Patent Application
20230056844
The present invention relates to a cell culture substrate and manufacturing method thereof.
Recently, as the use of cultured cells for disease treatment is expanded, interest and research on cell culture are increasing. Cell culture is a technology for collecting cells from a living body and culturing them outside the living body. The cultured cells can be differentiated into various tissues of the body, such as skin, organs, and nerves, and then transplanted into the human body or the culture cells can be transplanted into the human body in a state before differentiation to achieve engraftment and differentiation at the same time, so that they can be used for treating various diseases.
Cultivation of mammalian cells is one of many processes in the life sciences and health sciences. As a cell culture substrate for mammalian cell culture and analysis including anchorage-dependent cells, a vessel such as a well-plate made of, for example, a high molecular polymer or glass, or a plate such as a film, is often used. Here, additional surface treatment is required to allow the cells to adhere to the surface of the vessel or plate. Such surface treatment may include, for example, forming an adsorption layer on the surface or implementing an appropriate surface shape by adsorption, grafting, or plasma polymerization techniques. Alternatively, the surface treatment may be achieved through chemical modification of the surface itself of the container or plate, for example, atmospheric corona, radio frequency vacuum plasma, DC glow discharge, and microwave plasma treatment.
On the other hand, current methods for culturing, differentiating, cross-differentiating, and reprogramming various stem cells including, for example, adult stem cells (ASCs) and pluripotent stem cells and somatic cells, generally require complex culture environments, for example, a microenvironment similar to an extracellular matrix, to culture the stem cells. The microenvironment is formed by forming a coating layer using extracellular matrix proteins or other various proteins helpful for cell proliferation on the surface of a solid substrate.
On the other hand, the coating layer is formed by simply treating a solution containing the above-described various proteins on a cell adhesion surface such as a container or plate and then drying. However, the stability of the protein activity in the coating layer is very low, and there is a problem in that the activity is easily lost within a few hours at room temperature after the coating layer is formed. Therefore, it is difficult to manufacture a cell culture substrate having the coating layer formed in advance, and even if it is manufactured, the cell culture substrate must be stored at a low temperature, and even when stored at a low temperature, the storage days are very short, within 30 days. In addition, due to such poor storage stability, it is common to form the coating layer on the cell adhesion surface immediately before cell loading operation, which causes inconvenience in cell culture operation and prolongs the preparation time before cell culture.
The present invention has been devised in consideration of the above, and an object of the present invention is to provide a cell culture substrate which can be stored at room temperature for a long period of time over several years, exhibiting excellent storage stability, while activities of compounds that are beneficial to culturing of the cells remain unchanged or only suffer minimal degradation so that the cells can be cultured at an initially-designed level, and a method for manufacturing the same.
Further, another object of the present invention is to provide a cell culture substrate which can have an excellent cell adhesion capability and allow reliable proliferation of the cells attached thereto, and thus can achieve a high cell culture efficiency, and a method for manufacturing the same.
Furthermore, another object of the present invention is to provide a cell culture coating composition that can achieve the above excellent properties.
In order to achieve the above object, the present invention provides a cell culture substrate, including a fibrous web in which fibers are integrated, and a cell culture coating layer comprising a coating film connecting at least some of the fibers positioned on one surface of the fibrous web, wherein the cell culture coating layer is formed with a fusion protein for cell culture in which a functional peptide is bound to a mussel adhesive protein.
According to one embodiment of the present invention, the functional peptide may have a function of promoting any one or more of adhesion, migration, proliferation and differentiation of a cell.
In addition, the fibrous web may include any one or more components selected from the group consisting of polystyrene (PS), polyester, polyethersulfone (PES), polyvinylidene fluoride (PVDF), polydimethylsiloxane (PDMS), polyamide, polyimide, polyethylene and polypropylene.
In addition, the mussel adhesive protein may be any one protein selected from the group consisting of amino acid sequences of SEQ ID NO: 1 to SEQ ID NO: 14, or a protein to which one or more amino acid sequences selected from the group are linked.
