title: Activation of diacylglycerol O-acyltransferase 1 gene results in increased tumor necrosis factor-alpha gene expression in 3T3-L1 adipocytes.
abstract: The tumor necrosis factor-alpha (TNF-alpha) expression has been reported to be largely dependent on the size of adipocytes. We herein investigated the gene regulation of diacylglycerol O-acyltransferase (DGAT) in order to clarify the mechanism of TNF-alpha expression induced in large adipocytes. 3T3-L1 cells were cultured in the presence of 5 mM or 25 mM glucose to generate adipocytes from which the triglyceride content differs. The expression of TNF-alpha, DGAT1, and DGAT2 were upregulated in adipocytes cultured with 25 mM glucose. Furthermore, knockdown of DGAT1 gene significantly inhibited the TNF-alpha expression. Finally, the DGAT1 expression levels were closely related to the TNF-alpha level in 3T3-L1 adipocytes.
authors.affiliation: Department of Geriatric Pharmacology and Therapeutics, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Hirata
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Unoki
authors.forename: Hideaki
authors.initials: H
authors.lastname: Bujo
authors.forename: Koichi
authors.initials: K
authors.lastname: Ueno
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Saito
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000166:cytology / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D000818:Animals; D002478:Cells, Cultured; D051048:Diacylglycerol O-Acyltransferase / Q000235:genetics* / Q000378:metabolism*; D004790:Enzyme Induction / Q000187:drug effects; D005947:Glucose / Q000494:pharmacology; D051379:Mice; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism; D014280:Triglycerides / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D012333:RNA, Messenger; D034741:RNA, Small Interfering; D014280:Triglycerides; D014409:Tumor Necrosis Factor-alpha; D051048:Diacylglycerol O-Acyltransferase; D005947:Glucose