This application claims the benefit of Korean Patent Application No. 10-2019-0083683, filed Jul. 11, 2019, contents of which are incorporated herein by reference.
The present invention is drawn to a method of improving properties of stem cells, more particularly to a method of improving the migration ability of stem cells into cancer cells.
Currently, methods for treating cancer include treatment through surgical operation, radiotherapy, and chemotherapy, but this is accompanied by side effects, or the procedure is limitedly applied depending on the degree of cancer progression. In particular, anticancer drugs used the chemotherapy increased quantitatively as a result of accumulated research, but have not changed significantly in terms of quality. The reason is that most of the anticancer drugs work as a mechanism to stop and kill the cell cycle of actively dividing cells, thereby attacking cells that divide normally besides cancer cells, leading to the side effects of anticancer drugs such as hair loss, loss of appetite, and decrease in immunity due to the reduction of white blood cells. In order to minimize the side effects of these anticancer drugs, the development of targeted anti-cancer drugs is actively taking place, to date, more than 18 targeted anti-cancer drugs have been developed and approved through clinical trials, and more than 200 types of targeted anti-cancer drugs are under clinical trial. However, these targeted anti-cancer drugs have limitations in that they are effective in patients with specific targets, even if they are the same type of cancer, and targeted anti-cancer drugs have problems that cause resistance because they must be administered over a long period of time. Thus, cocktail therapy that uses the targeted anti-cancer drugs in combination with strong anti-cancer drugs and the use of a single anticancer drug to remove cancer in a short time by attacking multiple targets at the same time are considered as alternatives, which also poses a risk of causing serious side effects. Therefore, research on anticancer agents using gold nanoparticles, biodegradable polymers, and carbon nanotubes as targeted anti-cancer agents that can effectively treat cancer with little side effects is actively underway.
In the case of previous nano anti-cancer drugs that have been developed for more effective chemotherapy, biodegradable polymers used in formulations have been easily dissociated from nano-materials under acidic pH and blood conditions, thus limiting the delivery of anti-cancer drugs to target sites and anti-cancer effect of non-degradable nanoparticles such as silica, magnetic nanoparticles and carbon-based nanoparticles at non-toxic doses has not been verified and they have the disadvantages of accumulating in the reticulum endothelial system (RES) organs. These nano-scale anti-cancer drugs still have technical problems to be solved.
As an alternative to this, studies have been attempted to use stem cells having targeting ability against cancer cells as drug delivery vehicles for these nano-scale anti-cancer agents (Zhang et al., Oncotarget, 8(43): 75756-75766, 2017; Auffinger et al., Oncotarget, 4(3): 378-396, 2013; Mooney et al., ACS Nano 8(12): 12450-12460, 2014).
However, the above-mentioned prior arts have cost-related problems since the cancer targeting ability of the stem cells is not so high, a large number of stem cells must be used as a drug delivery system.
The present invention is to solve a number of problems, including the problems as described above, an object of the present invention is to provide a method of enhancing the migration ability or targeting ability of stem cells toward cancer cells. However, these problems are exemplary, and the scope of the present invention is not limited thereto.
In an aspect of the present invention, there is provided a method of improving the migration ability of stem cells into cancer cells comprising: educating the stem cells by treating the stem cells with a cell culture medium of in vitro cell culture of cancer cells obtained from a cancer patient to be treated and optionally an anion channel activator.
In another aspect of the present invention, there is provided a composition for improving the migration ability of stem cells into cancer cells comprising an anion channel activator and a cell culture medium of in vitro cell culture of cancer cells obtained from a cancer patient to be treated as an active ingredient.
In another aspect of the present invention, there is provide a drug delivery composition for delivering anti-cancer drugs selectively to cancer cells comprising stem cells educated by treating the stem cells with an anion channel activator and a cell culture medium of in vitro cell culture of cancer cells obtained from a cancer patient to be treated, wherein the stem cells have improved migration ability into the cancer cells of the cancer patient.
