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 Communjournal_title
Nature communicationsauthors
Scott RS,Henneberger C,Padmashri R,Anders S,Jensen TP,Rusakov DAdoi
10.1038/ncomms4817subject
Has Abstractpub_date
2014-05-23 00:00:00pages
3817issn
2041-1723pii
ncomms4817journal_volume
5pub_type
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