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Table of Contents
Vol. 2, No. 5, 2005
Issue release date: February 2006
Section title: Special Topic Section: Immunotherapies and Related Strategies in Alzheimer’s ...
Neurodegenerative Dis 2005;2:261–266
(DOI:10.1159/000090366)

Mechanisms of Aβ Plaque Clearance following Passive Aβ Immunization

Morgan D.
Alzheimer Research Laboratory, Department of Pharmacology, University of South Florida, Tampa, Fla., USA

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Article / Publication Details

First-Page Preview
Abstract of Special Topic Section: Immunotherapies and Related Strategies in Alzheimer’s ...

Published online: February 22, 2006
Issue release date: February 2006

Number of Print Pages: 6
Number of Figures: 3
Number of Tables: 0

ISSN: 1660-2854 (Print)
eISSN: 1660-2862 (Online)

For additional information: http://www.karger.com/NDD

Abstract

Alzheimer’s disease is a major health problem with limited available medical treatment options. Immunotherapy is one approach with the potential to slow or reverse the disease process. In transgenic mouse models of amyloid deposition, anti-Aβ immunotherapy is remarkably effective at diminishing the amyloid burden and reversing the memory deficiency phenotype present in these mice. Three distinct mechanisms of antibody action have been proposed to mediate these benefits of anti-Aβ immunotherapy. The first is a catalytic dissolution of the Aβ fibrils, proposed by Beka Solomon and colleagues. A second mechanism is opsonization of the amyloid by the antibody and subsequent phagocytosis by macrophages proposed by Dale Schenk and the Elan group. A third mechanism proposed by DeMattos, Holtzman and colleagues is the peripheral sink hypothesis, arguing that circulating antibodies sequester Aβ and favor efflux of Aβ from the CNS over influx to the CNS. None of these mechanisms are mutually exclusive. Our research group has evaluated these mechanisms using intracranial injection and systemic administration of anti-Aβ antibodies. We found evidence supporting all three mechanisms, and suggest they may act synergistically to achieve the large effect size of the immunotherapeutic approach. However, in aged amyloid precursor protein transgenic mice administered anti-Aβ antibodies systemically, there is a redistribution of the amyloid from the parenchyma to vascular elements. This increase in congophilic angiopathy is associated with increased risk of microhemorrhage. Thus, although we favor continued testing of the immunotherapy to treat Alzheimer’s disease, we believe caution should be taken to minimize the risk of vascular leakage.

© 2005 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Special Topic Section: Immunotherapies and Related Strategies in Alzheimer’s ...

Published online: February 22, 2006
Issue release date: February 2006

Number of Print Pages: 6
Number of Figures: 3
Number of Tables: 0

ISSN: 1660-2854 (Print)
eISSN: 1660-2862 (Online)

For additional information: http://www.karger.com/NDD


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