Ionic mechanisms underlying repetitive high-frequency burst firing in supragranular cortical neurons

Abstract

Neocortical neurons in awake, behaving animals can generate high- frequency (>300 Hz) bursts of action potentials, either in single bursts or in a repetitive manner. Intracellular recordings of layer II/III pyramidal neurons were obtained from adult ferret visual cortical slices maintained in vitro to investigate the ionic mechanisms by which a subgroup of these cells generates repetitive, high-frequency burst discharges, a pattern referred to as 'chattering.' The generation of each but the first action potential in a burst was dependent on the critical interplay between the afterhyperpolarizations (AHPs) and afterdepolarizations (ADPs) that followed each action potential. The spike-afterdepolarization and the generation of action potential bursts were dependent on Na+, but not Ca2+, currents. Neither blocking of the transmembrane flow of Ca2+ nor the intracellular chelation of free Ca2+ with BAPTA inhibited the generation of intrinsic bursts. In contrast, decreasing the extracellular Na+ concentration or pharmacologically blocking Na+ currents with tetrodotoxin, QX-314, or phenytoin inhibited bursting before inhibiting action potential generation. Additionally, a subset of layer II/III pyramidal neurons could be induced to switch from repetitive single spiking to a burst-firing mode by constant depolarizing current injection, by raising extracellular K+ concentrations, or by potentiation of the persistent Na+ current with the Na+ channel toxin ATX II. These results indicate that cortical neurons may dynamically regulate their pattern of action potential generation through control of Na+ and K+ currents. The generation of high-frequency burst discharges may strongly influence the response of postsynaptic neurons and the operation of local cortical networks.