mTOR regulates lysosomal ATP-sensitive two-pore Na(+) channels to adapt to metabolic state.

mTOR regulates lysosomal ATP-sensitive two-pore Na(+) channels to adapt to metabolic state.
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DOI:
10.1016/j.cell.2013.01.023
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发表时间:
2013-02-14
期刊:
影响因子:
64.5
通讯作者:
Ren D
Ren D
中科院分区:
生物学1区
文献类型:
--
作者:
Cang C;Zhou Y;Navarro B;Seo YJ;Aranda K;Shi L;Battaglia-Hsu S;Nissim I;Clapham DE;Ren D

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Survival in the wild requires organismal adaptations to the availability of nutrients. Endosomes and lysosomes are key intracellular organelles that couple nutrition and metabolic status to cellular responses, but how they detect cytosolic ATP levels is not well understood. Here we identify an endolysosomal ATP-sensitive Na+ channel (lysoNaATP). The channel is a complex formed by Two-Pore Channels (TPC1 and TPC2), ion channels previously thought to be gated by nicotinic acid adenine dinucleotide phosphate (NAADP), and the mammalian target of rapamycin (mTOR). The channel complex detects nutrient status, becomes constitutively open upon nutrient removal and mTOR translocation off the lysosomal membrane, and controls the lysosome's membrane potential, pH stability, and the amino acid homeostasis. Mutant mice lacking lysoNaATP have much reduced exercise endurance after fasting. Thus, TPCs are a new ion channel family that couple the cell's metabolic state to endolysosomal function and are crucial for physical endurance during food restriction.
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