution:cBMA ratio can be about 2:1, about 3:1, about 4:1, about 5:1, about 6:1, about 7:1, about 8:1, about 9:1 or about 10:1. The cBMA and Protein Solution may also be produced simultaneously. Thus, in reference to FIG. 1 and the processes described above, bone marrow aspirate may be added to the whole blood obtained in step 115, prior to or during the contacting with a solid extraction material in step 140; such a process involves operation of both steps 115 and 130. For example, bone marrow aspirate may be added to whole blood prior or during isolation of platelet-rich plasma in step 120. Such methods include those described in U.S. Application Publication No. 2006/0278588, Woodell-May, published Dec. 14, 2006.
In some embodiments, the cBMA and Protein Solution may be produced simultaneously. Thus, in reference to
Pharmaceutical actives among those useful herein include herein include organic molecules, proteins, peptides, peptidomimetics, nucleic acids, nucleoproteins, antisense molecules, polysaccharides, glycoproteins, lipoproteins, carbohydrates and polysaccharides, botanical extracts, and synthetic and biologically engineered analogs thereof, living cells (other than cytokine-producing cells stromal cells) such as chondrocytes, bone marrow cells, viruses and virus particles, natural extracts, and combinations thereof. Specific non-limiting examples of bioactive materials include hormones, antibiotics and other anti-infective agents, hematopoietics, thrombopoietics, antiviral agents, antitumor agents (chemotherapeutic agents), antipyretics, analgesics, anti-inflammatory agents, antiallergy agents, vasodilators, cytokines, growth factors, gene regulators, vitamins, minerals and other nutritionals, nutraceuticals and combinations thereof. In some embodiments, compositions may comprise growth factors in addition to those present in the Protein Solution, such Platelet-Derived Growth Factor (PDGF), Transforming Growth Factor Beta (TGF-β), Insulin-Like Growth Factor (IGF), Fibroblast Growth Factor (FGF), Epidermal Growth Factor (EGF), Vascular Endothelial Growth Factor (VEGF), and Bone Morphogenetic Proteins (BMPs).
The compositions may comprise a carrier material, in addition to any liquid comprising the Protein Solution. It should be understood that in various embodiments of the present technology, methods of treatment employ the Protein Solution as comprised and made above, without further carrier, by direct injection or other application to the site of treatment. However, in other embodiments, an additional carrier material may be used for such reasons as for ease of administration, to facilitate administration using a particular delivery device, enhancing activity, an increasing the length of time the Protein Solution remains at the site of administration. Carriers among those useful herein include saline, hyaluronic acid, collagen, buffers (such as Hank's Buffer), cell culture media, blood products (such as PRP and platelet poor plasma), and mixtures thereof.
Protein Solutions, and compositions comprising Protein Solutions may be sterilized prior to administration, by any suitable method. For example, a Protein Solution may be sterilized by including a sterile filter to process the product made by the processes described above. In some embodiments, an antibiotic may be included in the solid extraction material during the contacting step described above, or may be added at one or more of the various steps in the methods and treatments described herein. Alternatively, or in addition, the Protein Solution may be produced asceptically
Protein Solutions and compositions comprising Protein Solutions may also be lyophilized (freeze drying, or cryodesiccation) after production, using methods among those known in the art. Thus, as depicted in
The present technology also provides compositions comprising components derived from blood or other tissue that are suitable for allogeneic administration. In particular, such compositions may comprise proteins and other components isolated from a mammalian subject, or a plurality of mammalian subjects, other than the subject to whom the composition is to be administered in a method of this technology. In further reference to
In some embodiments, a crypreservative storage solution is added to the Protein Solution, to provide stability for subsequent storage at reduced temperatures. Suitable storage solutions include those in the art, such as glycerol and dimethylsulfoxide (DMSO). The composition may be stored at reduced temperatures, such as from about 1° C. to about 6° C. In some embodiments, the composition is stored under liquid nitrogen, at about −80° C. Preferably, the cryopreservative storage solution is removed from the Protein Solution prior to administration to a mammalian subject. Removal of the storage solution may be performed by methods including those known in the art for processing stored blood comprising cryopreservatives. Washing may be performed using a wash solution, such as saline. In such embodiments, the blood type of the subject to be treated may be matched to the blood type of the donor from whom the cytokine cell suspension was obtained.
