Resurgent sodium current promotes action potential firing in the avian auditory brainstem.

Auditory brainstem neurons are functionally primed to fire action potentials (APs) at markedly high rates in order to rapidly encode the acoustic information of sound. This specialization is critical for survival and the comprehension of behaviourally relevant communication functions, including sound localization and distinguishing speech from noise. Here, we investigated underlying ion channel mechanisms essential for high-rate AP firing in neurons of the chicken nucleus magnocellularis (NM) - the avian analogue of bushy cells of the mammalian anteroventral cochlear nucleus. In addition to the established function of high voltage-activated potassium channels, we found that resurgent sodium current (INaR ) plays a role in regulating rapid firing activity of late-developing (embryonic (E) days 19-21) NM neurons. INaR of late-developing NM neurons showed similar properties to mammalian neurons in that its unique mechanism of an 'open channel block state' facilitated the recovery and increased the availability of sodium (NaV ) channels after depolarization. Using a computational model of NM neurons, we demonstrated that removal of INaR reduced high-rate AP firing. We found weak INaR during a prehearing period (E11-12), which transformed to resemble late-developing INaR properties around hearing onset (E14-16). Anatomically, we detected strong NaV 1.6 expression near maturation, which became increasingly less distinct at hearing onset and prehearing periods, suggesting that multiple NaV channel subtypes may contribute to INaR during development. We conclude that INaR plays an important role in regulating rapid AP firing for NM neurons, a property that may be evolutionarily conserved for functions related to similar avian and mammalian hearing.