研究麦冬皂苷D对麦冬皂苷D'诱导大鼠心肌细胞凋亡的干预作用及可能机制,为麦冬皂苷类成分的毒效差异深入研究提供参考。CCK-8法检测麦冬皂苷D与麦冬皂苷D'共处理对细胞存活率的影响; Western blot法及RT-PCR法检测麦冬皂苷D及...研究麦冬皂苷D对麦冬皂苷D'诱导大鼠心肌细胞凋亡的干预作用及可能机制,为麦冬皂苷类成分的毒效差异深入研究提供参考。CCK-8法检测麦冬皂苷D与麦冬皂苷D'共处理对细胞存活率的影响; Western blot法及RT-PCR法检测麦冬皂苷D及麦冬皂苷D'对内质网应激相关基因PERK,Bip,ATF-4,p-eIF2α及CHOP表达的影响;流式细胞仪检测细胞凋亡率;通过内质网形态特异性示踪探针检测麦冬皂苷D'造成的内质网形态改变及麦冬皂苷D的逆转效果,探究麦冬皂苷D保护心肌细胞损伤的可能作用机制。细胞实验结果显示,6μmol·L-1的麦冬皂苷D'可显著诱导内质网应激相关蛋白的表达,导致细胞内质网形态发生变化,促进细胞凋亡。不同浓度的麦冬皂苷D可在一定程度上逆转麦冬皂苷D'引起的心肌细胞损伤。结果表明,麦冬皂苷D可降低麦冬皂苷D'触发的内质网应激,进而对心肌细胞产生保护作用。展开更多
AIM: Radiation induces an important apoptosis response in irradiated organs. The objective of this study was to investigate the radioprotective effect of tetramethylpyrazine(TMP) on irradiated lymphocytes and discover...AIM: Radiation induces an important apoptosis response in irradiated organs. The objective of this study was to investigate the radioprotective effect of tetramethylpyrazine(TMP) on irradiated lymphocytes and discover the possible mechanism of protection. METHOD: Lymphocytes were pretreated for 12 h with TMP(25-200 μmol·L-1) and then exposed to 4 Gy radiation. Cell apoptosis and the signaling pathway were analyzed. RESULTS: Irradiation increased cell death, DNA fragmentation, activated caspase activation and cytochrome c translocation, downregulated B-cell lymphoma 2(Bcl-2) and up-regulated Bcl-2-associated X protein(Bax). Pretreated with TMP significantly reversed this tendency. Several anti-apoptotic characteristics of TMP, including the ability to increase cell viability, inhibit caspase-9 activation, and upregulate Bcl-2 and down-regulate Bax in 4Gy-irradiated lymphocytes were determined. Signal pathway analysis showed TMP could translate nuclear factor-κB(NF-κB) from cytosol into the nucleus. CONCLUSION: The results suggest that TMP had a radioprotective effect through the NF-κB pathway to inhibit apoptosis, and it may be an effective candidate for treating radiation diseases associated with cell apoptosis.展开更多
文摘研究麦冬皂苷D对麦冬皂苷D'诱导大鼠心肌细胞凋亡的干预作用及可能机制,为麦冬皂苷类成分的毒效差异深入研究提供参考。CCK-8法检测麦冬皂苷D与麦冬皂苷D'共处理对细胞存活率的影响; Western blot法及RT-PCR法检测麦冬皂苷D及麦冬皂苷D'对内质网应激相关基因PERK,Bip,ATF-4,p-eIF2α及CHOP表达的影响;流式细胞仪检测细胞凋亡率;通过内质网形态特异性示踪探针检测麦冬皂苷D'造成的内质网形态改变及麦冬皂苷D的逆转效果,探究麦冬皂苷D保护心肌细胞损伤的可能作用机制。细胞实验结果显示,6μmol·L-1的麦冬皂苷D'可显著诱导内质网应激相关蛋白的表达,导致细胞内质网形态发生变化,促进细胞凋亡。不同浓度的麦冬皂苷D可在一定程度上逆转麦冬皂苷D'引起的心肌细胞损伤。结果表明,麦冬皂苷D可降低麦冬皂苷D'触发的内质网应激,进而对心肌细胞产生保护作用。
基金supported by the National Nature Sciences Foundation of China(Nos.81073028,81130067 and 81274127)
文摘AIM: Radiation induces an important apoptosis response in irradiated organs. The objective of this study was to investigate the radioprotective effect of tetramethylpyrazine(TMP) on irradiated lymphocytes and discover the possible mechanism of protection. METHOD: Lymphocytes were pretreated for 12 h with TMP(25-200 μmol·L-1) and then exposed to 4 Gy radiation. Cell apoptosis and the signaling pathway were analyzed. RESULTS: Irradiation increased cell death, DNA fragmentation, activated caspase activation and cytochrome c translocation, downregulated B-cell lymphoma 2(Bcl-2) and up-regulated Bcl-2-associated X protein(Bax). Pretreated with TMP significantly reversed this tendency. Several anti-apoptotic characteristics of TMP, including the ability to increase cell viability, inhibit caspase-9 activation, and upregulate Bcl-2 and down-regulate Bax in 4Gy-irradiated lymphocytes were determined. Signal pathway analysis showed TMP could translate nuclear factor-κB(NF-κB) from cytosol into the nucleus. CONCLUSION: The results suggest that TMP had a radioprotective effect through the NF-κB pathway to inhibit apoptosis, and it may be an effective candidate for treating radiation diseases associated with cell apoptosis.
