KR20210047839A - Porous scaffold including protein from serum - Google Patents

Abstract

The present invention relates to a porous scaffold including protein from serum, and a manufacturing method thereof, and according to the porous scaffold according to an embodiment, not only can the cells be stably and continuously cultured, but also each cell shows a culture pattern that matches the characteristics of the cell for actual tissue to be simulated. In addition, with stable culture and a high in vivo engraftment rate, the porous scaffold can be usefully used for evaluation of drug activity and toxicity using organoids, cell therapy products, or production of target proteins.

Description

Porous cell scaffold containing serum-derived protein {POROUS SCAFFOLD INCLUDING PROTEIN FROM SERUM}

It relates to a porous cell scaffold comprising a serum-derived protein and a method for producing the same.

The porous scaffold has been widely applied as a scaffold for wound healing, burn healing, drug delivery, and damaged tissue regeneration. In particular, a scaffold for regeneration of damaged tissues requires a structure and stability suitable for culturing cells extracted and separated from a small amount of tissue in a sufficient amount, and must have biocompatibility and biodegradability that does not exhibit side effects after implantation in the body. Therefore, a biodegradable scaffold for effective cell regeneration and growth must have a porous structure that allows tissue cells to adhere to the surface of the scaffold to form a three-dimensional structure, and facilitates the movement of moisture and cell growth factors. It should be suitable for cell attachment and growth. In addition, the porous scaffold must be well compatible with the surrounding tissues after implantation in the body, has no side effects such as inflammatory reactions, and must have high biocompatibility since it is biodegraded by itself and does not remain as a foreign substance after the tissue is regenerated. Therefore, a porous scaffold with excellent biocompatibility, biodegradability, and mechanical properties is essential for tissue regeneration and restoration.

The cell culture-related biopharmaceutical industry market has been showing double-digit growth every year since 2011. In particular, a market of more than USD 120 billion was formed in 2014, but there is a shortage of experts in 3D cell culture in Korea, so the situation is dependent on foreign institutions. The 3D cell culture technology is a high-tech technology with a bright future prospect that is used not only for drug efficacy and toxicity detection, but also for the development of artificial organs, and according to BCC Research, the market size is estimated to be around 6 billion dollars in 2016. It is expected to maintain a growth rate of more than 10% annually and grow to 8 billion dollars in 2019. In addition, the market related to tissue engineering and regeneration (including cell-based artificial organs) is expected to reach $ 60.8 billion in 2021 from $ 13.6 billion in 2016, and a high growth rate of 34.9% on average is expected worldwide. It is a field.

Therefore, there is a need for a study on a porous cell scaffold to produce a cell aggregate that has a high engraftment rate and storage ability and is realized similar to a real human tissue.

One aspect is to provide a porous cell support comprising a serum-derived protein obtained by crosslinking the protein in the serum plasma protein aqueous solution by treating the isolated serum or plasma protein aqueous solution with a crosslinking agent, and then reducing it with a reducing agent.

Another aspect, a porous cell scaffold; And it is to provide a composition for tissue repair or regeneration comprising the cells dispensed in the porous cell support.

In another aspect, the steps of forming a three-dimensional cell aggregate by dispensing cells on a porous cell support and culturing them in three dimensions; And it is to provide a method for evaluating the pharmacological activity or toxicity of a candidate substance comprising the step of treating the candidate substance to the three-dimensional cell aggregate.

In another aspect, the steps of forming a three-dimensional cell aggregate by dispensing cells on a porous cell support and culturing them in three dimensions; And it is to provide a method of producing a target material comprising the step of separating the target material from the culture or culture medium of the three-dimensional cell aggregate.

In another aspect, the steps of crosslinking the proteins in the serum or plasma protein aqueous solution by treating the separated aqueous serum or plasma protein aqueous solution with a crosslinking agent; Reacting the protein in the cross-linked serum or plasma protein aqueous solution with a reducing agent to obtain a reactant; And homogenizing the reaction product to obtain a serum-derived protein.

In order to achieve the above object, one aspect is a porous cell support comprising a serum-derived protein obtained by cross-linking the protein in the serum or plasma protein aqueous solution by treating the isolated serum or plasma protein aqueous solution with a crosslinking agent, and then reducing it with a reducing agent. Provides.

As used herein, the term "serum-derived protein" is from fetal bovine serum (FBS), bovine calf serum (BCS) or other animals (for example, mammals or humans), which are commonly used for tissue culture. It may mean a protein obtained by cross-linking a protein in the serum by treating the derived serum with a crosslinking agent. In addition, serum albumin, lipoprotein, haptoglobin, transferrin, ceruloplasmin, immunoglobulin, various complements, fibrinogen, prothrombin, plasminogen, kininogen, precalicrane, fibronectin, α2-HS- It may mean a protein obtained by cross-linking a protein in an aqueous solution of a protein temporarily present in the blood with a glycoprotein, angiotensinogen, or a hormone.

