WO2024095996A1 - 子宮処理用組成物、子宮環境改善剤、着床補助剤、胚移植液、精子移植液及び着床率改善剤 - Google Patents
子宮処理用組成物、子宮環境改善剤、着床補助剤、胚移植液、精子移植液及び着床率改善剤 Download PDFInfo
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- mesenchymal stem
- uterine
- implantation
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- C12N5/06—Animal cells or tissues; Human cells or tissues
Definitions
- the present invention relates to a uterine treatment composition, a uterine environment improvement agent, an implantation aid, an embryo transfer fluid, a sperm transfer fluid, and an implantation rate improvement agent.
- “Infertility” refers to a situation in which healthy men and women who wish to become pregnant are unable to conceive for a certain period of time, despite having unprotected sexual intercourse; the Japan Society of Obstetrics and Gynecology defines this "certain period” as “generally one year.” It is said that approximately one in ten couples is infertile, but in recent years, the age at which people begin to consider becoming pregnant has been rising, and it is known that pregnancy becomes more difficult for both men and women as they age, so this percentage is said to be even higher.
- causes of female infertility include ovulatory factors such as ovulatory disorders, fallopian tube factors such as blocked fallopian tubes, fallopian tube stenosis, and fallopian tube adhesions, uterine factors such as uterine fibroids and endometrial polyps, cervical factors such as cervicitis and abnormal mucus secretion from the cervix, and immune factors such as antisperm antibodies.
- ovulatory factors such as ovulatory disorders
- fallopian tube factors such as blocked fallopian tubes, fallopian tube stenosis, and fallopian tube adhesions
- uterine factors such as uterine fibroids and endometrial polyps
- cervical factors such as cervicitis and abnormal mucus secretion from the cervix
- immune factors such as antisperm antibodies.
- the mucus that fills the inside of the cervix changes, creating an environment that allows sperm to enter the uterus.
- Sperm then reach the uterus and acquire the ability to penetrate the zona pellucida on the surface of the egg, but if there is little secretion of this mucus, or if this mucus is not suitable for the sperm to penetrate, it becomes difficult for sperm to reach the uterus, making it difficult for fertilization to occur, and making it difficult to become pregnant.
- sperm immobilizing antibodies are also secreted into the cervical mucus, preventing the passage of even motile sperm.
- Sperm immobilizing antibodies are also secreted into the fallopian tubes, and even if sperm are injected deep into the uterine cavity during artificial insemination, their passage is prevented within the fallopian tubes. Therefore, even at the time of fertilization, sperm immobilizing antibodies can prevent sperm from binding to the egg, which can result in infertility.
- Infertility treatment is carried out by selecting the most appropriate treatment method depending on the cause.
- the main treatment methods include timing methods, ovulation induction methods, artificial insemination, and assisted reproductive technology (ART) such as in vitro fertilization and microscopic fertilization.
- ART assisted reproductive technology
- the probability of giving birth to a child through advanced reproductive technology is said to be 11.7% on average per total treatment, but this varies depending on age. Up until about age 32, it is about 20%, but it decreases with age, and after age 40, it is 7-8%, so the current pregnancy rate cannot be said to be high.
- Infertility treatment also places a large physical and mental burden and is expensive. For this reason, the development of new infertility treatments is desired.
- Mesenchymal stem cells are multipotent precursor cells that were first isolated from bone marrow by Friedenstein (1982) (see Non-Patent Document 1). It has been revealed that mesenchymal stem cells exist in various tissues such as bone marrow, umbilical cord, and fat, and mesenchymal stem cell transplantation is expected to be a new treatment method for various intractable diseases (see Patent Documents 1 and 2). Recently, it has been discovered that cells with equivalent functions exist in interstitial cells of adipose tissue, placenta, umbilical cord, fetal membrane, etc. Therefore, mesenchymal stem cells are sometimes called stromal cells.
- the ERA test In order to improve the implantation rate, a method known as the ERA test, which tests the endometrial implantation ability, is known.
- the ERA test measures the most favorable timing for implantation by looking at the gene expression profile of endometrial tissue, but does not improve the implantation rate itself.
- the present invention aims to provide an excellent infertility treatment that can increase the implantation rate of embryos (fertilized eggs) by improving the uterine environment.
- the present inventors have found that a culture supernatant of mesenchymal stem (stromal) cells (MSCs) increases the implantation rate, and have completed the present invention.
- MSCs mesenchymal stem cells
- the gist of the present invention is as follows. [1] A composition for treating the uterus, comprising a mesenchymal stem cell culture supernatant. [2] The uterine treatment composition described in [1], which is used as a uterine environment improving agent, implantation aid, embryo transfer fluid, sperm transfer fluid or implantation rate improving agent.
- the composition for treating the uterus described in [1], wherein the mesenchymal stem cell culture supernatant is a mesenchymal stem cell culture supernatant obtained by culturing mesenchymal stem cells in a serum-free medium.
- the present invention can improve the uterine environment and increase the implantation rate.
- a uterus treated with the uterine treatment composition of the present invention it is expected that, for example, decidualization will be promoted and the implantation rate of embryos (fertilized eggs) in artificial insemination and in vitro fertilization will be improved.
- FIG. 1 shows the blood vessel induction effect in the uterus by mesenchymal stem cell culture supernatant.
- FIG. 2 shows changes in the endometrium caused by mesenchymal stem cell culture supernatant (PAS staining (glycogen) and immunostaining for the cell proliferation marker Ki67).
- FIG. 3 shows changes in the endometrium caused by the culture supernatant of mesenchymal stem cells (HE staining).
- FIG. 4 shows changes in the endometrium caused by mesenchymal stem cell culture supernatant (PAS staining (glycogen)).
- FIG. 1 shows the blood vessel induction effect in the uterus by mesenchymal stem cell culture supernatant.
- FIG. 2 shows changes in the endometrium caused by mesenchymal stem cell culture supernatant (PAS staining (glycogen) and immunostaining for the cell proliferation marker Ki67).
- FIG. 3 shows changes in the endometrium caused by
- FIG. 5 shows endometrial morphology after transplantation of a fertilized egg into a uterus treated with a mesenchymal stem cell culture supernatant.
- FIG. 6 is a graph showing the effect of mesenchymal stem cell culture supernatant in improving the implantation rate (pregnancy rate) during in vitro fertilized egg transfer.
- FIG. 7 shows the proliferation-promoting effect of mesenchymal stem cell culture supernatant on endometrial epithelial cells.
- FIG. 8 is a diagram showing that mesenchymal stem cell culture supernatant has no proliferation-promoting effect on endometrial stromal cells.
- FIG. 9-1 is a graph showing the implantation rate in the in vitro fertilization in Example 6.
- FIG. 9-2 is a graph showing the pregnancy rate in in vitro fertilization in Example 6.
- the uterine treatment composition of the present invention will be described in detail below.
- the uterine environment improving agent, implantation aid, embryo transfer fluid, sperm transfer fluid, and implantation rate improving agent of the present invention will also be described.
- the uterine treatment composition of the present invention is characterized by containing mesenchymal stem cell culture supernatant.
- the uterine treatment composition of the present invention contains mesenchymal stem cell culture supernatant, which can improve the uterine environment and increase the implantation rate.
- the uterus treated with the uterine treatment composition of the present invention can be expected to promote decidualization, improve the implantation rate of embryos (fertilized eggs) in artificial insemination and in vitro fertilization, etc.
- the uterine treatment composition of the present invention may contain other components in addition to the essential component mesenchymal stem cell culture supernatant, as long as the effects of the present invention are not impaired.
- the mesenchymal stem cell culture supernatant is a culture supernatant obtained when mesenchymal stem cells are cultured.
- mesenchymal stem cells refer to cells that have the ability to differentiate into one or more types of cells belonging to the mesenchymal system (such as bone cells, cardiac muscle cells, chondrocytes, tendon cells, and adipocytes) and can proliferate while maintaining this ability.
