Different Membrane Pathways Mediate Ca²⁺ Influx in Adrenal Chromaffin Cells Exposed to 150-400 ns Electric Pulses.

The selective P/Q-type channel antagonist ω -agatoxin IVA (100 nM) reduced the magnitude of the Ca 2+ response by 24% ( p < 0.05), whereas the selective N-type channel antagonist ω -conotoxin GIVA (20 nM) reduced the magnitude of the rise in [Ca 2+ ] i by 9%, although the effect did not reach statistical significance.

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