In another aspect of the present invention, there is provided a stem cell-nano anti-cancer drug complex in which a carbon nanotube (CNT) or gold nanoparticle (AuNP) loaded with an anti-cancer drug is coupled to the surface of a stem cell, wherein the stem cell is educated in order to improve its migration ability into cancer cells by treating the stem cell with an anion channel activator and a cell culture medium of in vitro cell culture of cancer cells obtained from a cancer patient to be treated.
In another aspect of the present invention, there is provided a pharmaceutical composition for treating cancer comprising the stem cell-nano anti-cancer drug complex as an active ingredient.
In another aspect of the present invention, there is provided a method of treating cancer in a subject in need of treatment comprising administering a stem cell-nano anti-cancer drug complex in which a carbon nanotube (CNT) or gold nanoparticle (AuNP) loaded with an anti-cancer drug is coupled to the surface of a stem cell, wherein the stem cell is educated in order to improve its migration ability into cancer cells by treating the stem cell with an anion channel activator and a cell culture medium of in vitro cell culture of cancer cells obtained from the subject.
In another aspect of the present invention, there is provided a method of treating cancer in a subject in need of treatment comprising:
preparing an educated stem cell by educating a stem cell, wherein the educating is performed by treating the stem cell with cell culture medium of in vitro cell culture of cancer cells obtained from the subject and optionally an anion channel activator to the stem cell;
preparing an educated stem cell-nano anti-cancer drug complex by attaching a nanoparticle loaded with an anti-cancer drug to the educated stem cell; and
administering therapeutically effective amount of the educated stem cell-nano anti-cancer drug complex to the subject
According to one embodiment of the present invention made as described above, since the migration ability of stem cells into targeted cancer cells and the targeting ability is greatly enhanced, even if a smaller amount of stem cells is used, the anticancer treatment effect can be maximized. However, the scope of the present invention is not limited by these effects.
The term “mesenchymal stem cell (MSC)” as used herein means adult mesenchymal stem cell (MSC) among adult stem cells and is derived from bone marrow, umbilical cord blood, and adipocytes. It is characterized by having multipotency.
The term “nano anti-cancer drug complex” as used herein means a drug delivery system for anti-cancer agents using nanotechnology which is used for controlling release and absorption of anticancer drugs, or targeting and delivering anticancer drugs to specific sites of the body, and maximizing efficacy of anti-cancer drugs while reducing side effects thereof as well as retention of anti-cancer drugs for a certain period of time in the targeted site.
The term “immune checkpoint inhibitor” as used herein refers to a drug that blocks certain types of immune system cells, such as T lymphocytes, and certain proteins produced by some cancer cells. These proteins inhibit immune responses and prevent T lymphocytes from killing cancer cells. Therefore, when these proteins are blocked, the immune system's “braking system” is released and T lymphocytes can kill cancer cells better. PD-1/PD-L1 and CTLA-4/B7-1/B7-2 are well known so far as the “immune checkpoint”. Examples of PD-1 inhibitors include Pembrolizumab (trade name: Keytruda), Nivolumab (trade name: Opdivo), and the PD-1 ligand, PD-L1 inhibitor, Atezolizumab (trade name: Tecentriq), and Avelumab (trade name: Bavencio) Etc. are present. Meanwhile, as a CTLA-4 inhibitor that inhibits the interaction of CTLA-4/B7-1/B7-2, Ipilimumab (trade name: Yervoy) has been approved by the USFDA. In recent years, it has been impressively successful, especially in patients with metastatic melanoma or Hodgkin's lymphoma, and has shown great potential in clinical trials in other types of cancer patients.
The term “antibody” as used herein also referred as an immunoglobulin, refers to a Y-shaped protein produced from plasma cells which is used by the immune system to identify or neutralize foreign substances such as bacteria and viruses. The antibodies used herein include various “functional fragments” derived from antibodies, such as Fab, F(ab′)2, Fab′, scFv and sdAb.
The term “functional fragment of an antibody” as used herein means a fragment derived from the antibody, which retains antigen-binding activity, and includes both a fragment produced by cutting the antibody with an endopeptidase as well as a single-chain fragment produced by a recombinant method.