The functional peptide may include an RGD sequence.
The functional peptide may be any one or more peptides selected from the group consisting of amino acid sequences of SEQ ID NO: 15 to SEQ ID NO:19, or a peptide to which one or more amino acid sequences selected from the group are linked.
In addition, the cell culture substrate may further include a support disposed on the other surface opposite to the one surface of the fibrous web.
The fibrous web may have an average diameter of 200 to 1000 nm, a thickness of 2 to 20 μm, and a basis weight of 3 to 20 g/m2.
In addition, the present invention provides a method for manufacturing a cell culture substrate, including the steps of (1) preparing an active solution containing a carbodiimide-based coupling agent and a reactive agent and a fusion protein for cell culture in which a functional peptide is bound to a mussel adhesive protein, (2) preparing a cell culture coating composition by mixing the prepared active solution and the prepared fusion protein for cell culture, and (3) forming a cell culture coating layer by treating the cell culture coating composition on a surface of a fibrous web.
According to one embodiment of the present invention, the carbodiimide-based coupling agent may be 1-ethyl-3-(3-dimethylaminopropyl carbodiimide hydrochloride (EDC) or N,N′-dicyclohexylcarboimide (DCC), and the reactive agent may be N-hydroxysuccinimide (NHS) or N-hydroxysulfosuccinimide (Sulfo-NHS).
In addition, the carbodiimide-based coupling agent and the reactive agent may be contained in the active solution in a weight ratio of 1:0.1 to 10. In the cell culture coating composition, the carbodiimide-based coupling agent may be mixed in an amount of 1:1 to 100 parts by weight with respect to 100 parts by weight of the fusion protein for cell culture.
In addition, the present invention provides a cell culture coating composition for a porous cell culture substrate which forms a coating layer that blocks at least some pores on a surface of the porous cell culture substrate, the cell culture coating composition including a fusion protein for cell culture in which a functional peptide is bound to a mussel adhesive protein, a carbodiimide-based coupling agent, and a reactive agent.
Hereinafter, the terms used in the present invention will be described.
The term “extracellular matrix (ECM)” used in the present invention is a matrix that surrounds the outside of a cell, occupies between cells, and means having a network structure mainly composed of proteins and polysaccharides.
Despite containing compounds such as proteins that are beneficial to culturing cells, the cell culture substrate according to the present invention can be stored at room temperature for a long period of time over several years, exhibiting excellent storage stability, while activities of such compounds that are beneficial to culturing of the cells remain unchanged or only suffer minimal degradation so that the cells can be cultured at an initially-designed level. Further, since the cell adhesion capability to the cell culture substrate is excellent and the cells attached thereto can be reliably proliferated, a high cell culture efficiency can be achieved. Accordingly, the cell culture substrate can be widely utilized for culturing various cells including stem cells.
Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.
The cell culture substrate according to an embodiment of the present invention includes a fibrous web in which fibers are integrated and a cell culture coating layer.
The fibrous web provides a surface to be coated for the cell culture coating layer to be described later as a support on which seeded cells can settle and proliferate. The fibrous web has a three-dimensional network structure in which fibers are integrated, and specifically, each fiber is independently folded and/or arranged without determining the fiber length direction, and by stacking them, it is possible to form a structurally more complex and various three-dimensional network structure. The complex and variously formed internal structure functions as a flow path for a culture solution containing nutrients necessary for cell proliferation, and can easily supply nutrients to the cells positioned inside the fibrous web, prevent apoptosis, and promote cell proliferation.
In this case, adhesion or fusion may occur between different surfaces within a single-stranded fiber and/or between the surfaces of different fibers, and through this, the three-dimensional network structure may be more structurally stabilized.
In addition, the surface of the fibrous web formed by randomly arranging and accumulating fibers can induce a three-dimensional culture of cells by the surface morphology. As an example of the surface morphology, the surface of the fibrous web may not be flat, and an uneven surface may be formed on the surface, and the surface roughness may be large. The roughness of the surface shape of the fibrous web includes, for example, a plurality of concave and/or convex portions. Thus, in addition to the effect of the three-dimensional growth of cells, the cells can be more easily and firmly seated in the space between the convex portions or the grooves of the concave portions. Accordingly, it has an advantage of significantly reducing the number of cells detached after being seated on the cell culture sheet.
