Apolipoprotein E-containing high density lipoprotein promotes neurite outgrowth and is a ligand for the low density lipoprotein receptor-related protein.

The Journal of Biological Chemistry
A M FaganD M Holtzman

Abstract

Presence of the epsilon4 allele of apolipoprotein E (apoE) is a risk factor for Alzheimer's disease (AD), although the mechanism(s) by which it confers this risk is unknown. ApoE may play a direct role in AD neuropathology by modulating neuronal structure. We previously showed that apoE3-containing beta-very low density lipoprotein (beta-VLDL) can stimulate neurite outgrowth to a significantly greater extent than apoE4-enriched beta-VLDL in a central nervous system-derived neuronal cell line and that this effect is mediated by interaction with the low density lipoprotein receptor-related protein (LRP). To determine whether similar differences exist when apoE is associated with other lipoprotein particles, the effects of high density lipoprotein (HDL) derived from plasma and cerebrospinal fluid were defined. ApoE3-enriched HDL significantly enhanced neurite outgrowth as compared with apoE4-enriched HDL, and the majority of this stimulation was blocked in the presence of the receptor-associated protein or a neutralizing antibody to LRP. We also found that cholesterol esterification in the presence of apoE-containing plasma HDL was attenuated in fibroblasts lacking LRP. Therefore, apoE-containing HDL can serve as an LRP ligand, an...Continue Reading

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