43 results about "Muscle stem cell" patented technology

Disclosed herein are hydrogels that can be loaded with myogenic agents, for instance muscle stem cells (MuSCs) / satellite cells, pro-myogenic factors, and combinations thereof. The hydrogels can be contacted with damaged muscle tissue, thereby facilitating muscle growth and repair. Further provided are methods of repairing muscle tissue in a patient in need thereof, said methods comprising contacting the muscle tissue with a composition comprising the hydrogel. Also provided herein are kits comprising the hydrogel composition and a substrate comprising at least one microneedle.

This invention discloses the application of the Six2 gene in promoting the reprogramming of fibroblasts into muscle stem cells, belonging to the field of biotechnology. The nucleotide sequence of the Six2 gene is shown in SEQ ID NO.1, and the fibroblasts are chicken fibroblasts. This invention uses chicken embryonic fibroblasts as the reprogramming target, and induces the reprogramming of chicken embryonic fibroblasts into muscle stem cells by overexpressing the Six2 gene, promoting the expression of stem cell-related genes MyoD, MyoG, Myf5, and Pax7. The circ_TCONS / gga-miR181-5p / Six2 regulatory network participates in the reprogramming process; it improves the efficiency of somatic cell reprogramming into stem cells, greatly promotes the application of reprogramming, and provides a new approach for the sustainable acquisition of muscle stem cells.

The present invention relates to: a cultured meat medium additive and a cultured meat medium composition that can induce muscle growth by differentiating muscle stem cells into muscle cells and inhibiting the expression of myostatin, which inhibits muscle growth; and a method for preparing cultured meat by using same. Specifically, the cultured meat medium additive and the cultured meat medium composition comprise laxogenin and 5-alpha hydroxy laxogenin.

The application discloses a kind of construction method and application of seawater fish muscle stem cell line, culture medium with basic medium as background medium;Culture medium includes LIF growth factor, EGF growth factor and leopard bristletooth-derived FGF2 protein;The final concentration of leopard bristletooth-derived FGF2 protein is 20~30 ng / mL, 30~45 ng / mL, 45~55 ng / mL or 55~70 ng / mL. Through the medium, immortalized seawater fish muscle stem cell line with good stability, cell division vigorous, short subculture time can be constructed, and can be stably subcultured for more than 50 generations. It provides raw materials for exploring the function of myoblasts, gene regulation mechanism, and provides the prerequisite for in vitro verification experiment for further exploring the influence of seawater fish muscle stem cells on growth rate, and lays a foundation for good strain breeding of seawater fish.

The invention relates to a living plant cell-animal cell composite scaffold as well as a preparation method and application thereof. The living plant cell-animal cell composite scaffold comprises a 3D printing hydrogel scaffold used as a muscle repair carrier and a 3D printing biological ceramic scaffold used as a bone repair carrier, wherein the 3D printing hydrogel scaffold and the 3D printing biological ceramic scaffold are assembled by simulating a muscle-skeleton structure; the hydrogel scaffold comprises a polymer matrix component, and functional plant cell components, namely diatom cells and mammalian cell components, namely muscle stem cells, which are distributed in the polymer matrix component, the biological ceramic scaffold comprises a biological ceramic scaffold matrix component and mammalian cell component bone marrow mesenchymal stem cells inoculated and loaded on the biological ceramic scaffold matrix component.

The application discloses application of a polysaccharide wrapping film in preparation of a cell culture product and belongs to the technical field of cell culture food. The application specifically forms the polysaccharide wrapping film on the periphery of a cell inoculation support after the cell inoculation support, can relieve the phenomenon that cells fall off from the support during culture, and further guarantees effective proliferation and differentiation of muscle stem cells and / or fat stem cells on the support, thereby providing a new solution approach for efficient and standardized production of the cell culture product.

The present invention provides: a serum replacement composition for cell culture, comprising an extract of Chlorella protothecoides; and a method for culturing cells, such as muscle stem cells, using the composition.

This application discloses a muscle stem cell resuscitation and protection washing solution, a quality assessment kit, and a method of use, belonging to the field of cell biology technology. In this application, vitamin E succinate and mannan peptide are used as core antioxidant components, synergistically combined with Gynostemma pentaphyllum polysaccharide, Portulaca oleracea polysaccharide, trehalose, L-proline, and magnesium sulfate heptahydrate to construct a four-in-one resuscitation and protection washing solution that provides isotonic buffering, extracellular protection, intracellular protein stabilization, antioxidant effects, and mitochondrial stabilization. This increases the survival rate of muscle stem cells after resuscitation to over 93%. The kit integrates a multi-dimensional detection system for cell resuscitation and protection washing solution, cell viability, proliferation rate, Pax7 / MyoD double-positive stemness assessment, and cryopreservation damage, achieving closed-loop management of the entire process of muscle stem cell resuscitation, protection, and quality assessment. The double-positive rate of stemness markers reaches over 90%, providing reliable quality assurance for cell bank management and clinical applications.

