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Endocrinology. 2005 Nov;146(11):4943-50. Epub 2005 Aug 4.

Transgenic angiopoietin-like (angptl)4 overexpression and targeted disruption of angptl4 and angptl3: regulation of triglyceride metabolism.

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  • 1Lilly Research Laboratories, Eli Lilly & Company, Indianapolis, Indiana 46225, USA. koester_anja@lilly.com

Abstract

Lipoprotein lipase (LPL) is a key regulator of triglyceride clearance. Its coordinated regulation during feeding and fasting is critical for maintaining lipid homeostasis and energy supply. Angiopoietin-like (Angptl)3 and Angptl4 are secreted proteins that have been demonstrated to regulate triglyceride metabolism by inhibiting LPL. We have taken a targeted genetic approach to generate Angptl4- and Angptl3-deficient mice as well as transgenic mice overexpressing human Angptl4 in the liver. The Angptl4 transgenic mice displayed elevated plasma triglycerides and reduced postheparin plasma (PHP) LPL activity. A purified recombinant Angptl4 protein inhibited mouse LPL and recombinant human LPL activity in vitro. In contrast to the transgenic mice, Angptl4-deficient mice displayed hypotriglyceridemia and increased PHP LPL activity, with greater effects in the fasted compared with the fed state. Angptl3-deficient mice also displayed hypotriglyceridemia with elevated PHP LPL activity, but these mice showed a greater effect in the fed state. Mice deficient in both Angptl proteins showed an additive effect on plasma triglycerides and did not survive past 2 months of age. Our results show that Angptl3 and Angptl4 function to regulate circulating triglyceride levels during different nutritional states and therefore play a role in lipid metabolism during feeding/fasting through differential inhibition of LPL.

PMID:
16081640
[PubMed - indexed for MEDLINE]
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