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Effect of oleate on neurotransmitter transport and other plasma membrane functions in rat brain synaptosomes.

Abstract：

:The effects of fatty acids, oleate and palmitate, on gamma-aminobutyric acid (GABA), aspartate, and 3,4- dihydroxyphenylethylamine (dopamine) transport and a variety of other membrane functions were studied in rat brain synaptosomes at a constant lipid-to-protein ratio. Under the conditions utilized oleate, but not palmitate, caused statistically significant changes in synaptosomal functions. Oleic acid inhibited the uptake of the amino acid neurotransmitters and dopamine in a tetrodotoxin-insensitive manner; it also induced the release of neurotransmitters from synaptosomes. The synaptosomal membrane potential decreased and the maximum GABA accumulation ratio [( GABA]i/[GABA]o) declined in parallel. The same depolarizing effect was seen in the presence of 50 microM verapamil or when chloride was replaced by propionate. The rate of respiration was stimulated by the unsaturated fatty acid; neither verapamil (50 microM) nor ouabain (100 microM) was effective in preventing the increase in oxygen consumption. By contrast, ruthenium red substantially decreased the stimulatory effect of oleate. The intrasynaptosomal [Ca2+] was increased by 40%, whereas [Na+]i remained unaltered. It is postulated that under the conditions used the inhibition of neurotransmitter uptake and the decrease in their accumulation caused by oleate result from the depolarization of synaptosomes that arises, at least in part, from increased permeability of the plasma membrane to calcium ions.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Troeger MB,Rafalowska U,Erecińska M

doi

10.1111/j.1471-4159.1984.tb12765.x

subject

Has Abstract

pub_date

1984-06-01 00:00:00

pages

1735-42

issue

6

eissn

0022-3042

issn

1471-4159

journal_volume

42

pub_type

杂志文章

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