The ubiquitin ligase Fbxw7 controls adipocyte differentiation by targeting C/EBPα for degradation

Adipose tissue controls bodylipid and energy metabolism, as well as food intake, and abnormalities in adipose function play a central role in diseases such as obesity and type-2 diabetes. Adipocyte differentiation is controlled by a transcriptional cascade involving PPARγ and members of the C/EBP family of transcription factors. Here, we demonstrate that C/EBPα is targeted for degradation by the ubiquitin ligase Fbxw7 in a phosphorylation-dependent manner. Importantly, inactivation of Fbxw7 is sufficient to convert mouse preadipocytes into mature adipocytes in a manner dependent on C/EBPα. In addition, inactivation of Fbxw7 promotes adipocyte differentiation of human adult stem cells. Taken together, our results suggest that Fbxw7 is a negative regulator of adipogenesis by targeting C/EBPαfor degradation. This notion is supportedby the observation that the expression of Fbxw7 is down-regulated during adipocyte differentiation, resulting in the accumulation of proadipogenic proteins such as C/EBPα. Thus, Fbxw7 could be an important regulator of energy and lipid metabolism.