BmATG5 and BmATG6 mediate apoptosis following autophagy induced by 20-hydroxyecdysone or starvation

文献类型： 外文期刊

第一作者： Xie, Kun

作者： Xie, Kun;Tian, Ling;Guo, Xinyu;Li, Kang;Li, Jianping;Deng, Xiaojuan;Zhong, Yangjin;Huang, Zhijun;Liu, Jiping;Yang, Wanying;Cao, Yang;Xie, Kun;Tian, Ling;Li, Kang;Li, Sheng;Li, Qingrong;Xia, Qingyou

作者机构：

关键词： autophagy;apoptosis;BmATG5;BmATG6;BmATG8;BmATG5-tN;BmATG6-C;BmATG8-PE;starvation;20-hydroxyecdysone

期刊名称：AUTOPHAGY （ 影响因子：16.016； 五年影响因子：16.586 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Autophagy and apoptosis, which could be induced by common stimuli, play crucial roles in development and disease. The functional relationship between autophagy and apoptosis is complex, due to the dual effects of autophagy. In the Bombyx Bm-12 cells, 20-hydroxyecdysone (20E) treatment or starvation-induced cell death, with autophagy preceding apoptosis. In response to 20E or starvation, BmATG8 was rapidly cleaved and conjugated with PE to form BmATG8-PE; subsequently, BmATG5 and BmATG6 were cleaved into BmATG5-tN and BmATG6-C, respectively. Reduction of expression of BmAtg5 or BmAtg6 by RNAi decreased the proportion of cells undergoing both autophagy and apoptosis after 20E treatment or starvation. Overexpression of BmAtg5 or BmAtg6 induced autophagy but not apoptosis in the absence of the stimuli, but promoted both autophagy and apoptosis induced by 20E or starvation. Notably, overexpression of cleavage site-deleted BmAtg5 or BmAtg6 increased autophagy but not apoptosis induced by 20E or starvation, whereas overexpression of BmAtg5-tN and BmAtg6-C was able to directly trigger apoptosis or promote the induced apoptosis. In conclusion, being cleaved into BmATG5-tN and BmATG6-C, BmATG5 and BmATG6 mediate apoptosis following autophagy induced by 20E or starvation in Bombyx Bm-12 cells, reflecting that autophagy precedes apoptosis in the midgut during Bombyx metamorphosis.

分类号： R1

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