The present invention relates to a composition for promoting differentiation of muscle stem cells into myotubes, comprising a compound that promotes lipid metabolism or cell differentiation, for example, ethanolamine or a functional equivalent thereof, and to a method for differentiating muscle stem cells using same. More specifically, the present invention provides a composition for promoting differentiation of muscle stem cells into myotubes, comprising only ethanolamine, a composition for a muscle stem cell culture medium comprising same, a method for differentiating muscle stem cells into myotubes, using the composition for promoting differentiation or the composition for a culture medium, a myotube culture obtained by the differentiation method, and a cultured meat and food composition comprising same.

This invention discloses a method for constructing and applying a marine fish muscle stem cell line. The culture medium uses basal medium as the background medium and contains LIF growth factor, EGF growth factor, and FGF2 protein derived from the leopard-gill sea bass. The final concentration of FGF2 protein from the leopard-gill sea bass is 20-30 ng / mL, 30-45 ng / mL, 45-55 ng / mL, or 55-70 ng / mL. Passaging using this medium can construct a stable, rapidly dividing, and short-passaging immortalized marine fish muscle stem cell line, capable of stable passage for more than 50 generations. This provides raw materials for exploring the function and gene regulation mechanisms of myoblasts, and provides in vitro verification experimental conditions for further research on the effects of marine fish muscle stem cells on growth rate, laying the foundation for the breeding of superior marine fish species.

Disclosed are methods of in situ genomic modification of cells (e.g., stem cells, tissue stem cells, muscle stem cells, Sca-1+ mesenchymal progenitor cells in skeletal muscle, CD140a+ dermal mesenchymal cells) using sequence-targeting nucleases delivered via a virus (e.g., an AAV).

Disclosed are methods of in situ genomic modification of cells (e.g., stem cells, tissue stem cells, muscle stem cells, Sca-1+ mesenchymal progenitor cells in skeletal muscle, CD140a+ dermal mesenchymal cells) using sequence-targeting nucleases delivered via a virus (e.g., an AAV).

The application provides a skeletal muscle organoid and a preparation method thereof, takes muscle stem cells, neural stem cells and fibroblasts as primary cells for organoid culture, restores the microenvironment of skeletal muscle as much as possible, and improves the differentiation degree of the organoid; further, the mold and frame for constructing the organoid are improved, the batch production of the organoid is realized through the array design of the PDMS mold and the polyamide frame; finally, the calcium signal video of the organoid is analyzed by using the Organblink system independently developed by the application, and the accuracy of the function evaluation result of the organoid is improved. The method provided by the application realizes the high bionics and high batch production of the skeletal muscle organoid, has low cost, and greatly promotes the development of the medical research field.

A composition of INFRA cells is described. The composition includes human muscle stem cells (SCs) expressing the transcription factor PAX7 and lacking the expression of the transmembrane receptor PDGFRA, wherein at least 70% of the population of human muscle SCs are PAX7+ and PDGFRA-. Methods of preparing the INFRA cell compositions, and methods of using the INFRA cells to treat muscle injury are also described.

The invention discloses application of a Six2 gene in promoting reprogramming of fibroblasts into muscle stem cells, and belongs to the technical field of biology. The nucleotide sequence of the Six2 gene is as shown in SEQ ID NO.1, and the fibroblast is a chicken fibroblast. Chicken embryo fibroblasts are adopted as reprogramming objects, the chicken embryo fibroblasts are induced to be reprogrammed into muscle stem cells in a mode of overexpression of Six2 genes, expression of stem cell related genes MyoD, MyoG, Myf5 and Pax7 is promoted, and a circTCONS / gga-miR181-5p / Six2 regulatory network participates in the reprogramming process; the efficiency of reprogramming the somatic cells into the stem cells is improved, the application of reprogramming is greatly promoted, and a new way is provided for continuously obtaining the muscle stem cells.

The present disclosure provides, inter alia, compositions and methods for treating premature aging of muscle stem cells to combat myopathy by targeting Cdkn2a.

The invention belongs to the technical field of exosome biological medicines, and particularly relates to a preparation method and application of a drug-loaded muscle fiber exosome for improving sarcopenia of a pet dog. The method is realized by the following steps: firstly, separating and culturing high-activity muscle stem cells: culturing and amplifying the high-activity muscle stem cells; then culturing, amplifying and differentiating the cultured primary muscle stem cells (MPCs) to form muscle fiber cells; the differentiated muscle fiber cells are loaded with SR12343 in several times, and the drug-loaded muscle fiber exosome is obtained. The muscle fiber exosome prepared by the invention contains specific bioactive factors of muscle functional cells, and can effectively improve the activity of an NF-kB signal channel for inhibiting mediating cell senescence and promote the activation and regeneration of senescent muscle cells in vivo under the action of cooperating with SR12343.

