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Channel density regulation of firing patterns in a cortical neuron model
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Biological Physics.
2006 (English)In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 90, no 12, 4392-4404 p.Article in journal (Refereed) Published
Abstract [en]

Modifying the density and distribution of ion channels in a neuron (by natural up- and downregulation or by pharmacological intervention or by spontaneous mutations) changes its activity pattern. In this investigation we analyzed how the impulse patterns are regulated by the density of voltage-gated channels in a neuron model based on voltage-clamp measurements of hippocampal interneurons. At least three distinct oscillatory patterns, associated with three distinct regions in the Na-K channel density plane, were found. A stability analysis showed that the different regions are characterized by saddle-node, double-orbit, and Hopf-bifurcation threshold dynamics, respectively. Single, strongly graded action potentials occur in an area outside the oscillatory regions, but less graded action potentials occur together with repetitive. ring over a considerable range of channel densities. The relationship found here between channel densities and oscillatory behavior may partly explain the difference between the principal spiking patterns previously described for crab axons (class 1 and 2) and cortical neurons ( regular. ring and fast spiking).

Place, publisher, year, edition, pages
2006. Vol. 90, no 12, 4392-4404 p.
National Category
Biological Sciences
URN: urn:nbn:se:kth:diva-37354DOI: 10.1529/biophysj.105.077032ISI: 000237931500011PubMedID: 16565052ScopusID: 2-s2.0-33744830019OAI: diva2:433440
Available from: 2011-08-10 Created: 2011-08-10 Last updated: 2011-08-10Bibliographically approved

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