Abstract
The highly prevalent metabolic syndrome (insulin resistance, type 2 diabetes, dyslipidemia, hypertension, along with abdominal obesity) resembles Cushing's syndrome. However, in simple obesity, plasma cortisol levels are not elevated. 11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1), at least in mature adipocytes and hepatocytes, converts inactive circulating 11-keto steroids into active glucocorticoids, amplifying local glucocorticoid action. 11beta-HSD1 is elevated in adipose tissue in obese humans and rodents, suggesting that adipose tissue glucocorticoid excess may explain the conundrum. Indeed, transgenic mice overexpressing 11beta-HSD1 in adipose tissue faithfully replicate the metabolic syndrome. Conversely, 11beta-HSD1(-/-) mice resist the metabolic consequences of stress and high-fat feeding via insulin sensitisation and other advantageous effects in the liver and adipose tissue. Adipose 11beta-HSD1 deficiency contributes to a protective metabolic phenotype, supporting its role as a therapeutic target for the metabolic syndrome.
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