首页> 外文期刊>Nature >Toll-like receptor signalling in macrophages links the autophagy pathway to phagocytosis
【24h】

Toll-like receptor signalling in macrophages links the autophagy pathway to phagocytosis

机译:巨噬细胞中的Toll样受体信号转导将自噬途径与吞噬作用联系起来

获取原文
获取原文并翻译 | 示例
           

摘要

Phagocytosis and autophagy are two ancient, highly conserved processes involved, respectively, in the removal of extracellular organisms and the destruction of organisms in the cytosol. Autophagy, for either metabolic regulation or defence, involves the formation of a double membrane called the autophagosome, which then fuses with lysosomes to degrade the contents, a process that has similarities with phagosome maturation. Toll-like-receptor (TLR) engagement activates a variety of defence mechanisms within phagocytes, including facilitation of phagosome maturation, and also engages autophagy. Therefore we speculated that TLR signalling might link these processes to enhance the function of conventional phagosomes. Here we show that a particle that engages TLRs on a murine macrophage while it is phagocytosed triggers the autophagosome marker LC3 to be rapidly recruited to the phagosome in a manner that depends on the autophagy pathway proteins ATG5 and ATG7; this process is preceded by recruitment of beclin 1 and phosphoinositide-3-OH kinase activity. Translocation of beclin 1 and LC3 to the phagosome was not associated with observable double-membrane structures characteristic of conventional autophagosomes, but was associated with phagosome fusion with lysosomes, leading to rapid acidification and enhanced killing of the ingested organism.
机译:吞噬作用和自噬是两个古老的,高度保守的过程,分别涉及细胞外生物的去除和细胞质中生物的破坏。用于代谢调节或防御的自噬涉及形成称为自噬体的双层膜,然后将其与溶酶体融合以降解内含物,这一过程与吞噬体的成熟相似。 Toll样受体(TLR)参与激活吞噬细胞内的多种防御机制,包括促进吞噬体成熟,并且也参与自噬。因此,我们推测TLR信号传导可能将这些过程联系起来,以增强常规吞噬体的功能。在这里,我们显示了在吞噬细胞时与鼠巨噬细胞上的TLR结合的粒子会触发自噬标记物LC3,以依赖于自噬途径蛋白ATG5和ATG7的方式迅速募集到吞噬体。在此过程之前,需要募集beclin 1和磷酸肌醇-3-OH激酶活性。 Beclin 1和LC3向吞噬体的易位与常规自噬体的可观察到的双膜结构无关,但与吞噬体与溶酶体融合有关,导致快速酸化并增强了对被摄入生物的杀死。

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