Molecular regulation of acute ethanol-induced neuron apoptosis.

Abstract:

:Ethanol is a potent neurotoxin particularly for the developing nervous system. Intrauterine exposure to ethanol during the last trimester of human gestation can produce a broad spectrum of neuropathologic consequences. This period of human brain development is roughly equivalent to the first week of rodent postnatal life and acute exposure of neonatal mice to ethanol produces massive neuronal apoptosis throughout the brain. We have previously demonstrated that ethanol-induced neuron apoptosis is critically dependent on expression of Bax, a proapoptotic member of the Bcl-2 family. To further define the molecular pathway regulating ethanol-induced neuron apoptosis, we analyzed the effects of acute ethanol exposure on cerebellar internal granule cell neurons both in vivo and in vitro. Ethanol produced extensive Bax-dependent caspase-3 activation and neuron apoptosis in the cerebellar internal granule cell layer, which was maximal at approximately 6 hours postadministration. This effect was recapitulated in vitro and required new gene transcription, protein translation, Bax expression, and caspase activation. Ethanol-induced neuron death was independent of p53 expression and was unaffected by deficiency in the proapoptotic Bcl-2 family members Bid or Bad. These studies indicate that ethanol activates an intrinsic apoptotic death program in neurons that is likely to contribute to the neuropathologic effects of human fetal alcohol exposure.

authors

Nowoslawski L,Klocke BJ,Roth KA

doi

10.1093/jnen/64.6.490

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

490-7

issue

6

eissn

0022-3069

issn

1554-6578

journal_volume

64

pub_type

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