The crosslinking agent used in the present specification is dextran dialdehyde, 1-ethyl 3-[3-dimethylaminopropyl]carboimide hydrochloride (1-ethyl-3-[3-dimethylaminopropyl]carboimide hydrochloride), vinylamine (vinylamine), 2-aminoethyl methacrylate, 3-aminopropyl methacrylamide, ethylene diamine, ethylene glycol dimethacrylate , Methyl methacrylate, N,N'-methylene-bisacrylamide, N,N'-methylenebis-methacrylamide ), diallyltartardiamide, allyl(meth)acrylate, lower alkylene glycol di(meth)acrylate, lower poly Alkylene glycol di(meth)acrylate (poly lower alkylene glycol di(meth)acrylate), lower alkylene di(meth)acrylate (lower alkylene di(meth)acrylate), divinyl ether, Divinyl sulfone, divinylbenzene, trivinylbenzene, trimethylolpropane tri(meth)acrylate, pentaderitol tetra(meth)acrylate (pentaerythritol tetra(meth)acrylate), bisphenol A di(meth)acrylat e), methylenebis(meth)acrylamide, triallyl phthalate, diallyl phthalate, allyl glycidyl ether, alkyl choloride ), 　transglutaminase, lysyl oxidase, protein disulfide-isomerase, protein-disulfide reductase, sulfhydryl oxidase (sulfhydryl oxidase), lipoxygenase, polyphenol oxidase, tyrosinase, peroxidase, laccase, horseradish peroxidase ( Horseradish peroxidase) and combinations thereof, and any other substances that bind proteins are applicable.

Among the crosslinking agents, the enzyme crosslinking agent may be an enzyme derived from any microorganism (eg, Streptoverticillium mobaraense).

As used herein, the term "reducing agent" refers to a substance that reduces disulfide bonds of proteins in serum. The reducing agent used herein is beta-mercaptoethanol (b-mercaptoethanol), dithiolthreitol (DTT), tris (2-carboxyethyl) phosphine (tris (2-carboxyethyl) phosphine: TCEP)), It includes cysteine, glutathione, and tris(3-hydroxypropyl)phosphine (THPP)), and any other substance that reduces the disulfide bonds of proteins can be applied.

The pore size of the porous cell scaffold according to one embodiment is 50 to 600 μm, 100 to 550 μm, 150 to 500 μm, 200 to 450 μm, 250 to 400 μm, 300 to 350 μm, 50 to 300 μm, 100 to 250 Μm, 150 to 200 µm, 300 to 600 µm, 350 to 550 µm, 400 to 500 µm.

The elastic modulus of the porous cell scaffold according to one embodiment is 1 to 10 kPa, 2 to 8 kPa, 3 to 8 kPa, 1 to 5 kPa, 4 to 10 kPa, 6 to 10 kPa, 1 to 3 kPa, or 4 to 6 kP Can be

The porosity of the porous cell support according to one embodiment is 10 to 80%, 20 to 80%, 30 to 70%, 40 to 60%, 10 to 40%, 10 to 30%, 50 to 80%, or 60 to 80 It can be %.

In another embodiment, the porous cell scaffold may undergo a reversible phase transition to a solid or semi-solid. In addition, the porous cell scaffold may be insoluble.

The porous cell scaffold according to one embodiment is particularly suitable for tissue engineering, repair or regeneration. The difference in porosity can enable the migration of different 　cells 　 types to the appropriate sites of the 　porous cell scaffold. In another embodiment, the difference in porosity may enable the development of a connection between a cell and a cell that is appropriate among the cell types including the porous cell scaffold, which is required for proper structuring of the development/repair/regeneration tissue. For example, the expansion of 　cells 　 treatment can be more appropriately controlled through various porosities of the 　porous cell support material. Therefore, the 　porous cell scaffold may contain any tissue 　 cells.

The use of the porous cell scaffold according to an embodiment may include tissue engineering, 3D cell culture, or cell transport for therapeutic use.

In one embodiment, the porous cell scaffold may be one in which cells are dispensed. The cells distributed in the porous cell support according to an embodiment may include a group consisting of bacterial cells, yeast cells, mammalian cells, insect cells, and plant cells.

Such cells, e.g., eukaryotic cells, are yeast, fungi, protozoa, plants, higher plants and insects, or cells of amphibians, or cells of mammals such as CHO, HeLa, HEK293, and COS-1. It can be, for example, cultured cells (in vitro), transplanted cells (graft cells) and primary cell culture (in vitro and ex vivo), and in vivo ( in vivo) cells, and also mammalian cells, including humans. In addition, the organism may be yeast, fungi, protozoa, plants, higher plants and insects, amphibians, or mammals.

Cells dispensed in the porous cell scaffold according to one embodiment, chondrocytes; Fibrochondral cells; Bone cells; Osteoblasts; Osteoclast; Synovial cells; Bone marrow cells; Nerve cells; Fat cells; Mesenchymal cells; Epithelial cells, hepatocytes, muscle cells; Stromal cells; Vascular cells; Stem Cells; Embryonic stem cells; Mesenchymal stem cells; Progenitor cells derived from adipose tissue; Peripheral blood progenitor cells; Stem cells isolated from adult tissue; It may include any one selected from induced pluripotent stem cells (iPS cells), tumor cells derived therefrom, and combinations thereof.

The porous cell support may further include a growth factor, a growth stimulator, a physiologically active substance, or a peptide or polysaccharide as a cell binding mediator for inducing the differentiation or proliferation of the divided cells.

In one embodiment, the growth factor or growth stimulator is a cell 　 adhesion mediator; Biologically active ligands; Integrin binding sequence; Ligand; Various growth and/or differentiation agents (e.g., epithelial cell 　 growth factor, IGF-I, IGF-II, TGF-[beta], growth and differentiation factor, matrix-derived factor SDF-1; vascular endothelial growth factor, fibroblast 　 growth factor , Platelet-derived growth factor, insulin-derived growth factor and deformable growth factor, parathyroid hormone, parathyroid hormone-related peptide, bFGF; nerve growth factor (NGF) or muscle-forming factor (MMF); heparin-binding growth factor (HBGF), modified growth factor Alpha or beta, alpha fibroblast growth factor (FGF), epithelial cell growth factor (TGF), vascular endothelial growth factor (VEGF), SDF-1; TGF[beta] superfamily factor; BMP-2; BMP-4; BMP-6; BMP-12; Sonic Hedgehog; GDF5; GDF6; GDF8; PDGF); Small molecules that affect the upregulation of specific growth factors; Tenasine-C; Hyaluronic acid; Chondroitin sulfate; Fibronectin; Decorin; Thromboplastin; Thrombin-derived peptide; TNF alpha/beta; Matrix metalloproteinase (MMP); Heparin-binding domain; Heparin; Heparan sulfate; DNA fragments, DNA plasmids, short interfering RNA (siRNA), transfectants, or any mixture thereof may be included.

