Lipodystrophy: lessons in lipid and energy metabolism

Current Opinion in Lipidology
Vinaya Simha, Abhimanyu Garg

Abstract

Lipodystrophies are rare inherited and acquired disorders characterized by the selective loss of adipose tissue. Despite marked phenotypic and genotypic heterogeneity, most lipodystrophic syndromes predispose to similar metabolic complications seen in patients with obesity, such as insulin resistance, diabetes mellitus, hepatic steatosis and dyslipidemia. The purpose of this review is to highlight the current understanding of the mechanisms underlying dyslipidemia in patients with lipodystrophies. Marked hypertriglyceridemia and reduced levels of high-density lipoprotein cholesterol are commonly seen, and the severity of these metabolic abnormalities seems to be related to the extent of fat loss. The precise mechanisms by which the lack of adipose tissue causes hypertriglyceridemia remain unknown. Anecdotal kinetic studies in hyperglycemic patients with lipodystrophies have revealed accelerated lipolysis and increased free fatty acid turnover, which drives hepatic triglyceride and very low-density lipoprotein synthesis. Other mechanisms may also be involved in causing dyslipidemia and ectopic triglyceride accumulation in the liver and skeletal muscles that remain to be identified. Understanding the pathophysiology of dyslipidem...Continue Reading

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