A method for large-scale induction of NK cell expansion in vitro

Abstract

The invention relates to a method for inducing NK cell expansion on a large scale in vitro, and belongs to the field of biotechnology. The present invention uses the constructed novel artificial antigen-presenting cells CD86CD64 mIL‑15‑aAPC as amplified feeder cells to directly amplify NK cells from peripheral blood lymphocytes, and the NK cells amplified by this method proliferate well and have high purity , Strong cytotoxicity, with obvious tumor cell killing effect. The invention solves the problems of limited cell expansion, low expression level of surface antigen CD3‑ / CD56+, and low cell killing activity faced by traditional culture methods, and can meet the clinical demand for NK cells.

Description

Technical field [0001] The present invention belongs to the field of biotechnology, particularly to a large-scale in vitro method for inducing NK cell expansion. Background technique [0002] Natural killer cells (natural killer cell, NK) mainly in the peripheral blood, accounting for PBMC5 ~ 10%. NK cells are important in the body's immune cells, and anti-tumor, anti-viral infection and immune regulation. In recent years, with the development of immunology and molecular biology, cell biology therapy has become the fourth mode of cancer treatment. At present, various studies have shown that NK cells have the ability without any antigen stimulation can be recognized and cleaved by the conversion of tumor cells, play an important role in tumor immunity. Although they can be quickly and directly attack the tumor defense cells, NK cells, but only a small part of the immune system, only 10% of the leukocytes. NK cells as an important component of the innate immune system of the body, ...

AI Technical Summary

Problems solved by technology

However, the expansion methods at home and abroad are different and cumbersome. Therefore, the acquisition of high-quality NK cells is still the key to restricting their clinical application. It is a huge task to generate a large number of NK cells that meet GMP (Good Manufacturing Practice) standards for the treatment of patients. challenge

[0004] CN 108251376 A discloses an artificial antigen-presenting cell and its construction method and its application in the expansion of chimeric antigen receptor T cells. However, research has found that the constructed artificial antigen-presenting cells cannot expand NK cells , and the artificial antigen-presenting cells are relatively complex and costly, and at the same time, the C expansion of D19-CAR T cells is slow

[0005] CN 108300693 A discloses a method for in vitro expansion of natural killer cells. The NK cells amplified by this method have poor antitumor activity, and only when NK cells:tumor target cells=10:1 can they produce good antitumor effects , not conducive to clinical application

At the same time, the study found that the expanded NK cells had poor tumoricidal activity under hypoxic conditions.

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