Method for promoting cartilage tissue differentiation of mesenchymal stem cells

Abstract

The invention discloses a method for promoting cartilage tissue differentiation of mesenchymal stem cells. The method comprises the following steps: separating the human mesenchymal stem cells; then, implementing stable over-expression of NR2F2 genes in the mesenchymal stem cells by virtue of lentivirus and down-regulating the expression of the NR2F2 genes by virtue of a small RNA interference technology; cultivating 3D cell microspheres after the over-expression of the NR2F2 genes in the mesenchymal stem cells and down-regulating the expression; mixing the human mesenchymal stem cells, polyethylene glycol dimethacrylate, acrylate peptide, a 2959 photoinitiator and PBS (phosphate buffered saline), so that biological ink is prepared; printing 3D hydrogel cartilage tissues, which achieve the over-expression of the NR2F2 genes, on biological printing paper by virtue of a biological printer; and cultivating the 3D hydrogel cartilage tissues subcutaneously into a mouse by virtue of a cartilage forming medium for 21d, so that joint cartilage tissues are formed. The method provided by the invention is simple and convenient to operate and is strong in repeatability; and the method can effectively promote the cartilage tissue differentiation of the mesenchymal stem cells, so that beneficial reference is provided for the scientific researches of cartilage tissue engineering and the clinical treatment of cartilage injuries.

Description

technical field [0001] The invention belongs to the technical fields of biology and tissue engineering, and in particular relates to a method for promoting cartilage tissue differentiation of mesenchymal stem cells. Background technique [0002] In order to maintain the precise printing resolution of 3D printing, the density of cells seeded in bio-ink should not be too high, however, high-density cells are a necessary condition for tissue engineering mesenchymal stem cells to generate extracellular matrix. Mesenchymal stem cells are precursor cells with multiple functions. They have the ability to differentiate into cartilage, osteogenesis and fat, and can secrete a variety of cytokines, which play an important role in regulating cell apoptosis, differentiation and immune response. Mesenchymal stem cells are easy to isolate and collect, and are widely used in the bioprinting process. However, the excessive proliferation of mesenchymal stem cells in the process of chondrogen...

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Problems solved by technology

However, the excessive proliferation of mesenchymal stem cells in the process of chondrogenic differentiation is still an insurmountable problem

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