title: Tissue inhibitor of metalloproteinase-1 mRNA production and protein secretion are induced by interleukin-1 beta in 3T3-L1 adipocytes.
abstract: The adipokine tissue inhibitor of metalloproteinase (TIMP)-1 is upregulated when weight is gained and promotes adipose tissue development. In the present study, the effect of insulin resistance-inducing and proinflammatory interleukin (IL)-1 beta on TIMP-1 gene expression and secretion was investigated in 3T3-L1 adipocytes. Interestingly, protein secretion and mRNA production of TIMP-1 were significantly stimulated by IL-1 beta. Thus, IL-1 beta induced TIMP-1 secretion in a dose-dependent manner with maximal 3.5-fold upregulation seen at 0.67 ng/ml IL-1 beta relative to untreated cells. Furthermore, TIMP-1 mRNA synthesis was significantly stimulated by IL-1 beta in a dose-dependent fashion with 2.5-fold induction seen at IL-1 beta concentrations as low as 0.02 ng/ml and maximal 8.1-fold upregulation found at 20 ng/ml effector. Induction of TIMP-1 mRNA was also time dependent with maximal 9.6-fold upregulation detectable after 8 h of IL-1 beta treatment. Signaling studies suggested that janus kinase 2 is involved in IL-1 beta-induced TIMP-1 mRNA expression. Taken together, our results demonstrate that the TIMP-1 expression is selectively upregulated by proinflammatory IL-1 beta, supporting a direct association between insulin resistance, inflammation, and adipose tissue development in obesity.
authors.affiliation: Department of Internal Medicine III, University of Leipzig, 04103 Leipzig, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Weise
authors.forename: Susan
authors.initials: S
authors.lastname: Kralisch
authors.forename: Grit
authors.initials: G
authors.lastname: Sommer
authors.forename: Ulrike
authors.initials: U
authors.lastname: Lossner
authors.forename: Matthias
authors.initials: M
authors.lastname: Bluher
authors.forename: Michael
authors.initials: M
authors.lastname: Stumvoll
authors.forename: Mathias
authors.initials: M
authors.lastname: Fasshauer
mesh_terms: D041721:3T3-L1 Cells; D000818:Animals; D002454:Cell Differentiation; D004305:Dose-Response Relationship, Drug; D005786:Gene Expression Regulation / Q000187:drug effects; D053583:Interleukin-1beta / Q000494:pharmacology*; D015850:Interleukin-6 / Q000494:pharmacology; D051379:Mice; D012333:RNA, Messenger / Q000032:analysis*; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000235:genetics* / Q000378:metabolism; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000235:genetics; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D053583:Interleukin-1beta; D015850:Interleukin-6; D012333:RNA, Messenger; D019715:Tissue Inhibitor of Metalloproteinase-1; D014409:Tumor Necrosis Factor-alpha; D019716:Tissue Inhibitor of Metalloproteinase-2