Deficiency of Adrenomedullin Induces Insulin Resistance by Increasing Oxidative Stress
- 1 May 2003
- journal article
- research article
- Published by Wolters Kluwer Health in Hypertension
- Vol. 41 (5) , 1080-1085
- https://doi.org/10.1161/01.hyp.0000066846.46422.2c
Abstract
Hypertension, insulin resistance, and obesity are common age-related metabolic disorders that are often associated with increased oxidative stress and the resultant vascular damage. Underlying mechanisms have been suggested, and age-related overproduction of oxidative stress is one possible candidate. Since we recently found a vasoactive peptide, adrenomedullin, to be an endogenous antioxidant that potently inhibits oxidative stress–induced vascular damage, in the current study we evaluated oxidative stress–induced changes in aged mice. Insulin sensitivities in young and aged adrenomedullin-deficient mice were measured by means of the hyperinsulinemic-euglycemic clamp method; insulin resistance was apparent in aged adrenomedullin-deficient mice with increased urinary excretion of 8-iso-prostaglandin F2α, a marker of oxidative stress, but not in young adrenomedullin-deficient mice. Concomitantly, only aged adrenomedullin-deficient mice not only showed increased production of muscular reactive oxygen specie...Keywords
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