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Angiopoietin-like 3 (ANGPTL3) is a secreted protein with both angiogenesis and lipid metabolism functions. We generated knockout mice that failed to express the Angptl3 gene, and analyzed the lipid metabolism. Angptl3-null mice, fed a normal diet or a high-fat, high-calorie (HFC) diet, revealed markedly low plasma lipid concentrations, especially plasma triglyceride concentration, although the body weight and liver weight were not different between Angptl3-null mice and wild-type mice. Angptl3-null mice fed an HFC diet also revealed a significantly reduced epididymal adipose tissue weight despite there being no difference in adipocyte size between them and wild-type mice. A triglyceride clearance study indicated that the lower plasma triglyceride concentration in Angptl3-null mice was caused by an accelerated clearance of triglyceride. In fact, lipoprotein lipase and hepatic lipase activities in the post-heparin plasma of Angptl3-null mice were 1.57 times and 1.42 times higher than those of wild-type mice, respectively. These results suggest that ANGPTL3 may have an effect not only on lipid metabolism but also on adipose formation.

Angptl3-null Mice Show Low Plasma Lipid Concentrations by Enhanced Lipoprotein Lipase Activity