In another aspect, the steps of crosslinking the proteins in the serum or plasma protein aqueous solution by treating the separated aqueous serum or plasma protein aqueous solution with a crosslinking agent; Reacting the protein in the cross-linked serum or plasma protein aqueous solution with a reducing agent to obtain a reactant; And homogenizing the reaction product to obtain a serum-derived protein.

In the step of treating the isolated serum or plasma protein aqueous solution with a crosslinking agent, the specific activity of the crosslinking agent is approximately 2 to 100 unit/mg, 7 to 95 unit/mg, 12 to 90 unit/mg, 17 to 85 unit/mg , 22 to 80 unit/mg, 27 to 75 unit/mg, 32 to 70 unit/mg, 37 to 65 unit/mg, 42 to 60 unit/mg, 47 to 55 unit/mg, 2 to 50 unit/mg, 7 to 45 unit/mg, 12 to 40 unit/mg, 17 to 35 unit/mg, 22 to 30 unit/mg, 50 to 100 unit/mg, 55 to 95 unit/mg, 60 to 90 unit/mg, 65 To 85 unit/mg, 70 to 80 unit/mg, 2 to 30 unit/mg, 7 to 25 unit/mg, 12 to 20 unit/mg, 30 to 60 unit/mg, 35 to 55 unit/mg, 40 to 50 unit/mg, 60 to 100 unit/mg, 65 to 95 unit/mg, 70 to 90 unit/mg, 75 to 85 unit/mg.

In the present specification, the specific activity may mean a unit unit per substrate protein (serum or protein in serum in the present specification).

In the step of reacting the protein in the serum or plasma protein aqueous solution with a reducing agent, the concentration of the reducing agent is approximately 5 to 50 mM, 10 to 45 mM, 15 to 40 mM, 20 to 35 mM, 25 to 30 mM, 5 to 25 mM. , 10 to 20 mM, 25 to 50 mM, 30 to 45 mM, 35 to 40 mM. The reaction with the reducing agent may be performed at 20 to 40 °C.

In the step of homogenizing the reaction product to obtain a serum-derived protein, the homogenization may be performed in a tissue grinder (homogenizer). The step may also include homogenizing and centrifuging to recover a suspension of serum-derived proteins.

In another embodiment, it may further comprise the step of aging the serum-derived protein. The aging step includes washing the serum-derived protein; And aging the washed serum-derived protein at 1 to 15°C.

In another embodiment, the method may further include shaping and freeze-drying the aged serum-derived protein. The molding may be performed in a casting mold having a desired shape and size. The freeze-drying may include freezing at -40°C to -240°C for 1 minute to 3 hours, and then drying.

In addition, the method includes washing the dried serum-derived protein with an aqueous solution or an organic solvent to wash impurities other than the protein; Alternatively, it may include the step of immersing the washed serum-derived protein in a preservative solution.

The porous cell support according to an embodiment has an effect of stably and continuously culturing cells, as well as exhibiting a culture pattern suitable for the characteristics of cells for each cell. In addition, the porous cell support according to an embodiment has an effect that can be cultured for a long period of time even with the conventional 2D culture method of culturing in cell culture dishes and plates.

One aspect, a porous cell scaffold; And it relates to a composition for tissue repair or regeneration comprising the cells dispensed in the porous cell scaffold.

The cells dispensed in the porous cell scaffold may be a three-dimensional cultured three-dimensional cell aggregate.

As used herein, the term "cellular therapeutic agent" refers to a drug (US FTA regulation) used for treatment, diagnosis, and prevention of cells and tissues manufactured through isolation, culture and special manipulation from humans. Or, in order to restore the function of the tissue, these cells can be used for the treatment, diagnosis and prevention of diseases through a series of actions such as proliferating and selecting live autologous, allogeneic, or xenogeneic cells out of the world or changing the biological characteristics of the cells by other methods. It means a drug used for the purpose.

The term “treatment” refers to, or includes the alleviation, inhibition of progression, or prevention of a disease, disorder or condition, or one or more symptoms thereof, and a “pharmaceutically effective amount” refers to the alleviation of a disease, disorder or condition, or one or more symptoms thereof. , Can mean any amount of the composition used in the process of practicing the invention provided herein sufficient to inhibit or prevent progression.

The terms “administering,” “applying”, “introducing” and “implanting” are used interchangeably and in a method or route that results in at least partial localization of a patch or composition to a desired site according to one embodiment. It may mean the placement of a patch or composition according to an embodiment into an individual by.

As used herein, the term "cell aggregate" or "three-dimensional cell aggregate" refers to a state in which two or more cells are concentrated, and may be a tissue state or a multicellular state. Each cell aggregate may exist as a tissue itself or a part, or as an aggregate of multiple cells, and may include a cell-like-organism differentiated from stromal cells.

In the present specification, the term "three-dimensional" may mean a three-dimensional model having three geometric parameters (eg, depth, area, height, or X, Y, Z axis) not two-dimensional. have. The three-dimensional cell aggregate may mean a cell aggregate formed of a multilayer or spherical shape of cells, not a cell aggregate formed of a single layer of cells like a general cell aggregate.

