PMID: 9543393Apr 16, 1998Paper

Induction of the nuclear orphan receptor RORgamma during adipocyte differentiation of D1 and 3T3-L1 cells

Cell Growth & Differentiation : the Molecular Biology Journal of the American Association for Cancer Research
S AustinA M Jetten

Abstract

Here, we analyzed the expression of the three members of the retinoid-like orphan receptor (ROR) nuclear receptor subfamily during adipocyte differentiation. RORalpha and RORgamma mRNA were upregulated during adipocyte differentiation in preadipocyte D1 and 3T3-L1 cells, whereas RORbeta mRNA could not be detected. The induction of RORalpha and RORgamma mRNA succeeded the induction of peroxisome proliferator-activated receptor gamma (PPARgamma) and CCAAT/enhancer binding protein alpha and occurred at a similar time interval as did the increase in aP2 and lipoprotein lipase mRNA. Like the expression of PPARgamma and aP2, the induction of RORgamma mRNA was repressed by tumor necrosis factor alpha and transforming growth factor beta. The induction of adipogenesis by prostaglandin D2 and two thiazolidinediones in the multipotent stem cells C3H10T1/2 was also accompanied by an induction in RORgamma mRNA. In contrast to parental cells, clofibrate induces adipogenesis and RORalpha and RORgamma mRNA in BALB/c3T3 cells that ectopically express PPARgamma. RORgamma mediates its effect on transcription through specific response elements. Cotransfection of RORalpha or RORgamma and (RORgamma response element)4-chloramphenicol acetyltransferas...Continue Reading

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