人脂肪间充质干细胞与再生障碍性贫血患者T淋巴细胞的体外共培养

摘要

背景：目前已有临床应用造血干细胞联合间充质干细胞输注治疗再生障碍性贫血的报道。目的：观察人脂肪间充质干细胞对再生障碍性贫血T淋巴细胞分泌功能的调节作用。　　方法：从健康人脂肪中提取并培养人脂肪间充质干细胞，从再生障碍性贫血患者外周血中分离T淋巴细胞，将两者共培养后，以健康志愿者的T淋巴细胞单独培养及与人脂肪间充质干细胞共培养做对照。ELISA法检测上清白细胞介素2、白细胞介素4、白细胞介素10和γ-干扰素的水平，Realtime RCR和Western blot测定T-bet和GATA-3的表达。　　结果与结论：共培养7 d后，间充质干细胞+再生障碍性贫血T淋巴细胞组Th1类细胞因子γ-干扰素、白细胞介素2水平明显低于再生障碍性贫血T淋巴细胞组(P<0.05)，Th2类细胞因子白细胞介素4、白细胞介素10水平明显高于再生障碍性贫血T淋巴细胞组(P<0.05)；间充质干细胞+再生障碍性贫血 T淋巴细胞组T-bet mRNA及蛋白表达水平均低于再生障碍性贫血T淋巴细胞组，GATA-3 mRNA及蛋白水平均高于再生障碍性贫血 T淋巴细胞组。提示人脂肪间充质干细胞在体外对再生障碍性贫血患者T淋巴细胞具有免疫调节作用，其机制可能是通过调节转录因子T-bet和GATA-3的表达从而抑制Th细胞向Th1细胞方向分化。%BACKGROUND:Clinical infusion of hematopoietic stem cells and mesenchymal stem cells for treatment of aplastic anemia has been reported. OBJECTIVE:To investigate the effect of human adipose-derived mesenchymal stems cells on the secretion function of T lymphocytes of aplastic anemia patients. METHODS:Human adipose-derived mesenchymal stems cells were extracted from healthy human adipose tissues. T-lymphocytes were harvested from peripheral blood of patients with aplastic anemia by density gradient centrifugation. Human adipose-derived mesenchymal stems cells were co-cultured with T-lymphocytes. The levels of interleukin-2, interleukin-4, interleukin-10 and interferon-γwere detected by enzyme linked immunosorbent assay. T-bet and GATA-3 levels were examined by real-time PCR and western blot. RESULTS AND CONCLUSION:The levels of Th1 type cytokines interferon-γand interleukin-2 in the co-culture group were significantly lower than those in the T-lymphocyte group (P<0.05). But the levels of Th2 type cytokines interleukin-4 and interleukin-10 in the co-culture group were significantly higher than those in the T-lymphocyte group (P<0.05). The T-bet mRNA and protein levels in the co-culture group were significantly lower than those in the T-lymphocyte group, while the GATA-3 mRNA and protein levels were significantly higher in the co-culture group. Human adipose-derived mesenchymal stems cells can mediate an immunoregulation effect on T-lymphocytes of aplastic anemia patients in vitro, which is possibly related with the inhibition of Th1-dominant response due to the disorder of T-bet and GATA-3 gene expression.