The term “Fab” as used in this document is an antigen-binding antibody fragment (fragment antigen-binding), a fragment produced by cutting an antibody molecule with a protease, papain, a dimer of two peptides, VH—CH1 and VL—CL, and another fragment produced by papain is referred to as Fc (fragment crystallizable).
The term “F(ab′)2” as used in this document is a fragment containing an antigen-binding site among fragments produced by cleaving an antibody with a protease, pepsin, and refers to a tetrameric form in which the two Fabs are connected by disulfide bonds. Another fragment produced by pepsin is referred to as pFc′.
The term “Fab′” as used herein refers a molecule having a structure similar to Fab produced by separating the F(ab′)2 under weak reducing conditions.
The term “scFv” as used herein is an abbreviation of “single chain variable fragment” and is not a fragment of an actual antibody. It is produced by linking heavy chain variable region (VH) and light chain variable region (VL) with a linker peptide of about 25 a.a. It is known to possess antigen binding ability even though it is not a unique antibody fragment (Glockshuber et al., Biochem. 29(6): 1362-1367, 1990).
The term “sdAb (single domain antibody)” as used in this document is referred to as a nanobody, and is an antibody fragment composed of a single variable region fragment of an antibody. The sdAb derived from the heavy chain is mainly used, but a single variable region fragment derived from the light chain is also reported to be a specific binding to the antigen.
The term “antibody mimetic” as used herein refers to a single chain antibody fragment derived from camelids or cartilaginous (VHH or VNAR) which consists of only a heavy chain except a light chain or an antibody-like protein prepared from non-antibody scaffold protein such as Alphabody, Avimer, Affilin, nanoCLAMPs, Adnectin, Affibody, Anticalin, DARPin, Fynomer, Kunitz domain, monobody, and variable lymphocyte receptors (VLRs).
In an aspect of the present invention, there is provided a method of improving the migration ability of stem cells into cancer cells comprising: educating the stem cells by treating the stem cells with a cell culture medium of in vitro cell culture of cancer cells obtained from a cancer patient to be treated and optionally an anion channel activator.
In the above method, the stem cells may be embryonic stem cells or mesenchymal stem cells, and the mesenchymal stem cells can be bone marrow-derived mesenchymal stem cells, adipose-derived mesenchymal stem cells, umbilical cord-derived mesenchymal stem cells, dental pulp-derived stem cells or peripheral blood-derived stem cells.
In the above method, the anion channel activator may be a Cl− channel activator or a bicarbonate channel activator, and the anion channel activator may be forskolin, denufosol, brevenal, lubiprostone, N-aroylaminothiazole “activators” (Eact) analogue. These anionic channel activators are well documented in Namkung et al. (FASEB J. 25(11): 4048-4062, 2011). The above document is incorporated herein by reference.
In another aspect of the present invention, there is provided a composition for improving the migration ability of stem cells into cancer cells comprising an anion channel activator and a cell culture medium of in vitro cell culture of cancer cells obtained from a cancer patient to be treated as an active ingredient.
In the composition, the stem cells may be embryonic stem cells or mesenchymal stem cells, and the mesenchymal stem cells are bone marrow-derived mesenchymal stem cells, adipose-derived mesenchymal stem cells, umbilical cord-derived mesenchymal stem cells, dental pulp-derived stem cells or peripheral blood-derived stem cells.
In the composition, the anion channel activator may be a Cl− channel activator or a bicarbonate channel activator, and the anion channel activator may be forskolin, denufosol, brevenal, lubiprostone, N-aroylaminothiazole “activators” (Eact) analogue.
In another aspect of the present invention, there is provide a drug delivery composition for delivering anti-cancer drugs selectively to cancer cells comprising stem cells educated by treating the stem cells with an anion channel activator and a cell culture medium of in vitro cell culture of cancer cells obtained from a cancer patient to be treated, wherein the stem cells have improved migration ability into the cancer cells of the cancer patient.
In another aspect of the present invention, there is provided a stem cell-nano anti-cancer drug complex in which a carbon nanotube (CNT) or gold nanoparticle (AuNP) loaded with an anti-cancer drug is coupled to the surface of a stem cell, wherein the stem cell is educated in order to improve its migration ability into cancer cells by treating the stem cell with an anion channel activator and a cell culture medium of in vitro cell culture of cancer cells obtained from a cancer patient to be treated.
