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This Article Full Text Full Text (PDF) All Versions of this Article: 98/5/2878    most recent 00362.2007v2 00362.2007v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by de Rivero Vaccari, J. C. Articles by Belousov, A. B. Search for Related Content PubMed PubMed Citation Articles by de Rivero Vaccari, J. C. Articles by Belousov, A. B.

Gap Junctions Are Required for NMDA Receptor–Dependent Cell Death in Developing Neurons

¹Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center; ²Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana; ³Coriell Institute for Medical Research, Camden, New Jersey; and ⁴Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas

Submitted 30 March 2007; accepted in final form 11 September 2007

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.