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
Kapahi P
中科院分区:
生物学1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

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饮食限制(DR)是最有效的延长动物寿命的干预措施之一。DR的有益作用包括对甘油三酯使用增加的代谢适应。这种代谢开关的调节机制和组织特异性尚不清楚。本研究表明,IRE1/XBP1 ER应激信号模块通过促进果蝇中肠肠细胞(ECs)中甘油三酯的合成和积累,介导果蝇对DR的代谢适应。一致地,IRE1/XBP1在内皮细胞中的功能是延长dr寿命所必需的。我们进一步确定了sugarbabe,一种胶质样锌指转录因子,作为IRE1/XBP1调节诱导内皮细胞从头脂肪生成的关键介质。过表达sugarbabe可挽救IRE1功能丧失的代谢和寿命表型。我们的研究强调了肠道上皮代谢适应在dr诱导的寿命延长中的关键作用,并探索了IRE1/XBP1信号通路调节这种适应并影响寿命。
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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