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Aldosterone perturbs adiponectin and PAI-1 expression and secretion in 3T3-L1 adipocytes.

Aldosterone is considered as a new cardiovascular risk factor that plays an important role in metabolic syndrome; however, the underlying mechanism of these effects is not clear. Hypoadiponectinemia and elevated circulating concentration of plasminogen activator inhibitor-1 (PAI-1) are causally associated with obesity-related insulin resistance and cardiovascular disease. The aim of the present study is to investigate the effect of aldosterone on the production of adiponectin and PAI-1 in 3T3-L1 adipocytes. Northern and Western blot analyses revealed that aldosterone treatment inhibited adiponectin mRNA expression and secretion and simultaneously enhanced PAI-1 mRNA expression and secretion in a time- and dose-dependent manner. Rosiglitazone did not prevent aldosterone's effect on adiponectin or PAI-1 expression. In contrast, tumor necrosis factor (TNF)-α produced dramatic synergistic effects on adiponectin and PAI-1 expression when added together with aldosterone. Furthermore, the effects of aldosterone on adiponectin and PAI-1 expression appear to be mediated through glucocorticoid receptor (GR) but not mineralocorticoid receptor (MR). These results suggest that the effects of aldosterone on adiponectin and PAI-1 production are one of the underlying mechanisms linking it to insulin resistance, metabolic syndrome and cardiovascular disease.