Intestinal IRE1 Is Required for Increased Triglyceride Metabolism and Longer Lifespan under Dietary Restriction.
Intestinal IRE1 Is Required for Increased Triglyceride Metabolism and Longer Lifespan under Dietary Restriction.
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DOI:
10.1016/j.celrep.2016.10.003
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发表时间:
2016-10-25
期刊:
影响因子:
8.8
通讯作者:
Kapahi P
中科院分区:
文献类型:
--
作者:
Luis NM;Wang L;Ortega M;Deng H;Katewa SD;Li PW;Karpac J;Jasper H;Kapahi P
Dietary restriction (DR) is one of the most robust lifespan-extending interventions in animals. The beneficial effects of DR involve a metabolic adaptation towards increased triglyceride usage. The regulatory mechanism and the tissue specificity of this metabolic switch remain unclear. Here we show that the IRE1/XBP1 ER stress signaling module mediates metabolic adaptation upon DR in flies by promoting triglyceride synthesis and accumulation in enterocytes (ECs) of the Drosophila midgut. Consistently, IRE1/XBP1 function in ECs is required for increased longevity upon DR. We further identify sugarbabe, a Gli-like zinc finger transcription factor, as a key mediator of the IRE1/XBP1 regulated induction of de novo lipogenesis in ECs. Overexpression of sugarbabe rescues metabolic and lifespan phenotypes of IRE1 loss of function conditions. Our study highlights the critical role of metabolic adaptation of the intestinal epithelium for DR-induced lifespan extension and explores the IRE1/XBP1 signaling pathway regulating this adaptation and influencing lifespan.
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