正常人骨髓基质细胞对HL-60和HL-60/VCR细胞凋亡易感性的影响  

Effect of Bone Marrow Stromal Cells on the Apoptotic Sensitivity of HL-60 and HL-60/VCR Cells

作　　者：梁蓉[1] 黄高昇 王哲 陈协群[1] 白庆咸[1] 张伟平 王娟红 王文清 郭英 

机构地区：[1]第四军医大学西京医院血液科 [2]基础部病理教研室,西安710032

出　　处：《中国实验血液学杂志》2005年第2期286-292,共7页Journal of Experimental Hematology

基　　金：国家自然科学基金资助项目(编号30300141)

摘　　要：为了观察正常人骨髓成纤维样基质细胞系HFCL对白血病敏感细胞HL-60和多药耐药细胞HL-60／VCR 凋亡易感性的影响,先建立HL-60或HL-60／VCR细胞与HFCL细胞共培养体系;采用瑞氏-吉姆萨染色和吖啶橙／ 溴化乙啶(AO／EB)染色,分别在光镜和荧光显微镜下进行形态学观察;TUNEL检测晚期凋亡细胞,流式细胞术检 测细胞周期、凋亡峰和annexin V阳性的早期凋亡细胞;Western blot检测Bcl-2、活化的胱冬蛋白酶(caspase)-3蛋 白和P糖蛋白(Pgp)的表达变化。结果表明,经topotecan(TPT)处理后的HL-60和HL-60／VCR细胞,在光镜和荧光 显微镜下均有典型的凋亡细胞形态学改变,这些改变具有时间和剂量依赖性;annexin V染色后能检测到早期凋亡 细胞;细胞周期显示:G1期细胞比例增高,S期减低,并有明显凋亡峰;TUNEL能检测到许多阳性细胞;同时出现活 化的caspase-3,伴有Bcl-2的表达下调,但与HFCL细胞共培养后,经TPT处理的HL-60和HL-60／VCR细胞中早期 和晚期凋亡细胞有所减少,凋亡峰减低,而且活化的Caspase-3表达减弱,Bcl-2蛋白表达上调,且以直接接触组为 甚。结论:正常骨髓成纤维样基质细胞HFCL能轻度降低白血病HL-60和HL-60／VCR细胞对TPT的凋亡易感性, 并有caspase-3和Bcl-2重要信号传导分子的参与。This study was aimed to investigate the effects of human bone marrow fibroblastoid stromal cell line (HFCL) on chemosensitivity of acute myeloid leukemia sensitive HL-60 cell line and multidrug-resistant (MDR) HL-60/VCR cell line in vitro co-culture. Setting up co-culture system of HL-60 or HL-60/VCR cells in direct contact with HFCL cells, or with HFCL cells separated by transwell, and exposing HL-60 or HL-60/VCR cells to different concentrations of topotecon (TPT), morphologic evidence for apoptosis was determined by staining with Wright-Giemsa stain and acridine orange/ethidium bromide (AO/EB) . Cell cycle, sub-G1 and annexin V FITC staining were detected by flow cytometry. The expression of active caspase-3, Bcl-2 and Pgp was detected by Western blot. The results showed that HL-60 or HL-60/VCR cells treated by TPT revealed characteristic apoptotic morphological changes by Wright-Giemsa and AO/EB staining. The percentage of annexin V-positive cells and apoptotic cells decreased when they were cocultured with HFCL cells. The proportion of G0/G1 HL-60 or HL-60/VCR cells treated by TPT increased and the sub-G1 appeared significantly, but apoptotic and sub-G cells reduced after direct contact with HFCL cells. Meanwhile, although HL-60 or HL-60/VCR cells treated by TPT expressed activated caspase-3, and the expression of Bcl-2 decreased, the expression of activated caspase-3 decreased and Bcl-2 increased after direct contact with HFCL cells. In conclusion, HFCL stromal cells can prevent TPT-induced apoptosis in HL-60 and HL-60/VCR cells via modulation of Bcl-2 and active caspase-3.

关 键 词：骨髓基质细胞 急性白血病 HL60细胞 HL60/VCR细胞 细胞凋亡 

分 类 号：R733.7[医药卫生—肿瘤]