Journal
JOURNAL OF ENDOCRINOLOGY
Volume 194, Issue 2, Pages 275-281Publisher
BIOSCIENTIFICA LTD
DOI: 10.1677/JOE-07-0133
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C-reactive protein (CRP) is considered as one of the most sensitive markers of inflammation. The aim of the present Study is to investigate the effects of CRP on the production of adiponectin in 3T3-L1 adipocytes. Northern and western blot analysis revealed that CRP treatment inhibited adiponectin mRNA expression and secretion in a dose- and time-dependent manner. Co-incubation of adipocytes with rosightazone and CRP decreased induction of adiponectin gene expression by rosightazone. However, luciferase reporter assays did not show that CRP affected the activity of similar to 2.1 kb adiponectin gene promoter, which was increased by rosiglitazone alone. Pharmacological inhibition of phosphatidylinositol (PI)-3 kinase by LY294002 partially reversed inhibition of adiponectin gene expression by CRP These results collectively suggest that CRP suppresses adiponectin gene expression partially through the PI-3 kinase pathway, and that decreased production of adiponectin might represent a mechanism by which CRP regulates insulin sensitivity.
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