Paradoxical effect of ethanol on potassium channel currents and cell survival in cerebellar granule neurons.

Abstract:

:Transient exposure to ethanol (EtOH) results in a massive neurodegeneration in the developing brain leading to behavioral and cognitive deficits observed in fetal alcohol syndrome. There is now compelling evidence that K+ channels play an important role in the control of programmed cell death. The aim of the present work was to investigate the involvement of K+ channels in the EtOH-induced cerebellar granule cell death and/or survival. At low and high concentrations, EtOH evoked membrane depolarization and hyperpolarization, respectively. Bath perfusion of EtOH (10 mM) depressed the I(A) (transient K+ current) potassium current whereas EtOH (400 mM) provoked a marked potentiation of the specific I(K) (delayed rectifier K+ current) current. Pipette dialysis with GTPgammaS or GDPbetaS did not modify the effects of EtOH (400 mM) on both membrane potential and I(K) current. In contrast, the reversible depolarization and slowly recovering inhibition of I(A) induced by EtOH (10 mM) became irreversible in the presence of GTPgammaS. EtOH (400 mM) induced prodeath responses whereas EtOH (10 mM) and K+ channel blockers promoted cell survival. Altogether, these results indicate that in cerebellar granule cells, EtOH mediates a dual effect on K+ currents partly involved in the control of granule cell death.

journal_name

J Neurochem

authors

Lefebvre T,Gonzalez BJ,Vaudry D,Desrues L,Falluel-Morel A,Aubert N,Fournier A,Tonon MC,Vaudry H,Castel H

doi

10.1111/j.1471-4159.2009.06197.x

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

976-89

issue

3

eissn

0022-3042

issn

1471-4159

pii

JNC6197

journal_volume

110

pub_type

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