- the term mesenchymal stem cells used in the present invention refers to the same cells as interstitial cells and does not particularly distinguish between the two. They may also be simply referred to as mesenchymal cells.
- tissues that contain mesenchymal stem cells include adipose tissue, umbilical cord, bone marrow, umbilical cord blood, endometrium, placenta, amniotic membrane, chorion, decidua, dermis, skeletal muscle, periosteum, dental follicle, periodontal ligament, dental pulp, and tooth germ.
- Mesenchymal stem cells in the present invention include those derived from adipose tissue, umbilical cord, bone marrow, umbilical cord blood, endometrium, placenta, amniotic membrane, chorion, decidua, dermis, skeletal muscle, periosteum, dental follicle, periodontal ligament, dental pulp, tooth germ, etc., among which adipose tissue-derived mesenchymal stem cells, umbilical cord-derived mesenchymal stem cells, and bone marrow-derived mesenchymal stem cells are preferred, and adipose tissue-derived mesenchymal stem cells and umbilical cord-derived mesenchymal stem cells are more preferred.
- Mesenchymal stem cell species in the present invention include humans, horses, cows, sheep, pigs, dogs, cats, rabbits, mice, and rats.
- the mesenchymal stem cells in the present invention may be derived from the same species as the subject (subject) to be treated, or may be derived from a different species.
- Mesenchymal stem cells may be cells provided by, for example, PromoCell, Lonza, Biological Industries, Veritas, R&D Systems, and Corning, or may be cells prepared by methods well known to those skilled in the art.
- mesenchymal stem cells may be primary cells isolated from donor tissue, or may be established cell lines.
- the medium used for culturing mesenchymal stem cells is not particularly limited as long as it is a medium that can culture mesenchymal stem cells while maintaining their good state.
- the medium is a medium that can proliferate human mesenchymal stem cells while maintaining their differentiation ability into bone cells, chondrocytes, and adipocytes.
- the medium used in the present invention may be prepared by adding serum to a basal medium and/or adding one or more serum substitutes such as albumin, transferrin, fatty acids, insulin, sodium selenite, cholesterol, collagen precursors, trace elements, 2-mercaptoethanol, 3'-thiolglycerol, etc.
- serum substitutes such as albumin, transferrin, fatty acids, insulin, sodium selenite, cholesterol, collagen precursors, trace elements, 2-mercaptoethanol, 3'-thiolglycerol, etc.
- these media may further contain, as necessary, amino acids such as glutamine, sugars such as glucose, metal salts such as sodium chloride and magnesium sulfate, trace metals such as selenium, lipids such as cholesterol and unsaturated fatty acids, vitamins such as pantothenic acid, proteins such as albumin, insulin, transferrin, growth factors, cytokines, polysaccharides, low molecular weight compounds, antibiotics, antioxidants, pyruvic acid, buffers, inorganic salts, etc.
- amino acids such as glutamine
- sugars such as glucose
- metal salts such as sodium chloride and magnesium sulfate
- trace metals such as selenium
- lipids such as cholesterol and unsaturated fatty acids
- vitamins such as pantothenic acid
- proteins such as albumin, insulin, transferrin, growth factors, cytokines, polysaccharides, low molecular weight compounds
- antibiotics antioxidants
- pyruvic acid buffers, inorganic salts, etc.
- basal medium examples include IMDM medium, Medium 199 medium, Eagle's Minimum Essential Medium (EMEM) medium, ⁇ MEM medium, Dulbecco's modified Eagle's Medium (DMEM) medium, Ham's F12 medium, RPMI 1640 medium, Fischer's medium, MCDB201 medium, and mixed media thereof.
- EMEM Eagle's Minimum Essential Medium
- DMEM Dulbecco's modified Eagle's Medium
- Ham's F12 medium Ham's F12 medium
- RPMI 1640 medium Fischer's medium
- MCDB201 medium examples of the basal medium.
- the medium used for culturing the mesenchymal stem cells used in the present invention is preferably a xeno-free medium that does not contain xenogeneic components such as serum, from the viewpoint of using it for treating the uterus.
- examples of such media include mesenchymal stem cell growth medium 2 (Ready-to-use, manufactured by PromoCell), mesenchymal stem cell growth medium XF (Ready-to-use, manufactured by PromoCell), MSCGM BulletKittm, MSCGMtm Mesenchymal Stem Cell Growth Medium BulletKittm (manufactured by Lonza), and xeno-free medium for human mesenchymal stem cells (MSC NutriStem (registered trademark) XF, Biological Examples of such a medium include media provided as media prepared in advance for mesenchymal stem cells (stromal cells), such as serum-free medium for adipose-derived stem cells (KBM ADSC-4, Kohjin Bio Co., Ltd.
- serum examples include, but are not limited to, human serum, fetal bovine serum (FBS), bovine serum, calf serum, goat serum, horse serum, porcine serum, sheep serum, rabbit serum, rat serum, etc.
- FBS fetal bovine serum
- bovine serum calf serum
- goat serum horse serum
- porcine serum sheep serum
- rabbit serum rat serum
- serum it may be added to the basal medium at 5 v/v % to 15 v/v %, preferably 10 v/v %.
- fatty acids include, but are not limited to, linoleic acid, oleic acid, linoleic acid, arachidonic acid, myristic acid, palmitoyl acid, palmitic acid, and stearic acid.
- lipids include, but are not limited to, phosphatidylserine, phosphatidylethanolamine, and phosphatidylcholine.
- amino acids include, but are not limited to, L-alanine, L-arginine, L-aspartic acid, L-asparagine, L-cysteine, L-cystine, L-glutamic acid, L-glutamine, and L-glycine.
- proteins include, but are not limited to, ecotin, reduced glutathione, fibronectin, and ⁇ 2-microglobulin.
- polysaccharides include glycosaminoglycans, and among glycosaminoglycans, in particular, hyaluronic acid, heparan sulfate, and the like, are exemplified by these, but are not limited to these.
- growth factors include, but are not limited to, platelet-derived growth factor (PDGF), basic fibroblast growth factor (bFGF), transforming growth factor beta (TGF- ⁇ ), hepatocyte growth factor (HGF), epidermal growth factor (EGF), connective tissue growth factor (CTGF), and vascular endothelial growth factor (VEGF).
- the mesenchymal stem cell culture supernatant obtained by the method described below can be used as the mesenchymal stem cell culture supernatant of the present invention.
- the mesenchymal stem cell culture supernatant of the present invention may also be a supernatant from which unnecessary components have been removed by means of dialysis, ultrafiltration, or the like, a fraction obtained by fractionating the supernatant using a column or the like, a fraction selected using an antibody against a specific molecule, or a fraction obtained by centrifugation.
- the medium used to obtain the culture supernatant can be the same as the medium for culturing mesenchymal stem cells.
- the method for obtaining the culture supernatant is not particularly limited as long as it is a method suitable for culturing each mesenchymal stem cell, but for example, it is a method of culturing mesenchymal stem cells at a temperature of 20°C to 37°C in a 2% to 7% CO2 environment, a 5% to 21% O2 environment, preferably at room temperature to 37°C in a 5% CO2 environment, and obtaining the culture supernatant.
- the mesenchymal stem cell culture supernatant of the present invention may be any culture supernatant as long as the mesenchymal stem cells come into contact with the medium, and the washing liquid obtained by washing the mesenchymal stem cells with the medium can also be used as the culture supernatant of the present invention.
- the contact time between the mesenchymal stem cells and the medium is, for example, within 14 days, preferably within 10 days, more preferably within 7 days, and even more preferably within 5 days.
- the culture for obtaining the culture supernatant may be a plate culture in which the cells are attached to a flask, or a suspension/agitation culture in which the cells are attached to microbeads or the like.
- the amount of mesenchymal stem cell culture supernatant contained in the uterine treatment composition of the present invention is 0.1% to 100% by weight of the entire uterine treatment composition, preferably 0.5% to 95% by weight, more preferably 1% to 90% by weight, even more preferably 3% to 80% by weight, and particularly preferably 5% to 50% by weight.
