Published online before print May 16, 2005, doi: 10.1161/01.HYP.0000165683.09053.02
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(Hypertension. 2005;45:1031.)
© 2005 American Heart Association, Inc.
Brief Reviews |
Hyperleptinemia
Protecting the Heart From Lipid Overload
From the Gifford Laboratories, Touchstone Center for Diabetes Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, and Veterans Affairs Medical Center, Dallas, Tex.
Correspondence to Roger H. Unger, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390-8854. E-mail roger.unger{at}utsouthwestern.edu
In this review, we attempt to deduce teleologically the physiological mission of leptin. Because overnutrition and diet-induced obesity are the only known causes of hyperleptinemia, we contrast the differences in overnutrition in normally leptinized rodents, in which the added lipids are confined to adipocytes, with those of unleptinized rodents, in which the added lipids are distributed in liver, pancreatic islets, and heart and skeletal muscle, causing organ dysfunction and cell death with a disease cluster resembling metabolic syndrome. We focus here on lipid-induced cardiac dysfunction and the remarkable ability of hyperleptinemia to prevent it. We conclude that the hyperleptinemia of overnutrition prevents the ectopic lipid deposition by: (1) acting on hypothalamic appetite centers to limit the caloric surplus to fit the available adipocyte storage capacity and, (2) upregulating of fatty acid oxidation and downregulating lipogenesis in peripheral tissues to minimize ectopic lipid deposition. The causes of failure of this system and its clinical consequences are discussed.
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