Published online before print April 25, 2002, doi: 10.1161/01.ATV.0000019404.65403.71
© 2002 American Heart Association, Inc.
Atherosclerosis and Lipoproteins |
Respiratory Uncoupling Lowers Blood Pressure Through a Leptin-Dependent Mechanism in Genetically Obese Mice
From the Departments of Medicine and Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Mo.
Correspondence to Clay F. Semenkovich, Washington University School of Medicine, Campus Box 8046, 660 South Euclid Ave, St. Louis, MO 63110. E-mail semenkov{at}im.wustl.edu
Abstract— Insulin resistance is commonly associated with hypertension, a condition that causes vascular disease in people with obesity and type 2 diabetes. The mechanisms linking hypertension and insulin resistance are poorly understood. To determine whether respiratory uncoupling can prevent insulin resistance-related hypertension, we crossed transgenic mice expressing uncoupling protein 1 (UCP1) in skeletal muscle with lethal yellow (Ay/a) mice, genetically obese animals known to have elevated blood pressure. Despite increased food intake, UCP-Ay/a mice weighed less than their Ay/a littermates. The metabolic rate was higher in UCP-Ay/a mice than in Ay/a mice and did not impair their ability to alter oxygen consumption in response to temperature changes, an adaptation involving sympathetic nervous system activity. Compared with their nontransgenic littermates, UCP-Ay/a mice had lower fasting insulin, glucose, triglyceride, and cholesterol levels and were more insulin sensitive. Blood pressure, serum leptin, and urinary catecholamine levels were also lower in uncoupled mice. Independent of sympathetic nervous system activity, low-dose peripheral leptin infusion increased blood pressure in UCP-Ay/a mice but not in their Ay/a littermates. These data indicate that skeletal muscle respiratory uncoupling reverses insulin resistance and lowers blood pressure in genetic obesity without affecting thermoregulation. The data also suggest that uncoupling could decrease the risk of atherosclerosis in type 2 diabetes.
Key Words: insulin resistance • hypertension • energy metabolism • uncoupling proteins • type 2 diabetes
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