CERKL regulates autophagy via the NAD-dependent deacetylase SIRT1.

CERKL regulates autophagy via the NAD-dependent deacetylase SIRT1.
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CERKL 通过 NAD 依赖性脱乙酰酶 SIRT1 调节自噬

DOI:
10.1080/15548627.2018.1520548
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发表时间:
2019-03
期刊:
影响因子:
13.3
通讯作者:
Liu M
Liu M
中科院分区:
生物学1区
文献类型:
--
作者:
Hu X;Lu Z;Yu S;Reilly J;Liu F;Jia D;Qin Y;Han S;Liu X;Qu Z;Lv Y;Li J;Huang Y;Jiang T;Jia H;Wang Q;Liu J;Shu X;Tang Z;Liu M

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摘要自噬是维持细胞内环境稳定的重要细胞内机制。在这里,我们表明CERKL(神经酰胺激酶样)基因,视网膜变性(RD)致病基因,通过稳定SIRT 1在调节自噬中起着关键作用。在体外和体内,抑制CERKL导致受损的自噬。SIRT 1是自噬中乙酰化/去乙酰化的主要调节因子之一。在CERKL缺失的视网膜和细胞中,SIRT 1下调。ATG 5和ATG 7是自噬的两个重要组成部分,在CERKL缺失的细胞中显示出更高程度的乙酰化。SIRT 1的过表达挽救了CERKL耗尽的细胞中的自噬,而CERKL在SIRT 1耗尽的细胞中失去了其调节自噬的功能,并且CERKL的过表达上调了SIRT 1。最后,我们发现CERKL直接与SIRT 1相互作用,并可能调节其Ser 27的磷酸化以稳定SIRT 1。这些结果表明,CERKL是自噬的重要调节剂,它通过稳定脱乙酰酶SIRT 1发挥这一作用。
ABSTRACT Macroautophagy/autophagy is an important intracellular mechanism for the maintenance of cellular homeostasis. Here we show that the CERKL (ceramide kinase like) gene, a retinal degeneration (RD) pathogenic gene, plays a critical role in regulating autophagy by stabilizing SIRT1. In vitro and in vivo, suppressing CERKL results in impaired autophagy. SIRT1 is one of the main regulators of acetylation/deacetylation in autophagy. In CERKL-depleted retinas and cells, SIRT1 is downregulated. ATG5 and ATG7, 2 essential components of autophagy, show a higher degree of acetylation in CERKL-depleted cells. Overexpression of SIRT1 rescues autophagy in CERKL-depleted cells, whereas CERKL loses its function of regulating autophagy in SIRT1-depleted cells, and overexpression of CERKL upregulates SIRT1. Finally, we show that CERKL directly interacts with SIRT1, and may regulate its phosphorylation at Ser27 to stabilize SIRT1. These results show that CERKL is an important regulator of autophagy and it plays this role by stabilizing the deacetylase SIRT1.
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