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Potentiation of voltage-dependent calcium channel currents by NMDA receptor agonists

Neurophysiology, ISSN: 0090-2977, Vol: 29, Issue: 1, Page: 10-15
1997
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The effects of NMDA receptor agonists on voltage-dependent Ca channels were studied in pyramidal neurons freshly dissociated from the CA3 region of the rat hippocampus. In a fraction of investigated cells (18 of 26), application of NMDA receptor agonists resulted in a rapid increase in the amplitude of whole-cell Ca channel currents (CaCC). This effect immediately disappeared on return to the control solution. The current-voltage relationship for the whole-cell Ca channel currents was not shifted under this action of NMDA receptor agonists. It was shown that neither T-, nor L-type CaCC were facilitated by NMDA receptor agonists. The experiments with specific blockers of various types (ω-CgTxGVIA, ω-Aga-IVA, and ω-CgTxMVIIC) showed that N-, P-, and Q-types of Ca channels were not potentiated by NMDA receptor agonists. The involvement of other types of Ca CC (R type, in particular) in the modulatory action of NMDA receptor agonists is considered. © 1997 Plenum Publishing Corporation.

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