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PPARbeta regulates vitamin A metabolism-related gene expression in hepatic stellate cells undergoing activation.

Authors: Hellemans, K  Rombouts, K  Quartier, E  Dittie, AS  Knorr, A  Michalik, L  Rogiers, V  Schuit, F  Wahli, W  Geerts, A 
Citation: Hellemans K, etal., J Lipid Res. 2003 Feb;44(2):280-95. Epub 2002 Nov 16.
Pubmed: (View Article at PubMed) PMID:12576510
DOI: Full-text: DOI:10.1194/jlr.M200376-JLR200

Activation of cultured hepatic stellate cells correlated with an enhanced expression of proteins involved in uptake and storage of fatty acids (FA translocase CD36, Acyl-CoA synthetase 2) and retinol (cellular retinol binding protein type I, CRBP-I; lecithin:retinol acyltransferases, LRAT). The increased expression of CRBP-I and LRAT during hepatic stellate cells activation, both involved in retinol esterification, was in contrast with the simultaneous depletion of their typical lipid-vitamin A (vitA) reserves. Since hepatic stellate cells express high levels of peroxisome proliferator activated receptor beta (PPARbeta), which become further induced during transition into the activated phenotype, we investigated the potential role of PPARbeta in the regulation of these changes. Administration of L165041, a PPARbeta-specific agonist, further induced the expression of CD36, B-FABP, CRBP-I, and LRAT, whereas their expression was inhibited by antisense PPARbeta mRNA. PPARbeta-RXR dimers bound to CRBP-I promoter sequences. Our observations suggest that PPARbeta regulates the expression of these genes, and thus could play an important role in vitA storage. In vivo, we observed a striking association between the enhanced expression of PPARbeta and CRBP-I in activated myofibroblast-like hepatic stellate cells and the manifestation of vitA autofluorescent droplets in the fibrotic septa after injury with CCl4 or CCl4 in combination with retinol.

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CRRD Object Information
CRRD ID: 1625187
Created: 2007-05-28
Species: All species
Last Modified: 2007-05-28
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.