In the stem cell-nano anti-cancer drug complex, the anticancer drug may be a chemical agent or a biologic agent, and the chemical agent may be doxorubicin, paclitaxel, ABT737, 5-fluorouracil, BCNU, CCNU, 6-mercaptopurine, nitrogen Mustard, cyclophosphamide, vincristine, vinblastine, cisplatin, mesotrexate, cytarabine thiotepa, busulfan or procarbazine. In addition, the biologic agent may be an immune checkpoint inhibitor, immune activating protein or an antibody or a functional fragment thereof targeting a cancer marker protein. In the stem cell-nano anti-cancer drug complex, the immune checkpoint may be PD-1, PD-L1, CTLA-4, B7-1 or B7-2, and the immune checkpoint inhibitor may an inhibitor of PD-1/PD-L1 interaction or an inhibitor of CTLA-4/B7-1/B7-2 interaction. The inhibitor of PD-1/PDL1 interaction may be an antibody targeting PD-1 or PD-L1, a functional fragment of the antibody, or a single chain-based antibody mimetic, and the inhibitor of CTLA-4/B7-1/B7-2 interaction may be an antibody targeting the CTLA-4, B7-1 or B7-2, a functional fragment of the antibody, or a single chain-based antibody mimetic, and the antibody targeting the PD-1 or PD-L1 may be Pembrolizumab, Nivolumab, Atezolizumab or Avelumab, and the inhibitor of CTLA-4/B7-1/B7-2 interaction may be ipilimumab. The immune-activating protein may be C-reactive protein, serum amyloid P component, serum amyloid A, mannan-binding lectin, fibrinogen, prothrombin, factor VIII, von Willebrand factor, plasminogen activator inhibitor-1 (PAI-1), alpha 2-macroglobulin, hepcidin, ceruloplasmin, haptoglobin, orosomucoid (alpha-1-acid glycoprotein, AGP), alpha 1-antitrypsin, or alpha 1-antichymotrypsin. The cancer marker protein, an overexpressed protein on the surface of cancer cells, may be AFP (alphafetoprotein), epidermal growth factor receptor (EGFR), carcinoembryonic antigen (CEA), CA-123, MUC-1, epithelial tumor antigen (ETA), tyrosinase, or MAGE (melanoma-associated antigen).
In the stem cell-nano anti-cancer drug complex, the nanoparticle may be an organic nanoparticle or an inorganic nanoparticle, and the organic nanoparticle may be a porous or shell/core structure composed of a biodegradable polymer. The biodegradable polymer may be PLGA{poly(lactic-co-glycolic acid)}, PVA{poly(vinyl alcohol)}, PGA{poly(glycolic acid)}, PLA{poly(lactic acid)}, PCL{poly(caprolactone)}, PHA{poly(hydroxyalkanoate)}, aliphatic polyester, or mixtures thereof. In addition, the inorganic nanoparticles may be gold nanoparticles or carbon nanotube-based nanoparticles.
In the stem cell-nano anti-cancer drug complex, the nanoparticle may be attached to the stem cell by attaching an antibody specific to the stem cell marker protein, wherein the antibody is attached on the surface of the nanoparticle and the stem cell marker protein may be CD90, CD73 or CD105.
In the stem cell-nano anti-cancer drug complex, the nanoparticles may be coated with a polymer material having a carboxyl group, and the polymer material having a carboxyl group is carboxylated PEG (polyethylene glycol), hyaluronic acid (PHA), polyhydroxyalkanoates (PHA), PLGA{poly(lactic-co-glycolic acid)}, PLA{poly(lactic acid)} or PGA{poly(glycolic acid)}.
Alternatively, when the anti-cancer drug is a biologic agent, the stem cells may be transformed to directly express the biologic agent. In this case, a gene construct comprising a polynucleotide encoding the biologic agent operably linked to a transcription regulator suitable for gene expression of a stem cell, such as a promoter and an enhancer may be prepared and then transduced with the stem cells in various ways for preparing transduced stem cells.
