Digitoxigenin-3-beta-glucoside通过死亡受体途径诱导人肺腺癌A549细胞凋亡
首发时间:2013-03-13
摘要:目的:暗消藤(Streptocaulon juventas (Lour.) Merr.)属于我国西南地区特有药用品种,digitoxigenin-3-beta-glucoside(AXT6)为暗消藤主要化学成分。本论文研究了AXT6体外抑制人肺腺癌A549细胞增殖作用及其对Fas死亡受体途径的影响。 方法:采用MTT法考察AXT6对A549细胞及其对人外周血单核细胞(hPBMC)生长的影响;采用试剂盒测定AXT6对Na+/K+-ATPase活性的影响;采用相差显微镜、AO荧光染色及流式细胞术PI染色法考察AXT6诱导细胞凋亡的情况;采用Western Blot法考察AXT6对相关蛋白的影响。结果:AXT6呈时间剂量依赖性抑制A549细胞增殖,其作用强于紫杉醇,且其对hPBMC无明显细胞毒作用;显著抑制A549细胞中Na+/K+-ATPase活性;诱导A549细胞出现凋亡样形态学变化;时间依赖性上调A549细胞SubG0/G1期比率;时间依赖性上调死亡受体Fas及其下游 FADD的表达,活化caspase-8、-3,降解ICAD,启动外源性凋亡级联反应。结论:AXT6通过Fas死亡受体途径诱导A549细胞凋亡。
关键词: 药理学 digitoxigenin-3-beta-glucoside Na+/K+-ATP酶 死亡受体
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Digitoxigenin-3-beta-glucoside induces human lung carcinoma A549 cell apoptosis through Fas death receptor pathway
Abstract:Objective: To study the antiproliferative effect of digitoxigenin-3-beta-glucoside (AXT6), an active compound isolated from Chinese folk medicine Streptocaulon juventas (Lour.) Merr., on human non-small cell lung cancer A549 cell and its effects on Fas death receptor signaling pathway. Methods: MTT method was used to examine the antiproliferative effect of AXT6 on A549 cells and on human peripheral blood mononuclear cells (hPBMC). AXT6's inhibitory effect on Na+/K+-ATPase activity was determined by a commercial kit. Phase contrast microscopy, AO staining and flowcytometric analysis were used to confirm AXT6's apoptosis-inducing effect. Western blotting was used to examine AXT6's effect on Fas signaling pathway.Results: AXT6 time and dose-dependently inhibited A549 cells' proliferation while it had no obvious cytotoxic effect on hPBMC. AXT6 suppressed Na+/K+-ATPase activity, induced apoptotic morphological changes in A549 cells. Flow cytometric analysis result also confirmed that AXT6 increased sub G0/G1population. AXT6 time-dependently up-regulated the expression of Fas and FADD, induced procaspase-8 to be cleaved into caspase-8. It stimulated pro-caspase-3 to be digested to the active form caspase-3 and the degradation of ICAD.Conclusion: These results indicated that AXT6 induced apoptosis by activating the Fas death receptor pathway in A549 cells.
Keywords: pharmacology digitoxigenin-3-beta-glucoside Na+/K+-ATPase death receptor
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Digitoxigenin-3-beta-glucoside通过死亡受体途径诱导人肺腺癌A549细胞凋亡
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