Literature DB >> 19088433

Transcriptional regulation of HMG-CoA synthase and HMG-CoA reductase genes by human ACBP.

Christina Vock1, Frank Döring, Inke Nitz.   

Abstract

The acyl-CoA binding protein (ACBP) is an ubiquitary expressed multi-functional protein which regulates basic cellular functions such as fatty acid and steroid metabolism. Since ACBP is described to interact with the transcription factor hepatocyte nuclear factor 4 alpha (HNF-4alpha), we investigated the role of human ACBP on transcriptional regulation of the putative HNF-4alpha target gene HMG-CoA synthase 1 (HMGCS1). As shown by promoter-reporter assays ACBP represses the HNF-4alpha-induced activity of a 617bp HMGCS1 promoter fragment by approximately 80% in HepG2 cells as well as in non-endodermal HeLa cells devoid of HNF-4alpha. Interestingly, reporter assays without co-transfection of HNF-4alpha revealed that ACBP reduces the activity of the HMGCS1 promoter by about 60 to 80% in both cell lines. Activities of 417bp and 317bp HMGCS1 promoter fragments were 2.5 to 4 fold decreased by ACBP. Concordantly, the levels of HMGCS1-mRNA and -protein were diminished to 60% and 70% in ACBP-expressing HeLa cells, respectively. Additionally, ACBP reduces the promoter activity and the mRNA levels of the cholesterogenic HMG-CoA reductase (HMGCR). In conclusion, we provide evidence that ACBP is a transcriptional regulator of the HMGCS1 and HMGCR genes encoding rate-limiting enzymes of cholesterol synthesis pathway. Copyright 2008 S. Karger AG, Basel.

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Year:  2008        PMID: 19088433     DOI: 10.1159/000185525

Source DB:  PubMed          Journal:  Cell Physiol Biochem        ISSN: 1015-8987


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