In another aspect of the another aspect of the present invention, there is provided a pharmaceutical composition for treating cancer comprising the stem cell-nano anti-cancer drug complex as an active ingredient.
The pharmaceutical composition for treating cancer of the present invention may include a pharmaceutically acceptable carrier. The composition comprising a pharmaceutically acceptable carrier may be various oral or parenteral formulations, but is preferably a parenteral formulation. In the case of formulation, it is prepared using diluents or excipients such as fillers, extenders, binders, wetting agents, disintegrating agents and surfactants. Solid preparations for oral administration include tablets, pills, powders, granules, and capsules, etc. These solid preparations are prepared by mixing at least one excipient such as starch, calcium carbonate, sucrose or lactose, gelatin, etc. with the active ingredient. In addition, lubricants such as magnesium stearate and talc may be used in addition to simple excipients. Liquid preparations for oral administration include suspending agents, oral liquid solutions, emulsions, syrups, etc. In addition to water and liquid paraffin, which are commonly used as diluents, various excipients such as wetting agents, sweeteners, fragrances, and preservatives can be included. Formulations for parenteral administration include sterile aqueous solutions, non-aqueous solvents, suspensions, emulsions, lyophilized preparations, and suppositories. As the non-aqueous solvent and suspension solvent, propylene glycol, polyethylene glycol, vegetable oil such as olive oil, and injectable ester such as ethyl oleate may be used. As a base for suppositories, witepsol, macrogol, tween 61, cacao butter, laurin butter, and glycerogelatin may be used.
The pharmaceutical composition for treating cancer of the present invention may be any selected preparations from the group consisting of tablets, pills, powders, granules, capsules, suspensions, solutions, emulsions, syrups, sterilized aqueous solutions, non-aqueous solvents, suspensions, emulsions, lyophilizers and suppositories.
The pharmaceutical composition for treating cancer of the present invention may be administered orally or parenterally, and when administered parenterally, it can be administered through various routes such as intravenous injection, intranasal inhalation, intramuscular administration, intraperitoneal administration, and percutaneous absorption.
The pharmaceutical composition for treating cancer of the present invention may be administered in a therapeutically effective amount.
The term “therapeutically effective amount” as used herein refers to an amount sufficient to treat the disease at a reasonable benefit/risk ratio applicable to medical treatment, and the effective dose level may be determined according to factors including the type of subject, severity of disease, age, sex, and activity of anticancer agents, sensitivity to anticancer agents, time of administration, route of administration and rate of excretion, duration of treatment, concurrent anticancer agents, and other factors well known in the art. The pharmaceutical composition of the present invention may be administered at a dose of 0.1 mg/kg to 1 g/kg, more preferably 1 mg/kg to 500 mg/kg. Meanwhile, the dosage may be appropriately adjusted according to the patient's age, gender and condition.
The pharmaceutical composition for treating cancer according to the present invention may be administered as an individual therapeutic agent or in combination with other anti-cancer agents, and may be administered sequentially or simultaneously with other conventional anti-cancer agents. And it can be administered as single or multiple administration. Considering all of the above factors, it is important to administer an amount that can achieve the maximum effect in a minimal amount without side effects, and can be easily determined by those skilled in the art.
In another aspect of the present invention, there is provided a method of treating cancer in a subject in need of treatment comprising administering a stem cell-nano anti-cancer drug complex in which a carbon nanotube (CNT) or gold nanoparticle (AuNP) loaded with an anti-cancer drug is coupled to the surface of a stem cell, wherein the stem cell is educated in order to improve its migration ability into cancer cells by treating the stem cell with an anion channel activator and a cell culture medium of in vitro cell culture of cancer cells obtained from the subject.
In another aspect of the present invention, there is provided a method of treating cancer in a subject in need of treatment comprising:
preparing an educated stem cell by educating a stem cell, wherein the educating is performed by treating the stem cell with cell culture medium of in vitro cell culture of cancer cells obtained from the subject and optionally an anion channel activator to the stem cell;
preparing an educated stem cell-nano anti-cancer drug complex by attaching a nanoparticle loaded with an anti-cancer drug to the educated stem cell; and
administering therapeutically effective amount of the educated stem cell-nano anti-cancer drug complex to the subject.
