Martin Merkel, Joerg Heeren
J Clin Invest.
2005;
115(10):2694–2696
doi:10.1172/JCI26712
This article Copyright © 2005, The American Society for Clinical Investigation
Abstract
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POA5 is a newly identified apolipoprotein that plays a crucial role in the regulation of plasma triglyceride levels. In several human studies, common APOA5 single nucleotide polymorphisms have been strongly associated with elevated plasma triglyceride levels. In this issue of the JCI, Marçais et al. report that the rare Q139X mutation in APOA5 leads to severe hypertriglyceridemia by exerting a dominant-negative effect on the plasma lipolytic system for triglyceride-rich lipoproteins. The presented data support the idea that the molecular mechanism of APOA5 function may include the enhancement of binding between lipoproteins and proteoglycans at the vascular wall and activation of proteoglycan-bound lipoprotein lipase.
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