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(The FASEB Journal. 2001;15:312-321.)
© 2001 FASEB

Diseases of liporegulation: new perspective on obesity and related disorders

ROGER H. UNGER*,{dagger}1 and LELIO ORCI{ddagger}

* Gifford Laboratories, Touchstone Center for Diabetes Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390-8854, USA;
{dagger} Veterans Affairs North Texas Health Care System, Dallas, Texas, USA; and
{ddagger} Department of Morphology, University of Geneva Medical School, Geneva, Switzerland

1Correspondence: Gifford Laboratories, Touchstone Center for Diabetes Research, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-8854, USA. E-mail: runger{at}mednet.swmed.edu

Obesity-related diseases now threaten to reach epidemic proportions in the United States. Here we review in a rodent model of genetic obesity, the fa/fa Zucker diabetic fatty (ZDF) rat, the mechanisms involved in the most common complications of diet-induced human obesity, i.e., noninsulin-dependent diabetes mellitus, and myocardial dysfunction. In ZDF rats, hyperphagia leads to hyperinsulinemia, which up-regulates transcription factors that stimulate lipogenesis. This causes ectopic deposition of triacylglycerol in nonadipocytes, providing fatty acid (FA) substrate for damaging pathways of nonoxidative metabolism, such as ceramide synthesis. In ß cells and myocardium, the resulting functional impairment and apoptosis cause diabetes and cardiomyopathy. Interventions that lower ectopic lipid accumulation or block nonoxidative metabolism of FA and ceramide formation completely prevent these complications. Given the evidence for a similar etiology for the complications of human obesity, it would be appropriate to develop strategies to avert the predicted epidemic of lipotoxic disorders.—Unger, R. H., Orci, L. Diseases of lipid overflow: new perspective on obesity and related disorders.


Key Words: lipotoxicity • lipoapoptosis • complications of obesity • noninsulin-dependent diabetes • cardiomyopathy




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