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* Cellular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037; and Glutathione depletion occurs in several
forms of apoptosis and is associated with Parkinson's
disease and HIV toxicity. The neurotransmitter
glutamate kills immature cortical neurons and a hippocampal nerve cell line via an oxidative pathway associated with glutathione depletion. It is shown here that
soluble guanylyl cyclase (sGC) activity is required for
nerve cell death caused by glutathione depletion. Inhibitors of sGC block glutamate toxicity and a cGMP analogue potentiates cell death. Glutamate also induces an
elevation of cGMP that occurs late in the cell death
pathway. The resultant cGMP modulates the increase
in intracellular calcium that precedes cell death because
sGC inhibitors prevent calcium elevation and the
cGMP analogue potentiates the increase in intracellular calcium. These results suggest that the final pathway
of glutamate induced nerve cell death is through a
cGMP-modulated calcium channel.
Department of
Cell Biology, The Scripps Research Institute, La Jolla, California 92037
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