BODIPY (boron dipyrromethene) staining of lipid droplets
The cells were washed with PBS, fixed with 3% formaldehyde for 15 min and stained with BODIPY 493/503 (stock 1 mg/ml, working solution 1:1000 dilution; Invitrogen) for 15 min atroom temperature (25◦C). Cells were then mounted with Prolong gold antifade reagent containing DAPI (4,6-diamidino-2-phenylindole; Invitrogen).Oil Red O staining of lipid dropletsFrozen liver tissue sections were stained with Oil Red O accordingto the standard protocol to visualize lipid droplet content. Briefly,frozen liver tissue sections of 8 μm were air-dried and then fixedin formalin. The fixed sections were rinsed with 60% propan-2-olbefore they were stained with freshly prepared Oil Red O solution for 15 min.