For the fibers forming the fibrous web, materials commonly used in cell culture may be used without limitation. As an example, the fiber may include any one or more components selected from the group consisting of polyester such as polystyrene (PS), polyethylene terephthalate and polycarbonate, fluorine-based compounds such as polyethersulfone (PES), polyvinylidene fluoride (PVDF), polydimethylsiloxane (PDMS), polyamide, polyimide, polyethylene, and polypropylene. However, in consideration of both cell proliferation and recovery, the fiber may include a fluorine-based compound, of which polyvinylidene fluoride (PVDF) may be included. When the fiber is PVDF, it may be advantageous to not only have excellent cell recovery properties, but also to realize that the diameter of the cultured cell is smaller than the cell diameter at the time of seeding.
The fibrous web may be embodied in a web shape by a known method such as spunbonding or melt blown, or may be embodied through electrospinning. In addition, the fibrous web is formed of fibers having an average diameter of 10 nm to 1.5 μm, and may have a basis weight of 1 to 20 g/m2. If the average diameter of the fibers is less than 10 nm, the mechanical strength is inferior, and it may be difficult to manufacture the fibrous web. If the average diameter of the fibers exceeds 1.5 μm, the density (basis weight) of the fibrous web is reduced, and there is a risk that the surface of the fibrous web is partially melted during thermocompression bonding. In addition, since it is difficult for the fibrous web morphology to realize a topology advantageous for cell culture, there is a risk that cell culture efficiency may decrease. In addition, if the basis weight is less than 1 g/m2, there is a risk that handling is not easy when manufacturing the fibrous web. If the basis weight exceeds 20 g/m2, the fibrous web may be melted in the pressing roll, and it may be difficult to adhere to a separate support film when the fibrous web is laminated with the film to be described later to realize a cell culture sheet. In addition, if the conditions of the fiber diameter and the basis weight of the fibrous web are not satisfied, it may be difficult to realize a surface morphology suitable for cell culture, and it may be difficult to achieve the desired level of cell culture efficiency of the present invention. On the other hand, in order for the surface of the fibrous web to realize a morphology advantageous for cell culture, particularly stem cell culture, the fibrous web preferably has an average fiber diameter of 200 to 1000 nm, a thickness of 2 to 10 μm, and a basis weight of 3 to 7 g/m2. Through this, the cell culture efficiency is improved and the cultured cells can be cultured to have a smaller diameter than the diameter at the time of seeding, which is advantageous for culturing younger and better cells. In particular, if the thickness is less than 2 μm, there is a risk that the cell proliferation rate may be greatly reduced. In addition, if the thickness exceeds 10 μm, it may be difficult to observe the cells under a microscope, so it may not be easy to observe the proliferating cells.
Next, a cell culture coating layer provided on the above-described fibrous web will be described.
The cell culture coating layer is a layer that provides a cell adhesion surface capable of improving settling and proliferation after cells to be cultured are seeded. The cell culture coating layer is formed by including a function protein for cell culture in which a functional peptide is bound to a mussel adhesive protein.
Referring to
In addition, the cell culture coating layer may include a cover layer formed on at least a portion of the outer surface of some or all of the fibers forming the fibrous web as well as the coating film. In addition, the coating film may be formed to connect the spaces between some fibers of the fibers positioned inside the fibrous web or fibers positioned on the other surface of the fibrous web, as well as the fibers positioned on the surface of the fibrous web.
The cell culture coating layer, which is formed through a fusion protein for cell culture and includes a coating film that connects the spaces between fibers, is excellent in cell culture efficiency. At the same time, even when stored at room temperature for more than several years, storage stability is greatly improved as the decrease in the activity of functional peptides caused by degradation and denaturation of the fusion protein for cell culture forming the cell culture coating layer is prevented or minimized. In addition, the cell culture coating layer does not use a polymer-based adhesive component, for example, an acrylic adhesive component, and introduces a functional peptide to the surface of the cell culture substrate, so there is no cytotoxicity, and the cells can be cultured more biocompatible.
