Lysosomal metabolomics reveals V-ATPase- and mTOR-dependent regulation of amino acid efflux from lysosomes.
Lysosomal metabolomics reveals V-ATPase- and mTOR-dependent regulation of amino acid efflux from lysosomes.
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DOI:
10.1126/science.aan6298
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发表时间:
2017-11-10
期刊:
影响因子:
--
通讯作者:
Sabatini DM
中科院分区:
文献类型:
--
作者:
Abu-Remaileh M;Wyant GA;Kim C;Laqtom NN;Abbasi M;Chan SH;Freinkman E;Sabatini DM
The lysosome degrades and recycles macromolecules, signals to the cytosol and nucleus, and is implicated in many diseases. Here we describe a method for the rapid isolation of mammalian lysosomes and use it to quantitatively profile lysosomal metabolites under various cell states. Under nutrient replete conditions, many lysosomal amino acids are in rapid exchange with those in the cytosol. Loss of lysosomal acidification through inhibition of the vacuolar H+ATPase (V-ATPase) increased the luminal concentrations of most metabolites, but had no effect on those of the majority of essential amino acids. Instead, nutrient starvation regulates the lysosomal concentrations of these amino acids, an effect we traced to regulation of the mTOR pathway. Inhibition of mTOR strongly reduced the lysosomal efflux of most essential amino acids, converting the lysosome into a cellular depot for them. These results reveal the dynamic nature of lysosomal metabolites and that V-ATPase- and mTOR-dependent mechanisms exist for controlling lysosomal amino acid efflux.
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发表时间:
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期刊:
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通讯作者:
Sabatini DM