KR20130103889A - In vitro cultivation method of cardiac stem cell using culture vessel surface coated amine or carboxyl residue - Google Patents

Abstract

PURPOSE: A method for culturing cardiac stem cells in vivo is provided to enable effective long-term proliferation and culture of c-kit-positive cardiac stem cells in vivo by isolating the cardiac stem cells from a cardiac tissue, thereby producing a large amount of stem cell therapeutic agents and stem cells used for studying stem cells. CONSTITUTION: A method for culturing cardiac stem cells in vivo comprises the step of culturing cardiac stem cells on the surface coated with an amine residue or a carboxyl residue. The amine residue-coated surface is prepared by smearing amine polymers or amine residue-containing liquefied non-toxic compound on the surface and drying the surface. The carboxyl residue-coated surface is prepared by smearing carboxyl polymers or carboxyl residue-containing liquefied non-toxic compound on the surface and drying the surface. The cardiac stem cells are positive to c-kit.

Description

In vitro cultivation method of cardiac stem cell using culture vessel surface coated amine or carboxyl residue}

The present invention relates to a method for culturing cardiac stem cells in vitro using a surface coated with an amine group or carboxyl group.

Cardiac diseases, including myocardial infarction and heart failure, are caused by the loss and necrosis of cardiomyocytes that make up the heart, and is one of the major cardiovascular diseases leading to death. In particular, due to the recent radical changes in an aging society, the seriousness of medical economics is rapidly rising. Currently, as a treatment method for heart disease, medical treatment through drug treatment, angioplasty, surgical treatment through heart transplantation, etc. are mainly used, but there are limitations, and there is still insufficient method to effectively treat heart disease. It is true.

Recently, to overcome these limitations, research on cell therapy that enables the regeneration of the heart and myocardium using stem cells has been actively conducted. The stem cells refer to undifferentiated cells that can be differentiated into various kinds of cells constituting biological tissue. In the adult stem cells, including embryonic stem cells, various stem cells such as mesodermal stem cells, vascular endothelial progenitor cells, and dedifferentiated stem cells are capable of differentiating into various tissues including cardiomyocytes. Although it has been reported that it can be used for regeneration, the stem cells have a significantly lower rate of differentiation into cardiac tissue after transplantation and have a risk of various side effects such as arrhythmia, and thus are not practically used for cell therapy. Recently, however, resident cardiac stem cells exist in the heart of animals and humans among various stem cells, and the cardiac stem cells play an important role in regeneration of heart tissue after cardiomyocyte damage. It has been found that research on cell therapy using heart stem cells has attracted attention.

In order to use the cardiac stem cells for effective cell therapy, development of an easy in vitro culture method for securing the number of heart stem cells and for ease of research is required. Recently, various methods have been developed, such as the administration of cytokines to cultures, the attachment of electrostatically charged substances to surfaces, and the cultivation of cells in three dimensions. Cultivation is difficult due to limitations such as difficulty, inhibition of proliferation of cardiac stem cells, and loss of multipotential characteristics unique to stem cells in long-term culture.

As such, in order to effectively use cardiac stem cells for cell treatment, development of an easy and inexpensive in vitro culture method is required.

The present invention has been made to solve the above-mentioned problems in the prior art, the cardiac stem cells using the surface coated with an amine group or carboxyl group that can increase the proliferative capacity as well as maintain the multipotency of cardiac stem cells for a long time It is an object to provide an in vitro culture method. In addition, an object of the present invention is to provide a stem cell cell cultured using the in vitro culture method and a stem cell therapy for the treatment of heart and vascular diseases containing the same as an active ingredient.

However, the technical problem to be achieved by the present invention is not limited to the above-mentioned problem, another task that is not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention provides a method for culturing cardiac stem cells in vitro, wherein the method is for culturing cardiac stem cells on a surface coated with an amine residue or a carboxyl residue.

