Reduction of AMPA-selective glutamate receptor subunits in the entorhinal cortex of patients with Alzheimer's disease pathology: a biochemical study.

Abstract:

:Using biochemical techniques we determined concentrations of the AMPA-selective glutamate receptor subunits GluR1 and GluR2/3 in the entorhinal cortex of patients with Alzheimer's disease pathology and age-matched controls. Tangle density was also determined in anatomically matched samples and correlated with GluR1 and GluR2/3 receptor concentration. In Alzheimer's disease brain, Western blot analysis revealed average reductions of 43% and 38% for GluR1 and GluR2/3, respectively. Based on previous immunohistochemical studies, we infer that the majority of protein reduction was due to decreases in GluR1 and GluR2/3 immunolabeled elements in the more superficial layers of the entorhinal cortex (layers II and III). These layers of the entorhinal cortex contained numerous neurofibrillary tangles in Alzheimer's disease, but neither GluR1 nor GluR2/3 protein concentration correlated significantly with tangle density. We hypothesize that the decrease in specific glutamate receptor subunits, particularly GluR2/3, may contribute to the vulnerability of neurons in the entorhinal cortex via mechanisms involving calcium conductance through AMPA-selective channels.

journal_name

Brain Res

journal_title

Brain research

authors

Yasuda RP,Ikonomovic MD,Sheffield R,Rubin RT,Wolfe BB,Armstrong DM

doi

10.1016/0006-8993(95)00178-s

subject

Has Abstract

pub_date

1995-04-24 00:00:00

pages

161-7

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(95)00178-S

journal_volume

678

pub_type

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