VPS4A is the selective receptor for lipophagy in mice and humans.

Autor:	Das D; Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA; Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA., Sharma M; Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA; Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA., Gahlot D; CSIR-Institute of Genomics and Integrative Biology, New Delhi, India; Academy of Scientific and Innovative Research, Ghaziabad, India., Nia SS; California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, USA; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, USA; Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, Los Angeles, CA, USA., Gain C; Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA; Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA., Mecklenburg M; California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, USA., Zhou ZH; California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, USA; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, USA; Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, Los Angeles, CA, USA., Bourdenx M; UK Dementia Research Institute, London, UK; UCL Queen Square Institute of Neurology, London, UK., Thukral L; CSIR-Institute of Genomics and Integrative Biology, New Delhi, India; Academy of Scientific and Innovative Research, Ghaziabad, India., Martinez-Lopez N; Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA; Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA; Comprehensive Liver Research Center at University of California, Los Angeles, Los Angeles, CA, USA., Singh R; Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA; Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA; Comprehensive Liver Research Center at University of California, Los Angeles, Los Angeles, CA, USA. Electronic address: rajatsingh@mednet.ucla.edu.
Jazyk:	angličtina
Zdroj:	Molecular cell [Mol Cell] 2024 Nov 21; Vol. 84 (22), pp. 4436-4453.e8. Date of Electronic Publication: 2024 Nov 08.
DOI:	10.1016/j.molcel.2024.10.022
Abstrakt:	Lipophagy is a ubiquitous mechanism for degradation of lipid droplets (LDs) in lysosomes. Autophagy receptors selectively target organelles for lysosomal degradation. The selective receptor for lipophagy remains elusive. Using mouse liver phosphoproteomics and human liver transcriptomics, we identify vacuolar-protein-sorting-associated protein 4A (VPS4A), a member of a large family AAA+ ATPases, as a selective receptor for lipophagy. We show that phosphorylation of VPS4A on Ser 95,97 and its localization to LDs in response to fasting drives lipophagy. Imaging/three-dimensional (3D) reconstruction and biochemical analyses reveal the concomitant degradation of VPS4A and LDs in lysosomes in an autophagy-gene-7-sensitive manner. Either silencing VPS4A or targeting VPS4A S95,S97 phosphorylation or VPS4A binding to LDs or LC3 blocks lipophagy without affecting other forms of selective autophagy. Finally, VPS4A levels and markers of lipophagy are markedly reduced in human steatotic livers-revealing a fundamental role of VPS4A as the lipophagy receptor in mice and humans. Competing Interests: Declaration of interests The authors declare no competing interests. (Copyright © 2024 The Author(s). Published by Elsevier Inc. All rights reserved.)
Databáze:	MEDLINE
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