The tissue may be heart, joint, bone, blood vessel, stomach, liver, skin, kidney, cartilage, intestine, nerve, or pancreas. A person skilled in the art may dispensing somatic cells or stem cells corresponding thereto into the porous cell scaffold for reconstruction of a desired tissue. Alternatively, the same method can be applied for the study of tumor cells derived from the tissue.

The porous cell scaffold according to an embodiment has a high engraftment rate upon implantation in a living body and can form a three-dimensional cell aggregate or differentiate into tissues, so that it has an effect that can be usefully used for tissue repair or regeneration. In addition, since the porous cell scaffold according to an embodiment has a stable cell culture ability even in freezing and thawing, there is an effect that can be usefully used in the commercialization of cell therapy products.

The three-dimensional cell aggregate may be a spherical or sheet having a size that can be identified with the naked eye, for example, a spherical three-dimensional cell aggregate having a diameter of approximately 300 to 2000 μm, and in one embodiment, 300 to 1000 It may be µm. The diameter of the spherical three-dimensional cell aggregate can be adjusted to a size that can be visually identified by a person skilled in the art by the culture method according to one embodiment. In addition, the spherical three-dimensional cell aggregate according to an embodiment may include approximately 3.0Х10 ⁵ to 1.0Х10 ⁶ cells within 400 μm in diameter. In addition, in one embodiment, the three-dimensional cell aggregate may secrete various proteins and functional substances.

Accordingly, the three-dimensional cell aggregate according to an embodiment may be usefully used as a cell source when supplying a cell therapy agent or a physiologically active substance, and hereinafter, the use of the three-dimensional cell aggregate is as follows.

As described above, since the three-dimensional cell aggregate can secrete epithelial cell growth factors, various proteins and functional substances, it is implanted into an individual in need thereof and serves as a cell supply source to promote skin regeneration or angiogenesis. can do. In addition, it can be usefully used in a pharmaceutical composition for preventing and treating diseases related to heart, stomach, liver, skin, kidney, cartilage, intestine, nerve, or pancreas by promoting tissue regeneration or tissue renewal.

The heart-related diseases may include, for example, angina pectoris, myocardial infarction, cardiomyopathy, valve disease, aortic disease, and arrhythmia. The gastrointestinal diseases may include gastritis, gastric ulcer, gastric cancer, gastric adenoma, Helicobacter pylori infection, and gastric MALT lymphoma. The liver-related diseases may include hepatitis, sarcoidosis, fatty liver, alcoholic liver disease, liver cancer, liver cirrhosis, pregnancy toxicosis, non-Hodgkin's lymphoma, Wilson's disease, Reye syndrome, other neonatal jaundice, hepatic flukes, liver abscesses and hemangiomas. The skin-related diseases include eczematous skin disease, erythema, urticaria, weak rash, papule scale disease, insect and parasite mediated disease, superficial cutaneous mycosis, bacterial infection disease, viral disease, adult disease, autoimmune blister disease, connective tissue Disease, dyspigmentation, acne, rosacea, and skin tumors. The kidney-related diseases include acute kidney injury (acute kidney failure), chronic kidney disease (chronic kidney failure), end-stage chronic kidney failure, chronic glomerulonephritis, rapidly progressive glomerulonephritis, acute glomerulonephritis, acute nephritis, acute interstitial nephritis, chronic interstitial nephritis. , Hematuria, proteinuria, asymptomatic urinary dysfunction, nephrotic syndrome, acute pyelonephritis, tubular defect, hereditary kidney disease, kidney stones, hydronephrosis, nephrogenic diabetes insipidus, renal cell carcinoma, transitional epithelial cell carcinoma, angiomyolipoma, autosomal dominant polycystic nephroma , Simple cysts and kidney tuberculosis. The cartilage-related diseases may include degenerative arthritis, post-traumatic arthritis, detachable osteochondritis, and osteomalacia. The intestinal-related diseases include ulcers, enteritis, bleeding, tumors, intestinal adhesions, intestinal obstruction, bowel paralysis, colon cancer, colon polyps, irritable growth syndrome, ulcerative colitis and Crohn's disease, tuberculosis, infectious diarrhea and colitis, vascular growth disease, and It may include colon diverticulum syndrome. The neurological diseases may include congenital malformations, cancer, infection, trauma, bleeding, and autoimmune diseases. The pancreatic-related diseases may include diabetes, acute pancreatitis, chronic pancreatitis, and pancreatic cancer.

The dosage of the cell therapy agent or pharmaceutical composition according to one embodiment is approximately 1.0 to 10 ⁵ to 1.0 to 10 ⁸ cells/kg (body weight), or 1.0 to ^{10 7 to 1.0 based on the three-dimensional cell aggregate constituting the active ingredient.} It may be Х 10 ⁸ cells/kg (body weight). However, the dosage may be variously prescribed depending on factors such as the formulation method, the mode of administration, the patient's age, weight, sex, pathological condition, food, administration time, route of administration, excretion rate, and response sensitivity. In consideration of these factors, the dosage can be appropriately adjusted. The number of times of administration may be one time or two or more times within the range of clinically acceptable side effects, and the administration site may be administered to one or two or more sites. For non-human animals, the same dose per kg as human or, for example, the volume ratio (e.g., average value) of the target animal and human organs (heart, etc.) One amount can be administered. Examples of animals to be treated according to one embodiment include humans and mammals for other purposes, and specifically, humans, monkeys, mice, rats, rabbits, sheep, cows, dogs, horses, pigs, and others. Includes companion animals.

