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- W2057654841 abstract "The endoplasmic reticulum (ER) is an organelle associated with lipid metabolism. However, the involvement of the ER in nutritional status-dependent energy homeostasis is largely unknown. We demonstrate that IRE-1, an ER protein known to be involved in the unfolded protein response, and HSP-4, an ER chaperone, regulate expression of the novel fasting-induced lipases FIL-1 and FIL-2, which induce fat granule hydrolysis upon fasting in C. elegans. RNAi and ectopic expression experiments demonstrated that FIL-1 and FIL-2 are both necessary and sufficient for fasting-induced fat granule breakdown. Failure of ire-1 and hsp-4 mutant animals to hydrolyze fat granules during starvation impaired their motility, which was rescued by glucose supplementation, implicating the importance of ire-1/hsp-4-dependent lipolysis for energy supply from stored fat during fasting. These data suggest that the ER-resident proteins IRE-1 and HSP-4 are key nutritional sensors that modulate expression of inducible lipases to maintain whole-body energy homeostasis in C. elegans." @default.
- W2057654841 created "2016-06-24" @default.
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- W2057654841 date "2009-05-01" @default.
- W2057654841 modified "2023-10-16" @default.
- W2057654841 title "IRE-1 and HSP-4 Contribute to Energy Homeostasis via Fasting-Induced Lipases in C. elegans" @default.
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- W2057654841 doi "https://doi.org/10.1016/j.cmet.2009.04.004" @default.
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