...
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Death-receptor activation halts clathrin-dependent endocytosis
【24h】

Death-receptor activation halts clathrin-dependent endocytosis

机译:死亡受体激活阻止网格蛋白依赖性内吞

获取原文
获取原文并翻译 | 示例
           

摘要

Endocytosis is crucial for various aspects of cell homeostasis. Here, we show that proapoptotic death receptors (DRs) trigger selective destruction of the clathrin-dependent endocytosis machinery. DR stimulation induced rapid, caspase-mediated cleavage of key clathrin-pathway components, halting cellular uptake of the classic cargo protein transferrin. DR-proximal initiator caspases cleaved the clathrin adaptor subunit AP2 alpha between functionally distinct domains, whereas effector caspases processed clathrin's heavy chain. DR5 underwent ligand-induced, clathrin-mediated endocytosis, suggesting that internalization of DR signaling complexes facilitates clathrin-pathway targeting by caspases. An endocytosis-blocking, temperature-sensitive dynamin-1 mutant attenuated DR internalization, enhanced caspase stimulation downstream of DRs, and increased apoptosis. Thus, DR-triggered caspase activity disrupts clathrin-dependent endocytosis, leading to amplification of programmed cell death.
机译:内吞作用对于细胞稳态的各个方面至关重要。在这里,我们表明促凋亡死亡受体(DRs)触发网格蛋白依赖性内吞作用机制的选择性破坏。 DR刺激诱导网格蛋白关键途径成分的快速,caspase介导的裂解,从而停止经典货运蛋白转铁蛋白的细胞摄取。 DR近端启动子胱天蛋白酶在功能上不同的域之间切割网格蛋白衔接子亚基AP2α,而效应子胱天蛋白酶处理网格蛋白的重链。 DR5经历了配体诱导的网格蛋白介导的内吞作用,这表明DR信号复合物的内在化促进了胱天蛋白酶对网格蛋白途径的靶向。内吞阻止,温度敏感的dynamin-1突变体减缓DR内在化,增强DR下游的半胱天冬酶刺激,并增加细胞凋亡。因此,DR触发的半胱天冬酶活性破坏了网格蛋白依赖的内吞作用,导致程序性细胞死亡的放大。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号