The cell therapy agent or pharmaceutical composition according to an embodiment may include a cell aggregate and a pharmaceutically acceptable carrier and/or additive as an active ingredient. For example, sterile water, physiological saline, conventional buffers (phosphoric acid, citric acid, other organic acids, etc.), stabilizers, salts, antioxidants (ascorbic acid, etc.), surfactants, suspending agents, isotonic agents, or preservatives, etc. can do. For topical administration, it is also preferable to combine organic substances such as biopolymers, inorganic substances such as hydroxyapatite, specifically collagen matrix, polylactic acid polymers or copolymers, polyethylene glycol polymers or copolymers, and chemical derivatives thereof. . When the cell therapy or pharmaceutical composition according to an embodiment is prepared in a dosage form suitable for injection, the cell aggregate may be dissolved in a pharmaceutically acceptable carrier or frozen in a dissolved solution state.

The composition for tissue reconstruction or repair, cell therapy, or pharmaceutical composition according to an embodiment, if necessary according to the administration method or formulation, is a suspending agent, a solubility aid, a stabilizer, an isotonic agent, a preservative, an adsorption inhibitor, a surfactant, Diluents, excipients, pH adjusters, painless agents, buffers, reducing agents, antioxidants, and the like may be appropriately included. Pharmaceutically acceptable carriers and formulations suitable for the present invention, including those exemplified above, are described in detail in Remington's Pharmaceutical Sciences, 19th ed., 1995.

The composition for tissue reconstruction or repair, cell therapy, or pharmaceutical composition according to an embodiment is a pharmaceutically acceptable carrier and/or according to a method that can be easily carried out by a person of ordinary skill in the art to which the present invention pertains. Alternatively, it may be prepared in a unit dosage form by formulation using an excipient, or may be prepared by placing it in a multi-dose container. In this case, the formulation may be in the form of a solution, suspension, or emulsion in an oil or aqueous medium, or may be in the form of powder, granules, tablets, or capsules.

Another aspect provides a three-dimensional culture system for drug screening comprising a three-dimensional cell aggregate according to an embodiment.

In another aspect, the steps of forming a three-dimensional cell aggregate by dispensing cells on a porous cell support and culturing them in three dimensions; And it provides a method for evaluating the pharmacological activity or toxicity of the candidate substance comprising the step of treating the candidate substance to the three-dimensional cell aggregate.

The candidate substances include, for example, a test compound or a test composition, a small molecule compound, an antibody, an antisense nucleotide, a short interfering RNA (siRNA), a short hairpin RNA ( Short hairpin RNA, shRNA), nucleic acid (Nucleic acid), protein (Protein), peptide (Peptide), other extracts (Extract) or may include a natural product (Nature product).

The three-dimensional cell aggregate has an artificial cell morphology that mimics an in vivo environment, and can be usefully used for actual cell morphology and function studies, or therapeutic agents (eg, skin diseases or vascular diseases). Accordingly, the three-dimensional culture system for drug screening including the three-dimensional cell aggregate can replace animal experiments in tests for the efficacy of treatments for diseases such as pharmaceuticals or cosmetics, or tests for inflammation and allergy.

In another aspect, the steps of forming a three-dimensional cell aggregate by dispensing cells on a porous cell support and culturing them in three dimensions; And it provides a method for producing a target material comprising the step of separating the target material from the culture or culture medium of the three-dimensional cell aggregate.

The target substance may be a target protein.

The culture may be cultured in a medium containing a carbon source.

As used herein, the term “carbon source” refers to a fermentable carbon substrate preferred as an energy source of a host organism or a microorganism such as one that can be metabolized by a cell line or produced in a particularly purified form or raw material such as a source carbohydrate, a complex nutrient substance, etc. It means a source selected from the group consisting of monosaccharides, oligosaccharides, polysaccharides, alcohols including glycerol, provided as substances. The carbon source can be used according to the invention as a single carbon source or as a mixture of different carbon sources.

The term "Product of interest (POI)" as used herein refers to a polypeptide or protein produced by recombinant technology in a host cell. More specifically, the 　 protein may be a polypeptide that does not occur naturally in the host 　 cell (i.e., heterologous 　 protein), or may be natural to the host 　 cell (i.e., homologous 　 protein to the host 　 cell), for example, By transformation with a self-replicating vector containing a nucleic acid sequence encoding POI, or by integration by recombinant techniques of one or more copies of a nucleic acid sequence encoding POI into the genome of a host cell, or, for example, by a promoter It is produced by recombinant modification of one or more regulatory sequences that regulate the expression of the gene encoding the POI of the sequence. In some cases, the term POI, as used herein, refers to any product of metabolism by a host cell as mediated by a protein expressed recombinantly. Specifically, POI is a eukaryotic 　 cell 　 protein, preferably a mammalian 　 protein. POI is a heterologous recombinant polypeptide or protein produced as a protein secreted from eukaryotic cells, preferably yeast cells. Examples of proteins include immunoglobulins, immunoglobulin fragments, aprotinin, tissue factor pathway inhibitors or other protease inhibitors, and insulin or insulin precursors, insulin analogs, growth hormones, interleukins, tissue plasminogen activators, transforming growth factor a or b, glucagon, glucagon-like peptide 1 (GLP-1), glucagon-like peptide 2 (GLP-2), GRPP, factor VII, factor VIII, factor XIII, platelet-derived growth factor 1, serum albumin, enzyme, eg For example, lipases or proteases, or functional analogs, functional equivalent variants, derivatives and biologically active fragments having a function similar to that of a natural protein. POI may be structurally similar to a natural 　 protein, and the addition of one or more amino acids to either or both of the C- and N-terminus or to the side chain of a natural 　 protein, one or more at one or many different sites in the natural amino acid sequence. It may be derived from a natural protein by substitution of amino acids, deletion of one or more amino acids at one or both ends of the natural protein or at one or several sites in the amino acid sequence, or insertion of one or more amino acids at one or more sites in the natural amino acid sequence. . Such modifications are known for some of the aforementioned proteins.

