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J Neurophysiol 97: 2696-2711, 2007. First published February 7, 2007; doi:10.1152/jn.00528.2006 Free Article
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Roles of Ionic Currents in Lamprey CPG Neurons: A Modeling Study

Mikael Huss1,2, Anders Lansner1, Peter Wallén2, Abdeljabbar El Manira2, Sten Grillner2 and Jeanette H. Kotaleski1,2

1School of Computer Science and Communication, Royal Institute of Technology, Stockholm, Sweden; and 2Department of Neuroscience, Nobel Institute for Neurophysiology, Karolinska Institutet, Stockholm, Sweden

Submitted 17 May 2006; accepted in final form 2 February 2007

The spinal network underlying locomotion in the lamprey consists of a core network of glutamatergic and glycinergic interneurons, previously studied experimentally and through mathematical modeling. We present a new and more detailed computational model of lamprey locomotor network neurons, based primarily on detailed electrophysiological measurements and incorporating new experimental findings. The model uses a Hodgkin–Huxley-like formalism and consists of 86 membrane compartments containing 12 types of ion currents. One of the goals was to introduce a fast, transient potassium current (Kt) and two sodium-dependent potassium currents, one faster (KNaF) and one slower (KNaS), in the model. Not only has the model lent support to the interpretation of experimental results but it has also provided predictions for further experimental analysis of single-network neurons. For example, Kt was shown to be one critical factor for controlling action potential duration. In addition, the model has proved helpful in investigating the possible influence of the slow afterhyperpolarization on repetitive firing during ongoing activation. In particular, the balance between the simulated slow sodium-dependent and calcium-dependent potassium currents has been explored, as well as the possible involvement of dendritic conductances.

Address for reprint requests and other correspondence: J. Hellgren Kotaleski, Nobel Institute for Neurophysiology, Department of Neuroscience, Karolinska Institutet, SE 17177, Stockholm, Sweden (E-mail: jeanette.hellgren{at}ki.se)






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