The present inventors focus on the ability of stem cells with targeting ability to cancer cells and prepared stem cell-anti-cancer loaded nanoparticle complexes in which nanoparticles, such as gold nanoparticles, which are loaded with anticancer compounds are attached on the surface of stem cells and confirmed safety and therapeutic effect thereof. However, since the cancer targeting ability of stem cells is not complete, the stem cell anti-cancer drug complex has a problem that requires a large amount of stem cells. This is a big obstacle in the development of anti-cancer therapeutics using stem cells, because it takes a great cost to cultivate and proliferate stem cells. Accordingly, there is a need to enhance the targeting ability of stem cells to cancer cells so that the maximum effect can be achieved even in a smaller amount.
Thus, the present inventors tried to maximize the targeting ability of stem cells to cancer cells. As a result, the present inventors confirmed that when activating the anion channels of the stem cells, the ability of the stem cells to migrate into the target cancer cells is enhanced when the stem cells are educated by treating cell culture medium of cancer cells isolated from a cancer patient to be treated for a certain period of time, and when the stem cells are educated by treating both the components (anion channel activator and cell culture medium of the target cancer cells), the migration potency of the stem cells into target cancer cells can be elevated significantly (
Hereinafter, the invention will be described in detail through examples. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and the following embodiments make the disclosure of the present invention complete, and inform the scope of the invention to those skilled in the art completely.
In vitro mobility measurement of stem cells according to an embodiment of the present invention was performed using a transwell membrane bilayer plate having a pore size of 8 μm. Cancer cells for stimulating the stem cells were cultured in the layer under the membrane, and the stem cells were cultured in the upper chamber to allow the cells to penetrate downward. At this time, the mobility was measured through the number of stem cells infiltrated the membrane.
1-1: Search for Stem Cell Tracking Ability According to Chemokine Derived from Cancer Cells
The present inventors sought to investigate whether the ability of stem cells to migrate into cancer cells is due to a response to chemokine secreted by cancer cells. To this end, the present inventors investigated the influence of chemokines by inhibiting chemokine receptors of stem cells that respond to chemokines secreted from cancer cells with antibodies (
As a result, as shown in
In order to investigate the effect of ion channel activity on the ability of stem cells to migrate into cancer cells, the present inventors performed an analysis similar to Example 1-1 using DIDS (4,4′-Diisothiocyano-2,2′-stilbenedisulfonic acid) which is an ion channel inhibitor and antibodies specifically binding to ion channels (SLC4A4, SLC4A7). Particularly, in the case of lung cancer cells, 5×104 of bone marrow-derived mesenchymal stem cells (BMMSCs) as a control group and lung cancer cells (A549 and H1975) as an experimental group were dispensed onto the lower well, respectively, and cultured at 37° C. for 24 hours. Thereafter, 5×104 of BMMSCs treated with 500 μM of DIDS or antibodies specifically binding to the ion channel were dispensed onto the transwell, and then cultured at 37° C. for 6 hours. In the case of pancreatic cancer cells, each 5×104 cells of ADMSCs as a control group and pancreatic cancer cells (PANC-1) as an experimental group were dispensed onto the lower well and incubated at 37° C. for 48 hours. Thereafter, 5×104 cells of ADMSCs treated with DIDS or antibodies specifically binding to ion channels were seeded on the transwells, and the transwells were inserted into the lower wells, and further cultured for 3 hours. In the case of brain tumor cells, each 5×104 cells of ADMSCs as a control group and brain tumor cells (U87MG) as an experimental group were dispensed onto the lower well and incubated at 37° C. for 48 hours. Thereafter, 5×104 ADMSCs treated with DIDS or antibodies specifically binding to ion channels were seeded on the transwells, and the transwells were inserted into the lower wells, and further cultured for 3 hours. After the cultivation, the cells of the lower layer wells were fixed with methanol, and the nuclei of stem cells migrated into the lower well were stained with DAPI (4′,6-diamidino-2-phenylindole). Subsequently, stem cells migrated into the lower well through the transwell membrane were counted trough a confocal fluorescence microscope in order to measure their mobility (
