OSBPL2 Is Required for the Binding of COPB1 to ATGL and the Regulation of Lipid Droplet Lipolysis
| Autor: | Yuan Qu, Xujun Tang, Yajie Lu, Tianming Wang, Jun Yao, Lihong Liang, Qinjun Wei, Xin Cao, Guangqian Xing, Zhibin Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
02 engineering and technology Article 03 medical and health sciences Insulin resistance Lipid droplet medicine Lipolysis Lipase lcsh:Science Molecular Biology Multidisciplinary biology Catabolism Chemistry Endoplasmic reticulum Cell Biology Biological Sciences 021001 nanoscience & nanotechnology medicine.disease Cell biology 030104 developmental biology biology.protein lipids (amino acids peptides and proteins) lcsh:Q 0210 nano-technology Plant lipid transfer proteins Homeostasis |
| Zdroj: | iScience, Vol 23, Iss 7, Pp 101252-(2020) iScience |
| ISSN: | 2589-0042 |
| Popis: | Summary The accumulation of giant lipid droplets (LDs) increases the risk of metabolic disorders including obesity and insulin resistance. The lipolysis process involves the activation and transfer of lipase, but the molecular mechanism is not completely understood. The translocation of ATGL, a critical lipolysis lipase, from the ER to the LD surface is mediated by an energy catabolism complex. Oxysterol-binding protein-like 2 (OSBPL2/ORP2) is one of the lipid transfer proteins that regulates intracellular cholesterol homeostasis. A recent study has proven that Osbpl2−/− pigs exhibit hypercholesterolemia and obesity phenotypes with an increase in adipocytes. In this study, we identified that OSBPL2 links the endoplasmic reticulum (ER) with LDs, binds to COPB1, and mediates ATGL transport. We provide important insights into the function of OSBPL2, indicating that it is required for the regulation of lipid droplet lipolysis. Graphical Abstract Highlights • LD lipolysis is impaired in OSBPL2/osbpl2b-mutant HepG2 cells and zebrafish • OSBPL2 interacts with COPB1, a subunit of the COPI complex located on LDs • Altered COPI complexes on LDs may perturb the trafficking of lipolysis lipase ATGL Biological Sciences; Cell Biology; Molecular Biology |
| Databáze: | OpenAIRE |
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