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Channel density regulation of firing patterns in a cortical neuron model
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik, Teoretisk biologisk fysik.
2006 (Engelska)Ingår i: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 90, nr 12, s. 4392-4404Artikel i tidskrift (Refereegranskat) 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).

Ort, förlag, år, upplaga, sidor
2006. Vol. 90, nr 12, s. 4392-4404
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
URN: urn:nbn:se:kth:diva-37354DOI: 10.1529/biophysj.105.077032ISI: 000237931500011PubMedID: 16565052Scopus ID: 2-s2.0-33744830019OAI: oai:DiVA.org:kth-37354DiVA, id: diva2:433440
Tillgänglig från: 2011-08-10 Skapad: 2011-08-10 Senast uppdaterad: 2017-12-08Bibliografiskt granskad

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