As a result, as shown in
The microenvironment of cancer cells is acidic, unlike normal tissue. Accordingly, the present inventors tried to investigate the effect of the microenvironment, that is, the acidic condition of cancer, on the migration of stem cells into the cancer cells. To this end, specifically, 5×104 of bone marrow-derived mesenchymal stem cells (BMMSCs) as a control group and lung cancer cells (A549) as an experimental group, respectively, were dispensed onto the lower well, and the culture medium adjusted to pH 6.5 without cancer cells was dispensed onto the experimental group, and then the cells were cultivated for 24 hours at 37° C. Then, 5×104 BMMSCs were dispensed onto the transwells, and the trasnwells were inserted into the lower wells, and cultured for 6 hours. In the case of pancreatic cancer cells, 5×104 of adipose-derived mesenchymal stem cells (ADMSCs) as a control group and pancreatic cancer cells (PANC-1) as an experimental group were dispensed onto the lower wells, respectively, and the culture medium adjusted to pH 6.5 without cancer cells was dispense into the experimental group and the cells were further incubated at 37° C. for 24 hours. And then, 5×104 cells of ADMSCs were seeded into the transwells, and the transwells were inserted into the lower wells, and cultured for 3 hours. In the case of brain cancer cells, 5×104 of adipose-derived mesenchymal stem cells (ADMSCs) as a control group and brain cancer cells (U87MG) as an experimental group were dispensed onto the lower wells, respectively, and the culture medium adjusted to pH 6.5 without cancer cells was dispense into the experimental group and the cells were further incubated at 37° C. for 24 hours. After culturing, the cells of the lower layer wells were fixed with methanol, and the nuclei of stem cells stained with DAPI (4′,6-diamidino-2-phenylindole). Subsequently, stem cells migrated into the lower chamber were counted through a confocal fluorescence microscope in order to measure their mobility (
As a result, as shown in
The present inventors investigated whether the ability of stem cells to migrate into cancer cells can be enhanced when educating stem cells from the results of the above-described Examples 1-1 to 1-3. Particularly, in the case of lung cancer cells, the present inventors dispense 5×104 each of bone marrow-derived mesenchymal stem cells (BMMSCs) as a control and lung cancer cells (A549 and H1975) as experimental groups were dispensed onto the lower well, and cultivated for 24 hours at 37° C. Simultaneously with the cultivation of the lower well, the BMMSCs were inoculated into a cell-free medium in which lung cancer cells had been cultured at 37° C. for 24 hours, and then cultured at 37° C. for 24 hours, followed by dispensing 5×104 cells onto the transwells. The transwells were inserted into the lower wells and further cultured for 6 hours (education). In the case of pancreatic cancer cells, 5×104 cells of adipose-derived mesenchymal stem cells (ADMSCs) as a control group and pancreatic cancer cells (PANC-1) as a control group were dispensed onto the lower wells and cultured at 37° C. for 48 hours. Simultaneously with the culture of the lower well, like the lung cancer cells, ADMSCs were inoculated with cell-free medium in which pancreatic cancer cells had been cultured at 37° C. for 24 hours, and further cultured at 37° C. for 24 hours, followed by dispensing 5×104 cells in the transwells. The transwells were inserted to the lower wells and the cells were further cultivated for 3 hours (education). In the case of brain cancer cells, 5×104 cells of adipose-derived mesenchymal stem cells (ADMSCs) as a control group and brain cancer cells (U87MG) as a control group were dispensed onto the lower wells and cultured at 37° C. for 48 hours. Simultaneously with the culture of the lower well, like the lung cancer cells and the pancreatic cancer cells, ADMSCs were inoculated with cell-free medium in which pancreatic cancer cells had been cultured at 37° C. for 48 hours, and further cultured at 37° C. for 24 hours, followed by dispensing 5×104 cells onto the transwells. The transwells were inserted to the lower wells and the cells were further cultured for 3 hours (education). On the other hand, in Example 1-3, from the result that the ability of stem cells to migrate into cancer cells was decrease when anion channel inhibitor was treated, the present inventors sought to investigate whether the ability of stem cells to migrate into cancer cells is enhanced when anion channel is activated. To this end, the present inventors treated 100 nM forskolin which is an anion channel activator anole (+ forskolin) or in combination with the cell-free culture medium in which cancer cells had been cultivated (education2 or e2) to the stem cells in all experiments.
