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Cell. 2013 Feb 14;152(4):778-790. doi: 10.1016/j.cell.2013.01.023. Epub 2013 Feb 7.

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

Author information

1
Department of Biology, University of Pennsylvania, 415 S. University Ave., Philadelphia, Pennsylvania 19104, USA.
2
Howard Hughes Medical Institute, Department of Cardiology, Children's Hospital, Boston, Massachusetts 02115, USA.
3
INSERM U954, Nutrition Génétique et exposition aux risques environnementaux Faculté de Médecine - BP 184, Université de Lorraine, 54505 VANDOEUVRE LES NANCY CEDEX, FRANCE.
4
Division of Child Development and Metabolic Disease, Children's Hospital of Philadelphia, Department of Pediatrics, Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.
#
Contributed equally

Abstract

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 (lysoNa(ATP)). 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 amino acid homeostasis. Mutant mice lacking lysoNa(ATP) have much reduced exercise endurance after fasting. Thus, TPCs make up an ion channel family that couples the cell's metabolic state to endolysosomal function and are crucial for physical endurance during food restriction.

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PMID:
23394946
PMCID:
PMC3908667
DOI:
10.1016/j.cell.2013.01.023
[Indexed for MEDLINE]
Free PMC Article

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