The present technology provides methods for stimulating chondrocyte production, including stimulating chondrocyte production at the site of a collagen defect. Methods include the treatment of collagen defects by stimulating chondrocyte production. Methods comprising administration of a Protein Solution of the present technology to site of the defect in the subject. As referred to herein, “treatment” includes one or more of preventing enlargement or progression of a defect, reducing the size of a defect, healing of the defect, and reducing or eliminating pain associated with the defect. Collagen defects may be associated with acute or chronic disorders, and may be associated with an underlying injury, trauma, disease, or other physiologic insufficiency of bone, muscle, cartilage, vascular tissue, or other comprising collagen. In various embodiments, the pain disorder is associated with an inflammatory disorder, including inflammation mediated by IL1-ra. Such inflammatory disorders include rheumatoid arthritis, osteoarthritis, osteolytis, tendonitis, synovitis, peripheral vascular disease, and inflammatory respiratory diseases (such as chronic obstructive pulmonary disease, fibrosis, emphysema, acute respiratory distress syndrome, and pneumonia). Specific pain disorders include pain associated with traumatic injury, muscle strain, arthritis (rheumatoid arthritis and osteoarthritis), synovitis, sacroiliac joint disorders, back disorders, post-surgical injections, tendon injections, sports medicine procedure (for example, ACL repair. MCL repair, BTB repair, patella repair, or cartilage repair), contusions, muscle strains, post traumatic osteoarthritis.
In some embodiments, methods of the present technology comprise administration of a Protein Solution to the site of a collagen tissue defect. As referred to herein, such “tissue defects” include any condition involving tissue which is inadequate for physiological or cosmetic purposes. Examples of such defects include those that are congenital, those that result from or are symptomatic of disease, disorder, or trauma, and those that are consequent to surgical or other medical procedures. Embodiments include treatment for vascular, bone, skin, nerve, and organ tissue defects. Examples of such defects include those resulting from arthritis (osteoarthritis and rheumatoid arthritis), spinal fixation procedures, hip and other joint replacement procedures, chronic wounds, fractures, sclerosis of tissues and muscles, and spinal cord or other nerve injury. In various embodiments, the compositions and methods of this invention may be used in methods associated with the repair bone or cartilage defects. For example, the present technology provides methods for stimulating chondrocyte production at the site of a joint afflicted with osteoarthritis, comprising administering a Protein Solution at or near the joint.
In various embodiments, methods are for the treatment of cartilage defects in a human. In other embodiments, treatment is of a defect in a non-human mammal, such as a companion, working, or sports animal. For example, such methods of this technology may be used for treatment of a collagen defect associated with a joint injury in a horse.
In various embodiments, methods of the present technology comprise a point-of-care method for making a Protein Solution. As referred to herein, a “point-of-care method” wherein the processes of the present technology are performed at a time proximate to the administration of the Protein Solution to the subject being treated. Such methods may be performed at a location proximate, such as in the same room (for example, bed side) or otherwise immediately adjacent, to the mammalian subject to be treated with the Protein Solution. In various embodiments, a “proximate time” may be, for example, within 12 hours, within 8 hours, within 2 hours, within 1 hour or within 30 minutes of administration of the Protein Solution to the subject.
In some embodiments, the Protein Solution is administered with a concomitant therapy. Such therapies include, for example, the administration of pharmaceutical actives or biologics, as described above. In some embodiments, concomitant therapies are administered concurrently with a Protein Solution. For example, methods may comprise administration of a Protein Solution with a safe and effective amount of an active selected from the group consisting of analgesics and glucocorticosteroids.
