Gap junctions are required for NMDA receptor dependent cell death in developing neurons.

Abstract:

:A number of studies have indicated an important role for N-methyl-D-aspartate (NMDA) receptors in cell survival versus cell death decisions during neuronal development, trauma, and ischemia. Coupling of neurons by electrical synapses (gap junctions) is high or increases in neuronal networks during all three of these conditions. However, whether neuronal gap junctions contribute to NMDA receptor-regulated cell death is not known. Here we address the role of neuronal gap junction coupling in NMDA receptor-regulated cell death in developing neurons. We report that inactivation or hyperactivation of NMDA receptors induces neuronal cell death in primary hypothalamic cultures, specifically during the peak of developmental gap junction coupling. In contrast, increasing or decreasing NMDA receptor function when gap junction coupling is low has no or greatly reduced impact on cell survival. Pharmacological inactivation of gap junctions or knockout of neuronal connexin 36 prevents the cell death caused by NMDA receptor hypofunction or hyperfunction. The results indicate the critical role of neuronal gap junctions in cell death caused by increased or decreased NMDA receptor function in developing neurons. Based on these data, we propose the novel hypothesis that NMDA receptors and gap junctions work in concert to regulate neuronal survival.

journal_name

J Neurophysiol

authors

de Rivero Vaccari JC,Corriveau RA,Belousov AB

doi

10.1152/jn.00362.2007

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

2878-86

issue

5

eissn

0022-3077

issn

1522-1598

pii

00362.2007

journal_volume

98

pub_type

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