In one embodiment of the present invention, the surface coated with the amine group is characterized in that it is prepared by a method of drying an amine polymer or a liquefied cytotoxic compound comprising an amine group on the surface and then dried.

In another embodiment of the present invention, the surface coated with the carboxyl group is characterized in that it is prepared by a method of drying a carboxyl polymer (carboxyl polymer) or a liquefied cytotoxic compound comprising a carboxyl group on the surface and then dried.

In another embodiment of the present invention, the heart stem cells are characterized in that the c-kit positive.

In another embodiment of the present invention, the culture method is characterized in that to maintain the undifferentiated state of cardiac stem cells for 1 hour to 60 days.

The present invention also provides cardiac stem cells cultured on the surface coated with an amine group or carboxyl group.

In another aspect, the present invention provides a stem cell therapy for the treatment of heart or vascular diseases containing the heart stem cells as an active ingredient.

In vitro culturing method of cardiac stem cells according to the present invention by extracting c-kit positive cardiac stem cells excellent in cardiac tissue regeneration from cardiac tissue to enable long-term effective proliferation and culture in vitro for stem cell therapy and stem cell research Enables mass production of necessary stem cells In addition, when the C-kit positive cardiac stem cells are extracted from the tissues and cultured in vitro, high-quality stem cells can be cultured because they can suppress the stress response of stem cell proliferation. Therefore, it is expected that the cardiac stem cells necessary for cell therapy and research can be easily and inexpensively obtained in large quantities, thereby causing a positive effect in the field of developing cell therapeutics using stem cells. In addition, it is expected to be a source technology capable of mass production of various stem cells by culturing other stem cells than heart stem cells.

1 is a schematic diagram briefly showing an experimental method of the present invention.
2 is a view showing the results of measuring the adhesion of heart stem cells along the surface of the culture dish.
3 is a view showing the results of measuring the stem cell marker expression maintenance ability of the stem cells according to the surface of the culture dish.
4 is a view showing the results of measuring the proliferation of cardiac stem cells according to the surface of the culture dish.
5 is a view showing the results of measuring the protein expression and phosphorylation capacity of cardiac stem cells according to the surface of the culture dish.
6 is a view showing the results of quantifying the protein expression capacity and phosphorylation capacity of cardiac stem cells according to the surface of the culture dish.

The present inventors have studied the in vitro culture method that can easily maintain the pluripotency of cardiac stem cells for a long time in order to use the cardiac stem cells effectively for cell treatment, the present invention has been completed.

The present invention provides a method for culturing cardiac stem cells in vitro, wherein the method is for culturing cardiac stem cells on a surface coated with an amine residue or a carboxyl residue. .

The present inventors incubated c-kit positive cardiac stem cells expressing c-kit, a cardiac stem cell marker, by coating a surface of a culture vessel, which is generally readily available, with an amine group or a carboxyl group in a known manner. It was. The method of coating the surface promotes the activation of integrins involved in the proliferation and survival of the cells on the surface, thereby improving the proliferation of the cells and enhancing the adhesion of the cells to reduce the stress in the environment in which the cells can grow. There is no limitation as long as it is possible to have a large number of amine groups or carboxyl groups. Preferably, the method of coating the amine group is an amine polymer, a liquefied cell nontoxic compound including the amine group, or an allylamine, hexyl amine, heptylamine, which has volatile characteristics. Organic molecules and the like having an amine functional group such as and the like may be added on the surface, dried using a micro or nano spray or plasma. However, it is not limited thereto. Preferably, the method for coating the carboxyl group may be carried out by adding a carboxyl polymer, a liquefied cell nontoxic compound containing a carboxyl group, an organic molecule having a carboxyl functional group having a volatile characteristic, or the like. Or dry using a nano spray or plasma. However, it is not limited thereto. In addition, the material of the surface is not limited so long as it is a kind capable of culturing cells. For example, glass, polyethylene, polypropylene, or the like can be used.