In some embodiments, methods comprise administration of a Protein Solution with concentrated bone marrow aspirate, as described above. For example, cBMA and a Protein Solution may be administered concomitantly.
Methods of the present technology generally comprise administration of a Protein Solution to the site of collagen defect in a mammalian subject. Administration of the Protein Solution can be performed with any suitable device, including such devices known in the art for topical delivery of compositions to the muscle, joint, vascular, or other tissue. For example, topical delivery for treatment of a cartilage defect in a joint may comprise injection of a Protein Solution at or near the joint.
Embodiments of the present technology are further illustrated through the following non-limiting examples.
A Protein Solution rich in interleukin-I receptor antagonist is prepared from seven consented human providers. Blood (55 mL) is drawn into a 60 cc syringe with 5 mL of anticoagulant citrate dextrose solution A (ACD-A, Citra Labs, Braintree, MA). Platelet-rich plasma (PRP) is created using the GPS® III platelet concentration system (800-1 003A, Biomet Biologics, Warsaw, Indiana) according to the instructions for use. The solution is generated by adding 6 mL of PRP to a modified Plasmax device containing 1 gram of polyacrylamide beads (Biomet Biologics, Warsaw, IN). The IL-1ra solution is removed from the Plasmax devices and frozen at minus 50° C. for the assay. Cytokine content is assayed on a 16-plex ELISA (Searchlight Protein Array, Aushon Biosystems, Billerica, MA). The analytes included IL-4, IL-10, IL-11, IL-13, IL-1ra, IFN-γ, sTNF-RI, sTNF-RII, IL-1α, IL-1β, TNF-α, IL-17, IL-18, bFGF, TBF-β1, and TBF-β2.
The solution contains both anabolic (bFGF, TGF-β1, TGF-β2 (see Table 3)) and anti-inflammatory (IL-1ra, sTNF-RI, sTNF-RII, IL-4, IL-10, IL-11, IL-13, IFN-γ, (see Table 4)) cytokines without expressing large doses of catabolic cytokines (IL-1α, IL-1β, TNF-α, IL-17, IL-18 (see Table 5)). The anti-inflammatory cytokines IL-1ra and sTNF-R are all detected in ng/mL quantities, while all of the catabolic analytes were in pg/mL quantities. However, donor-to-donor variability is detected. Correlations between the catabolic cytokines IL-1 and TNF-α and anti-inflammatory analytes IL-1ra and sTNF-R are compared, but no large correlations detected (Table 6). On average, there is about 13,260 times more IL-1ra than IL-1α and about 7,561 times more than IL-1β.
An IL-1ra-rich solution is created as follows. Whole blood (70 mL) anticoagulated (10%) with ACD-A (Braintree, Massachusetts, USA) is drawn from 5 healthy volunteers. A portion (10 mL) is reserved for a whole blood measurement. Platelet-rich plasma (PRP) (6 mL) is produced using the GPS® II System (Biomet Biologics, LLC, Warsaw, Indiana, USA). Complete blood counts are collected for the whole blood and PRP samples following a validated procedure, as described in Woodell-May J E, Ridderman D N, Swift M J, Higgins J. “Producing Accurate Platelet Counts for Platelet Rich Plasma: Validation of a Hematology Analyzer and Preparation Techniques for Counting” J. Craniofac. Surg. (2005) September 16(5):749-56.
Following the PRP production, 5 mL of the PRP is added to a modified plasma concentration device (Plasmax™. Biomet Biologics LLC, Warsaw, Indiana, USA) and incubated with polyacrylamide desiccating beads in the device for 24 hours at room temperature. Following the contact with polyacrylamide beads the electromagnetic field, the plasma concentration device is centrifuged to separate the serum fraction.
