Ionotropic glutamate receptor subtypes activate c-fos transcription by distinct calcium-requiring intracellular signaling pathways - PubMed (original) (raw)
Ionotropic glutamate receptor subtypes activate c-fos transcription by distinct calcium-requiring intracellular signaling pathways
L S Lerea et al. Neuron. 1993 Jan.
Abstract
N-Methyl-D-aspartate (NMDA) or non-NMDA receptor activation is sufficient to induce transcription of the immediate early gene c-fos in a calcium-requiring manner. We sought to determine whether the calcium-dependent mechanisms inducing c-fos transcription are identical following activation of these two receptor subtypes. We used in situ hybridization and fura-2 imaging to detect c-fos mRNA and intracellular calcium in individual dentate gyrus neurons maintained in vitro. Structurally distinct inhibitors of phospholipase A2 and cyclooxygenase abolished NMDA--but not kainic acid-induced increases of c-fos mRNA. Conversely, the calmodulin antagonist calmidazolium markedly inhibited kainic acid--but not NMDA-mediated increases of c-fos mRNA. We propose that the dissociation in the mechanisms transducing the calcium influx signals to the nucleus following NMDA and non-NMDA receptor activation is due to spatially distinct sites of calcium entry, resulting in activation of different enzymes located at distinct sites in the cell.
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