Linked Life Data

12049183

Source:http://linkedlifedata.com/resource/pubmed/id/12049183

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pubmed-article:12049183pubmed:abstractTextActivated microglia are a prominent component of the senile plaques in end-stage Alzheimer's disease, but whether microglia contribute to the initiation of the lesions remains unknown. In a previous postmortem study of non-demented elderly cases, we found that amyloidogenesis is advanced by at least 10 years in carriers of the apoEepsilon4 allele. To determine whether microglia are involved in the initial stages of beta-amyloid pathogenesis and whether apoE genotype influences microglial activation, we quantified HLA-DR-immunoreactive microglia in the medial temporal lobe of 229 non-demented humans of various APOE genotypes who had died between 50 and 91 years of age. Our results show that the number of HLA-DR-immunoreactive microglia increases with advancing age in both the gray matter and the white matter. In contrast to amyloid plaques and neurofibrillary tangles, there is no significant correlation between apoE genotype and density of microglia, although apoEepsilon4 homozygotes tended to have more microglia than did other apoE groups. In sections double-immunostained for Abeta and activated microglia, activated microglia were associated with dense-cored plaques but not with diffuse plaques, suggesting that microglial activation is a relatively late event in the genesis of beta-amyloid. Activation of microglia thus appears not to be the initial impetus for Abeta-deposition in the elderly.lld:pubmed
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pubmed-article:12049183pubmed:dateRevised2010-11-18lld:pubmed
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pubmed-article:12049183pubmed:articleTitleActivated microglia do not mediate the early deposition of Abeta in carriers of the apolipoprotein Eepsilon4 allele.lld:pubmed
pubmed-article:12049183pubmed:affiliationDepartment of Neuropathology, University of Greifswald, Germany.lld:pubmed
pubmed-article:12049183pubmed:publicationTypeJournal Articlelld:pubmed
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