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Lipoproteins in the Central Nervous System

LADU, MARY JO, REARDON, CATHERINE, VAN ELDIK, LINDA, FAGAN, ANNE M., BU, GUOJUN, HOLTZMAN, DAVID, GETZ, GODFREY S.·2000·Annals of the New York Academy of Sciences
DOI 10.1111/j.1749-6632.2000.tb06365.x
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Abstract

A bstract: Although the synthesis and metabolism of plasma lipoproteins are well characterized, little is known about lipid delivery and clearance within the central nervous system (CNS). Our work has focused on characterizing the lipoprotein particles present in the cerebrospinal fluid (CSF) and the nascent particles secreted by astrocytes. In addition to carrying lipids, we have found that β‐amyloid (Ab) associates with lipoproteins, including the discoidal particles secreted by cultured astrocytes and the spherical lipoproteins found in CSF. We believe that association with lipoproteins provides a means of transport and clearance for Aβ. This process may be further influenced by an interaction between Ab and apoprotein E (apoE), the primary protein component of CNS lipoproteins. Specifically, we have investigated the formation and physiologic relevance of a SDS‐stable complex between apoE and Aβ. In biochemical assays, native apoE2 and E3 (associated with lipid particles) form an SDS‐stable complex with Ab that is 20‐fold more abundant than the apoE4:Aβ complex. In cell culture, native apoE3 but not E4 prevents Aβ‐induced neurotoxicity by a mechanism dependent on cell surface apoE receptors. In addition, apoE and the inhibition of apoE receptors prevent Aβ‐induced astrocyte activation. Therefore, we hypothesize that the protection from Aβ‐induced neurotoxicity afforded by apoE3 may result from clearance of the peptide by SDS‐stable apoE3:Aβ complex formation and uptake by apoE receptors.

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Metadata

Authors
LADU, M. J., REARDON, C., VAN ELDIK, L., FAGAN, A. M., BU, G., HOLTZMAN, D., & GETZ, G. S.
Venue
Annals of the New York Academy of Sciences
Publisher
Wiley
Published
2000-04
Volume
903
Issue
1
Pages
167-175
ISSN
  • 0077-8923
  • 1749-6632
DOI
10.1111/j.1749-6632.2000.tb06365.x
Cited by
167
References
14
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 2130 d)

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