- the uterine treatment composition of the present invention is excellent in improving the uterine environment and increasing the implantation rate.
- the uterine treatment composition of the present invention may contain other components in addition to the mesenchymal stem cell culture supernatant, as long as they do not interfere with the effects of the present invention.
- other components include protective agents such as dimethyl sulfoxide (DMSO) and serum albumin, antibiotics, vitamins, carriers, excipients, disintegrants, buffers, emulsifiers, stabilizers, preservatives, antiseptics, and physiological saline.
- the target species of the uterine treatment composition of the present invention may be any mammal, including, for example, humans, horses, cows, sheep, pigs, dogs, cats, rabbits, mice, rats, and rare animals.
- the uterine treatment composition of the present invention is used as a liquid preparation that comes into direct contact with the uterus, such as an implantation aid, an embryo transfer liquid, an agent for improving the uterine environment, a sperm transfer liquid, and an agent for improving the implantation rate.
- the implantation aid is a preparation that helps the fertilized egg to make contact with the uterine lining and settle in the uterus, which is called "implantation.”
- the embryo transfer fluid is a solution in which the embryo (fertilized egg) is placed during “embryo transfer,” in which the embryo (fertilized egg) is grown to a certain extent and then returned to the uterus.
- the uterine environment improver is a preparation used to improve the environment inside the uterus to a state more suitable for pregnancy.
- the uterine environment improver of the present invention can be used for artificial insemination/in vitro fertilization (improving the success rate and efficiency), livestock breeding (improving the success rate and efficiency of artificial insemination, breeding/species maintenance (e.g., maintenance of endangered species, maintenance or crossbreeding of pet lines), and treatment/improvement of various diseases caused primarily or secondary by uterine disorders (e.g., uterine disorders after malignant tumor surgery or chemotherapy).
- the sperm transfer fluid is a solution for suspending sperm when injecting sperm into the uterus during artificial insemination.
- the implantation rate improver is a preparation for improving the implantation rate of the embryo (fertilized egg).
- the uterine treatment composition of the present invention acts on the uterus, increasing the expression of implantation-related genes in endometrial epithelial cells and inducing decidualization.
- implantation-related genes include Lif (Leukemia Inhibitory Factor), FOXO1 (Forkhead box protein O1), Hoxa-10 (Homeobox A10), Integrin beta-3 (Integrin ⁇ 3, Int3b), etc.
- the uterine treatment composition of the present invention can be prepared by mixing the above-mentioned mesenchymal stem cell culture supernatant with other necessary ingredients in a conventional manner.
- Example 1 Preparation of culture supernatant and detection of components contained in the culture supernatant
- Umbilical cord mesenchymal stem cells C-12971 Human Mesenchymal Stem Cells from Umbilical Cord Matrix (hMSC-UC), manufactured by Promocell
- RIM medium serum-free medium for mesenchymal stem cells, containing EGF, bFGF, albumin, transferrin and insulin, manufactured by Rohto
- RS medium serum-free medium for mesenchymal stem cells, containing EGF, bFGF, albumin, transferrin and insulin, manufactured by Rohto
- 1D RIM culture supernatant and “1D RS culture supernatant”, respectively.
- Various factors contained in each culture supernatant were measured by ELISA, and it was confirmed that each contained PGE2, IL-6, HGF, MCP1, MMP2, BDNF, and CD63+ exosomes.
- Example 2 Blood vessel induction
- HTF medium manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.
- HTF medium control
- No supernatant as a negative control were injected into the uterus of 8-week-old female mice.
- HTF medium control
- 8-week-old female mice were mated with 12-week-old male mice. Two days after injection, the uterus was removed, and the image is shown in FIG. 1. The percentage of uteruses in which blood vessel induction occurred under each condition is also shown in the graph.
- Example 3 Changes in the endometrium (improvement of the uterine environment)
- HTF medium manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.
- 1D RIM culture supernatant had been added so that the final concentration was 10%
- HTF medium control
- As a positive control 8-week-old female mice were mated with 12-week-old male mice. Two days after injection, the uterus was removed, fixed with 4% paraformaldehyde for 12 hours, and then embedded in paraffin. The embedded uterus was cut into sections and subjected to PAS staining to stain glycogen and immunostaining using an antibody that recognizes Ki67, a cell proliferation marker. The stained images are shown in FIG. 2.
- HTF medium manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.
- HTF medium control
- no supernatant had been added as a negative control
- corn oil was surgically injected to induce endometrial decidualization.
- the uterus was removed and fixed in 4% paraformaldehyde for 12 hours, and then embedded in paraffin.
- the embedded uterus was sectioned and stained with HE to observe the morphology, and stained with PAS to verify the glycogen accumulation.
- the HE stained image is shown in Figure 3
- PAS stained image is shown in Figure 4.
- Example 4 In Vitro Fertilization-1
- HTF medium manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.
- HTF medium control
- the implantation rate (pregnancy rate) of IVF fertilized eggs increased by treating the uterus with cell culture supernatant.
- Example 5 In vitro culture of endometrial and stromal cells
- the uterus was excised from 12-week-old C57BL6 female mice that had been administered estradiol to induce estrus.
- the excised uterus was then dissected and treated with HBSS solution (CaCl 2 ⁇ 2H 2 O 0.185 g/L, MgSO 4 0.098 g/L, KCl 0.400 g/L, KH 2 PO 4 0.060 g/L, NaHCO 3 0.350 g/L, NaCl 8.000 g/L, Na 2 HPO 4 0.048 g/L, D-Glucose 1.0 g/L) containing 25 mg/mL pancreatin (P1750; Sigma-Aldrich) and 0.25% (v/v) trypsin -EDTA (Nacalai Tesque ) to isolate epithelial cells.
- HBSS solution CaCl 2 ⁇ 2H 2 O 0.185 g/L, MgSO
- the cell suspension was seeded on a collagen-coated dish (manufactured by IWAKI) and then treated with HBSS containing 0.1 mg/mL collagenase type I (Worthington) and 0.05% (v/v) trypsin-EDTA to isolate interstitial cells.
- These cells were seeded on a collagen-coated dish and cultured for 48 hours in a humid environment at 37° C., 5% CO 2 , 95% air, using modified DMEM and Ham's F-12 medium (10% fetal bovine serum, 100 U/mL penicillin, 100 ⁇ g/mL streptomycin) containing 10% 1D RIM culture supernatant or modified DMEM and Ham's F-12 medium without culture supernatant as a control.
- modified DMEM and Ham's F-12 medium (10% fetal bovine serum, 100 U/mL penicillin, 100 ⁇ g/mL streptomycin) containing 10% 1D RIM culture supernatant or modified DMEM and Ham's F-12 medium without culture supernatant as a control.
- the cells were detached using 0.25% (v/v) trypsin, and the cell number was measured using an Automated Cell Counter TC20TM.
- Oxygen consumption rate (OCR) and extracellular oxidation rate (ECAR) in cultured cells were measured using an extracellular flux analyzer (XF HS Mini; Agilent Technologies). After detaching the cultured cells, they were suspended in RPMI medium (Agilent Technologies, supplemented with 10 mM D-glucose, 1 mM pyruvate, 2 mM L-glutamine, and 1% FBS) and seeded into wells for analysis.
- Extracellular flux analysis was performed based on a cycle of 9 minutes (Mix 3 min/Wait 3 min/Measure 3 min), and ECAR was measured after 5 cycles, followed by injection of D-Glucose (final concentration 10 mM; Agilent Technologies) and measurement for 3 cycles. The value measured in the 5th cycle was used as basal ECAR. Glycolysis was calculated by subtracting the basal ECAR value from the value measured in the 8th cycle.