After the cultivation, the cells of the lower wells were fixed with methanol, and the nuclei of stem cells stained with DAPI (4′,6-diamidino-2-phenylindole). Subsequently, stem cells migrated into the lower wells were counted through a confocal fluorescence microscope in order to measure their mobility (
From the above results, the present inventors conducted the above except that the target cancer cells were changed in order to investigate whether the education of stem cells using culture medium of cancer cells specifically acts on the corresponding cancer cells or the same effect on other cancer cells. The similar experiment as in Example 1-4 was performed. Particularly, in the case of lung cancer cells, the present inventors dispense 5×104 of bone marrow-derived mesenchymal stem cells (BMMSCs) as a control and lung cancer cells (A549 and H1975) as experimental groups were dispensed onto the lower well, respectively, and cultivated for 24 hours at 37° C. Simultaneously with the cultivation of the lower well, the BMMSCs were inoculated into a cell-free medium in which lung cancer cells (A549) had been cultured at 37° C. for 24 hours or cell-free medium in which pancreatic cancer cells (PANC-1) had been culture at 37° C. for 48 hours, and then cultured at 37° C. for 24 hours, followed by dispensing 5×104 cells onto the transwells. The transwells were inserted into the lower wells and further cultured for 6 hours (education). In the case of pancreatic cancer cells, 5×104 cells of adipose-derived mesenchymal stem cells (ADMSCs) as a control group and pancreatic cancer cells (PANC-1) as a control group were dispensed onto the lower wells and cultured at 37° C. for 48 hours. Simultaneously with the culture of the lower well, like the lung cancer cells, ADMSCs were inoculated into a cell-free medium in which lung cancer cells (A549) had been cultured at 37° C. for 24 hours or a cell-free medium in which pancreatic cancer cells (PANC-1) had been culture at 37° C. for 48 hours, and then cultured at 37° C. for 24 hours, followed by dispensing 5×104 cells in the transwells. The transwells were inserted to the lower wells and the cells were further cultivated for 3 hours (education). As a result, as shown in
BALB/c nude mice were used to measure the in vivo mobility of stem cells according to an embodiment of the present invention. The tumor model mice was prepared by inoculating cancer cells (lung cancer cell: A549; brain cancer cell: U87MG; and pancreatic cancer cell: PANC-1) to stimulate stem cells, and after stem cells were injected, the stem cells in the tumor tissue were counted in order to evaluate their mobility to tumor tissue.
Particularly, lung cancer models were generated by inoculating BALB/c mice with 1×106 lung cancer cells (A549-luciferase-RFP) genetically engineered to express fluorescent proteins and a bioluminescence enzyme (luciferase). After 4 to 8 weeks, after confirming that the lung cancer was generated by analyzing the size of the lung cancer using in vivo imaging system (IVIS) (
As a result, as shown in
Particularly, pancreatic cancer model animals were generated by inoculating BALB/c nude mice with 1×106 pancreatic cancer cells (PANC-1-luciferase-RFP) genetically engineered to express fluorescent proteins and luciferase. After 4 to 8 weeks, after confirming that the lung cancer was generated by analyzing the size of the lung cancer using in vivo imaging system (IVIS) (
The brain tumor model animals were generated by inoculating BALB/c nude mice with 3×105 brain tumor cells (U87MG-luciferase-RFP) genetically engineered to express fluorescent proteins and luciferase, by injecting the brain tumor cells into the brain through surgery. After confirming the size of the brain tumor by using an in vivo imaging system (IVIS) (
As a result, as shown in
The present invention has been described with reference to the above-described embodiments, but these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments and experimental examples are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.
Number | Date | Country | Kind |
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10-2019-0083683 | Jul 2019 | KR | national |