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Suppressive effects of aryl-hydrocarbon receptor repressor on adipocyte differentiation in 3T3-L1 cells.

Arch. Biochem. Biophys.2018 Mar 15;642:75-80. Epub 2018 Feb 09
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摘要


The aryl-hydrocarbon receptor repressor (AhRR) negatively regulates aryl-hydrocarbon receptor (AhR) signaling via its inhibitory transactivation. AhR is well known to suppress adipocyte differentiation, but the function of AhRR during adipogenesis is unclear. The purpose of this study was to investigate the role of AhRR in adipocyte differentiation using 3T3-L1 cells. During the early phase of differentiation, AhRR expression was transiently induced, but throughout the entire differentiation process, low levels of AhR expression were maintained. AhRR knockdown significantly increased not only glycerol-3-phosphate dehydrogenase (GPDH) activity but also lipid accumulation inside the cells. AhRR overexpression clearly reduced GPDH activity and lipid accumulation, indicating that AhRR upregulation during the early stage of adipogenesis suppresses adipocyte differentiation. Since AhRR knockdown increases the expression and activity of peroxisome proliferator-activated receptor γ (PPARγ), AhRR negatively regulates PPARγ during adipogenesis. In summary, similar to AhR, AhRR acts as an inhibitor of adipocyte differentiation. In addition to controlling the negative feedback loop of AhR, AhRR might be involved in other functions, especially in adipocyte differentiation processes.

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