32results about How to "Enhance in vitro proliferative ability" patented technology

The invention relates to a skin renewal method. According to the skin renewal method, hair follicle stem cells are used as seed cells and silica gel dressing is used as a new cell transplantation carrier. The skin renewal method comprises the following steps: 1) cultivating and amplifying hair follicle stem cells; 2) cultivating dermal cells; 3) mixing the hair follicle stem cells cultivated and amplified in the step 1) and the dermal cells cultivated in the step 2); 4) dropwise adding mixed cells obtained in the step 3) into silica gel dressing for incubation; and 5) transplanting the cells and the silica gel dressing used in the step 4) to a part required to be subjected to skin renewal. The method provided by the invention not only can renew functional skin in the treatment of large-area skin injuries, but also can provide a simple validation method for the multipotency test on hair follicle stem cells in scientific research activities.

The invention provides a fourth-generation CAR-T cell and an application thereof. The fourth-generation CAR-T cell expresses a chimeric antigen receptor specifically binding to an antigen, a secretoryIL-7 and an NFAT regulatory CCL19,wherein the signal peptide of the IL-7 is an IL-10 signal peptide; and a promoter of the CCL19 is an NFAT regulatory promoter. According to the invention, the original signal peptide of the IL-7 is changed into the signal peptide of T cell secretory protein IL-10, and the NFAT regulatory promoter is adopted as the promoter of CCL19, so that the CAR-T cell can secrete the IL-7 to the outside of the cell and conditionally express the CCL19, the proliferation of the CAR-T cell is promoted, immune cells are recruited to the inside of tumors to the greatest extent, and the anti-tumor efficacy of the CAR-T is obviously improved.

The invention discloses a method for preparing an isolated hair follicle in a process of treating scar by hair follicle stem cell transplantation. The method comprises the following steps: extractionof hair follicles, separation of the hair follicles, completely separating the hair follicle units into single hair follicles under an electron microscope, and keeping the extracted skin appendages such as sebaceous glands, sweat glands and the like as far as possible; for scars in a smooth hairless area, removing lower 1/3 of hair papilla, so that the hair follicle could not enter the next growthcycle, and no final hair grows in the scar area; in vitro culture of the hair follicles, putting the isolated single hair follicle into a special culture solution for culturing for later use; planting the hair follicle stem cells in a specific area of the scar on the basis of hair follicles. According to the method, through a hair follicle in-vitro culture technology, the single hair follicle isseparated and inactivated by adopting a separation method different from a hair transplantation operation, and is cultured in the special culture solution, so that growth and proliferation of hair follicle stem cells are facilitated. The method can achieve purposes of inhibiting scar hyperplasia, softening and repairing scars, and removing and beautifying scars.

The invention relates to the field of protein, in particular to bioactive polypeptide LPYPYYA as well as a preparation method and application thereof. The amino acid sequence of the bioactive polypeptide LPYPYYA is Leu-Pro-Tyr-Pro-Tyr-Tyr-Ala. In vitro immune function regulation experiments and in vivo anti-aging experiments prove that the polypeptide LPYPYYA has better immune regulation functionand anti-aging activity; on one hand, the bioactive polypeptide LPYPYYA can enhance the in vitro multiplication capacity of lymphocytes and macrophages, improve the capability of the body for resisting external pathogen infection and reduce the disease incidence of the body; on the other hand, the activity of an in vivo antiperoxidase system can be improved; the function of the body for resistingthe exogenous irritation is enhanced, so that the body aging, senility and sickness probability is reduced; very important significance is realized on developing food, health products and medicines with the immune regulation function and the anti-aging function.

The invention provides a construction method for a hepatic progenitor cell-like cell bank. The method includes the following steps: performing transformation culture on human primary hepatocyte cultures derived from different donors, performing cryopreservation treatment, performing propagation culture, performing primary passage treatment, performing virus infection, performing secondary passagetreatment, performing continuous screening culture and performing continuous passage culture. According to the construction method for the heterogeneous immortal hepatic progenitor cell-like cell bankprovided by the invention, the human primary hepatocyte cultures derived from the donors are firstly subjected to transformation culture before proliferation culture, so that the method is beneficialto giving good proliferation performance to the human primary hepatocyte cultures, and culture parameters are controlled in the subsequent stage, so that obtained immortal hepatic progenitor cell-like cell lines derived from the different donors have good in-vitro proliferation ability. The invention also provides an application of the liver progenitor cell-like cell bank and the cell lines obtained by the construction method.

The invention relates to the field of protein, in particular to a bioactive peptide KQSLPPGLAVKDLK as well as a preparation method and application thereof, and the amino acid sequence of the bioactivepeptide KQSLPPGLAVKDLK is Lys-Gln-Ser-Leu-Pro-Pro-Gly-Leu-Ala-Val-Lys-Asp-Leu-Lys. In-vitro immune function regulation experiments prove that the bioactive peptide KQSLPPGLAVKDLK has a very good immune regulation function. The bioactive peptide KQSLPPGLAVKDLK disclosed by the invention has the effects of enhancing the in-vitro proliferation capability of macrophages and lymphocytes, improving thecapability of resisting external pathogen infection of an organism, reducing the morbidity of the organism and improving the quality of life, and has very important significance for developing foods,health care products and medicines with an immunoregulation function.

The invention relates to application of m6A demethylase FTO in inhibition of NPM1 mutant leukemia cell proliferation, and belongs to the technical field of biomedical research. The technical problem to be solved by the invention is to provide a new molecular target for treating NPM1 mutant leukemia. The expression level of FTO in NPM1 mutant leukemia is higher than that of non-NPM1 mutant leukemia, and high expression of FTO is related to poor prognosis of a patient; the shRNA lentiviral vector or drug meclofenac sodium is utilized to target FTO, and the growth capacity of leukemia cells can be effectively inhibited. The m6A demethylase FTO is expected to become a novel molecular treatment target and a clinical prognosis index of the NPM1 mutant leukemia.