- the OCR measurement is (1) RPMI medium only, 5 cycles [initial OCR] (2) ATP synthesis inhibition by Oligomycin (Sigma-Aldrich) at a final concentration of 1 ⁇ M for 3 cycles [post-oligomycin OCR] (3) Mitochondrial uncoupling using carbonyl cyanide 4-(trifluoromethoxy)phenylhydrazone (FCCP; Sigma-Aldrich) at a final concentration of 5 ⁇ M for three cycles [post-FCCP OCR] (4) Inhibition of the electron transport system by rotenone (Sigma-Aldrich)/antimycin A (Sigma-Aldrich) at a final concentration of 1 ⁇ M each (3 cycles [post-rotenone/antimycin-A OCR] The OCR measurement values at the final cycle under each condition were used for calculation (values at the 5th, 8th, 11th, and 14th cycles).
- Example 6 In Vitro Fertilization-2
- Umbilical cord mesenchymal stem cells C-12971 Human Mesenchymal Stem Cells from Umbilical Cord Matrix (hMSC-UC), manufactured by Promocell
- RIM medium regenerative medicine product material eligibility consultation confirmation and drug substance registration master register application planned, serum-free medium for mesenchymal stem cells, containing EGF, bFGF, albumin, transferrin and insulin, manufactured by Rohto
- serum-free medium for mesenchymal stem cells containing EGF, bFGF, albumin, transferrin and insulin, manufactured by Rohto
- 1D RIM culture supernatants Various factors contained in each culture supernatant were measured by ELISA, and it was confirmed that all contained PGE2, IL-6, HGF, MCP1, MMP2, BDNF and CD63+ exosomes.
- In vitro fertilization was performed using eggs collected from 3-week-old female mice and sperm collected from 12-week-old male mice to produce in vitro fertilized eggs.
- the in vitro fertilized eggs produced were then transplanted into the oviducts of 8-week-old female mice, and HTF medium (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) containing 1D RIM culture supernatant to a final concentration of 10% was then injected into the uterus of 8-week-old female mice on days 0, 3, and 4, with the day of transplantation of the in vitro fertilized eggs being designated as day 1.
- Evans blue solution was injected into the mouse tail vein, the uterus was removed, and the number of implantations was counted.
- the implantation rate and pregnancy rate were also measured, and are shown in Figure 9-1 (implantation rate) and Figure 9-2 (pregnancy rate).
- the implantation rate (pregnancy rate) of IVF fertilized eggs increased by treating the uterus with cell culture supernatant.
- 1D RIM culture supernatant Furthermore, in the HTF medium group supplemented with 1D RIM culture supernatant, increased expression of implantation-related genes (Lif, FOXO1, Hoxa-10, Int3b) in endometrial epithelial cells was confirmed, suggesting the possibility that preparation for implantation in endometrial epithelial cells is promoted. Furthermore, nuclear translocation of FOXO1 was observed, which is thought to induce decidualization. 1D RIM culture supernatant was found to have the effects of improving the uterine environment, assisting in implantation of fertilized eggs, and improving the implantation rate. 1D RIM culture supernatant can be suitably used as a uterine environment improver, implantation aid, embryo transfer fluid, sperm transfer fluid, or implantation rate improver.
- the uterine treatment composition of the present invention can be used for artificial insemination/in vitro fertilization (improving the success rate and efficiency), livestock breeding (improving the success rate and efficiency of artificial insemination), breeding/species maintenance (e.g., preserving endangered species, maintaining or crossbreeding pet lineages), and treating/improving various diseases whose primary or secondary cause is uterine disorders (e.g., uterine disorders following malignant tumor surgery or chemotherapy).
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Abstract
本発明は、子宮環境を改善することで、胚(受精卵)の着床率を上昇させることが可能な、優れた不妊治療を提供することを目的とする。本発明は、間葉系幹細胞培養上清を含む、子宮処理用組成物であり、子宮環境改善剤、着床補助剤、胚移植液、精子移植液又は着床率改善剤として用いられる。上記間葉系幹細胞は、脂肪組織由来、臍帯組織由来、又は骨髄組織由来であることが好ましい。