The POI produced in accordance with the present invention may be a multimer, a protein, preferably a dimer or a tetramer. POIs are therapeutic 　 proteins, enzymes and peptides, 　 antibiotics, toxin fusions 　 proteins, carbohydrate-proteins 　 conjugates, structural 　 proteins, modulators 　 proteins, vaccines and vaccine-like 　 proteins 　 or particles, process enzymes, growth factors, including antibodies or fragments thereof It is a recombinant or heterologous protein selected from hormones and cytokines or metabolites of POI. A specific POI is an antigen-binding molecule such as an antibody or a fragment thereof. Among the specific POIs, monoclonal antibodies (mAb), immunoglobulins (Ig) or immunoglobulin class G (IgG), heavy chain antibodies (HcAb') or fragments thereof, such as fragment-antigen binding (Fab), Fd, Single chain variable fragment (scFv), or engineered variant thereof, such as Fv dimer (diabody), Fv trimer (triabody), Fv tetramer or minibody and VH or VHH or V-NAR, etc. It is an antibody such as a single-domain antibody.

POI can be produced using a recombinant host cell line by culturing the transformant thus obtained in an appropriate medium, isolating the expressed product or metabolite from the culture, and optionally purifying it by a suitable method.

The transformant according to the present invention can be obtained by introducing such vector DNA, for example, plasmid DNA, into a host, and selecting a transformant that expresses POI or host cell metabolite in high yield. The host 　 cell is treated so that foreign DNA can be introduced by the commonly used 　 method for transformation of eukaryotic 　 cells, such as the electric pulse method, protoplast 　 method, lithium acetate 　 method, calcium chloride method 　 and its modifications 　 method 　.

Preferred host 　 cell line according to the present invention maintains the genetic characteristics used according to the present invention, 　 production 　 level is high, for example, about 20 passages 　 culture, at least 30 passages culture, at least 50 passages 　 culture 　 maintained at at least ㎍ level even after do.

The method disclosed herein may further comprise culturing the recombinant host cell under conditions that allow the expression of POI in a secreted form or as an intracellular product. Subsequently, recombinantly produced POI or host cell metabolites can be isolated from the cell cell culture medium and further purified by techniques known to those skilled in the art.

POI produced in accordance with the present invention can be isolated and purified using conventional state of the art conditions, which includes increasing the desired POI concentration and/or decreasing the concentration of at least one impurity.

When POI is secreted from 　 cells, it can be isolated and purified from 　cells 　 medium using the state of the art. The secretion of the recombinant expression product from the host cell is not a complex mixture of proteins, which occurs when the yeast cell is crushed to release the protein in the cell, but is recovered from the culture and the supernatant. It is advantageous.

In addition, 　 cultured transformant 　 cells can be crushed ultrasonically or mechanically, enzymatically or chemically to obtain a 　cell 　 extract containing the target POI, from which POI is separated and purified.

Separation and purification methods for obtaining a recombinant polypeptide or protein product include a method using a difference in solubility (e.g. salting out and solvent precipitation), a method using a difference in molecular weight (e.g., ultrasonic and gel electrophoresis). , 　 method using charge difference (e.g., ion exchange chromatography), method using specific affinity 　 method (e.g. affinity chromatography), method using hydrophobicity difference (e.g. reverse phase high performance liquid chromatography ) And a method using the isoelectric point difference (eg, isoelectric point electrophoresis), and the like may be used.

The highly purified product is essentially free of contaminants and proteins, and preferably has a purity of at least 90%, more preferably at least 95% or at least 98%, 100% or less. The purified product can be obtained from 　cells 　 fragments by purification of 　cells 　 cultivation 　 supernatant.

As the isolation and purification method, the following standard methods are preferable: 　cell 　 destruction (when POI is obtained in 　 cells), 　 cell (debris) separation and washing or centrifugation by microfiltration or tangential flow filter (TFF), precipitation or heat POI purification by treatment, POI activation by enzymatic digestion, chromatography, e.g. ion exchange (IEX), hydrophobic interaction chromatography (HIC), affinity chromatography, size exclusion (SEC) or HPLC chromatography POI purification by, concentration of POI precipitation and washing by ultrafiltration steps.

The isolated and purified POI can be identified by conventional methods, for example, Western blotting, HPLC, activity analysis or ELISA.

In general, the host cell expressing the recombinant product may be any eukaryotic cell suitable for recombinant expression of POI. Examples of mammalian cells are BHK, CHO (CHO-DG44, CHO-DUXB11, CHO-DUKX, CHO-K1, CHOK1SV, CHO-S), HeLa, HEK293, MDCK, NIH3T3, NS0, PER.C6, SP2/0 And VERO cells. Examples of yeast used as host cells are, but are not limited to, genus Saccharomyces (eg, Saccharomyces cerevisiae), genus Pichia (eg, P. pastoris or P. metanolica). ), Komagataella genus (K. Pastoris, K. Pseudopastoris or K. Papy), Hansenula polymorpha or Kluyveromyces lactis.

The porous cell scaffold according to an embodiment not only can stably and continuously cultivate cells, but also exhibits a culture pattern suitable for the characteristics of cells for each cell to simulate real tissues, and has a stable culture and high in vivo engraftment rate. , There is an effect that can be usefully used in the evaluation of drug activity and toxicity using organoids, cell therapy products, or the production of a protein of interest.

