Cited by 4Cholesterol and Lipid MetabolismLipid metabolism and disordersLipoproteins and Cardiovascular Health

apoE3[K146N/R147W] acts as a dominant negative apoE form that prevents remnant clearance and inhibits the biogenesis of HDL

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Fotakis, Panagiotis, Vezeridis, Alexander, Dafnis, Ioannis, Chroni, Angeliki, Kardassis, Dimitris, Zannis, Vassilis I.·2014·Journal of Lipid Research

Abstract

The K146N/R147W substitutions in apoE3 were described in patients with a dominant form of type III hyperlipoproteinemia. The effects of these mutations on the in vivo functions of apoE were studied by adenovirus-mediated gene transfer in different mouse models. Expression of the apoE3[K146N/R147W] mutant in apoE-deficient (apoE(-/-)) or apoA-I-deficient (apoA-I(-/-))×apoE(-/-) mice exacerbated the hypercholesterolemia and increased plasma apoE and triglyceride levels. In apoE(-/-) mice, the apoE3[K146N/R147W] mutant displaced apoA-I from the VLDL/LDL/HDL region and caused the accumulation of discoidal apoE-containing HDL. The WT apoE3 cleared the cholesterol of apoE(-/-) mice without induction of hypertriglyceridemia and promoted formation of spherical HDL. A unique property of the truncated apoE3[K146N/R147W]202 mutant, compared with similarly truncated apoE forms, is that it did not correct the hypercholesterolemia. The contribution of LPL and LCAT in the induction of the dyslipidemia was studied. Treatment of apoE(-/-) mice with apoE3[K146N/R147W] and LPL corrected the hypertriglyceridemia, but did not prevent the formation of discoidal HDL. Treatment with LCAT corrected hypertriglyceridemia and generated spherical HDL. The combined data indicate that the K146N/R147W substitutions convert the full-length and the truncated apoE3[K146N/R147W] mutant into a dominant negative ligand that prevents receptor-mediated remnant clearance, exacerbates the dyslipidemia, and inhibits the biogenesis of HDL.

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Crossref · 10.1194/jlr.m048348

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Authors
Fotakis, P., Vezeridis, A., Dafnis, I., Chroni, A., Kardassis, D., & Zannis, V. I.
Affiliations
  • Boston University (US)
  • National Centre of Scientific Research "Demokritos" (GR)
  • University of Crete (GR)
Corresponding author
Zannis, Vassilis I.
Venue
Journal of Lipid Research
Publisher
Elsevier BV
Published
2014-07
Volume
55
Issue
7
Pages
1310-1323
ISSN
0022-2275 (ISSN-L)
OpenAlex
W2168031690
Cited by
4
References
68
Citations by year
2015: 3 · 2014: 1
FWCI
1.32
Type
journal article
Language
en
Open access
Locations
  • Journal of Lipid Research (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Heart, Lung, and Blood Institute (R01HL068216)
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
Keywords
apolipoprotein E, dominant negative mutation, type III hyperlipoproteinemia, HDL biogenesis, discoidal HDL, hypercholesterolemia, hypertriglyceridemia, ApoE-deficient mice, apolipoprotein A-I, lipoprotein lipase
MeSH terms
Animals, Female, Phosphatidylcholine-Sterol O-Acyltransferase, Lipoprotein Lipase, Lipoproteins, HDL, Male, Hypertriglyceridemia, Mice, Knockout, Amino Acid Substitution, Mutation, Missense, Mice, Apolipoprotein E3

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