Description
本発明は、子宮処理用組成物、子宮環境改善剤、着床補助剤、胚移植液、精子移植液及び着床率改善剤に関する。
「不妊」とは、妊娠を望む健康な男女が避妊をしないで性交をしているにもかかわらず、一定期間妊娠しないものをいい、日本産科婦人科学会では、この「一定期間」を「1年というのが一般的である」と定義している。不妊のカップルは約10組に1組と言われているが、近年、妊娠を考える年齢が上昇しており、男女とも加齢により妊娠が起こりにくくなることが知られているため、この割合はもっと高いとも言われている。
女性の不妊症の原因には、排卵障害などの排卵因子、卵管の閉塞、卵管の狭窄、卵管の癒着などの卵管因子、子宮筋腫や子宮内膜ポリープなどの子宮因子、子宮頸管炎、子宮頸管からの粘液分泌異常など頸管因子、抗精子抗体など免疫因子がある。
子宮筋腫や子宮の先天的な形態異常などにより子宮内膜の血流が悪い、子宮内に過去の手術や炎症による癒着などがあると、子宮内に到達した胚が子宮にくっ付いて育つことを妨げ、妊娠しづらくなる。
子宮頸管では排卵が近づくと、子宮頸管の内部を満たす粘液が変化し、精子が子宮内に入っていく環境が整えられる。そして、精子は子宮内に到達し、卵子表面の透明帯を貫通する能力を獲得するが、この粘液の分泌が少ない、この粘液が精子の上記貫通に適していない等により、精子が子宮内に到達しにくくなり、受精が成立しにくく、妊娠しづらくなる。
また、何らかの免疫異常で精子不動化抗体等の抗精子抗体を産生する女性では、抗体が頸管粘液内にも分泌され、例え運動性の良い精子でも通過を妨げてしまう。また卵管内にも精子不動化抗体は分泌され、人工授精で精子を子宮腔の奥まで注入しても、卵管内でその通過が妨げられてしまう。そのため受精の場面でも、精子不動化抗体は精子が卵子と結合することを妨害し、不妊症になることがある。
不妊症の治療は、原因に応じて最適な治療法を選択して行なわれている。主な治療法には、タイミング法、排卵誘発法、人工授精、さらには体外受精、顕微鏡受精などの高度生殖医療(ART:Assisted Reproductive Technology)がある。高度生殖医療で子どもが生まれる確率は総治療あたり平均で11.7%と言われているが、年齢によって異なり、32歳くらいまでは約20%であるが、年齢とともに下降し、40歳を過ぎると7~8%であり、妊娠率は高いとは言えない現状がある。また、不妊治療は肉体的及び精神的負担が大きく、費用も高額となる。そのため、新たな不妊治療の開発が望まれている。
間葉系幹細胞は、Friedenstein(1982)によって初めて骨髄から単離された多分化能を有する前駆細胞である(非特許文献1参照)。間葉系幹細胞は、骨髄、臍帯、脂肪等の様々な組織に存在することが明らかにされており、間葉系幹細胞移植は、様々な難治性疾患に対する新しい治療方法として、期待されている(特許文献1~2参照)。最近では、脂肪組織、胎盤、臍帯、卵膜等の間質細胞に同等の機能を有する細胞が存在することが知られている。従って、間葉系幹細胞を間質細胞(Mesenchymal Stromal Cell)と称することもある。
Pittenger F. M. et al., Science 284, pp.143-147, 1999
着床率を改善するために、子宮内膜着床能を検査するERA検査とよばれる手法が知られている。ERA検査は子宮内膜組織の遺伝子発現プロファイルをみることで着床しやすいタイミングを計るものであり、着床率自身を改善するものではない。着床しやすい子宮環境を改善する方法は少なく、新たな改善方法の開発が望まれていた。本発明は、上述のような状況の中、子宮環境を改善することで、胚(受精卵)の着床率を上昇させることが可能な優れた不妊治療を提供することを目的とする。
上記課題を解決するために鋭意研究した結果、本発明者らは、間葉系幹細胞(mesenchymal stem(stromal) cell;MSC)の培養上清が、着床率を上げることを見出し、本発明を完成させた。本発明によれば、子宮環境を改善し、胚(受精卵)の着床率を上昇させることができる。すなわち本発明の要旨は、以下の通りである。
[1]間葉系幹細胞培養上清を含む、子宮処理用組成物。
[2]子宮環境改善剤、着床補助剤、胚移植液、精子移植液又は着床率改善剤として用いられる、[1]に記載の子宮処理用組成物。
[3]間葉系幹細胞が、脂肪組織由来、臍帯組織由来、又は骨髄組織由来である、[1]又は[2]に記載の子宮処理用組成物。
[4]間葉系幹細胞培養上清が、血清を含まない培地での間葉系幹細胞の培養から得られた間葉系幹細胞培養上清である、[1]に記載の子宮処理用組成物。
[1]間葉系幹細胞培養上清を含む、子宮処理用組成物。
[2]子宮環境改善剤、着床補助剤、胚移植液、精子移植液又は着床率改善剤として用いられる、[1]に記載の子宮処理用組成物。
[3]間葉系幹細胞が、脂肪組織由来、臍帯組織由来、又は骨髄組織由来である、[1]又は[2]に記載の子宮処理用組成物。
[4]間葉系幹細胞培養上清が、血清を含まない培地での間葉系幹細胞の培養から得られた間葉系幹細胞培養上清である、[1]に記載の子宮処理用組成物。
本発明によると、子宮環境を改善し、着床率を向上することができる。本発明の子宮処理用組成物で処理した子宮においては、例えば脱落膜化の促進、人工授精、体外受精における胚(受精卵)の着床率の向上等が期待できる。
以下、本発明の子宮処理用組成物について詳細に説明する。また、本発明の子宮環境改善剤、着床補助剤、胚移植液、精子移植液、着床率改善剤についても説明する。
[子宮処理用組成物]
本発明の子宮処理用組成物は、間葉系幹細胞培養上清を含むことを特徴とする。本発明の子宮処理用組成物は、間葉系幹細胞培養上清を含むことで、子宮環境を改善し、着床率を向上することができる。本発明の子宮処理用組成物で処理した子宮は、例えば脱落膜化の促進、人工授精、体外受精における胚(受精卵)の着床率の向上等が期待できる。本発明の子宮処理用組成物は、必須成分である間葉系幹細胞培養上清に加えて、本発明の効果を損なわない範囲で、その他の成分を含んでもよい。
本発明の子宮処理用組成物は、間葉系幹細胞培養上清を含むことを特徴とする。本発明の子宮処理用組成物は、間葉系幹細胞培養上清を含むことで、子宮環境を改善し、着床率を向上することができる。本発明の子宮処理用組成物で処理した子宮は、例えば脱落膜化の促進、人工授精、体外受精における胚(受精卵)の着床率の向上等が期待できる。本発明の子宮処理用組成物は、必須成分である間葉系幹細胞培養上清に加えて、本発明の効果を損なわない範囲で、その他の成分を含んでもよい。
(間葉系幹細胞培養上清)
本発明において間葉系幹細胞培養上清とは、間葉系幹細胞を培養した際に得られる培養上清である。
本発明において間葉系幹細胞培養上清とは、間葉系幹細胞を培養した際に得られる培養上清である。
本発明において間葉系幹細胞とは、間葉系に属する一種以上の細胞(骨細胞、心筋細胞、軟骨細胞、腱細胞、脂肪細胞など)への分化能を有し、当該能力を維持したまま増殖できる細胞を意味する。本発明において用いる間葉系幹細胞なる用語は、間質細胞と同じ細胞を意味し、両者を特に区別するものではない。また、単に間葉系細胞と表記される場合もある。間葉系幹細胞を含む組織としては、例えば、脂肪組織、臍帯、骨髄、臍帯血、子宮内膜、胎盤、羊膜、絨毛膜、脱落膜、真皮、骨格筋、骨膜、歯小嚢、歯根膜、歯髄、歯胚等が挙げられる。本発明における間葉系幹細胞としては、脂肪組織、臍帯、骨髄、臍帯血、子宮内膜、胎盤、羊膜、絨毛膜、脱落膜、真皮、骨格筋、骨膜、歯小嚢、歯根膜、歯髄、歯胚等由来のものが挙げられるが、中でも、脂肪組織由来間葉系幹細胞、臍帯由来間葉系幹細胞、骨髄由来間葉系幹細胞が好ましく、脂肪組織由来間葉系幹細胞、臍帯由来間葉系幹細胞がより好ましい。
本発明における間葉系幹細胞の種として、ヒト、ウマ、ウシ、ヒツジ、ブタ、イヌ、ネコ、ラビット、マウス、ラットが挙げられる。
本発明における間葉系幹細胞は、処置される対象(被検体)と同種由来であってもよいし、異種由来であってもよい。
間葉系幹細胞は、例えば、PromoCell社、Lonza社、Biological Industries社、Veritas社、R&D Systems社及びCorning社などから提供されている細胞であってもよく、当業者に周知の方法により調製した細胞であってもよい。また、間葉系幹細胞は、ドナーの組織から分離したプライマリーの細胞であってもよいし、株化された細胞であってもよい。
本発明において間葉系幹細胞を培養するために用いる培地は、間葉系幹細胞の状態を良好に保って培養することができる培地であれば特に限定されないが、例えば、骨細胞、軟骨細胞及び脂肪細胞への分化能を維持した状態でヒト間葉系幹細胞を増殖させることができる培地であることが好ましい。
本発明において用いる培地は、基礎培地に、血清を添加する、及び/又は、アルブミン、トランスフェリン、脂肪酸、インスリン、亜セレン酸ナトリウム、コレステロール、コラーゲン前駆体、微量元素、2-メルカプトエタノール、3’-チオールグリセロール等の1つ以上の血清代替物を添加して作製してもよい。また、これらの培地には、必要に応じて、さらに、グルタミンなどのアミノ酸類、グルコース等の糖類、塩化ナトリウムや硫酸マグネシウムなどの金属塩類、セレンなどの微量金属類、コレステロールや不飽和脂肪酸などの脂質類、パントテン酸などのビタミン類、アルブミン、インスリン、トランスフェリン、成長因子、増殖因子、サイトカインなどのタンパク質、多糖、低分子化合物、抗生物質、抗酸化剤、ピルビン酸、緩衝剤、無機塩類等の物質を添加してもよい。
