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Inhibition of synaptosomal [3H]glutamate uptake and [3H]glutamate binding to plasma membranes from brain of young rats by glutaric acid in vitro.

Abstract：

:Synaptosomes and plasma membrane preparations from brain of 30-day-old rats were incubated with glutaric acid at final concentrations ranging from 10 nM to 1 mM for the determination of glutamate uptake and binding, respectively. [3H]Glutamate uptake into synaptosomes was inhibited by approximately 50% by 1 mM glutaric acid, corresponding to the concentration found in brain of glutaric acidemic children. In addition, in the presence of extracellular Na+ concentrations, the same dose of glutaric acid decreased by about 30% [3H]glutamate binding to brain plasma membranes. The results indicate that the inhibition of both glutamate uptake into synaptosomes and glutamate binding to plasma synaptic membranes by the metabolite could result in elevated concentrations of the excitatory neurotransmitter in the synaptic cleft, potentially causing excitotoxicity to neural cells, a fact that may be related to the brain damage characteristic of glutaric acidemia type I.

journal_name

J Neurol Sci

journal_title

Journal of the neurological sciences

authors

Porciúncula LO,Dal-Pizzol A Jr,Coitinho AS,Emanuelli T,Souza DO,Wajner M

doi

10.1016/s0022-510x(99)00307-x

subject

Has Abstract

pub_date

2000-02-15 00:00:00

pages

93-6

issue

2

eissn

0022-510X

issn

1878-5883

pii

S0022-510X(99)00307-X

journal_volume

173

pub_type

杂志文章

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