Phase response curve of a globus pallidal neuron (Fujita et al. 2011)

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Accession:143100
We investigated how changes in ionic conductances alter the phase response curve (PRC) of a globus pallidal (GP) neuron and stability of a synchronous activity of a GP network, using a single-compartmental conductance-based neuron model. The results showed the PRC and the stability were influenced by changes in the persistent sodium current, the Kv3 potassium, the M-type potassium and the calcium-dependent potassium current.
Reference:
1 . Fujita T, Fukai T, Kitano K (2012) Influences of membrane properties on phase response curve and synchronization stability in a model globus pallidus neuron. J Comput Neurosci 32:539-53 [PubMed]
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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: Basal ganglia;
Cell Type(s): Globus pallidus neuron;
Channel(s): I Na,p; I Na,t; I A; I M; I h; I K,Ca; I Calcium; I A, slow; KCNQ1;
Gap Junctions:
Receptor(s):
Gene(s):
Transmitter(s): Ions;
Simulation Environment: NEURON;
Model Concept(s): Synchronization; Parkinson's; Phase Response Curves;
Implementer(s): Kitano, Katsunori [kitano at ci.ritsumei.ac.jp];
Search NeuronDB for information about:  I Na,p; I Na,t; I A; I M; I h; I K,Ca; I Calcium; I A, slow; KCNQ1; Ions;
TITLE high-voltage-activated calcium channel for GPe neuron

COMMENT
 modeled by Gunay et al., 2008
 implemented in NEURON by Kitano, 2011
ENDCOMMENT

UNITS {
 (mV) = (millivolt)
 (mA) = (milliamp)
 (mM) = (milli/liter)
}

NEURON {
 SUFFIX CaH
 USEION ca READ cai,cao WRITE ica
 RANGE gmax, iCaH
}

PARAMETER {
 v (mV)
 dt (ms)
 cai (mM)
 cao (mM)
 gmax  = 0.001 (mho/cm2)
 iCaH  = 0.0 (mA/cm2)
 e = 130 (mV)

 theta_m = -20.0 (mV)
 k_m = 7.0 (mV)
 taum = 0.2 (ms)
}

STATE {
 m
}

ASSIGNED { 
 ica (mA/cm2)
 minf
}

BREAKPOINT {
 SOLVE states METHOD cnexp
 ica  = gmax*m*(v-e)
 iCaH = ica
}

UNITSOFF

INITIAL {
 settables(v)
 m = minf
}

DERIVATIVE states {  
 settables(v)
 m' = (minf - m)/taum
}

PROCEDURE settables(v) {
        TABLE minf FROM -100 TO 100 WITH 400

	minf = 1.0 / (1.0 + exp((theta_m - v)/k_m))
}

UNITSON