The cell culture coating layer is formed through the fusion protein for cell culture in which a functional peptide is bound to a mussel adhesive protein, and the functional peptide is a material having a function to help cell culture. Specifically, it may be a material that performs the function of promoting any one or more of cell adhesion, cell migration, cell proliferation, and cell differentiation. As the functional peptide, known peptides performing these functions may be used without limitation. Non-limiting examples include adrenomedullin, angiopoietin, bone morphogenetic protein (BMP), brain-derived neurotrophic factor (BDNF), epidermal growth factor (EGF), erythropoietin, fibroblast growth factor, glial cell line-derived neurotrophic factor (GDNF), granulocyte colony-stimulating factor (G-CSF), granulocyte macrophage colony-stimulating factor (GM-CSF), growth differentiation factor-9 (GDF9), hepatocyte growth factor (HGF), hepatoma-derived growth factor (HDGF), insulin-like growth factor (IGF), keratinocyte growth factor (KGF), migration-stimulating factor (MSF), myostatin (GDF-8), nerve growth factor (NGF), platelet-derived growth factor (PDGF), thrombopoietin (TPO), T-cell growth factor (TCGF), neuropilin, transforming growth factor-alpha (TGF-α), transforming growth factor-beta (TGF-β), tumor necrosis factor-alpha (TNF-α), vascular endothelial growth factor (VEGF), a predetermined amino acid sequence included in any one or more growth factors (GF) selected from the group consisting of IL-1, IL-2, IL-3, IL-4, IL-5, IL-6 and IL-7. Alternatively, it may include a predetermined amino acid sequence included in any one or one extracellular matrices selected from the group consisting of hyaluronic acid, heparin sulfate, chondroitin sulfate, termatin sulfate, keratan sulfate, alginate, fibrin, fibrinogen, collagen, elastin, fibronectin, vitronectin, cadherin and laminin.
For example, the functional peptide may include an RGD sequence in an amino acid sequence. In addition, the functional peptide may be any one or more peptides selected from the group consisting of the amino acid sequence of SEQ ID NO: 15 to SEQ ID NO: 19 or a peptide to which one or more amino acid sequences selected from the group are linked. In addition, the functional peptide may be a vitronectin polypeptide, a collagen polypeptide, a laminin polypeptide, a fibronectic polypeptide, or a variant thereof.
On the other hand, the functional peptide may be, for example, a peptide having a to b amino acid number, even when stored in a state contained in the coating layer at room temperature for a long time, it may be more advantageous to minimize or prevent degradation, denaturation, and the like.
In addition, the functional peptide is bound to the mussel adhesive protein, and specifically, it may be bound to the carboxy terminus, the amino terminus, or both the carboxy terminus and the amino terminus of the mussel adhesive protein. In this case, the bond may be a covalent bond, specifically, an amino bond. On the other hand, the functional peptide and the mussel adhesive protein can be bound through a known method, and for example, can be prepared through a recombinant protein production method using E. coli. On the other hand, the mussel adhesive protein and the functional peptide may be directly covalently bonded, but the present invention is not limited thereto. It is illustrated that the mussel adhesive protein and functional peptide can be indirectly bound by mediating a predetermined material such as a crosslinking agent.
The reasons for binding the functional peptide to the mussel adhesive protein is that the mussel adhesive protein is advantageous for fixing the functional peptides to the fiber surface of the fibrous web with good adhesion properties, and that there is no toxicity that may be applied to cultured cells compared to the polymer-based adhesive component and there is excellent biocompatibility as described above. In addition, there is an advantage in that the dissociation of the seeded cells can be minimized due to good adhesion properties with the seeded cells after the seeded cells are seated on the cell adhesion surface.
