Abstract
Invoking the modulation of parallel cellular pathways, the G-protein metabotropic glutamate receptors (mGluRs) and nitric oxide (NO) have been shown to require a host of signal transduction pathways to modulate neuronal programmed cell death (PCD). Since the cysteine protease caspase-3 (CPP32) is one of the principal mediators of PCD in several non-neuronal cell systems, we investigated whether CPP32 activity was linked to both NO induced PCD and mGluR neuroprotection. We demonstrate that NO directly increases the activity of CPP32 by approximately 400% over a 6 h period that is necessary, at least in part, for the generation of neuronal PCD. Activation of only Group I mGluRs completely ameliorates the induction of CPP32 activity by NO and prevents the induction of PCD.
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