Abstract:
: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.
journal_name
J Lipid Resjournal_title
Journal of lipid researchauthors
Hellemans K,Rombouts K,Quartier E,Dittié AS,Knorr A,Michalik L,Rogiers V,Schuit F,Wahli W,Geerts Adoi
10.1194/jlr.M200376-JLR200keywords:
subject
Has Abstractpub_date
2003-02-01 00:00:00pages
280-95issue
2eissn
0022-2275issn
1539-7262pii
M200376-JLR200journal_volume
44pub_type
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journal_title:Journal of lipid research
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journal_title:Journal of lipid research
pub_type: 杂志文章
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journal_title:Journal of lipid research
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doi:
更新日期:1999-07-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
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更新日期:1992-11-01 00:00:00
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journal_title:Journal of lipid research
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
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journal_title:Journal of lipid research
pub_type: 杂志文章
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更新日期:1996-03-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1998-11-01 00:00:00
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