NDLI: Roles of axonal sodium channels in precise auditory time coding at nucleus magnocellularis of the chick

Content Provider	PubMed Central
Author	Kuba, Hiroshi Ohmori, Harunori
Copyright Year	2009
Abstract	How the axonal distribution of Na+ channels affects the precision of spike timing is not well understood. We addressed this question in auditory relay neurons of the avian nucleus magnocellularis. These neurons encode and convey information about the fine structure of sounds to which they are tuned by generating precisely timed action potentials in response to synaptic inputs. Patterns of synaptic inputs differ as a function of tuning. A small number of large inputs innervate high- and middle-frequency neurons, while a large number of small inputs innervate low-frequency neurons. We found that the distribution and density of Na+ channels in the axon initial segments varied with the synaptic inputs, and were distinct in the low-frequency neurons. Low-frequency neurons had a higher density of Na+ channels within a longer axonal stretch, and showed a larger spike amplitude and whole-cell Na+ current than high/middle-frequency neurons. Computer simulations revealed that for low-frequency neurons, a large number of Na+ channels were crucial for preserving spike timing because it overcame Na+ current inactivation and K+ current activation during compound EPSPs evoked by converging small inputs. In contrast, fewer channels were sufficient to generate a spike with high precision in response to an EPSP induced by a single massive input in the high/middle-frequency neurons. Thus the axonal Na+ channel distribution is effectively coupled with synaptic inputs, allowing these neurons to convey auditory information in the timing of firing.
Related Links	http://dx.doi.org/10.1113/jphysiol.2008.162651
Ending Page	100
Page Count	14
Starting Page	87
File Format	PDF
ISSN	00223751
e-ISSN	14697793
Journal	The Journal of Physiology
Issue Number	Pt 1
Volume Number	587
Language	English
Publisher	Blackwell Science Inc
Publisher Date	2009-01-01
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Sports Science

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