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- W2009862783 abstract "Abstract Context: In animals, peroxisome proliferator-activated receptor-α (PPARα) and PPARγ agonists down-regulate 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) mRNA and activity in liver and adipose tissue, respectively, and PPARγ agonists reduce ACTH secretion from corticotrope cells. Objective: Our objective was to test whether PPAR agonists alter cortisol secretion and peripheral regeneration by 11β-HSD1 in humans and whether reduced cortisol action contributes to metabolic effects of PPARγ agonists. Design and Setting: Three randomized placebo-controlled crossover studies were conducted at a clinical research facility. Patients and Participants: Healthy men and patients with type 2 diabetes participated. Interventions, Outcome Measures, and Results: In nine healthy men, 7 d of PPARα agonist (fenofibrate) or PPARγ agonist (rosiglitazone) had no effect on cortisol secretion, hepatic cortisol generation after oral cortisone administration, or tracer kinetics during 9,11,12,12-[2H]4-cortisol infusion, although rosiglitazone marginally reduced cortisol generation in sc adipose tissue measured by in vivo microdialysis. In 12 healthy men, 4–5 wk of rosiglitazone increased insulin sensitivity during insulin infusion but did not change 11β-HSD1 mRNA or activity in sc adipose tissue, and insulin sensitization was unaffected by glucocorticoid blockade with a combination of metyrapone and RU38486. In 12 men with type 2 diabetes 12 wk of rosiglitazone reduced arteriovenous cortisone extraction across abdominal sc adipose tissue and reduced 11β-HSD1 mRNA in sc adipose tissue but increased plasma cortisol concentrations. Conclusions: Neither PPARα nor PPARγ agonists down-regulate 11β-HSD1 or cortisol secretion acutely in humans. The early insulin-sensitizing effect of rosiglitazone is not dependent on reducing intracellular glucocorticoid concentrations. Reduced adipose 11β-HSD1 expression and increased plasma cortisol during longer therapy with rosiglitazone probably reflect indirect effects, e.g. mediated by changes in body fat." @default.
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- W2009862783 date "2007-05-01" @default.
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- W2009862783 title "Effects of Peroxisome Proliferator-Activated Receptor-α and -γ Agonists on 11β-Hydroxysteroid Dehydrogenase Type 1 in Subcutaneous Adipose Tissue in Men" @default.
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- W2009862783 doi "https://doi.org/10.1210/jc.2006-2713" @default.
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