Isoproterenol stimulates monocyte chemoattractant protein-1 expression and secretion in 3T3-L1 adipocytes

Regulatory Peptides
Susan KralischM Fasshauer

Abstract

Recently, monocyte chemoattractant protein (MCP)-1 has been characterized as a novel adipocytokine upregulated in obesity and insulin resistance which impairs insulin signaling in muscle and fat in vitro. Growing evidence, on the other hand, suggests that increased activity of the sympathetic nervous system is an integral part in the development of insulin resistance. In the current study, the impact of the beta-adrenergic agonist isoproterenol on MCP-1 mRNA synthesis and secretion was determined in 3T3-L1 adipocytes. Interestingly, isoproterenol increased MCP-1 secretion 3-fold. Furthermore, 10 microM isoproterenol acutely induced MCP-1 mRNA by up to 5.3-fold in a time-dependent fashion with significant stimulation seen at concentrations as low as 0.3 microM effector. Studies using pharmacological inhibitors suggested that basal and isoproterenol-induced MCP-1 expressions are mediated via beta-adrenergic receptors and protein kinase A. Moreover, acute activation of adenylyl cyclase by forskolin was sufficient to mimic the effects of isoproterenol. Taken together, our results demonstrate that isoproterenol induces MCP-1 expression and secretion via a classical GS-protein-coupled pathway and support the notion that MCP-1 might b...Continue Reading

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Citations

Dec 17, 2010·Archives of Physiology and Biochemistry·Paul TrayhurnJürgen Eckel
Feb 24, 2009·Regulatory Peptides·Susan KralischMathias Fasshauer
May 15, 2007·Current Opinion in Lipidology·Henrike Sell, Jürgen Eckel
Nov 18, 2010·Physiological Genomics·Nicky KonstantopoulosKen R Walder
Aug 30, 2007·American Journal of Physiology. Endocrinology and Metabolism·Hui Ren ZhouKate J Claycombe
Oct 28, 2010·American Journal of Physiology. Endocrinology and Metabolism·Ya-Yu WangWayne Huey-Herng Sheu
Feb 26, 2016·Animal Biotechnology·Mona A M GhoneimMohsen S Asker

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