IL-15对MDS患者CD34+细胞诱导增殖分化和抗凋亡作用

为了研究IL—15对体外培养的MDS CD34^＋细胞诱导增殖分化及凋亡的抑制作用，应用MACS免疫磁珠分离系统分离高富集度MDS CD34^＋细胞，建立以造血生长因子为基础的体外培养体系，用不同浓度的IL-15作用于MDS CD34^＋细胞，采用流式细胞术检测和免疫细胞化学染色等方法观察培养后的细胞表面抗原表达、细胞周期、凋亡指数及细胞形态的变化情况，并进行了定量分析。结果表明，MDS CD34^＋细胞经IL—15作用后，MDS CD34^＋细胞出现明显增殖和分化，细胞周期变异，增殖指数和细胞计数增加，形态学向成熟转化，实验组各表面抗原水平CD71、CD33和CD19均较对照组为高，细胞凋亡率则较对照组下降。结论IL—15对MDS CD34^＋细胞有一定的诱导增殖分化和抗凋亡作用，在MDS治疗方面可能有一定的应用前景。

Effect of IL-15 on the Proliferation, Differentiation and Antiapoptosis of CD34 + Cells in Patients with MDS

To study the effect of interleukin-15 (IL-15) on the proliferation, differentiation and apoptosis of MDS CD34~ cells, CD34~ cells of high enrichment were separated by MACS system, and cultured in liquid media with different concentration of IL-15 in treated group and without IL-15 in the control group. Apoptosis of hematopoietic precursors was assayed by propidium iodine staining and cell by FCM, and the other MDS CD34~ cells were stained by cytochemical staining after culture. The results showed that after culture with IL-15 the proliferation and differentiation of MDS CD34~ cells were obviously promoted. It was found the every lineage of mature cells developed, the expressions of cell surface antigens CD71, CD33 and CD19 all increased in the MDS CD34~ cell treated with IL-15. It is suggested that IL-15 stimulates the proliferation and differentiation of MDS CD34~ cells, and partly shows anti-apoptosis effects which may be applicable to the therapy MDS.