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苯乙酸对C6胶质瘤细胞凋亡的影响及机制研究
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摘要
目的:观察诱导分化剂苯乙酸(PA)对C6胶质瘤细胞凋亡的影响,探讨其作用机制。
     方法:通过体外培养C6胶质瘤细胞,给予不同浓度的PA(2.5、5.0和7.5mmol/L)分别诱导分化24、48、72和96h,采用MTT比色法检测PA对C6细胞增殖抑制率,采用显微镜和透射电镜观察细胞形态学变化,流式细胞仪(FCM)和TUNEL检测细胞凋亡,免疫组化或原位杂交检测PA对Bcl-2、Bax、survivin、p53和GFAP表达的影响,激光共聚焦显微镜检测PA对细胞内游离Ca~(2+)浓度的影响。并建立wistar大鼠C6胶质瘤动物模型,腹腔注射PA治疗,研究PA对C6胶质瘤细胞凋亡的影响,检测PA对Bcl-2、Bax、survivin、p53和GFAP表达的影响。
     结果:体外实验显示:PA显著抑制C6胶质瘤细胞生长,细胞增殖抑制率随PA浓度和作用时间的增加而增加。在PA作用后,透射电镜观察发现凋亡细胞;FCM和TUNEL检测发现:随PA浓度的增加和作用时间的延长,C6胶质瘤细胞凋亡率增加。免疫组化检测发现PA对Bcl-2、p53和survivin表达没有影响,PA能显著增强GFAP和Bax的表达。原位杂交检测PA对Bcl-2表达没有影响,PA能显著增强Bax的表达。PA作用72h后能明显增加细胞内游离Ca~(2+)浓度,并且随药物浓度的增加而增加,与细胞凋亡率的变化一致。
     体内实验显示:实验组的生存时间比对照组明显延长,透射电镜观
Objective: To investigate the effect of differentiation inducer-phenylacetate(PA) on apoptosis in rat C6 glioma cells and to study the mechanisms of PA.
    Methods: C6 cells were cultured in vitro. After induced by PA at different concentrations (2.5, 5.0 and 7.5mmol /L) , the rate of cell proliferation inhibition was measured by MTT assay at different time-points(24,48,72 and 96h). The changes of cell morphology was observed by microscope and transmission electron microscope(TEM). Apoptosis was detected by flow cytometry (FCM) with AnnexinV/ propidium iodide(PI) and TUNEL assay. The expression of Bax, Bcl-2, survivin, p53 and GFAP was determined by IC or ISH. The level of intracellular free calcium was determined by laser Confocal scanning microscopy with calcium-flourecent probes-Fluo-3/AM.
    Then C6 cells were transplanted into the brain of Wistar rats. PA was administered by peritoneal injection. Apoptosis was detected by TEM and TUNEL. The expression of Bax, Bcl-2, survivin, p53 and GFAP was determined by IC or ISH.
    Results: In vitro, the growth of C6 cells was obviously inhibited by PA, and the inhibition rate was increased with the increase of concentration and
引文
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