Wenmin Xia, Preethi Veeragandham, Yu Cao, Yayun Xu, Torrey E Rhyne, Jiaxin Qian, Chao-Wei Hung, Peng Zhao, Ying Jones, Hui Gao, Christopher Liddle, Ruth T Yu, Michael Downes, Ronald M Evans, Mikael Rydén, Martin Wabitsch, Zichen Wang, Hiroyuki Hakozaki, Johannes Schöneberg, Shannon M Reilly, Jianfeng Huang, Alan R Saltiel
Mitochondrial dysfunction is a characteristic trait of human and rodent obesity, insulin resistance and fatty liver disease. Here we show that high-fat diet (HFD) feeding causes mitochondrial fragmentation in inguinal white adipocytes from male mice, leading to reduced oxidative capacity by a process dependent on the small GTPase RalA. RalA expression and activity are increased in white adipocytes after HFD. Targeted deletion of RalA in white adipocytes prevents fragmentation of mitochondria and diminishes HFD-induced weight gain by increasing fatty acid oxidation...
January 29, 2024: Nature metabolism