上記基礎培地としては、例えば、IMDM培地、Medium 199培地、Eagle’s Minimum Essential Medium(EMEM)培地、αMEM培地、Dulbecco’s modified Eagle’s Medium(DMEM)培地、Ham’s F12培地、RPMI 1640培地、Fischer’s培地、MCDB201培地及びこれらの混合培地等が挙げられる。
本発明において用いる間葉系幹細胞を培養するために用いる培地は、子宮の処理に用いるという観点から、血清等の異種由来成分を含まない(ゼノフリー)培地であることが好ましい。このような培地としては、例えば、間葉系幹細胞増殖培地2(Mesenchymal Stem Cell Growth Medium 2 (Ready-to-use)PromoCell社製)、間葉系幹細胞増殖培地XF(Mesenchymal Stem Cell Growth Medium XF (Ready-to-use)、PromoCell社製)、MSCGM BulletKittm、MSCGMtm Mesenchymal Stem Cell Growth Medium BulletKittm(Lonza社製)、ヒト間葉系幹細胞用ゼノフリー培地(MSC NutriStem(登録商標) XF、Biological Industries社製)、MesenCult-ACF Plus(Veritas社製)、StemXVivotm Serum-Free Human MSC Expansion Media(R&D Systems社、Corning社製)脂肪由来幹細胞用無血清培地(KBM ADSC-4、コージンバイオ社製)及び間葉系幹細胞用無血清培地(R:STEM Medium for hMSC High Growth、Rohto社製)など、間葉系幹細胞(間質細胞)用として予め調製された培地として提供されている培地が挙げられる。
上記血清としては、例えば、ヒト血清、ウシ胎児血清(FBS)、ウシ血清、仔ウシ血清、ヤギ血清、ウマ血清、ブタ血清、ヒツジ血清、ウサギ血清、ラット血清等が挙げられるがこれらに限定されない。血清を用いる場合、基礎培地に対して、5v/v%から15v/v%、好ましくは、10v/v%を添加してもよい。
上記血清としては、例えば、ヒト血清、ウシ胎児血清(FBS)、ウシ血清、仔ウシ血清、ヤギ血清、ウマ血清、ブタ血清、ヒツジ血清、ウサギ血清、ラット血清等が挙げられるがこれらに限定されない。血清を用いる場合、基礎培地に対して、5v/v%から15v/v%、好ましくは、10v/v%を添加してもよい。
上記脂肪酸としては、リノール酸、オレイン酸、リノレイン酸、アラキドン酸、ミリスチン酸、パルミトイル酸、パルミチン酸、及びステアリン酸等が例示されるが、これらに限定されない。脂質は、フォスファチジルセリン、フォスファチジルエタノールアミン、フォスファチジルコリン等が例示されるが、これらに限定されない。アミノ酸は、例えば、L-アラニン、L-アルギニン、L-アスパラギン酸、L-アスパラギン、L-システイン、L-シスチン、L-グルタミン酸、L-グルタミン、L-グリシンなどを含むがこれらに限定されない。タンパク質は、例えば、エコチン、還元型グルタチオン、フィブロネクチン及びβ2-ミクログロブリン等が例示されるが、これらに限定されない。多糖は、グリコサミノグリカンが例示され、グリコサミノグリカンのうち特に、ヒアルロン酸、ヘパラン硫酸等が例示されるが、これらに限定されない。増殖因子は、例えば、血小板由来増殖因子(PDGF)、塩基性線維芽細胞成長因子(bFGF)、トランスフォーミング増殖因子ベータ(TGF-β)、肝細胞増殖因子(HGF)、上皮成長因子(EGF)、結合組織増殖因子(CTGF)、血管内皮細胞増殖因子(VEGF)等が例示されるが、これらに限定されない。
(間葉系幹細胞培養上清の調製)
以下の方法によって得られる間葉系幹細胞の上清を、本発明における間葉系幹細胞培養上清とすることができる。また、該上清から透析・限外濾過等の手段により不要な成分を除去したもの、該上清をカラム等で分画して得られる画分、特定の分子に対する抗体等を用いて選択した画分、遠心操作により取得した画分等を本発明における間葉系幹細胞培養上清としてもよい。
以下の方法によって得られる間葉系幹細胞の上清を、本発明における間葉系幹細胞培養上清とすることができる。また、該上清から透析・限外濾過等の手段により不要な成分を除去したもの、該上清をカラム等で分画して得られる画分、特定の分子に対する抗体等を用いて選択した画分、遠心操作により取得した画分等を本発明における間葉系幹細胞培養上清としてもよい。
培養上清を取得する際に用いる培地としては、間葉系幹細胞を培養するための培地と同様の培地を使用することができる。培養上清の取得方法は、それぞれの間葉系幹細胞の培養に適した方法であれば特に限定されないが、例えば、20℃~37℃の温度、2%~7%CO2環境下、5%~21%O2環境下、好ましくは室温~37℃、5%CO2環境下で間葉系幹細胞を培養し、その培養上清を取得する方法である。
本発明の間葉系幹細胞培養上清は、間葉系幹細胞と培地が接触すればよく、間葉系幹細胞を培地で洗浄することによって得られる洗浄液も、本発明における培養上清とすることができる。間葉系幹細胞と培地の接触時間は例えば、14日間以内、好ましくは10日間以内、さらに好ましくは7日間以内、より好ましくは5日間以内である。培養上清を取得するための培養は、フラスコに付着させて行われる平面培養であってもよいし、マイクロビーズ等に付着させた浮遊・撹拌培養であってもよい。
本発明の子宮処理用組成物が含む間葉系幹細胞培養上清の量としては、子宮処理用組成物全体の0.1重量%~100重量%であり、0.5重量%~95重量%であることが好ましく、1重量%~90重量%であることがより好ましく、3重量%~80重量%であることがさらに好ましく、5重量%~50重量%であることが特に好ましい。本発明の子宮処理用組成物が含む間葉系幹細胞培養上清の量を上記数値範囲内とすることで、本発明の子宮処理用組成物は、子宮環境を改善し、着床率を向上させる効果に優れる。
本発明の子宮処理用組成物は、間葉系幹細胞培養上清以外に、本発明の効果を妨げない範囲でその他の成分を含有してもよい。その他の成分としては、ジメチルスルフォキシド(DMSO)や血清アルブミン等の保護剤、抗生物質、ビタミン類、担体、賦形剤、崩壊剤、緩衝剤、乳化剤、安定剤、保存剤、防腐剤、生理食塩水等が挙げられる。
本発明の子宮処理用組成物の対象となる種として、哺乳動物であればよいが、例えばヒト、ウマ、ウシ、ヒツジ、ブタ、イヌ、ネコ、ラビット、マウス、ラット、希少動物が挙げられる。
本発明の子宮処理用組成物は、着床補助剤、胚移植液、子宮環境改善剤、精子移植液、着床率改善剤等の子宮に直接触れる液剤として用いられる。
着床補助剤とは、受精卵が子宮内膜に接して定着する「着床」が上手く起こるように補助するための製剤である。胚移植液とは、胚(受精卵)をある程度育ててから子宮に戻す「胚移植」の際に、胚(受精卵)を入れておくための溶液である。子宮環境改善剤とは、子宮内の環境を妊娠により適した状態に改善するために用いられる製剤のことである。本発明の子宮環境改善剤は、人工授精・体外受精(成功率や効率の向上)、家畜の繁殖(人工授精の成功率や効率の向上、育種・種の維持(例えば絶滅危惧種の維持、ペットの系統の維持又は交雑)、子宮障害が主因又は副因の各種疾患(例えば、悪性腫瘍術後又は化学療法後の子宮障害)の治療・改善等に利用され得る。精子移植液とは、人工授精において精子を子宮に注入する際に精子を懸濁するための溶液である。着床率改善剤は、胚(受精卵)の着床率を向上させるための製剤である。
本発明の子宮処理用組成物は、子宮に対して作用し、子宮内膜上皮細胞における着床関連遺伝子の発現を上昇させ、脱落膜化を誘導することができる。上記着床関連遺伝子としては、Lif(Leukemia Inhibitory Factor/白血病阻止因子)、FOXO1(Forkhead box protein O1)、Hoxa-10(Homeobox A10)、Integrin beta-3 (Integrin β3、Int3b)等が挙げられる。
本発明の子宮処理用組成物は、上述の間葉系幹細胞培養上清に、必要なその他の成分を混合し、常法により調製することができる。
以下に、実施例及び試験例を挙げて本発明を詳細に説明するが、本発明はこれらの実施例等によって限定されるものではない。
[実施例1:培養上清の調製及び培養上清の含有成分の検出]
