Cholesterol is increased in the exofacial leaflet of synaptic plasma membranes of human apolipoprotein E4 knock-in mice

Neuroreport
Hideki HayashiKatsuhiko Yanagisawa

Abstract

Inheritance of the apolipoprotein (apoE) epsilon4 allele is a risk factor for developing Alzheimer's disease (AD). The purpose of the present study was to determine effects of apoE-isoforms on the transbilayer distribution of cholesterol in synaptic plasma membranes (SPM) using mice expressing human apoE3 and apoE4. Total SPM cholesterol levels did not differ among the wild-type and apoE3 and apoE4 knock-in mice. However, a striking difference was observed in the transbilayer distribution of SPM cholesterol. ApoE4 knock-in mice showed an approximately 2-fold increase in exofacial leaflet cholesterol compared with apoE3 knock-in mice and wild-type mice. The results of this study suggest that pathogenic effects of apoE4 on AD development could be closely linked to alteration of cholesterol distribution in SPM.

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