The mussel adhesive protein is an adhesive protein derived from mussels, and a known adhesive protein collectively referred to as a mussel adhesive protein may be used without limitation. Preferably, the mussel adhesive protein may be any one protein selected from the group consisting of the amino acid sequences of SEQ ID NO: 1 to SEQ ID NO: 14 or a protein to which one or more amino acid sequences selected from the group are linked. For example, it may be the mussel adhesive protein represented by SEQ ID NO: 13.
On the other hand, the cell culture substrate according to an embodiment of the present invention may further include a support disposed on the other surface opposite to one surface of the fibrous web. For the support, a member that supplements the mechanical strength of the fibrous web may be used without limitation. For example, the support may be a woven fabric, a knitted fabric, a non-woven fabric or a film. In addition, the material of the support is preferably a material that does not affect cell culture, for example, may be a material such as polycarbonate, polystyrene, polyethylene terephthalate, polyimide. Meanwhile, the support and the fibrous web may be attached to each other through thermal fusion by melting a portion of the support and/or a portion of the fibrous web or through a separate adhesive. In this case, the adhesive may be a silicone adhesive that can minimize the influence on cell culture.
The cell culture substrate provided with the above-described cell culture coating layer according to an embodiment of the present invention may be manufactured by the steps of (1) preparing an active solution containing a carbodiimide-based coupling agent and a reactive agent and the fusion protein for cell culture in which the functional peptide is bound to the mussel adhesive protein, (2) mixing the prepared active solution with the fusion protein for cell culture to prepare a cell culture coating composition, and (3) treating the cell culture coating composition on the surface of the fibrous web to form the cell culture coating layer.
First, as the step (1) according to the present invention, the step of preparing the active solution containing a carbodiimide-based coupling agent and a reactive agent and the fusion protein for cell culture in which the functional peptide is bound to the mussel adhesive protein is performed.
The active solution includes a carbodiimide-based coupling agent and a reactive agent, and may further include a solvent. The active solution is a material that introduces the fusion protein for cell culture to the surface of the fibrous web, and improves the adhesion between the cell culture coating layer and the surface of the cell culture substrate compared to the case where the fusion protein for cell culture is simply treated on the surface of the fibrous web by a conventional method.
For the carbodiimide-based coupling agent, a coupling agent that allows the fusion proteins to bind to each other can be used without limitation. For example, it may be 1-[3-(dimethylamino)propyl]-3-ethylcarboimide hydrochloride (EDC) or N,N′-dicyclohexylcarboimide (DCC).
In addition, the reactive agent is provided to prevent the fusion protein in a coupled state with the carbodiimide-based coupling agent from being hydrated, thereby increasing the efficiency of binding the fusion proteins to each other. For example, it may be N-hydroxysulfosuccinimide (Sulfo-NHS). On the other hand, N-hydroxysuccinimide (NHS), which is conventionally known as a reactive agent, may not be suitable to achieve the desired effect of the present invention.
The active solution may contain the carbodiimide-based coupling agent and the reactive agent in a weight ratio of 1:0.1 to 10. If they are not contained in an appropriate ratio, it is difficult to achieve the desired effect of the present invention, and there is a risk that the cell adhesion in the realized cell culture coating layer is significantly reduced.
In addition, the active solution may further contain sodium acetate to improve reactivity. In this case, the sodium acetate may be contained in an amount of 1 to 100 parts by weight based on 100 parts by weight of the carbodiimide-based coupling agent.
In addition, the active solution may further contain a solvent, and the solvent may be water or an organic solvent, for example water.
The method for preparing the active solution is not particularly limited, but, for example, the final active solution may be prepared by adding sodium acetate solution to the carbodiimide-based coupling agent solution and the reactive agent solution, respectively, and mixing them to prepare two types of solutions, and then, mixing the two types of solutions in an appropriate ratio and then inducing a reaction for 20 to 50 minutes, and then performing the reaction again for 25 to 40 minutes in an incubator at 28 to 35° C.
