title: Coffee inhibits adipocyte differentiation via inactivation of PPARγ.
abstract: Recent epidemiological studies showed that coffee consumption is associated with a lower risk of type 2 diabetes, presumably due to suppression of excess fat accumulation in adipocytes. However, the mechanism underlying the effect of coffee on adipocyte differentiation has not been well documented. To elucidate the mechanism, we investigated the effect of coffee on the differentiation of mouse preadipocyte 3T3-L1 cells. Coffee reduced the accumulation of lipids during adipocytic differentiation of 3T3-L1 cells. At 5% coffee, the accumulation of lipids decreased to half that of the control. Coffee also inhibited the expression of the peroxisome proliferator-activated receptor γ (PPARγ), a transcription factor controlling the differentiation of adipocytes. Furthermore, coffee reduced the expression of other differentiation marker genes, aP2, adiponectin, CCAAT-enhancer-binding protein α (C/EBPα), glucose transporter 4 (GLUT4), and lipoprotein lipase (LPL), during adipocyte differentiation. Major bioactive constituents in coffee extracts, such as caffeine, trigonelline, chlorogenic acid, and caffeic acid, showed no effect on PPARγ gene expression. The inhibitory activity was produced by the roasting of the coffee beans.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Keio University.
authors.forename: Ryohei
authors.initials: R
authors.lastname: Aoyagi
authors.forename: Megumi
authors.initials: M
authors.lastname: Funakoshi-Tago
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Fujiwara
authors.forename: Hiroomi
authors.initials: H
authors.lastname: Tamura
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D052242:Adiponectin / Q000235:genetics; D000818:Animals; D022762:CCAAT-Enhancer-Binding Proteins / Q000235:genetics; D002454:Cell Differentiation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D040503:Coffea; D050556:Fatty Acid-Binding Proteins / Q000235:genetics; D015870:Gene Expression / Q000187:drug effects; D051275:Glucose Transporter Type 4 / Q000235:genetics; D050356:Lipid Metabolism / Q000187:drug effects; D051379:Mice; D047495:PPAR gamma / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D010936:Plant Extracts / Q000494:pharmacology*
chemical_list: D052242:Adiponectin; C499919:Adipoq protein, mouse; D022762:CCAAT-Enhancer-Binding Proteins; C530718:CEBPA protein, mouse; C493411:Fabp4 protein, mouse; D050556:Fatty Acid-Binding Proteins; D051275:Glucose Transporter Type 4; D047495:PPAR gamma; D010936:Plant Extracts; C495693:Slc2a4 protein, mouse