Andrew Young,Masako Narita,Manuela Ferreira,Kristina Kirschner,Mahito Sadaie,Jeremy F. J. Darot,Simon Tavaré,Satoko Arakawa,Shigeomi Shimizu,Fiona M. Watt,Masashi Narita
出处
期刊:Genes & Development [Cold Spring Harbor Laboratory] 日期:2009-03-11卷期号:23 (7): 798-803被引量:899
As a stress response, senescence is a dynamic process involving multiple effector mechanisms whose combination determines the phenotypic quality. Here we identify autophagy as a new effector mechanism of senescence. Autophagy is activated during senescence and its activation is correlated with negative feedback in the PI3K-mammalian target of rapamycin (mTOR) pathway. A subset of autophagy-related genes are up-regulated during senescence: Overexpression of one of those genes, ULK3, induces autophagy and senescence. Furthermore, inhibition of autophagy delays the senescence phenotype, including senescence-associated secretion. Our data suggest that autophagy, and its consequent protein turnover, mediate the acquisition of the senescence phenotype.