Diversity of firing frequency control by A-currents in vertebrate neurons: a modeling study.
Experimental and modeling studies have accumulated strong evidence suggesting that A-currents control firing rates in invertebrate neurons. However, the direct demonstration of a similar role remains to be established in vertebrate neurons. We tested this possibility in a simulated neuron embedded with a generic model of vertebrate A-currents. Under simulated current-clamp protocols, the generic A-current produced a modest frequency reduction (15 Hz) that was constant within all firing frequencies. Modifications in steady-state properties of the A-current model within known physiological ranges annihilated or dramatically increased firing frequency reduction. These results suggest that the influence of A-currents on firing frequency should differ strongly among vertebrate neurons, and that modulations influencing A-currents provide a powerful control over the excitability of vertebrate neurons.
Delord
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INSERM U483, Université Pierre et Marie Curie, Paris, France.
D000818:Animals; D004553:Electric Conductivity; D004594:Electrophysiology; D008959:Models, Neurological; D009474:Neurons / Q000502:physiology*; D015221:Potassium Channels / Q000502:physiology*; D014714:Vertebrates / Q000502:physiology
D015221:Potassium Channels