摘要
目的观察正常人骨髓基质细胞对白血病敏感细胞株K562细胞凋亡易感性的影响,并研究其作用机制。方法建立正常人骨髓基质细胞的体外培养体系及其与K562细胞共培养的体系;流式细胞仪检测Annexin V阳性的早期凋亡细胞;电镜下观察凋亡形态学改变;流式细胞仪检测bcl-2,活化的胱冬氨酸蛋白酶(caspaae)-3的表达变化。结果与单独K562细胞培养相比,与正常人骨髓基质细胞共培养的K562细胞,分别经阿糖胞苷作用后,共培养体系下其凋亡率下降,电镜下细胞凋亡的形态改变减少或消失,而且bcl-2蛋白表达上调,活化的caspase-3表达减弱。结论正常人骨髓基质细胞可促进白血病细胞株K562细胞的增殖,降低K562细胞对阿糖胞苷的凋亡易感性,其作用机制中包括影响凋亡相关蛋白bcl-2和caspase-3的表达。
Objective To investigate the effects and mechanisms of the normal bone marrow stromal cells (BMSCs) on chemosensitivity of K562 cell line in vitro. Methods Culture system of BMSCs and co-culture system of K562 cells and BMSCs in vitro were established. Expressions of active caspase-3 and bcl-2 were detected by flow cytometry using Annexin V FIFC staining; morphological assessment of apoptosis was performed with transmission electron microscope. Results Compared with K562 cells treated by Ara-C without BMSCs, the percentage of Annexin V-positive cells, apoptotic ratio, apoptotic morphological changes, and the expression of active caspase-3 decreased while bcl-2 increased in K562 cells treated by Ara-C co-cultured with BMSCs. Conclusion Normal bone marrow stromal cells can promote the proliferation of K562 cells, prevent Ara-C-induced apoptosis in K562 cells via modulation of bcl-2 and active caspase-3.
出处
《兰州大学学报(医学版)》
CAS
2007年第2期1-4,9,共5页
Journal of Lanzhou University(Medical Sciences)