TTX-R Na+ current effect on cell response (Herzog et al 2001) (MATLAB)

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Accession:120117
"Small dorsal root ganglion (DRG) neurons, which include nociceptors, express multiple voltage-gated sodium currents. In addition to a classical fast inactivating tetrodotoxin-sensitive (TTX-S) sodium current, many of these cells express a TTX-resistant (TTX-R) sodium current that activates near -70 mV and is persistent at negative potentials. To investigate the possible contributions of this TTX-R persistent (TTX-RP) current to neuronal excitability, we carried out computer simulations using the Neuron program with TTX-S and -RP currents, fit by the Hodgkin-Huxley model, that closely matched the currents recorded from small DRG neurons. ..." See paper for more and details.
Reference:
1 . Herzog RI, Cummins TR, Waxman SG (2001) Persistent TTX-resistant Na+ current affects resting potential and response to depolarization in simulated spinal sensory neurons. J Neurophysiol 86:1351-64 [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):
Channel(s): I Na,p; I Na,t; I K;
Gap Junctions:
Receptor(s):
Gene(s):
Transmitter(s):
Simulation Environment: MATLAB;
Model Concept(s): Ion Channel Kinetics; Nociception;
Implementer(s): Andersson, Thomas [toma at math.su.se];
Search NeuronDB for information about:  I Na,p; I Na,t; I K;
% FUNCTION "NATS" - CALCULATION OF STATIONARY DISTRIBUTION
% AND TIME CONSTANT FOR Na TTX-S

function [tmNats,pmNats,thNats,phNats]=Nats(V);
am=11.49/(1+exp((V+8.58)/-8.47));
bm=11.49/(1+exp((V+67.2)/27.8));
ah=0.0658*exp(-(V+120)/20.33);
bh=3/(1+exp((V-6.8)/-12.998));
tmNats=1/(am+bm);
pmNats=am/(am+bm);
thNats=1/(ah+bh);
phNats=ah/(ah+bh);
return

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