title: The density of extracellular matrix proteins regulates inflammation and insulin signaling in adipocytes.
abstract: Cells can not only sense the type of extracellular matrix (ECM) protein that is present in the microenvironment, but they can also sense its density. Here, we investigated the effects of ECM protein density on adipokine secretion and insulin signaling in adipocytes. To this end, 3T3-L1 adipocytes were cultured on the surface of polyacrylamide gels that were coated with gradient densities of a collagen type I and fibronectin mixture. We found that high density ECM causes a decrease in insulin signaling and adiponectin secretion, whereas the secretion of monocyte chemoattractant protein-1 (MCP-1) was increased via the activation of nuclear factor-κB (NF-κB). These results indicate that the density of the ECM directly regulates the inflammatory response and insulin sensitivity of adipocytes.
authors.affiliation: Clinical Research Center for Diabetes, Tokushima University Hospital, Tokushima, Japan. lqk@clin.med.tokushima-u.ac.jp
authors.forename: Qinkai
authors.initials: Q
authors.lastname: Li
authors.forename: Akiko
authors.initials: A
authors.lastname: Hata
authors.forename: Chisato
authors.initials: C
authors.lastname: Kosugi
authors.forename: Nananko
authors.initials: N
authors.lastname: Kataoka
authors.forename: Makoto
authors.initials: M
authors.lastname: Funaki
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000378:metabolism*; D052242:Adiponectin / Q000378:metabolism; D000818:Animals; D018932:Chemokine CCL2 / Q000378:metabolism; D016326:Extracellular Matrix Proteins / Q000378:metabolism*; D007249:Inflammation / Q000378:metabolism*; D007328:Insulin / Q000378:metabolism*; D007333:Insulin Resistance; D051379:Mice; D016328:NF-kappa B / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D052242:Adiponectin; C499919:Adipoq protein, mouse; C491768:Ccl2 protein, mouse; D018932:Chemokine CCL2; D016326:Extracellular Matrix Proteins; D007328:Insulin; D016328:NF-kappa B