一氧化氮在人骨髓間充質(zhì)干細(xì)胞抑制淋巴細(xì)胞增殖中的機(jī)制研究
[Abstract]:A large number of experiments have proved that bone marrow mesenchymal stem cells (Mesenchymal Stem) can inhibit the proliferation and response of T cells. Moreover, in the practice of allogeneic hematopoietic stem cells combined with MSC transplantation in the treatment of malignant hematological diseases, bone marrow mesenchymal stem cells can promote graft implantation and promote hematopoietic recovery. To inhibit the occurrence of graft-versus host disease (GVHD) and to reduce the incidence and severity of GVHD. At present, there are many reports about MSCs regulating immunity, especially the effect of MSCs on lymphocyte inhibition, but the mechanism of MSCs immunosuppression is still unclear. It has been reported that mouse MSC inhibits T cell proliferation by producing nitric oxide (no) mediated by nitric oxide (no). The inhibition of T cell proliferation by no may be achieved by affecting the phosphorylation of STAT5 tyrosine protein kinase in JaK3/STAT5 signal transduction pathway. And does no play a role in the Mixedlymphocyte reaction of Mixedlymphocyte reactionation in which allogeneic lymphocytes act as stimulus factors in the process of inhibiting the proliferation of peripheral blood lymphocytes by human MSCs (hMSCs)? Based on this, we isolated and cultured hMSCs and established MLRs with allogeneic lymphocytes as stimulus factors to investigate the production of no in the reaction system and its role in the effects of hMSC on lymphocyte proliferation, apoptosis and lymphocyte FOXP3 mRNA expression. Bone marrow suspension was prepared from healthy volunteers by sterile extraction. Bone marrow-derived mesenchymal stem cells were isolated by whole bone marrow adherent culture method. The MSCs were subcultured after P4/P5 digestion. Peripheral blood T lymphocytes were used as reaction cells, Mitomycin C inactivated allogeneic lymphocytes were used as stimulators to establish a mixed lymphocyte culture system (MLR). MSC-MLR) in which the ratio of MSC to reactive T lymphocytes was 1: 10. In the presence or absence of inducible nitric oxide synthase (iNOS) inhibitor (L-NAME), the ratio of MSC to reactive T lymphocytes was 1: 10. The content of no in supernatant of MLR system was detected by CCK-8 method, and the expression of FOXP3mRNA in MLR system was detected by real-time PCR and flow cytometry. The results showed that 1 hMSC could inhibit the reactive proliferation of lymphocytes, and the OD value of lymphocyte proliferation activity was 0.49 鹵0.03. After the addition of L-NAME, the OD value was 0.49 鹵0.03. The ratio of apoptosis in co-culture system was (20.83 鹵1.69) under the intervention of 0.92 鹵0.03.2 hMSC. After the addition of L-NAME, the percentage of lymphocyte apoptosis was (9.56 鹵0.96) in the reaction system. Compared with the hMSC intervention group, the expression of Foxp3 mRNA in the co-cultured system was significantly higher than that in the control group (0.74 鹵0.15)% and (1.56 鹵0.34)%, compared with that in the hMSC intervention group (P < 0. 05). There was significant difference (P < 0. 05). The expression level of Foxp3 mRNA was (0. 81 鹵0. 18) after adding L-NAME. It is concluded that no plays an important role in the inhibition of lymphocyte proliferation induced by allogeneic antigens by hMSC. The mechanism may be to promote apoptosis, affect the expression of FOXP3 and thus affect the function of regulatory T cells.
【學(xué)位授予單位】:南方醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2008
【分類號(hào)】:R457;R392
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