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- W2133308052 abstract "Recent studies have revealed the essential role of retinol binding protein 4 (RBP4) in insulin resistance. However, the impact of RBP4 on aberrant lipogenesis, the common hepatic manifestation in insulin resistance states, and the underlying mechanism remain elusive. The present study was designed to examine the effect of RBP4 on sterol regulatory element-binding protein (SREBP-1) and hepatic lipogenesis. Treatment with human retinol-bound RBP4 (holo-RBP4) significantly induced intracellular triglyceride (TAG) synthesis in HepG2 cells and this effect is retinol-independent. Furthermore, RBP4 treatment enhanced the levels of mature SREBP-1 and its nuclear translocation, thereby increasing the expression of lipogenic genes, including fatty acid synthase (FAS), acetyl coenzyme A carboxylase-1 (ACC-1), and diacylglycerol O-acyltransferase 2 (DGAT-2). Stimulation of HepG2 cells with RBP4 strongly up-regulated the expression of transcriptional coactivator peroxisome proliferator-activated receptor-γ coactivator 1β (PGC-1β) at both the messenger RNA (mRNA) and protein levels. The transcriptional activation of PGC-1β is necessary and sufficient for the transcriptional activation of SREBP-1 in response to RBP4. The cyclic adenosine monophosphate (cAMP)-response element binding protein (CREB) was identified as the target transcription factor involved in the RBP4-mediated up-regulation of PGC-1β transcription as a result of phosphorylation on Ser133. Furthermore, in vivo RBP4 infusion induced SREBP-1c activation and consequently accelerated hepatic lipogenesis and plasma TAG in C57BL/6J mice, a phenomenon not observed in Ppargc1b knockout mice. Conclusion: These findings reveal a novel mechanism by which RBP4 achieves its effects on hepatic lipid metabolism. (HEPATOLOGY 2013;8:564-575)" @default.
- W2133308052 created "2016-06-24" @default.
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- W2133308052 date "2013-06-14" @default.
- W2133308052 modified "2023-10-15" @default.
- W2133308052 title "Retinol binding protein 4 stimulates hepatic sterol regulatory element-binding protein 1 and increases lipogenesis through the peroxisome proliferator-activated receptor-γ coactivator 1β-dependent pathway" @default.
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- W2133308052 doi "https://doi.org/10.1002/hep.26227" @default.
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