title: Celecoxib decreases fatty acid synthase expression via down-regulation of c-Jun N-terminal kinase-1.
abstract: Nonsteroidal anti-inflammatory drugs (NSAIDs) are inhibitors of cyclooxygenase (COX). Our previous observations that celecoxib, a COX-2-specific inhibitor, not only inhibits rat mammary carcinogenesis, but also decreases fat deposition in rats fed a high-fat diet, prompted us to determine whether celecoxib affects lipid metabolism. At 57 days of age, two groups of 10 female Sprague Dawley rats were pair-fed a high-fat diet with or without 1500 ppm celecoxib for 15 weeks. Compared with controls, celecoxib-treated rats had 44.4% less hepatic triglycerides and 22.6% less intra-abdominal adipose tissue mass. In the liver and adipose tissue of several genes involved in fat metabolism and mobilization that we measured, only fatty acid synthase (FAS) was significantly down-regulated by celecoxib treatment. There were no differences in the level of prostaglandin E(2) in these tissues, indicating that celecoxib decreases fat accumulation by down-regulating FAS through a COX-2-independent mechanism. Among the potential molecular targets by which celecoxib may regulate FAS expression, only c-Jun N-terminal kinase-1 (JNK1) was significantly down-regulated. Furthermore, a known inhibitor of JNK suppressed FAS expression in rat hepatocytes. Our observations suggest that celecoxib suppresses FAS expression and decreases fat accumulation by down-regulating JNK1.
authors.affiliation: Department of Nutritional Sciences, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Suying
authors.initials: S
authors.lastname: Lu
authors.forename: Michael C
authors.initials: MC
authors.lastname: Archer
mesh_terms: D000818:Animals; D000873:Anthracenes / Q000494:pharmacology; D015152:Blotting, Northern; D015153:Blotting, Western; D000068579:Celecoxib; D002478:Cells, Cultured; D052246:Cyclooxygenase 2 Inhibitors / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation / Q000187:drug effects; D064429:Fatty Acid Synthases / Q000235:genetics* / Q000378:metabolism; D005260:Female; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D022781:Hepatocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D050152:Intra-Abdominal Fat / Q000187:drug effects / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D048055:Mitogen-Activated Protein Kinase 8 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D011720:Pyrazoles / Q000494:pharmacology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013449:Sulfonamides / Q000494:pharmacology*; D014280:Triglycerides / Q000378:metabolism
chemical_list: D000873:Anthracenes; D052246:Cyclooxygenase 2 Inhibitors; D011720:Pyrazoles; D012333:RNA, Messenger; D013449:Sulfonamides; D014280:Triglycerides; C432165:pyrazolanthrone; D064429:Fatty Acid Synthases; D048055:Mitogen-Activated Protein Kinase 8; D000068579:Celecoxib