To analyze baseline IL-1ra levels at time zero, the whole blood and PRP samples are activated with 50 μL of thrombin and 10% CaCl2) (1,000 units/mL). A blood clot is formed and incubated for 30 minutes at room temperature. Following incubation, the clot is centrifuged for 5 minutes at 3,000 rpm. Serum is collected from the clots and retained for ELISA analysis. The serum fraction from the plasma concentrator does not require activation by thrombin, and is tested directly. All samples are analyzed for IL-1ra using an ELISA kit (IL-1ra Quantikine™ Kit, R&D Systems, Minneapolis, Minnesota, USA).
The PRP samples result in about an eight-fold increase in platelets, about five-fold increase in total cytokine-producing cells (WBCs), about nine-fold increase in the monocyte fraction of the WBCs. and about a three-fold increase in the PMN fraction of the WBCs. The IL-1ra production in the whole blood and PRP samples is correlated most closely to the WBC concentration. The five-fold increase in the PRP is likely due to the increase in WBCs, and both the whole blood and PRP IL-1ra values can be considered baseline IL-1ra content. This is in contrast to the 195-fold increase in IL-1ra following incubation in the plasma concentrator. This plasma concentration device typically results in a 3-fold increase in plasma protein concentration due to a volume reduction caused by the desiccation process. This 3-fold decrease in volume does not account for the levels of increase seen in the amount of IL-1ra. Therefore, this level of increase indicates stimulation of WBCs to produce IL-1ra during the contact with the solid extraction material (e.g., polyacrylamide beads) and electromagnetic field stimulation.
Correlation analysis demonstrates that IL-1ra production is more closely correlated with the increase in WBCs than the platelet content. The IL-1ra levels do not correlate as closely with the WBC population in the PRP. This is not surprising since the WBC are not activated, and the serum is collected by thrombin activation of the plasma. However, it is possible that the WBC, once activated in the plasma concentration device, participate in the significant production of IL-1ra seen.
Anticoagulated blood (120 cc) is collected from 5 human donors. Platelet-rich plasma (PRP) is prepared using GPS® HI disposables (Biomet Biologics LLC, Warsaw, Indiana, USA). PRP is loaded into modified plasma concentration devices (Plasmax™, Biomet Biologics LLC, Warsaw, Indiana, USA) and processed. The output is divided into 4 groups: IL-1ra in concentrated plasma with and without thrombin activation (1000 U/mL in 1M CaCl2)), or cell-free IL-1ra with and without thrombin activation. IL-1ra is measured using ELISA (R&D Systems) over time.
The PRP contacts polyacrylamide beads in the Plasmax™ device while electromagnetic field stimulation is provided using a capacitively coupled electromagnetic field.
Unclotted PRP produces an average of about 50 ng over 24 hrs. The cell-free samples produce about 34 ng without changing over 24 hrs. Once clotted, the elution of IL-1ra is slowed, with only about 30% being eluted after 10 hours. Release in the cell-free samples is also delayed, but eluted 100% of available IL-1ra after 10 hours.
An Autologous Protein Solution (APS) from healthy patients are prepared as follows for the measurement of growth factors. 72 ml of anticoagulated whole blood are drawn by venipuncture from each of six donors. 3 ml of each donor's anticoagulated whole blood are aliquoted into microcentrifuge tubes and frozen at −50° C. 60 ml of the anticoagulated whole blood is loaded into GPS® III disposable devices (Biomet Biologics LLC, Warsaw, Indiana, USA), which is processed according to the manufacturer's instructions to produce PRP. The PRP is removed from the GPS® III devices and added to Plasmax™ devices (Biomet Biologics LLC, Warsaw, Indiana, USA), which is processed according to the manufacturer's instructions to produce APS. APS is extracted from each device, aliquoted into microcentrifuge tubes, and frozen at −50° C. Each sample, whole blood and PRP, is subjected to three freeze-thaw cycles. Quantikine Human Immunoassays (R&D Systems, Inc., Minneapolis, MN) for VEGF, PDGF-BB, PDGF-AB, EGF, TGF-β1, TGF-β2, and IGF-1 are run in duplicate according to the manufacturer's instructions for each APS and whole blood sample.