臍帯間葉系幹細胞(C-12971 Human Mesenchymal Stem Cells from Umbilical Cord Matrix (hMSC-UC)、プロモセル社製)をRIM培地(間葉系幹細胞用無血清培地、EGF、bFGF、アルブミン、トランスフェリン及びインシュリンを含む、Rohto社)又はRS培地(間葉系幹細胞用無血清培地、EGF、bFGF、アルブミン、トランスフェリン及びインシュリンを含む、Rohto社)で3日間培養し、培養上清(以下、それぞれ「3D RIM培養上清」、「3D RS培養上清」という)を得た。また、3日間培養後、培地を交換して、更に1日間培養し、培養上清(以下、それぞれ「1D RIM培養上清」、「1D RS培養上清」という)を得た。各培養上清中に含まれる各種因子をELISAで測定したところ、いずれにもPGE2、IL-6、HGF、MCP1、MMP2、BDNF及びCD63+エクソソームが含まれることが確認できた。
臍帯間葉系幹細胞(C-12971 Human Mesenchymal Stem Cells from Umbilical Cord Matrix (hMSC-UC)、プロモセル社製)をRIM培地(間葉系幹細胞用無血清培地、EGF、bFGF、アルブミン、トランスフェリン及びインシュリンを含む、Rohto社)又はRS培地(間葉系幹細胞用無血清培地、EGF、bFGF、アルブミン、トランスフェリン及びインシュリンを含む、Rohto社)で3日間培養し、培養上清(以下、それぞれ「3D RIM培養上清」、「3D RS培養上清」という)を得た。また、3日間培養後、培地を交換して、更に1日間培養し、培養上清(以下、それぞれ「1D RIM培養上清」、「1D RS培養上清」という)を得た。各培養上清中に含まれる各種因子をELISAで測定したところ、いずれにもPGE2、IL-6、HGF、MCP1、MMP2、BDNF及びCD63+エクソソームが含まれることが確認できた。
[実施例2:血管誘導]
最終濃度が10%となるように3D RIM培養上清、又は1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)、上清を添加していない陰性コントロールとしてのHTFメディウム(コントロール)を、8週齢の雌マウスの子宮内へと注入した。陽性コントロールとして、8週齢の雌マウスを12週齢の雄マウスと交配させた。これらを注入した2日後に、子宮を摘出し、その画像を図1に示した。また、各条件下、血管誘導が起きていた子宮の割合をグラフに示した。
最終濃度が10%となるように3D RIM培養上清、又は1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)、上清を添加していない陰性コントロールとしてのHTFメディウム(コントロール)を、8週齢の雌マウスの子宮内へと注入した。陽性コントロールとして、8週齢の雌マウスを12週齢の雄マウスと交配させた。これらを注入した2日後に、子宮を摘出し、その画像を図1に示した。また、各条件下、血管誘導が起きていた子宮の割合をグラフに示した。
図1に示すとおり、細胞培養上清を添加することにより、血管が誘導され、性交刺激と同様の子宮変化を誘導することが確認できた。
[実施例3:子宮内膜の変化(子宮環境の改善)]
最終濃度が10%となるように1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)、上清を添加していない陰性コントロールとしてのHTFメディウム(コントロール)を、8週齢の雌マウスの子宮内へと注入した。陽性コントロールとして、8週齢の雌マウスを12週齢の雄マウスと交配させた。これらを注入した2日後に子宮を摘出し、4%パラホルムアルデヒドで12時間固定した後、パラフィン包埋した。包埋した子宮を切片にし、グリコーゲンを染色するPAS染色と、細胞増殖マーカーであるKi67を認識する抗体を用いた免疫染色に供試した。その染色像を図2に示した。
最終濃度が10%となるように1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)、上清を添加していない陰性コントロールとしてのHTFメディウム(コントロール)を、8週齢の雌マウスの子宮内へと注入した。陽性コントロールとして、8週齢の雌マウスを12週齢の雄マウスと交配させた。これらを注入した2日後に子宮を摘出し、4%パラホルムアルデヒドで12時間固定した後、パラフィン包埋した。包埋した子宮を切片にし、グリコーゲンを染色するPAS染色と、細胞増殖マーカーであるKi67を認識する抗体を用いた免疫染色に供試した。その染色像を図2に示した。
また、最終濃度が10%となるように1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)、上清を添加していない陰性コントロールとしてのHTFメディウム(コントロール)を、8週齢の雌マウスの子宮内へと注入した。4日後に、コーンオイルを外科的に注入し、子宮内膜の脱落膜化を誘導した。コーンオイルを注入した3日後に、子宮を摘出し、4%パラホルムアルデヒドで12時間固定した後、パラフィン包埋した。包埋した子宮を切片にし、形態を観察するためHE染色を行い、そのグリコーゲン蓄積を検証するためPAS染色を行った。HE染色像を図3に、PAS染色像を図4に示した。
3週齢の雌マウスから回収した卵と、12週齢の雄マウスから回収した精子を用いて、体外受精を行い、体外受精卵を作出した。最終濃度が10%となるように1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)、上清を添加していない陰性コントロールとしてのHTFメディウム(コントロール)を、8週齢の雌マウスの子宮内へと注入した翌日に、上記作出した体外受精卵を、卵管内に移植した。その7日後に子宮を摘出し、4%パラホルムアルデヒドで12時間固定した後、パラフィン包埋した。包埋した子宮を切片にし、HE染色によって形態を観察した。その染色像を図5に示した。
図2から5に示すとおり、細胞培養上清を子宮内に注入することにより、グリコーゲンの蓄積後、グリコーゲンを異化して細胞増殖すること、すなわち脱落膜化を促し、着床しやすい子宮内膜へと変化させ、子宮環境を改善できることが確認できた。
[実施例4:体外受精-1]
3週齢の雌マウスから回収した卵と、12週齢の雄マウスから回収した精子を用いて、体外受精を行い、体外受精卵を作出した。最終濃度が10%となるように1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)、上清を添加していない陰性コントロールとしてのHTFメディウム(コントロール)を、8週齢の雌マウスの子宮内へと注入した翌日に、作出した体外受精卵20個を、卵管内に移植した。その7日後に、マウス尾静脈からエバンズブルー溶液を注入した後、子宮を摘出し、着床数を計測した。またその着床率(妊娠率)を測定し、図6に示した。
3週齢の雌マウスから回収した卵と、12週齢の雄マウスから回収した精子を用いて、体外受精を行い、体外受精卵を作出した。最終濃度が10%となるように1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)、上清を添加していない陰性コントロールとしてのHTFメディウム(コントロール)を、8週齢の雌マウスの子宮内へと注入した翌日に、作出した体外受精卵20個を、卵管内に移植した。その7日後に、マウス尾静脈からエバンズブルー溶液を注入した後、子宮を摘出し、着床数を計測した。またその着床率(妊娠率)を測定し、図6に示した。
図6に示すとおり、細胞培養上清で子宮内を処理することにより、体外受精の受精卵の着床率(妊娠率)が上昇した。
[実施例5:子宮内膜・間質細胞の体外培養]
エストラジオールを投与し、発情を誘起した12週齢のC57BL6雌マウスから子宮を摘出した。摘出した子宮を切開した後、25mg/mLパンクレアチン(P1750;Sigma-Aldrich)と0.25%(v/v)トリプシンEDTA(nacalai tesque)を含むHBSS溶液(CaCl2・2H2O 0.185g/L、MgSO4 0.098g/L、KCl 0.400g/L、KH2PO4 0.060g/L、NaHCO3 0.350g/L、NaCl 8.000g/L、Na2HPO4 0.048g/L、D-Glucose 1.0g/L)で処理することで、上皮細胞を単離した。また、この細胞懸濁液をコラーゲンコートディッシュ(IWAKI製)に播種した後、0.1mg/mLコラゲナーゼタイプI(Worthington)と0.05%(v/v)トリプシンEDTAを含むHBSSで処理することで間質細胞を単離した。これら細胞をコラーゲンコートディッシュに播種し、1D RIM培養上清を10%含む改変DMEM and Ham’s F-12培地(10%ウシ胎児血清、100U/mLペニシリン、100μg/mLストレプトマイシン)あるいは、コントロールとして培養上清を含まない改変DMEM and Ham’s F-12培地を用いて、37℃、5%CO2、95%大気、湿潤環境下で48時間培養した。