1 is a result of culturing the SNU017 gastric cancer cell line for 9 days using a porous cell support according to an embodiment.
2 is a result of culturing a SiHA cervical cancer cell line for 14 days using a porous cell support according to an embodiment.
3 is a result of culturing hACs (chondrocytes) for 7 days using a porous cell scaffold according to an embodiment.
4 is a result of culturing intestinal endocrine cells for 13 days using a porous cell scaffold according to an embodiment.
Figure 5 is a week after injecting the three-dimensional cell aggregates of enteroendocrine cells (Enteroendocrine Cell: EEC) using a porous cell support according to an embodiment into the kidney membrane of a mouse.
6 is a result of performing a freeze-thaw test after culturing liver cancer cells for 12 days using a porous cell support according to an embodiment.
7 is a graph comparing the expression levels of albumin from liver cancer cells cultured using a porous cell support according to an embodiment and liver cancer cells cultured in a positive control group using an ELISA method.

Hereinafter, preferred embodiments are presented to aid in understanding the present invention. However, the following examples are provided for easier understanding of the present invention, and the contents of the present invention are not limited by the following examples.

Example 1. Preparation of a porous cell scaffold

Porous cell scaffolds using serum-derived proteins are prepared as follows.

First, the serum protein was reduced with a crosslinking agent and a reducing agent with a crosslinking agent. Specifically, in a clean booth of Class 100 or less, 1 mg/ml microviral transglutaminase (specific activity unit 20 U/mg, Sigma Aldrich) was treated with the same amount of fetal bovine serum or bovine serum. Thereafter, dithiothreitol (DTT, Sigma Aldrich) as a reducing agent was added to a final concentration of 15 mM and reacted at 37° C. for 12 hours to prepare a reaction product. Thereafter, washing buffer (6M urea and 0.1M sodium acetate, pH 5.0) was added to the reaction product, homogenized with an electric tissue grinder (Homogenizer D1000, Benchmark Scientific), and centrifuged to recover a suspension of serum-derived protein. After washing the suspension with lactic acid, it was stirred at 10,000 rpm for 20 minutes using a high-speed stirrer (MaXtir® 500S, DAIHAN-brand®), and aged at 4° C. for 8 hours. In order to shape the aged serum-derived protein into a desired shape, it was transferred to a casting mold, frozen at -80°C for 1 hour, and then freeze-dried for 24 hours. Thereafter, the dried serum-derived protein was washed 5 times with 100% ethanol and sterilized tertiary distilled water at room temperature to wash impurities other than the serum-derived protein to prepare a porous cell support of the serum-derived protein. In subsequent experiments, the porous cell support of the serum-derived protein was immersed in a preservative solution (1XPBS, cell culture media, DW, etc.) and used.

The characteristics of the prepared cell scaffold are shown in Table 1 below.

Pore size Average diameter of about 200㎛ (100 to 400㎛) pH About 7.0 to 7.4 when suspended in PBS or tissue culture medium Storage temperature Room temperature

Experimental Example 1. Three-dimensional culture of cancer cells using a porous cell support The cancer cells were cultured using the porous cell support prepared in Example 1 to confirm culture stability and persistence.

Specifically, in order to remove the preservation solution from the porous cell support prepared in Example 1 as much as possible, 1x PBS was added so that the porous cell support was sufficiently immersed, rinsed by gently shaking, and then 1x PBS was removed. This was repeated once more to remove the preservative. Thereafter, a gastric cancer cell line SNU017 (KCLB) and a cervical cancer cell line SiHA (KCLB) were dispensed ^{into the porous cell scaffold at a number of 5 x 10 5 cells.} Thereafter, the porous cell support from which the cells were dispensed was cultured in an incubator at _{37° C. and 5% CO 2 in a cell culture solution (RPMI, Gibco).}

A paraffin block was formed on the 9th day of culture and the 14th day of culture, and was made into a slide, followed by H&E staining to perform histological examination, and the results are shown in FIGS. 1 and 2.

As shown in FIG. 1, as a result of culturing the SNU017 cell line for 9 days using the porous cell scaffold, it was confirmed that it was cultured to form a spherical cancerous tissue structure similar to that in the actual tissues in the body.

In addition, as shown in FIG. 2, as a result of culturing the SiHA cell line for 14 days using the porous cell support, it was confirmed that it was cultured to form a cancerous tissue structure in the form of a desk tissue similar to that of the tissue in the actual body.

Experimental Example 2. Three-dimensional culture of chondrocytes using a porous cell scaffold

Chondrocytes are generally known to be difficult to culture in vitro. In this example, chondrocytes were cultured using the porous cell scaffold prepared in Example 1 to confirm culture stability and persistence.

Specifically, cartilage cells were three-dimensionally cultured in the same manner as in Experimental Example 1, except that chondrocytes (hACs) collected from actual patients were ^{dispensed in a number of 5 x 10 5 cells.}

Thereafter, Live and Dead Cell staining was performed on the three-dimensional cultured chondrocytes on the 7th day of culture. Thereafter, the stained cells were confirmed with a confocal laser microscope (LSM880 with Airyscan, Zeiss), and the results are shown in FIG. 3. In FIG. 3, green indicates live cells and red indicates dead cells.

Z1 to Z9 of FIG. 3 mean fluorescence imaging of cross-sections every 10 μm in height along the vertical axis.

As shown in Fig. 3, it can be observed that dead cells indicated in red for one week were not observed and were stably cultured. Patient-derived chondrocytes cultured on the porous cell scaffold according to one embodiment showed a high survival rate.

