RNF20 Functions as a Transcriptional Coactivator for PPARγ by Promoting NCoR1 Degradation in Adipocytes.
Yong Geun JeonJae Ho LeeYul JiJee Hyung SohnDabin LeeDong Wook KimSeul Gi YoonKyung Cheul ShinJeu ParkJe Kyung SeongJe-Yoel ChoSung Sik ChoeJae Bum KimPublished in: Diabetes (2019)
Adipose tissue is the key organ coordinating whole-body energy homeostasis. Although it has been reported that ring finger protein 20 (RNF20) regulates lipid metabolism in the liver and kidney, the roles of RNF20 in adipose tissue have not been explored. Here, we demonstrate that RNF20 promotes adipogenesis by potentiating the transcriptional activity of peroxisome proliferator-activated receptor-γ (PPARγ). Under normal chow diet feeding, Rnf20 defective (Rnf20 +/- ) mice exhibited reduced fat mass with smaller adipocytes compared with wild-type littermates. In addition, high-fat diet-fed Rnf20 +/- mice alleviated systemic insulin resistance accompanied by a reduced expansion of fat tissue. Quantitative proteomic analyses revealed significantly decreased levels of PPARγ target proteins in adipose tissue of Rnf20 +/- mice. Mechanistically, RNF20 promoted proteasomal degradation of nuclear corepressor 1 (NCoR1), which led to stimulation of the transcriptional activity of PPARγ. Collectively, these data suggest that RNF20-NCoR1 is a novel axis in adipocyte biology through fine-tuning the transcriptional activity of PPARγ.
Keyphrases
- adipose tissue
- insulin resistance
- high fat diet induced
- high fat diet
- dna damage response
- wild type
- polycystic ovary syndrome
- skeletal muscle
- metabolic syndrome
- gene expression
- transcription factor
- fatty acid
- type diabetes
- air pollution
- mass spectrometry
- physical activity
- small molecule
- deep learning
- machine learning
- dna damage
- high resolution
- artificial intelligence
- glycemic control
- protein protein