ERG current in repolarizing plateau potentials in dopamine neurons (Canavier et al 2007)

 Download zip file 
Help downloading and running models
"Blocking the small-conductance (SK) calcium-activated potassium channel promotes burst firing in dopamine neurons both in vivo and in vitro. ... We focus on the underlying plateau potential oscillation generated in the presence of both apamin and TTX, so that action potentials are not considered. We find that although the plateau potentials are mediated by a voltage-gated Ca2+ current, they do not depend on the accumulation of cytosolic Ca2+, then use a computational model to test the hypothesis that the slowly voltage-activated ether-a-go-go–related gene (ERG) potassium current repolarizes the plateaus. The model, which includes a material balance on calcium, is able to reproduce the time course of both membrane potential and somatic calcium concentration, and can also mimic the induction of plateau potentials by the calcium chelator BAPTA." See paper for more.
1 . Canavier CC, Oprisan SA, Callaway JC, Ji H, Shepard PD (2007) Computational Model Predicts a Role for ERG Current in Repolarizing Plateau Potentials in Dopamine Neurons: Implications for Modulation of Neuronal Activity. J Neurophysiol 98:3006-3022 [PubMed]
Model Information (Click on a link to find other models with that property)
Model Type: Neuron or other electrically excitable cell;
Brain Region(s)/Organism:
Cell Type(s): Substantia nigra pars compacta dopaminergic cell;
Channel(s): I L high threshold; I h; I K,Ca; I Calcium; I_HERG;
Gap Junctions:
Simulation Environment: C or C++ program; FORTRAN;
Model Concept(s): Ion Channel Kinetics; Oscillations; Calcium dynamics;
Implementer(s): Canavier, CC;
Search NeuronDB for information about:  Substantia nigra pars compacta dopaminergic cell; I L high threshold; I h; I K,Ca; I Calcium; I_HERG;
Loading data, please wait...