APS from healthy patients is prepared as above for the measurement of anti-inflammatory cytokines. Quantikine Human Immunoassays (R&D Systems, Inc., Minneapolis, MN) for IL-1ra, IL-1β, IL-8, sTNF-RI, TNF-α, IL-6, sTNF-RII, IL-10, IL-13, and IL-4 are run in duplicate according to the manufacturer's instructions for each APS and whole blood sample. Immunoassays are also performed to detect hepatocyte growth factor (HGF) and soluble IL-1RII.
APS from 105 osteoarthritis patients is prepared as above for the measurement of growth factors anti-inflammatory cytokines. The APS is stored at −50° C. or in dry ice.
Cytokine concentrations are compared between healthy donors and OA patients in baseline blood and APS. IL-1p is concentrated at a higher level in OA patients, but the fold increase is still much lower than that of IL-1ra. Other cytokines and growth factors that are concentrated at least to the level of that observed in healthy donors include sTNF-RI, IGF-I, IL-8, VEGF, and IL-6. The soluble cytokines sTNF-RII and sIL-1RII are concentrated to a level not quite as high but very similar to the healthy concentration level. The results are displayed in Table 7.
Adipose stromal cells are prepared as follows. Adipose tissue is minced into small pieces (about 1 cm3) and digested in 2 mg/mL type I collagenase (Worthington Biochemical Corp., Lakewood, N.J.) under intermittent mechanical agitation in a water bath at 37° C. for 180 minutes. Digestion can be neutralized by the addition of medium or a blood-derived solution. The cell suspension is centrifuged (300×g for 7 minutes at 25° C.) followed by removal of the supernatant from the cell pellet. The pellet is then re-suspended in a compatible solution to provide a liquid volume comprising adipose stromal cells.
Alternatively, the pellet is suspended with whole blood obtained from the subject, and added to a GPS™ Platelet Concentrate System, from Biomet Biologics, Inc. (Warsaw, Ind.). Following centrifugation, the platelet-rich plasma layer, which also contains the adipose stromal cells, is extracted from the system.
The adipose stromal cells, optionally including platelet-rich plasma, are then combined with polyacrylamide beads and subjected to a pulsed electromagnetic field by using a pair of Helmholtz coils to stimulate production of IL-1ra. The adipose stromal cells and polyacrylamide beads are separated from the liquid solution to obtain a solution rich in IL-1ra.
A therapeutic composition of IL-1ra is generated from stromal cells isolated from adipose tissue. Isolation of human stromal cells is performed by obtaining human subcutaneous adipose tissue from lipoaspiration/liposuction procedures and digesting the tissue in collagenase type I solution (Worthington Biochemical Corp., Lakewood, N.J.) under gentle agitation for 1 hour at 37° C. The dissociated cells are filtered with 500 μm and 250 μm Nitex filters. The fraction is centrifuged at 300×g for 5 minutes. The supernatant is discarded and the cell pellet is re-suspended in a compatible liquid solution, such as a blood-derived solution.
The headings (such as “Introduction” and “Summary”) and sub-headings used herein are intended only for general organization of topics within the present disclosure, and are not intended to limit the disclosure of the technology or any aspect thereof. In particular, subject matter disclosed in the “Introduction” may include novel technology and may not constitute a recitation of prior art. Subject matter disclosed in the “Summary” is not an exhaustive or complete disclosure of the entire scope of the technology or any embodiments thereof. Classification or discussion of a material within a section of this specification as having a particular utility is made for convenience, and no inference should be drawn that the material must necessarily or solely function in accordance with its classification herein when it is used in any given composition.
The disclosure of all patents and patent applications cited in this disclosure are incorporated by reference herein.
