目的:观察中药单体姜黄素对ActD/TNF-α协同诱导PC12细胞凋亡的影响,并探讨其机制。方法:采用MTT法确定实验药物的最佳浓度;Hoechst33258荧光染色法观察PC12细胞的凋亡;JC-1荧光分子探针检测线粒体膜电位;Real Time PCR检测凋亡基因Bcl-...目的:观察中药单体姜黄素对ActD/TNF-α协同诱导PC12细胞凋亡的影响,并探讨其机制。方法:采用MTT法确定实验药物的最佳浓度;Hoechst33258荧光染色法观察PC12细胞的凋亡;JC-1荧光分子探针检测线粒体膜电位;Real Time PCR检测凋亡基因Bcl-2/Bax的表达。结果:ActD/TNF-α协同作用可导致PC12细胞的活力降低(P<0.05);出现核固缩、核碎裂现象的细胞增多,细胞凋亡率增高(P<0.05);细胞线粒体膜电位下降;细胞内抗凋亡基因Bcl-2的表达降低(P<0.05)。经姜黄素(5μmol/L)处理后,PC12细胞的活力增强(P<0.05);细胞核固缩、核碎裂现象减少,细胞凋亡率下降(P<0.05);细胞线粒体膜电位上升;细胞内抗凋亡基因Bcl-2的表达增强(P<0.05)。结论:姜黄素可拮抗ActD/TNF-α引起的PC12细胞凋亡,可能与升高线粒体膜电位,促进抗凋亡基因Bcl-2的表达有关。展开更多
Actinomycin D(AMD) is well known for its specific inhibition of DNA transcription, and has been used clinically as an antitumor drug for the treatment of some highly malignant tumors. Based on the former research, two...Actinomycin D(AMD) is well known for its specific inhibition of DNA transcription, and has been used clinically as an antitumor drug for the treatment of some highly malignant tumors. Based on the former research, two [D-Phe 2] 2AMD analogs with L-MeVal(the fifth amino acid residue in the cyclic depsipeptide of AMD) substituted by D-MeVal and D-MePhe were designed to reduce the toxicity and increase the antitumor activity. Another analog in which the D-Val residue replaced with D-MeVal was designed to eliminate or to weaken the hydrogen bonds of D-Val residues between α and β rings. All three novel compounds were prepared from C terminal to N terminal in solution phase to form linear pentapeptides, and cyclized by BOP-Cl/Et 3N in DCM. Condensation of pentapeptide lactone with BMNBCA, followed by catalytic reduction, controlling oxidation by K 3Fe(CN) 6 and purification afforded the analogs as red solid. The spectrum data of all three analogs including HR-MS, 1H NMR and [α] D were given.展开更多
文摘目的:观察中药单体姜黄素对ActD/TNF-α协同诱导PC12细胞凋亡的影响,并探讨其机制。方法:采用MTT法确定实验药物的最佳浓度;Hoechst33258荧光染色法观察PC12细胞的凋亡;JC-1荧光分子探针检测线粒体膜电位;Real Time PCR检测凋亡基因Bcl-2/Bax的表达。结果:ActD/TNF-α协同作用可导致PC12细胞的活力降低(P<0.05);出现核固缩、核碎裂现象的细胞增多,细胞凋亡率增高(P<0.05);细胞线粒体膜电位下降;细胞内抗凋亡基因Bcl-2的表达降低(P<0.05)。经姜黄素(5μmol/L)处理后,PC12细胞的活力增强(P<0.05);细胞核固缩、核碎裂现象减少,细胞凋亡率下降(P<0.05);细胞线粒体膜电位上升;细胞内抗凋亡基因Bcl-2的表达增强(P<0.05)。结论:姜黄素可拮抗ActD/TNF-α引起的PC12细胞凋亡,可能与升高线粒体膜电位,促进抗凋亡基因Bcl-2的表达有关。
文摘Actinomycin D(AMD) is well known for its specific inhibition of DNA transcription, and has been used clinically as an antitumor drug for the treatment of some highly malignant tumors. Based on the former research, two [D-Phe 2] 2AMD analogs with L-MeVal(the fifth amino acid residue in the cyclic depsipeptide of AMD) substituted by D-MeVal and D-MePhe were designed to reduce the toxicity and increase the antitumor activity. Another analog in which the D-Val residue replaced with D-MeVal was designed to eliminate or to weaken the hydrogen bonds of D-Val residues between α and β rings. All three novel compounds were prepared from C terminal to N terminal in solution phase to form linear pentapeptides, and cyclized by BOP-Cl/Et 3N in DCM. Condensation of pentapeptide lactone with BMNBCA, followed by catalytic reduction, controlling oxidation by K 3Fe(CN) 6 and purification afforded the analogs as red solid. The spectrum data of all three analogs including HR-MS, 1H NMR and [α] D were given.
