KEAP1型
自噬
转录因子
泛素连接酶
细胞生物学
生物
下调和上调
泛素
卡林
抄写(语言学)
化学
基因
生物化学
语言学
哲学
细胞凋亡
作者
Masaaki Komatsu,H. Kurokawa,Satoshi Waguri,Keiko Taguchi,Akira Kobayashi,Yoshinobu Ichimura,Yu‐shin Sou,Izumi Ueno,Ayako Sakamoto,Kit I. Tong,Mihee Kim,Yasumasa Nishito,Shun-ichiro Iemura,Tohru Natsume,Takashi Ueno,Eiki Kominami,Hozumi Motohashi,Keiji Tanaka,Masayuki Yamamoto
摘要
Impaired selective turnover of p62 by autophagy causes severe liver injury accompanied by the formation of p62-positive inclusions and upregulation of detoxifying enzymes. These phenotypes correspond closely to the pathological conditions seen in human liver diseases, including alcoholic hepatitis and hepatocellular carcinoma. However, the molecular mechanisms and pathophysiological processes in these events are still unknown. Here we report the identification of a novel regulatory mechanism by p62 of the transcription factor Nrf2, whose target genes include antioxidant proteins and detoxification enzymes. p62 interacts with the Nrf2-binding site on Keap1, a component of Cullin-3-type ubiquitin ligase for Nrf2. Thus, an overproduction of p62 or a deficiency in autophagy competes with the interaction between Nrf2 and Keap1, resulting in stabilization of Nrf2 and transcriptional activation of Nrf2 target genes. Our findings indicate that the pathological process associated with p62 accumulation results in hyperactivation of Nrf2 and delineates unexpected roles of selective autophagy in controlling the transcription of cellular defence enzyme genes.
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