Experimental Example 3. Three-dimensional culture of intestinal endocrine cells using a porous cell scaffold

Intestinal endocrine cells were cultured using the porous cell scaffold prepared in Example 1 to confirm culture stability and persistence.

Specifically, enteroendocrine cells were three-dimensionally cultured in the same manner as in Experimental Example 1, except that Enteroendocrine Cells collected from mice were ^{dispensed in a number of 5 x 10 5 cells.}

Thereafter, DAPI and Hematoxylin & Eosin (H&E) staining were performed on 3D cultured intestinal endocrine cells on the 11th and 13th days of culture. The stained cells were confirmed with a fluorescence microscope (Axiovert 200, Zeiss), and the results are shown in FIG. 4.

As shown in FIG. 4, it is usually difficult to cultivate enteroendocrine cells for more than a week, but the three-dimensional cell aggregate of enteroendocrine cells cultured on a porous cell support according to one embodiment was stably cultured without deteriorating cell status for more than 2 weeks. Could know.

As a result of the above, it was found that the porous cell support according to an embodiment not only can stably and continuously cultivate cells, but also a culture pattern suitable for the characteristics of cells for each cell is observed. In addition, it was found that the conventional 2D culture method of culturing in cell culture dishes and plates has the effect of long-term cultivation.

Experimental Example 4. Engraftment rate of a three-dimensional cell aggregate using a porous cell scaffold

In this example, in order to apply the porous cell scaffold prepared in Example 1 to tissue regeneration treatment, the engraftment rate of the three-dimensional cell aggregate of enteroendocrine cells to the kidney membrane was measured.

Specifically, cells as in Example 3 were cultured in the same manner, and then transplanted into the kidney membrane of a mouse with a Hamilton syringe. One week after transplantation, the mice were euthanized, and the kidneys were separated and dissected, and the remaining amount was directly observed. Later, only the transplanted part was removed, its wet weight was measured, the engraftment rate was confirmed by the number of engrafted cells, a paraffin block was formed, and H&E staining was performed by performing H&E staining. The results are shown in FIG. 5.

As shown in Figure 5, the cell body obtained by culturing enteroendocrine cells in FBS free for 2 weeks on a porous cell support according to an embodiment was transplanted into the kidney membrane of a mouse, and cultured for 1 week, resulting in more than about 80% The survival rate was confirmed.

Considering that the in vivo engraftment rate is typically less than 5% when stem cells are injected, it can be seen that the porous cell scaffold according to an embodiment can be usefully used in cell therapy for tissue regeneration.

Experimental Example 5. Freeze-thawing test of a three-dimensional cell aggregate using a porous cell support

In this example, a freeze-thawing experiment was performed to confirm that the porous cell scaffold prepared in Example 1 is easy to commercialize and transport in order to be practically used for commercialization of tissue regeneration treatment.

Specifically, lung cancer cell lines NCI-H28 and NCI-H2170 (KCLB) were ^{dispensed in a number of 5 x 10 5} cells to the porous cell support according to an embodiment, and then cultured for 28 days. Frozen storage was stored in a freezing solution (Media: FBS: DMSO, 5:4:1) at Deepfreezer -80 °C for 30 days, then thawed and incubated for 12 days. Thereafter, H&E staining was performed on the cells cultured on the scaffold, and the results are shown in FIG. 6.

As shown in FIG. 6, even if the porous cell support according to an embodiment is frozen or thawed, it was confirmed that the cells can be rearranged.

These results mean that the porous cell support according to an embodiment has an advantageous effect on commercialization and transport as a cell therapy agent.

Experimental Example 6. Protein production using a porous cell scaffold

To analyze whether a useful substance (target protein) can be produced using the porous cell support prepared in Example 1, the protein production ability of the three-dimensional cell aggregate of liver cancer cells was measured.

^{Specifically, HepG2 cells were dispensed in a number of 5 x 10 5} cells in a 24-well plate, and then cultured in MEM (10% FBS added) medium for 7 days, 14 days and 21 days. Thereafter, the concentration of albumin in the cell culture was measured by the method of Human ALB solid-phase sandwich ELISA (enzyme-linked immunosorbent assay). As a control, a conventional two-dimensional cell culture method was performed. Two-dimensional cell culture was performed in a 6 well plate. In addition, Matrigel ^® (Corning, 356231) and Alvetex™ (ReproCell, Glasgow, UK) were used as positive controls. Specifically, cells were cultured in the same manner as above, except that the commercially available three-dimensional cell culture support was used. The concentration of albumin in the cell culture solutions of the control groups was measured, and the results are shown in FIG. 7.

As shown in FIG. 7, in the case of the porous cell scaffold according to an embodiment, the expression level of albumin indicating the degree of activation of liver cancer cells was higher than that of the case of using the ^{positive controls Matrigel ® and Alvetex™.} The above results mean that the porous cell support according to an embodiment can be usefully used in the production of a target material (protein).

Claims (1)

The separated serum is treated with transglutaminase to cross-link the proteins in the serum, then treated with a reducing agent that reduces the disulfide bonds of the proteins in the serum to homogenize the obtained reaction product, and collect the suspension by centrifugation. And, after stirring the recovered suspension, including a serum-derived protein composition obtained by leaving the stirred suspension,
The reducing agent is beta-mercaptoethanol (b-mercaptoethanol), dithiothreitol (DTT), tris (2-carboxyethyl) phosphine (TCEP)), cysteine, glutathione ( glutathione), trishydroxypropyl phosphine (Tris(3-hydroxypropyl)phosphine: THPP)), and one selected from the group consisting of a combination thereof,
The composition pore size is 150 to 400㎛,
Porous cell scaffolds for histologic use or therapeutic use through three-dimensional cell culture.

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