Next, as the step (2) according to the present invention, the step of preparing a cell culture coating composition is performed by mixing the prepared active solution and the cell culture fusion protein.
In this case, the fusion protein for cell culture and the active solution may be mixed by adjusting the content so that 1 to 100 parts by weight of the carbodiimide-based coupling agent is contained with respect to 100 parts by weight of the fusion protein for cell culture. If the amount of the carbodiimide-based coupling agent is less than 1 part by weight, cell adhesion may not occur or differentiation may occur, and if it exceeds 100 parts by weight, the cells may be detached after attachment, so it may be difficult to stably culture the cells.
In addition, the prepared active solution and the fusion protein for cell culture can be mixed, and then a reaction is induced for more than 0 to 2 hours to prepare the final cell culture coating composition.
Next, as the step (3) according to the present invention, the cell culture coating composition is treated on the surface of the fibrous web to form a cell culture coating layer.
The method of treating the prepared cell culture coating composition on the surface of the fibrous web may be a commonly used coating method. For example, dispensing using a pipette aid or impregnation may be performed. After the cell culture coating composition is treated on the surface, a reaction can be induced in an incubator at 25 to 32° C. for 30 minutes to 2 hours to form the cell culture coating layer.
Thereafter, a washing process may be further performed, and for example, the washing process may be repeated 2 to 5 times in total for 3 to 6 minutes through tertiary distilled water. After the washing process, it can be naturally dried in the air, and through this, the cell culture substrate can be manufactured.
On the other hand, the moisture content of the cell culture coating layer in the finally manufactured cell culture substrate may be less than 5% as it goes through a drying process. This characteristic is an effect expressed by using the fusion protein according to the present invention. In other words, since commercialized materials that help cell culture cannot be stored for a long time after being treated on the fibrous web, they have no choice but to be used within a few days after being treated on the fibrous web. For this reason, it is common not to go through a drying process after coating. On the other hand, the cell culture substrate according to the present invention can be stored for a long time at room temperature for several years, and as a result, the solvent remaining in the cell culture coating layer or the washing water according to the washing process evaporates, so it can show a very small moisture content.
Table 1 below shows the amino acid sequences for the above-described mussel adhesive protein and functional peptide.
The present invention will be described in more detail through the following examples, but the following examples are not intended to limit the scope of the present invention, which should be construed to aid understanding of the present invention.
A fibrous web formed of sterilized PVDF fibers having an average diameter of 260 nm, and having a basis weight of 4.5 g/m2 and a thickness of 5 μm was prepared. Thereafter, the cell culture coating composition prepared in the following Preparation Example was dispensed on the surface of the fibrous web using a pipette aid, and then reacted for one hour in an incubator at 30° C. to form a cell culture coating layer on the surface of the fibrous web. Thereafter, after washing three times for 5 minutes each using tertiary distilled water, the cell culture substrate was prepared by drying in the air with the plate lid open in a clean bench.
The fusion protein for cell culture was prepared by binding the amino terminus of the functional peptide of SEQ ID NO: 19 to the carboxy terminus of the mussel adhesive protein of SEQ ID NO: 13. In this case, the fusion protein was prepared by a recombinant protein production method using E. coli.
Meanwhile, NaOAc, NaHCO3, and 2-(N-morpholino)ethanesulfonic acid solutions dissolved in tertiary distilled water were first prepared to prepare the active solution, and then added in microtubes in which EDC and Sulfo-NHS reagents were respectively dispensed to prepare the EDC solution and Sulfo-NHS.
To prepare the cell culture coating composition, after the EDC solution was put into a conical tube, a Sulfo-NHS solution was added, and the fusion protein for cell culture was added to the prepared active solution while stirring, followed by stirring to prepare the cell culture coating composition. In this case, the cell culture coating composition contained 1 part by weight of EDC with respect to 100 parts by weight of the fusion protein for cell culture, and EDC and Sulfo-NHS were mixed in a weight ratio of 1:2, and the NaOAc contained in the coating composition was contained so as to be 100 parts by weight based on 100 parts by weight of EDC. In this case, the concentration of the fusion protein for cell culture in the cell culture coating composition was 0.05 mg/ml.