In one embodiment of the present invention, cardiac stem cells cultured in a culture plate coated with an amine group or a carboxyl group by the above method are promoted phosphorylation of focal adhesion kinase (FAK) to increase cell adhesion, and c-, a stress-related protein. While phosphorylation of Jun N-terminal kinases (JNK) is inhibited, phosphorylation of c-Src and extracellular signal-regulated kinase (Erk) is increased, resulting in the expression of Cyclin-dependent kinase 2 (CDK2), a cell cycle regulatory protein. Not only did the cell proliferation increase, but the expression of the stem cell marker c-kit was maintained at a high rate even after long-term culture (see Example 2).

From the above results, since the cardiac stem cells cultured using the in vitro culture method of the present invention maintain the multipotential characteristics of stem cells for a long time (1 hour to 60 days), the heart stem cells for the treatment of heart disease It is expected to be applicable to cell therapies for cardiac tissue regeneration. Accordingly, the present invention provides a cardiac stem cell cultured using the in vitro culture method of the present invention, and a cell therapeutic agent for cardiac tissue regeneration and / or cardiac disease treatment containing the in vitro cultured heart stem cells as an active ingredient. There is no restriction on the period of culturing the in vitro cultured heart stem cells, but preferably may be cultured for 1 hour to 60 days to maintain the multipotency. In the case of culturing cells using cell adhesion ability, the cells may be cultured for a long time for 1 hour or more, and for cells for procedures and studies for 15 days or more. However, it is not limited thereto.

In order to use the cardiac stem cells of the present invention as a cell therapy, it can be prepared in a pharmaceutical composition containing the cardiac stem cells as an active ingredient. The pharmaceutical composition may comprise a pharmaceutically acceptable carrier. The pharmaceutically acceptable carrier may include physiological saline, polyethylene glycol, ethanol, vegetable oil, isopropyl myristate, and the like, but is not limited thereto.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited by the following examples.

[ Example ]

Example  C- kit  In vitro culture of benign heart stem cells

6-well culture dish coated with amine residue or carboxyl residue was used to dispense c-kit positive cardiac stem cells to 10,000 cells / well, followed by 2 mL cardiac stem cell culture (Ham F12 nutrient medium, 10% fetal bovine serum, 0.1% penicillin / streptomycin, basic fibroblast growth factor, erythropoietin, L-glutathione ) Was added. After culturing at 5% CO ₂ , 37 ° C. for 24 hours, the culture medium was removed to remove cells that did not adhere to the surface, and then replaced with new 2 mL of cardiac stem cell culture. And every two days, the cells were cultured while replacing with new cardiac stem cell culture. As a control, c-kit positive cardiac stem cells were cultured in the same manner as above in a 6 well culture dish without coating.

Example  2. Characterization of Heart Stem Cells

2-1. Cell Attachment  Measure

In order to determine the effect of the in vitro culture method using an amine group or carboxyl group coated plate on the adhesion ability of the cardiac stem cells, the culture method after culturing the c-kit positive cardiac stem cells in the same manner as in Example 1 for 18 hours The number of cells attached to the surface of the dish was counted to measure the cell's adhesion ability. The results are shown in Fig.

As shown in Figure 2, it was confirmed that the adhesion capacity of the cardiac stem cells in the culture plate coated with the amine group or carboxyl group compared to the non-coated culture plate about 2 times. Through the above results, it was confirmed that the amine group or carboxyl group on the surface of the culture plate improves the cell adhesion.

