Hyperexcitability from Nav1.2 channel loss in neocortical pyramidal cells (Spratt et al 2021)

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Accession:267067
Based on the Layer 5 thick-tufted pyramidal cell from the Blue Brain Project, we modify the distribution of the sodium channel Nav1.2 to recapitulate an increase in excitability observed in ex vivo slice experiments.
Reference:
1 . Spratt PWE, Alexander RPD, Ben-Shalom R, Sahagun A, Kyoung H, Keeshen CM, Sanders SJ, Bender KJ (2021) Paradoxical hyperexcitability from NaV1.2 sodium channel loss in neocortical pyramidal cells Cell Rep. 36(5):109483 [PubMed]
Citations  Citation Browser
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: Prefrontal cortex (PFC);
Cell Type(s): Neocortex layer 5 pyramidal cell;
Channel(s): I h; I M; I Potassium; I Sodium; I L high threshold; I T low threshold;
Gap Junctions:
Receptor(s):
Gene(s): Nav1.2 SCN2A;
Transmitter(s):
Simulation Environment: NEURON; Python;
Model Concept(s):
Implementer(s): Ben-Shalom, Roy [rbenshalom at ucdavis.edu]; Kyoung, Henry [hkyoung at berkeley.edu];
Search NeuronDB for information about:  I L high threshold; I T low threshold; I M; I h; I Sodium; I Potassium;
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SprattEtAl2021
Ri Increase
mechanisms
branching.mod *
Ca_HVA.mod *
Ca_LVAst.mod *
CaDynamics_E2.mod
Ih.mod *
Im.mod *
K_Pst.mod *
K_Tst.mod *
na12.mod
na12_mut.mod
na1216.mod *
na1216_mut.mod *
na16.mod
na8st.mod *
Nap_Et2.mod *
NaTa_t.mod *
NaTs2_t.mod *
nax8st.mod *
ProbAMPANMDA_EMS.mod *
ProbGABAAB_EMS.mod *
SK_E2.mod *
SKv3_1.mod *
vclmp_pl.mod *
26412.tmp *
                            
:Comment :
:Reference : :		Characterization of a Shaw-related potassium channel family in rat brain, The EMBO Journal, vol.11, no.7,2473-2486 (1992)

NEURON	{
	SUFFIX SKv3_1
	USEION k READ ek WRITE ik
	RANGE gSKv3_1bar, gSKv3_1, ik 
}

UNITS	{
	(S) = (siemens)
	(mV) = (millivolt)
	(mA) = (milliamp)
}

PARAMETER	{
	gSKv3_1bar = 0.00001 (S/cm2) 
}

ASSIGNED	{
	v	(mV)
	ek	(mV)
	ik	(mA/cm2)
	gSKv3_1	(S/cm2)
	mInf
	mTau
}

STATE	{ 
	m
}

BREAKPOINT	{
	SOLVE states METHOD cnexp
	gSKv3_1 = gSKv3_1bar*m
	ik = gSKv3_1*(v-ek)
}

DERIVATIVE states	{
	rates()
	m' = (mInf-m)/mTau
}

INITIAL{
	rates()
	m = mInf
}

PROCEDURE rates(){
	UNITSOFF
		mInf =  1/(1+exp(((v -(18.700))/(-9.700))))
		mTau =  0.2*20.000/(1+exp(((v -(-46.560))/(-44.140))))
	UNITSON
}