Suppr超能文献

VPS4A 是小鼠和人类中脂噬的选择性受体。

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

机构信息

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.

CSIR-Institute of Genomics and Integrative Biology, New Delhi, India; Academy of Scientific and Innovative Research, Ghaziabad, India.

出版信息

Mol Cell. 2024 Nov 21;84(22):4436-4453.e8. doi: 10.1016/j.molcel.2024.10.022. Epub 2024 Nov 8.

Abstract

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 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 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.

摘要

脂噬作用是溶酶体降解脂质滴(LDs)的一种普遍机制。自噬受体选择性地将细胞器靶向溶酶体降解。脂噬作用的选择性受体仍然难以捉摸。使用小鼠肝磷酸蛋白质组学和人肝转录组学,我们确定液泡蛋白分选相关蛋白 4A(VPS4A),一种大型 AAA+ATP 酶家族的成员,是脂噬作用的选择性受体。我们表明,VPS4A 在丝氨酸上的磷酸化及其在饥饿反应中向 LDs 的定位驱动脂噬作用。成像/三维(3D)重建和生化分析揭示了 VPS4A 和 LDs 在溶酶体中以自噬基因 7 敏感的方式同时降解。沉默 VPS4A 或靶向 VPS4A 磷酸化或 VPS4A 与 LDs 或 LC3 的结合均可阻断脂噬作用,而不影响其他形式的选择性自噬。最后,VPS4A 水平和脂噬作用的标志物在人脂肪性肝中显著降低——揭示了 VPS4A 作为小鼠和人类脂噬作用受体的基本作用。

相似文献

1
VPS4A is the selective receptor for lipophagy in mice and humans.
Mol Cell. 2024 Nov 21;84(22):4436-4453.e8. doi: 10.1016/j.molcel.2024.10.022. Epub 2024 Nov 8.
2
Identification of the mammalian VPS4A as a selective lipophagy receptor.
Autophagy. 2025 Apr;21(4):691-692. doi: 10.1080/15548627.2024.2441535. Epub 2025 Jan 3.
3
Identification of novel lipid droplet factors that regulate lipophagy and cholesterol efflux in macrophage foam cells.
Autophagy. 2021 Nov;17(11):3671-3689. doi: 10.1080/15548627.2021.1886839. Epub 2021 Feb 26.
4
The ménage à trois of autophagy, lipid droplets and liver disease.
Autophagy. 2022 Jan;18(1):50-72. doi: 10.1080/15548627.2021.1895658. Epub 2021 Apr 2.
5
Lipophagy-derived fatty acids undergo extracellular efflux via lysosomal exocytosis.
Autophagy. 2021 Mar;17(3):690-705. doi: 10.1080/15548627.2020.1728097. Epub 2020 Feb 19.
6
Mitochondrial phosphatase PPTC7 promotes EGFR recycling by facilitating VPS4A endosomal localization.
J Cell Sci. 2025 Jan 15;138(2). doi: 10.1242/jcs.263676. Epub 2025 Jan 31.
8
PNPLA3 variant M148 causes resistance to starvation-mediated lipid droplet autophagy in human hepatocytes.
J Cell Biochem. 2019 Jan;120(1):343-356. doi: 10.1002/jcb.27378. Epub 2018 Sep 1.
9
The human AAA-ATPase VPS4A isoform and its co-factor VTA1 have a unique function in regulating mammalian cytokinesis abscission.
PLoS Biol. 2024 Apr 30;22(4):e3002327. doi: 10.1371/journal.pbio.3002327. eCollection 2024 Apr.

引用本文的文献

2
The expanding repertoire of ESCRT functions in cell biology and disease.
Nature. 2025 Jun 25. doi: 10.1038/s41586-025-08950-y.
4
Identification of the mammalian VPS4A as a selective lipophagy receptor.
Autophagy. 2025 Apr;21(4):691-692. doi: 10.1080/15548627.2024.2441535. Epub 2025 Jan 3.

本文引用的文献

1
The Troyer syndrome protein spartin mediates selective autophagy of lipid droplets.
Nat Cell Biol. 2023 Aug;25(8):1101-1110. doi: 10.1038/s41556-023-01178-w. Epub 2023 Jul 13.
2
mTORC2-NDRG1-CDC42 axis couples fasting to mitochondrial fission.
Nat Cell Biol. 2023 Jul;25(7):989-1003. doi: 10.1038/s41556-023-01163-3. Epub 2023 Jun 29.
3
SQSTM1/p62 and Hepatic Mallory-Denk Body Formation in Alcohol-Associated Liver Disease.
Am J Pathol. 2023 Oct;193(10):1415-1426. doi: 10.1016/j.ajpath.2023.02.015. Epub 2023 Mar 9.
4
Join the club: ORP8 is a lipophagy receptor.
Protein Cell. 2023 Sep 14;14(9):632-634. doi: 10.1093/procel/pwad005.
5
ORP5 and ORP8 orchestrate lipid droplet biogenesis and maintenance at ER-mitochondria contact sites.
J Cell Biol. 2022 Sep 5;221(9). doi: 10.1083/jcb.202112107. Epub 2022 Aug 12.
6
Friction-driven membrane scission by the human ESCRT-III proteins CHMP1B and IST1.
Proc Natl Acad Sci U S A. 2022 Jul 19;119(29):e2204536119. doi: 10.1073/pnas.2204536119. Epub 2022 Jul 11.
7
Phosphorylation by casein kinase 2 enhances the interaction between ER-phagy receptor TEX264 and ATG8 proteins.
EMBO Rep. 2022 Jun 7;23(6):e54801. doi: 10.15252/embr.202254801. Epub 2022 Apr 13.
8
DeepREx-WS: A web server for characterising protein-solvent interaction starting from sequence.
Comput Struct Biotechnol J. 2021 Oct 13;19:5791-5799. doi: 10.1016/j.csbj.2021.10.016. eCollection 2021.
10
Lipolysis and lipophagy play individual and interactive roles in regulating triacylglycerol and cholesterol homeostasis and mitochondrial form in zebrafish.
Biochim Biophys Acta Mol Cell Biol Lipids. 2021 Sep;1866(9):158988. doi: 10.1016/j.bbalip.2021.158988. Epub 2021 Jun 8.

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验