title: Inhibition of fatty acid synthase prevents preadipocyte differentiation.
abstract: Inhibition of fatty acid synthase (FAS) reduces food intake in rodents. As adipose tissue expresses FAS, we sought to investigate the effect of reduced FAS activity on adipocyte differentiation. FAS activity was suppressed either pharmacologically or by siRNA during differentiation of 3T3-L1 cells. Cerulenin (10 microM), triclosan (50 microM), and C75 (50 microM) reduced dramatically visible lipid droplet accumulation, while incorporation of [1-(14C)]acetate into lipids was reduced by 75%, 70%, and 90%, respectively. Additionally, the substances reduced FAS, CEBPalpha, and PPARgamma mRNA by up to 85% compared to that of control differentiated cells. Transient transfection with FAS siRNA suppressed FAS mRNA and FAS activity, and this was accompanied by reduction of CEBPalpha and PPARgamma mRNA levels, and complete prevention of lipid accumulation. CD36, a late marker of differentiation, was also reduced. Together, these results suggest that FAS generated signals may be essential to support preadipocyte differentiation.
authors.affiliation: Department of Metabolic Diseases, Boehringer Ingelheim Pharma GmbH and Co KG, 88397 Biberach an der Riss, Germany. Bernhard.Schmid@bc.boehringer-ingelheim.com
authors.forename: Bernhard
authors.initials: B
authors.lastname: Schmid
authors.forename: Jörg F
authors.initials: JF
authors.lastname: Rippmann
authors.forename: Moh
authors.initials: M
authors.lastname: Tadayyon
authors.forename: Bradford S
authors.initials: BS
authors.lastname: Hamilton
mesh_terms: D041721:3T3-L1 Cells; D015107:4-Butyrolactone / Q000031:analogs & derivatives* / Q000494:pharmacology; D017667:Adipocytes / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology*; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects* / Q000502:physiology; D002569:Cerulenin / Q000494:pharmacology; D064429:Fatty Acid Synthases / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism*; D020868:Gene Silencing; D051379:Mice; D014260:Triclosan / Q000494:pharmacology
chemical_list: C406734:4-methylene-2-octyl-5-oxofuran-3-carboxylic acid; D002569:Cerulenin; D014260:Triclosan; D064429:Fatty Acid Synthases; D015107:4-Butyrolactone