A deficit in astroglial organization causes the impaired reactive sprouting in human apolipoprotein E4 targeted replacement mice.

Published

Journal Article

The epsilon4 allele of apolipoprotein (apo)E associates with an increased risk of developing Alzheimer's disease (AD) as well as an earlier age of onset. However, the exact mechanisms by which apoE4 confers such susceptibility is currently unknown. We used a human apoE targeted replacement (hE-TR) mouse model to investigate the allele-specific response to entorhinal cortex lesion (ECL). We observed a marked impairment in reactive sprouting in hE4 mice compared to hE3 mice. ApoE expression was similar between genotypes at days post-lesion (DPL) 2 and 14. Thirty days post-lesion, hE4 mice had more reactive astrocytes as well as a defective outward migration pattern of the astrocytes in the dentate gyrus. The expression of the anti-inflammatory cytokine IL-1ra was delayed in hE4 mice compared to hE3 mice. ApoE and beta-amyloid (Abeta) 1-40 accumulated at 30 DPL in hE4 mice. These results suggest that the presence of apoE4 delays the astroglial repair process and indirectly compromises synaptic remodeling.

Full Text

Duke Authors

Cited Authors

  • Blain, J-F; Sullivan, PM; Poirier, J

Published Date

  • March 2006

Published In

Volume / Issue

  • 21 / 3

Start / End Page

  • 505 - 514

PubMed ID

  • 16171999

Pubmed Central ID

  • 16171999

International Standard Serial Number (ISSN)

  • 0969-9961

Digital Object Identifier (DOI)

  • 10.1016/j.nbd.2005.08.010

Language

  • eng

Conference Location

  • United States