摘要：SummaryThe 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 thatOsbpl2−/−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 AbstractDisplay OmittedHighlights•LD lipolysis is impaired inOSBPL2/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 ATGLBiological Sciences; Cell Biology; Molecular Biology
