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Appears in Collections:Computing Science and Mathematics Journal Articles
Peer Review Status: Refereed
Title: Identification and modelling of fast and slow Ih current components in vestibular ganglion neurons
Author(s): Michel, Christophe
Azevedo Coste, Christine
Desmadryl, Gilles
Puel, Jean-Luc
Bourien, Jerome
Graham, Bruce
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Keywords: computational modelling
hyperpolarization-activated cation current
voltage clamp
Issue Date: Nov-2015
Date Deposited: 19-Oct-2015
Citation: Michel C, Azevedo Coste C, Desmadryl G, Puel J, Bourien J & Graham B (2015) Identification and modelling of fast and slow Ih current components in vestibular ganglion neurons. European Journal of Neuroscience, 42 (10), pp. 2867-2877.
Abstract: Previous experimental data indicates the hyperpolarization-activated cation (Ih) current, in the inner ear, consists of two components [different hyperpolarization-activated cyclic nucleotide-gated (HCN) subunits] which are impossible to pharmacologically isolate. To confirm the presence of these two components in vestibular ganglion neurons we have applied a parameter identification algorithm which is able to discriminate the parameters of the two components from experimental data. Using simulated data we have shown that this algorithm is able to identify the parameters of two populations of non-inactivated ionic channels more accurately than a classical method. Moreover, the algorithm was demonstrated to be insensitive to the key parameter variations. We then applied this algorithm to Ih current recordings from mouse vestibular ganglion neurons. The algorithm revealed the presence of a high-voltage-activated slow component and a low-voltage-activated fast component. Finally, the electrophysiological significance of these two Ih components was tested individually in computational vestibular ganglion neuron models (sustained and transient), in the control case and in the presence of cAMP, an intracellular cyclic nucleotide that modulates HCN channel activity. The results suggest that, first, the fast and slow components modulate differently the action potential excitability and the excitatory postsynaptic potentials in both sustained and transient vestibular neurons and, second, the fast and slow components, in the control case, provide different information about characteristics of the stimulation and this information is significantly modified after modulation by cAMP.
DOI Link: 10.1111/ejn.13021
Rights: © 2015 The Authors. European Journal of Neuroscience published by Federation of European Neuroscience Societies and John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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