局部热化疗对鼠胶质瘤肿瘤细胞凋亡及其耐药的研究
The effects of localized thermochemotherapy on apoptosis and drugresistance of C_6 gliomas in rat
-
摘要: 目的 探讨局部热化疗对大鼠胶质瘤凋亡、耐药和肿瘤微血管的作用。方法 将C6 细胞接种于大鼠背部皮下, 肿瘤生长至 1 .5~ 2cm直径时, 分组进行局部热疗、化疗和热化疗。观察皮下肿瘤生长情况 ;用S P免疫组化法检测bax、bcl 2和 p gp蛋白表达 ;用HE染色法、电镜、TUNWL法观察凋亡 ;电镜观察肿瘤微血管的变化。结果 热疗、化疗、热化疗组较对照组瘤体缩小, 瘤重减轻 (P <0 .0 0 1 ) ;bax蛋白表达增强 (P <0 .0 0 1 ), 且热化疗组较单纯热疗和化疗组均增强 (P <0 .0 0 1 ) ;bcl 2蛋白表达改变不明显 (P >0 .0 5 ) ;化疗组 p gp表达增强 (P <0 .0 0 1 ), 热疗和热化疗组 p gp表达减弱 (P <0 .0 0 1 ) ;细胞凋亡指数增大 (P<0 .0 0 1 ) ;热化疗组出现核染色质凝聚, 凋亡小体 ;肿瘤微血管外径变小, 管壁变厚, 血管减少, 有的血管甚至只能发现完整的基膜而缺乏内皮细胞。结论 (1 )热疗化疗、热化疗能抑制肿瘤增殖, 促进bax蛋白表达, 使bcl 2 /bax减小, 诱导细胞凋亡, 且热...Abstract: Objective To study the effects of localized thermochemotherapy on apoptosis and drugresistance as well as angiogenesis of C 6 gliomas in rat. Methods C 6 glioma cells were injected subcutaneously to rats. The rats were randomly assigned to 4 groups, and treatment was initiated on Day 22 after tumor inoculation. Prior to treatment,the subcutaneous gliomas were examined to verify tumor size,which measured range 1.5 to 2.0 cm. Then localized thermochemotherapy, hyperthermia and chemot...