Neuronal adaptation involves rapid expansion of the action potential initiation site.

Abstract:

:Action potential (AP) generation is the key to information-processing in the brain. Although APs are normally initiated in the axonal initial segment, developmental adaptation or prolonged network activity may alter the initiation site geometry thus affecting cell excitability. Here we find that hippocampal dentate granule cells adapt their spiking threshold to the kinetics of the ongoing dendrosomatic excitatory input by expanding the AP-initiation area away from the soma while also decelerating local axonal spikes. Dual-patch soma-axon recordings combined with axonal Na(+) and Ca(2+) imaging and biophysical modelling show that the underlying mechanism involves distance-dependent inactivation of axonal Na(+) channels due to somatic depolarization propagating into the axon. Thus, the ensuing changes in the AP-initiation zone and local AP propagation could provide activity-dependent control of cell excitability and spiking on a relatively rapid timescale.

journal_name

Nat Commun

journal_title

Nature communications

authors

Scott RS,Henneberger C,Padmashri R,Anders S,Jensen TP,Rusakov DA

doi

10.1038/ncomms4817

subject

Has Abstract

pub_date

2014-05-23 00:00:00

pages

3817

issn

2041-1723

pii

ncomms4817

journal_volume

5

pub_type

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