Hyperlipidemia in APOE2 transgenic mice is ameliorated by a truncated apoE variant lacking the C-terminal domain

• Main Authors: Gery Gerritsen, Kyriakos E. Kypreos, André van der Zee, Bas Teusink, Vassilis I. Zannis, Louis M. Havekes, Ko Willems van Dijk
• Format: Article
• Language: English
• Published: Elsevier 2003-02-01
• Series: Journal of Lipid Research
• Subjects: familial dysbetalipoproteinemia; adenovirus-mediated gene transfer; hypertriglyceridemia; apolipoprotein E
• Online Access: http://www.sciencedirect.com/science/article/pii/S0022227520312281

Familial dysbetalipoproteinemia associated with the apolipoprotein E2 (APOE2) genotype is a recessive disorder with low penetrance. We have investigated whether additional expression of full-length APOE3, APOE4, or a truncated variant of APOE4 (APOE4-202) can reduce APOE2- associated hyperlipidemia. This was achieved using adenovirus-mediated gene transfer to mice transgenic for human APOE2 and deficient for endogenous Apoe (APOE2.Apoe−/− mice). The hyperlipidemia of APOE2.Apoe−/− mice was readily aggravated by APOE3 and APOE4 overexpression. Only a very low dose of APOE4 adenovirus was capable of reducing the serum cholesterol and triglyceride (TG) levels. Expression of higher doses of APOE4 was associated with an increased VLDL-TG production rate and the accumulation of TG-rich VLDL in the circulation. In contrast, a high dose of adenovirus carrying APOE4-202 reduced both the cholesterol and TG levels in APOE2.Apoe−/− mice. Despite the absence of the C-terminal lipid-binding domain, APOE4-202 is apparently capable of binding to lipoproteins and mediating hepatic uptake. Moreover, overexpression of APOE4-202 in APOE2.Apoe−/− mice does not aggravate their hypertriglyceridemia. These results extend our previous analyses of APOE4-202 expression in Apoe−/− mice and demonstrate that apoE4-202 functions even in the presence of clearance-defective apoE2.Thus, apoE4-202 is a safe and efficient candidate for future therapeutic applications.