Ethanol alters glutamate but not adenosine uptake in rat astrocytes: evidence for protein kinase C involvement.

Abstract:

:Glutamate is the primary excitatory neurotransmitter in brain. By stimulating neuronal activity, glutamate increases cellular energy utilization, enhances ATP hydrolysis and promotes the formation of adenosine. Adenosine has receptor-mediated effects that reduce or oppose the excitatory effects of glutamate. As a possible mechanism for ethanol's ability to inhibit excitatory effects of glutamate and enhance inhibitory effects of adenosine, we tested the hypothesis that ethanol promotes [3H]glutamate uptake and inhibits [3H]adenosine uptake. Using primary cultures of rat astrocytes, we found that acute treatment with ethanol (50 mM, 30 min) inhibited [3H]glutamate uptake and reduced protein kinase C (PKC)-induced stimulation of [3H]glutamate uptake. Prolonged treatment (50 mM, 3 day) with ethanol, however, increased both [3H]glutamate uptake and PKC activity. Contrary to other cell types, neither acute or chronic ethanol exposure affected [3H]adenosine uptake in astrocytes. These data indicate that in rat cortical astrocytes ethanol affects [3H]glutamate uptake but not [3H]adenosine uptake by affecting PKC modulation of transporter activity.

journal_name

Neurochem Res

journal_title

Neurochemical research

authors

Othman T,Sinclair CJ,Haughey N,Geiger JD,Parkinson FE

doi

10.1023/a:1014955111742

keywords:

subject

Has Abstract

pub_date

2002-04-01 00:00:00

pages

289-96

issue

4

eissn

0364-3190

issn

1573-6903

journal_volume

27

pub_type

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