2-2. Stem Cell Marker Expression in Cells Retention  Confirm

In order to confirm the effect of the in vitro culture method using an amine group or a carboxyl group coated plate to maintain the stem cell marker (c-kit) expression of cardiac stem cells, c-kit positive heart in the same manner as in Example 1 After culturing the stem cells for 14 days, c-kit markers were measured by a fluorescence activated cell sorter (FACS). The measurement method is divided into fluorescence and non-fluorescence samples for analysis of c-kit markers, and the primary range is set by checking the shape of cells with a sample without fluorescence on FACS, and fluorescence is labeled. By using the prepared sample, the range of cells in which fluorescence is expressed was set to secondary, and the separation and extraction of cells having similar shapes and strong fluorescence expression were performed. The results are shown in Fig.

As shown in FIG. 3, it was confirmed that the expression of stem cell markers was maintained about 2 times higher than that of the control group after 14 days in the case of cells cultured in an amine group or carboxyl group coated plate. Through the above results, it was confirmed that when culturing cardiac stem cells using a culture plate coated with an amine group or a carboxyl group, stem cell characteristics can be maintained for a long time.

2-3. Cell Proliferative ability  Measure

In order to determine the effect of the in vitro culture method using the culture plate coated with an amine group or carboxyl group on the proliferative capacity of cardiac stem cells, the c-kit positive cardiac stem cells were cultured for 8 days in the same manner as in Example 1 and trypan The proliferation capacity of the cells was measured by counting the number of viable cells not stained with trypan blue. The results are shown in Fig.

As shown in Figure 4, when using a culture plate coated with a carboxyl group, cell proliferation was similar to the case of culture using a non-coated culture dish. However, in the case of using a culture plate coated with an amine group, it was confirmed that the proliferation capacity of the cells was increased by about two times. Through the above results, it was confirmed that when the culture plate coated with the amine group can improve the proliferation capacity of c-kit positive cardiac stem cells.

2-4. Cell proteins Expression ability  And Phosphorylation capacity  Measure

In vitro culture methods using amine- or carboxyl-coated culture plates are focal adhesion kinase (FAK), cytoplasmic sarcoma (c-Src), cyclin dependent kinase (CK2), and extracellular signal (ERK) of cardiac stem cells. In order to confirm the effect on the expression or phosphorylation of -regulated kinases) and JNK (c-Jun N-terminal Kinases), the same procedure as in Example 1 was followed by culturing c-kit positive cardiac stem cells for 14 days. Expression or phosphorylation of the protein was confirmed by western blotting. The results are shown in FIGS. 5 and 6.

As shown in FIG. 5 and FIG. 6, in the case of cells cultured in a culture plate coated with an amine group or a carboxyl group, it was confirmed that phosphorylation of FAK, c-Src, and Erk was increased. It was also confirmed that the expression of CDK2 was significantly increased. On the contrary, it was confirmed that the phosphorylation of JNK protein was inhibited in the case of cells cultured in an amine-coated culture dish.

Through the above results, it was confirmed that the use of a culture plate coated with an amine group or a carboxyl group increased the phosphorylation of FAK to increase cell adhesion. Increasing the phosphorylation of the Erk finally increased the expression of the cell cycle regulatory protein CDK2 was confirmed to improve the cell proliferation ability.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be.

Claims (7)

In vitro culturing method of cardiac stem cells, characterized in that culturing cardiac stem cells on a surface coated with an amine group (carboxyl residue) or carboxyl residue (carboxyl residue), in vitro culture method of heart stem cells. The method of claim 1,
The surface coated with the amine group is prepared by a method of drying an amine polymer or a liquefied cytotoxic compound comprising an amine group on the surface and then drying. The method of claim 1,
The surface coated with the carboxyl group is prepared by a method of drying a carboxyl polymer or a liquefied cytotoxic compound comprising a carboxyl group on the surface and then drying. The method of claim 1,
The cardiac stem cells are c-kit positive. The method of claim 1,
The culture method is characterized in that to maintain the undifferentiated state of heart stem cells for 1 hour to 60 days. Cardiac stem cells cultured on the surface coated with an amine group or carboxyl group. A stem cell therapy for the treatment of heart or vascular diseases, comprising the stem cell of claim 6 as an active ingredient.

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