Provided is a method for loading a muscle stem cell exosome with a Notch activator and a senolytic drug, fisetin, that is capable of targeting and killing senescent cells, and further with lutein that has an eye protection effect, such that senescent muscle cells can be eliminated while the regeneration of muscle stem cells is promoted. By means of high-activity stem cell separation and culture technology, combined with exosome large-scale preparation and separation technology, simple and low-cost exosome drug-loading technology, senescent cell targeted clearance technology, etc., the present invention effectively helps to ameliorate the problems of extraocular muscle aging and atrophy, and can be widely applied to the damage repair of various muscle tissues. The present invention provides a new option for ameliorating the symptom of degeneration of extraocular muscle function, and has outstanding advantages in terms of safety, biocompatibility, and effectiveness.

The application discloses a primer set for real-time fluorescent quantitative PCR detection of a pig muscle regulatory factor and application thereof, and belongs to the technical field of biology. The application provides specific primer pairs capable of detecting pig muscle regulatory factors MyoD and MyoG and reference primer pairs. cDNA is obtained by extracting sample RNA and performing reverse transcription, and real-time fluorescent PCR is performed by using the provided primers, so that the mRNA expression amount of the pig muscle regulatory factors MyoD and MyoG can be simultaneously detected quickly, specifically, sensitively and stably, and the application can be used for detecting the change in the expression level of the regulatory factors before and after the differentiation of pig muscle stem cells, so that the differentiation condition of pig breeding meat can be judged.

This invention relates to the field of bioengineering technology, specifically to an extracellular vesicle from kelp, its preparation method, and its applications. This invention provides a method for efficiently isolating extracellular vesicles with specific biological activities from kelp, and an application scheme for these vesicles to promote the proliferation, migration, and maintenance of stemness of large yellow croaker muscle stem cells under low serum conditions. This overcomes the problems of high cost and limited functionality of fetal bovine serum as a substitute in existing cell-cultured meat technologies, providing a novel culture medium supplement component that is stable in origin, low in cost, and has a clear effect.

A composition contains Nicotinamide and Vitamin B6, for example pyridoxine. The composition may be an oral nutritional composition, for example an infant formula, a follow up formula, a nutritional supplement, an oral nutritional supplement, a food product. The composition can be administered to an individual in need thereof for promoting muscle growth and / or for maintaining and / or increasing muscle function and / or muscle mass in infants and children. For example, the composition can be useful for increasing muscle function and / or muscle mass by modulating muscle stem cells.

The invention discloses a porcine serum culture medium and application thereof in porcine muscle stem cell culture, and belongs to the technical field of animal cell culture. The porcine serum culture medium comprises a basic culture medium, porcine serum and additive factors, wherein the volume percentage of the pig serum is 10-20%, and the additive factor comprises at least one of the following components: a chick embryo culture with the volume percentage of 0.3-0.7%, glutamine with the volume percentage of 0.8-1.2%, non-essential amino acid with the volume percentage of 0.8-1.2%, and a fibroblast growth factor-2 with the mass concentration of 2.3-2.7 ng / mL. According to the porcine serum culture medium provided by the invention, by adding the porcine serum, the cost can be remarkably reduced, and meanwhile, the multiplication capacity of cells can also be improved; in addition, cell proliferation can be further promoted by adding additive factors; therefore, the porcine serum culture medium has a relatively good application prospect in culture of porcine muscle stem cells.

The invention discloses an application of PDGF-C (Platelet Derived Growth Factor-C) in muscle injury repair. Research finds that in a CTX model mouse with Pdgf-c knocked out, the number of proliferated muscle satellite cells (Pax7 + Ki67 +) is remarkably smaller than that of wild type mice. Through AAV-mediated PDGF-C overexpression, the number of CTX model mouse muscle stem cells can be significantly increased, the activation level of the muscle stem cells is improved, and the self-renewal ability of the muscle stem cells is enhanced. In addition, PDGF-C overexpression also significantly increases the area of muscle fibers of CTX model mice and improves the regeneration and repair ability of the muscle fibers, thereby promoting the healing of muscle injury and having a therapeutic effect on the disease. In addition, the effect of the PDGF-C on promoting muscle injury repair is obviously higher than that of the PDGF-B. Therefore, the invention provides a new method for the treatment of muscle injury, and a new way is possibly opened up for the treatment of other muscle-related diseases.