エストラジオールを投与し、発情を誘起した12週齢のC57BL6雌マウスから子宮を摘出した。摘出した子宮を切開した後、25mg/mLパンクレアチン(P1750;Sigma-Aldrich)と0.25%(v/v)トリプシンEDTA(nacalai tesque)を含むHBSS溶液(CaCl2・2H2O 0.185g/L、MgSO4 0.098g/L、KCl 0.400g/L、KH2PO4 0.060g/L、NaHCO3 0.350g/L、NaCl 8.000g/L、Na2HPO4 0.048g/L、D-Glucose 1.0g/L)で処理することで、上皮細胞を単離した。また、この細胞懸濁液をコラーゲンコートディッシュ(IWAKI製)に播種した後、0.1mg/mLコラゲナーゼタイプI(Worthington)と0.05%(v/v)トリプシンEDTAを含むHBSSで処理することで間質細胞を単離した。これら細胞をコラーゲンコートディッシュに播種し、1D RIM培養上清を10%含む改変DMEM and Ham’s F-12培地(10%ウシ胎児血清、100U/mLペニシリン、100μg/mLストレプトマイシン)あるいは、コントロールとして培養上清を含まない改変DMEM and Ham’s F-12培地を用いて、37℃、5%CO2、95%大気、湿潤環境下で48時間培養した。
HBSSで洗浄した後、0.25%(v/v)トリプシンを用いて細胞を剥離し、Automated Cell Counter TC20TMを用いて細胞数を測定した。
培養細胞における酸素消費量(OCR)および細胞外酸化速度(ECAR)は細胞外フラックスアナライザー(XF HS Mini;Agilent Technologies)を用いて測定した。培養した細胞を剥離した後、RPMI培地(Agilent Technologies社製にD-Glucose 10mM、 ピルビン酸 1 mM、L-Glutamine 2mM、1%FBSを添加)で懸濁し、解析用ウェルに播種した。
細胞外フラックス解析は、1サイクル9分(Mix 3min/Wait 3min/Measure 3min)を基本として、ECARの測定は、5サイクル測定した後、D-Glucose(最終濃度10mM;Agilent Technologies)を注入し3サイクル測定した。Basal ECARは5サイクル目で測定した値を使用した。Glycolysisは8サイクル目の測定値からBasal ECARの値を引いて算出した。
OCRの測定は、
(1)RPMI培地のみ 5サイクル[initial OCR]
(2)最終濃度1μMのOligomycin(Sigma-Aldrich)によるATP合成阻害 3サイクル[post-oligomycin OCR]
(3)最終濃度5μM carbonyl cyanide 4-(trifluoromethoxy)phenylhydrazone(FCCP;Sigma-Aldrich)によるミトコンドリア脱共役 3サイクル[post-FCCP OCR]
(4)それぞれ最終濃度1μMのRotenone(Sigma-Aldrich)/Antimycin A(Sigma-Aldrich)による電子伝達系の阻害 3サイクル[post-rotenone/antimycin-A OCR]
を行なった。OCRの測定値は各条件の最終サイクル値を算出に使用した(5、8、11、14サイクル目の値)。
(1)RPMI培地のみ 5サイクル[initial OCR]
(2)最終濃度1μMのOligomycin(Sigma-Aldrich)によるATP合成阻害 3サイクル[post-oligomycin OCR]
(3)最終濃度5μM carbonyl cyanide 4-(trifluoromethoxy)phenylhydrazone(FCCP;Sigma-Aldrich)によるミトコンドリア脱共役 3サイクル[post-FCCP OCR]
(4)それぞれ最終濃度1μMのRotenone(Sigma-Aldrich)/Antimycin A(Sigma-Aldrich)による電子伝達系の阻害 3サイクル[post-rotenone/antimycin-A OCR]
を行なった。OCRの測定値は各条件の最終サイクル値を算出に使用した(5、8、11、14サイクル目の値)。
各指標は以下の手順で算出した:
Basal OCR=initial OCR-post-rotenone/antimycin-A OCR
ATP Production=Basal OCR-post-oligomycin OCR
Basal OCR=initial OCR-post-rotenone/antimycin-A OCR
ATP Production=Basal OCR-post-oligomycin OCR
図7に示すように上清を添加することにより子宮内膜上皮細胞の増殖を有意に促進した。一方、子宮内膜間質細胞においては、上清を添加することによる増殖促進効果は得られず(図8)、その作用は子宮内膜上皮細胞選択的であった。
[実施例6:体外受精-2]
臍帯間葉系幹細胞(C-12971 Human Mesenchymal Stem Cells from Umbilical Cord Matrix (hMSC-UC)、プロモセル社製)をRIM培地(再生医療等製品材料適格性相談確認書及び原薬等登録原簿登録申請予定、間葉系幹細胞用無血清培地、EGF、bFGF、アルブミン、トランスフェリン及びインシュリンを含む、Rohto社)で3日間培養後、培地を交換して、更に1日間培養し、培養上清(以下、それぞれ「1D RIM培養上清」、という)を得た。各培養上清中に含まれる各種因子をELISAで測定したところ、いずれにもPGE2、IL-6、HGF、MCP1、MMP2、BDNF及びCD63+エクソソームが含まれることが確認できた。
臍帯間葉系幹細胞(C-12971 Human Mesenchymal Stem Cells from Umbilical Cord Matrix (hMSC-UC)、プロモセル社製)をRIM培地(再生医療等製品材料適格性相談確認書及び原薬等登録原簿登録申請予定、間葉系幹細胞用無血清培地、EGF、bFGF、アルブミン、トランスフェリン及びインシュリンを含む、Rohto社)で3日間培養後、培地を交換して、更に1日間培養し、培養上清(以下、それぞれ「1D RIM培養上清」、という)を得た。各培養上清中に含まれる各種因子をELISAで測定したところ、いずれにもPGE2、IL-6、HGF、MCP1、MMP2、BDNF及びCD63+エクソソームが含まれることが確認できた。
3週齢の雌マウスから回収した卵と、12週齢の雄マウスから回収した精子を用いて、体外受精を行い、体外受精卵を作出した。8週齢の雌マウスの卵管内に、作出した体外受精卵を移植した後、最終濃度が10%となるように1D RIM培養上清を添加したHTFメディウム(富士フィルム和光純薬社製)を、体外受精卵の移植日を1日目とし、0,3,4日目に8週齢の雌マウスの子宮内へと注入した。その7日後に、マウス尾静脈からエバンズブルー溶液を注入した後、子宮を摘出し、着床数を計測した。またその着床率及び妊娠率を測定し、図9-1(着床率)及び図9-2(妊娠率)に示した。
図9-1及び9-2に示すとおり、細胞培養上清で子宮内を処理することにより、体外受精の受精卵の着床率(妊娠率)が上昇した。
また、1D RIM培養上清を添加したHTFメディウム群では、子宮内膜上皮細胞における着床関連遺伝子(Lif、FOXO1、Hoxa-10、Int3b)の発現上昇が確認され、子宮内膜上皮細胞の着床準備が促進されている可能性が示唆された。さらに、FOXO1の核内移行が認められたことから、脱落膜化を誘導していると考えられる。1D RIM培養上清は、子宮環境改善、受精卵の着床補助・着床率改善の効果を有することがわかった。1D RIM培養上清は、子宮環境改善剤、着床補助剤、胚移植液、精子移植液又は着床率改善剤に好適に用いられ得る。
本発明の子宮処理用組成物は、人工授精・体外受精(成功率や効率の向上)、家畜の繁殖(人工授精の成功率や効率の向上)、育種・種の維持(例えば絶滅危惧種の維持、ペットの系統の維持又は交雑)、子宮障害が主因又は副因の各種疾患(例えば、悪性腫瘍術後又は化学療法後の子宮障害)の治療・改善等に利用され得る。
Claims (4)
- 間葉系幹細胞培養上清を含む、子宮処理用組成物。
- 子宮環境改善剤、着床補助剤、胚移植液、精子移植液又は着床率改善剤として用いられる、請求項1に記載の子宮処理用組成物。
- 間葉系幹細胞が、脂肪組織由来、臍帯組織由来、又は骨髄組織由来である、請求項1又は2に記載の子宮処理用組成物。
- 間葉系幹細胞培養上清が、血清を含まない培地での間葉系幹細胞の培養から得られた間葉系幹細胞培養上清である、請求項1に記載の子宮処理用組成物。
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MIYAZAKI, KAORU; HARA, TOSHIO: "ERP Endometrial Regenerative Propagation Method", SANFUJINKA NO JISSAI - OBSTETRICAL AND GYNECOLOGICAL PRACTICE, KANEHARA SHUPPAN LTD., TOKYO, JP, vol. 69, no. 10, 1 October 2020 (2020-10-01), JP , pages 1081 - 1085, XP009555018, ISSN: 0558-4728, DOI: 10.18888/sp.0000001422 * |
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