The cell culture substrate was manufactured in the same manner as in Example 1, except that the fibrous web formed of PVDF fibers having an average diameter of 500 nm, and having a basis weight of 5.8 g/m2 and a thickness of 3 μm was used.
The cell culture substrate was manufactured in the same manner as in Example 1, except that the fibrous web not coated with the cell culture coating composition was used as the cell culture substrate.
The cell culture substrate was manufactured in the same manner as in Example 2, except that the fibrous web not coated with the cell culture coating composition was used as the cell culture substrate.
The SEM photographs of the surfaces of the cell culture substrates according to Examples 1 and 2 and Comparative Examples 1 and 2 were taken and shown in
As a result of photographing, it can be observed that in Examples 1 and 2, the cell culture coating layer included the coating film connecting some of the fibers positioned on the surface.
A cell culture substrate was manufactured by coating Matrigel and Vitronectin-XF™, which are commercially available as a cell culture coating composition, on the cell culture substrate according to Comparative Example, according to the coating composition manufacturer's protocol.
After dispensing the same amount of induced pluripotent stem cells to the cell culture substrates according to Example 1, Comparative Examples 3 and 4, the cells were cultured in stem cell culture medium (StemMACS™) conditions, and then, the expressions of DAPI, NANOG, SOX2, and Merge markers were observed. The results are shown in
As can be seen from
After dispensing the same amount of induced pluripotent stem cells to the cell culture substrates according to Example 1 and Comparative Example 3, the cells were cultured in stem cell culture medium (StemMACS™) conditions. Then, the morphologies of passage 1 (P1) and passage 13 (P13) of the cultured cells were stained by a cell staining method, and the results of cell culture were shown in
As can be seen in
In addition, as can be seen from
In addition, as can be seen from
In addition, as can be seen from
The cell culture substrate was manufactured in the same manner as in Comparative Example 3, except that the fibrous web was changed to the fibrous web of Comparative Example 4.
The cell culture substrate was manufactured in the same manner as in Comparative Example 4, except that the fibrous web was changed to the fibrous web of Comparative Example 4.
The cell culture substrates according to Example 1, Example 2, Comparative Examples 3 to 6 were subjected to an accelerated aging test according to the guidelines for setting of shelf-life evaluation of medical device and stability evaluation in the following manner, and then induced pluripotent stem cells were cultured and the storage stability was evaluated.
Specifically, in order to reproduce the real-time aging of the cell culture substrate within a shortened time, the cell culture substrate was stored at an elevated temperature (60° C.) for 0 month, 1 month, 2 months, and 3 months, and the aging period of each cell culture substrate was set to be 0 year, 1 year, 2 years, and 3 years.
After dispensing the same amount of induced pluripotent stem cells in each of the three cell culture substrates prepared for each Example and Comparative Example, the stem cells were cultured for 5 days using a stem cell culture medium (StemMACS™). The results of cell culture were confirmed with the staining of a cell staining method, and photographed under an optical microscope. The resulting photographs of cell culture are shown in
As can be seen from
Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein. Those skilled in the art who understand the spirit of the present invention will be able to easily suggest other embodiments by including, changing, deleting, or adding components within the scope of the same spirit, but this is also said to be within the scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2019-0177073 | Dec 2019 | KR | national |
This application is a 35 U.S.C. 371 National Phase Entry application from PCT/KR2020/019215 filed Dec. 28, 2020, which claims priority to and the benefit of Korean Patent Application No. 10-2019-0177073, filed on Dec. 27, 2019, the disclosures of which are incorporated herein by reference in their entirety. The present application includes a Sequence Listing filed in electronic format. The Sequence Listing is entitled SOP115925US_ST25 created on Jun. 23, 2022 and is 13,000 bytes in size. The information in the electronic format of the Sequence Listing is part of the present application and is incorporated herein by reference in its entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2020/019215 | 12/28/2020 | WO |