The description and specific examples, while indicating embodiments of the technology, are intended for purposes of illustration only and are not intended to limit the scope of the technology. Equivalent changes, modifications and variations of specific embodiments, materials, compositions and methods may be made within the scope of the present technology, with substantially similar results. Moreover, recitation of multiple embodiments having stated features is not intended to exclude other embodiments having additional features, or other embodiments incorporating different combinations of the stated features. Specific examples are provided for illustrative purposes of how to make and use the compositions and methods of this technology and, unless explicitly stated otherwise, are not intended to be a representation that given embodiments of this technology have, or have not, been made or tested.
As used herein, the words “prefer” or “preferable” refer to embodiments of the technology that afford certain benefits, under certain circumstances. However, other embodiments may also be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the technology.
As used herein, the word “include,” and its variants, is intended to be non-limiting, such that recitation of items in a list is not to the exclusion of other like items that may also be useful in the materials, compositions, devices, and methods of this technology. Similarly, the terms “can” and “may” and their variants are intended to be non-limiting, such that recitation that an embodiment can or may comprise certain elements or features does not exclude other embodiments of the present technology that do not contain those elements or features.
Although the open-ended term “comprising,” as a synonym of non-restrictive terms such as including, containing, or having, is used herein to describe and claim embodiments of the present technology, embodiments may alternatively be described using more limiting terms such as “consisting of” or “consisting essentially of.” Thus, for any given embodiment reciting materials, components or process steps, the present technology also specifically includes embodiments consisting of, or consisting essentially of, such materials, components or processes excluding additional materials, components or processes (for consisting of) and excluding additional materials, components or processes affecting the significant properties of the embodiment (for consisting essentially of), even though such additional materials, components or processes are not explicitly recited in this application. For example, recitation of a composition or process reciting elements A, B and C specifically envisions embodiments consisting of, and consisting essentially of, A, B and C, excluding an element D that may be recited in the art, even though element D is not explicitly described as being excluded herein. Further, as used herein the term “consisting essentially of” recited materials or components envisions embodiments “consisting of” the recited materials or components.
A” and “an” as used herein indicate “at least one” of the item is present; a plurality of such items may be present, when possible. “About” when applied to values indicates that the calculation or the measurement allows some slight imprecision in the value (with some approach to exactness in the value; approximately or reasonably close to the value; nearly). If, for some reason, the imprecision provided by “about” is not otherwise understood in the art with this ordinary meaning, then “about” as used herein indicates at least variations that may arise from ordinary methods of measuring or using such parameters.
As referred to herein, ranges are, unless specified otherwise, inclusive of endpoints and include disclosure of all distinct values and further divided ranges within the entire range. Thus, for example, a range of “from A to B” or “from about A to about B” is inclusive of A and of B. Disclosure of values and ranges of values for specific parameters (such as temperatures, molecular weights, weight percentages, etc.) are not exclusive of other values and ranges of values useful herein. It is envisioned that two or more specific exemplified values for a given parameter may define endpoints for a range of values that may be claimed for the parameter. For example, if Parameter X is exemplified herein to have value A and also exemplified to have value Z, it is envisioned that Parameter X may have a range of values from about A to about Z. Similarly, it is envisioned that disclosure of two or more ranges of values for a parameter (whether such ranges are nested, overlapping or distinct) subsume all possible combination of ranges for the value that might be claimed using endpoints of the disclosed ranges. For example, if Parameter X is exemplified herein to have values in the range of 1-10, or 2-9, or 3-8, it is also envisioned that Parameter X may have other ranges of values including 1-9, 1-8, 1-3, 1-2, 2-10, 2-8, 2-3, 3-10, and 3-9.
This application is a continuation application of U.S. patent application Ser. No. 14/973,913, filed on Dec. 18, 2015, now allowed, which is a continuation application of U.S. patent application Ser. No. 13/840,129, filed on March 15.2013, now abandoned, which patent disclosures are hereby incorporated by reference in its entirety.
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