This invention discloses the application of PDGF-C in muscle injury repair. The study found that in CTX model mice with PDGF-C knockout, the proliferation of muscle satellite cells (Pax7)... + Ki67 + The number of muscle stem cells in CTX model mice was significantly lower than that in wild-type mice. AAV-mediated PDGF-C overexpression significantly increased the number of muscle stem cells, improved their activation level, and enhanced their self-renewal capacity. Furthermore, PDGF-C overexpression significantly increased the surface area of ​​muscle fibers in CTX model mice, enhancing their regenerative and repair capabilities, thereby promoting muscle injury healing and demonstrating a therapeutic effect on this disease. Moreover, PDGF-C's effect on promoting muscle injury repair was significantly higher than that of PDGF-B. Therefore, this invention provides a new method for treating muscle injuries and may open new avenues for the treatment of other muscle-related diseases.

The invention provides a low-cost, safe and serum-free culture medium for in-vitro efficient suspension culture of porcine muscle stem cells and application of the serum-free culture medium. Comprising cell culture supplementary factors and a basic culture medium, the cell culture supplementary factors comprise zinc sulfate, L-ascorbic acid, bFGF, IGF-1, LIF, EGF, cortisol, HGF, alpha-tocopherol, PVA, beta-cyclodextrin, methyl cellulose and a yeast extract. The efficient suspension amplification of the porcine muscle stem cells under serum-free and carrier-free conditions is realized by adding factors in a simplified and optimized manner and adding cell culture supplementary factors with specific types and concentrations. According to the culture medium disclosed by the invention, the addition cost of exogenous factors is remarkably reduced, various potential risk substances are avoided, the food safety and economy of the culture medium are improved while efficient growth of cells is ensured and the process is simplified, and an important technical and raw material basis is provided for industrial production of cell culture meat.

The present invention discloses the application of NSUN2 in muscle injury repair. The present invention found that AAV-mediated NSUN2 overexpression can significantly increase the number of activated muscle stem cells in CTX model mice and promote muscle stem cell proliferation. NSUN2 overexpression not only increases the activation level of muscle stem cells but also enhances the self-renewal ability of muscle stem cells. Furthermore, NSUN2 overexpression also significantly increases the area of ​​muscle fibers in CTX model mice and reduces muscle atrophy weight. NSUN2 overexpression promotes the healing of muscle damage by promoting the proliferation and activation of muscle stem cells, promoting muscle fiber repair and muscle mass recovery, and thus has a therapeutic effect on this disease. Therefore, the present invention provides a new method for the treatment of muscle damage and may also open up new avenues for the treatment of other muscle-related diseases.

This invention discloses the application of the USP28 gene in the proliferation of porcine muscle stem cells, belonging to the field of animal genetic engineering. Resequencing data shows that this gene is selected in pig breeds with high meat production traits. Functional verification indicates that knocking down this gene in primary porcine muscle stem cells significantly reduces the mRNA expression level of the proliferation marker gene and significantly decreases the number of EdU-labeled proliferative positive cells. This invention clarifies the proliferation-promoting function of the USP28 gene, which can be used as a molecular marker or target gene for pork quality improvement and new breed breeding, providing an effective technical means to solve the problems of insufficient pork yield and genetic improvement of quality traits.

The application belongs to the field of cell culture, and discloses a bovine muscle stem cell in-vitro separation and culture method, a culture medium and application thereof. The muscle stem cell in-vitro culture method of the application is to culture muscle stem cells by using a cell culture medium of non-animal source hydrolysate. The application further discloses a culture medium for culturing the muscle stem cells. By using the culture medium of the application, muscle stem cells with ideal cell quantity and cell morphology can be obtained on the basis of no or less serum addition, and the muscle stem cells can still maintain stemness and differentiation potential after continuous passage for multiple times. The application utilizes the in-vitro cultured muscle stem cells for the field of cell culture meat, and has a wide application prospect.

The application discloses application of a TP53INP2 gene in regulation of intramuscular fat deposition of pigs. Through overexpression experiments, the application can significantly promote adipogenic differentiation of pig muscle stem cells by improving the expression level of TP53INP2, and the effect of lipid droplet deposition is clear, the effect is more significant than that of a conventional nutritional regulation method, and the application has repeatability and stability, can realize precise and efficient regulation of intramuscular fat deposition, and provides a genetic regulation method for breeding high-quality pigs with high intramuscular fat content.

The present invention relates to an invention utilizing a microalgae extract as a medium additive for culturing cultured meat. More specifically, the present invention uses an extract of chlorella, which is a kind of microalgae, as a medium additive component, thereby making it possible to effectively induce cross-differentiation from muscle stem cells into adipocytes and provide cultured meat having improved flavor by inducing cells in which muscle fat is present at the same time. In addition, the use of the medium additive of the present invention replaces fetal bovine serum, which is a culture medium component for cultured meat, or is used in combination with fetal bovine serum, thereby enabling a reduction in the use of expensive fetal bovine serum and enhancing the culture effect of cultured meat, thus providing cultured meat having excellent cost effectiveness.