Peroxisome proliferator-activated receptor-beta signaling contributes to enhanced proliferation of hepatic stellate cells.

Détails

ID Serval
serval:BIB_4389ED775A1C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Peroxisome proliferator-activated receptor-beta signaling contributes to enhanced proliferation of hepatic stellate cells.
Périodique
Gastroenterology
Auteur⸱e⸱s
Hellemans K., Michalik L., Dittie A., Knorr A., Rombouts K., De Jong J., Heirman C., Quartier E., Schuit F., Wahli W., Geerts A.
ISSN
0016-5085
Statut éditorial
Publié
Date de publication
2003
Peer-reviewed
Oui
Volume
124
Numéro
1
Pages
184-201
Langue
anglais
Résumé
BACKGROUND & AIMS: The peroxisome proliferator-activated nuclear receptors (PPAR-alpha, PPAR-beta, and PPAR-gamma), which modulate the expression of genes involved in energy homeostasis, cell cycle, and immune function, may play a role in hepatic stellate cell activation. Previous studies focused on the decreased expression of PPAR-gamma in hepatic stellate cell activation but did not investigate the expression and role of the PPAR-alpha and -beta isotypes. The aim of this study was to evaluate the expression of the different PPARs during hepatic stellate cell activation in vitro and in situ and to analyze possible factors that might contribute to their expression. In a second part of the study, the effect of a PPAR-beta agonist on acute liver injury was evaluated. METHODS: The effects of PPAR isotype-specific ligands on hepatic stellate cell transition were evaluated by bromodeoxyuridine incorporation, gel shifts, immunoprecipitation, and use of antisense PPAR-beta RNA-expressing adenoviruses. Tumor necrosis factor alpha-induced PPAR-beta phosphorylation and expression was evaluated by metabolic labeling and by using specific P38 inhibitors. RESULTS: Hepatic stellate cells constitutively express high levels of PPAR-beta, which become further induced during culture activation and in vivo fibrogenesis. No significant expression of PPAR-alpha or -gamma was found. Stimulation of the P38 mitogen-activated protein kinase pathway modulated the expression of PPAR-beta. Transcriptional activation of PPAR-beta by L165041 enhanced hepatic stellate cell proliferation. Treatment of rats with a single bolus of CCl(4) in combination with L165041 further enhanced the expression of fibrotic markers. CONCLUSIONS: PPAR-beta is an important signal-transducing factor contributing to hepatic stellate cell proliferation during acute and chronic liver inflammation.
Mots-clé
Acute Disease, Adenoviridae, Animals, Antisense Elements (Genetics), Carbon Tetrachloride, Carrier Proteins, Cell Differentiation, Cell Division, Cyclooxygenase 2, DNA, Extracellular Matrix, Fatty Acid-Binding Proteins, Genetic Vectors, Isoenzymes, Liver, Liver Cirrhosis, Liver Cirrhosis, Alcoholic, Liver Diseases, Male, Mitogen-Activated Protein Kinases, Neoplasm Proteins, Nerve Tissue Proteins, Prostaglandin-Endoperoxide Synthases, Protein Isoforms, RNA, Messenger, Rats, Rats, Wistar, Receptors, Cytoplasmic and Nuclear, Signal Transduction, Transcription Factors, p38 Mitogen-Activated Protein Kinases
Pubmed
Web of science
Création de la notice
24/01/2008 16:44
Dernière modification de la notice
20/08/2019 14:47
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