Multi-comp. CA1 O-LM interneuron model with varying dendritic Ih distributions (Sekulic et al 2015)

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Accession:182797
The model presented here was used to investigate possible dendritic distributions of the HCN channel-mediated current (Ih) in models of oriens-lacunosum/moleculare (O-LM) CA1 hippocampal interneurons. Physiological effects of varying the dendritic distributions consisted of examining back-propagating action potential speeds.
Reference:
1 . Sekulic V, Chen TC, Lawrence JJ, Skinner FK (2015) Dendritic distributions of I h channels in experimentally-derived multi-compartment models of oriens-lacunosum/moleculare (O-LM) hippocampal interneurons. Front Synaptic Neurosci 7:2 [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): Hippocampus CA1 stratum oriens lacunosum-moleculare interneuron ;
Channel(s): I Na,t; I A; I K; I K,leak; I M; I h; I K,Ca; I Calcium; I_AHP;
Gap Junctions:
Receptor(s):
Gene(s):
Transmitter(s):
Simulation Environment: NEURON;
Model Concept(s): Dendritic Action Potentials; Active Dendrites; Detailed Neuronal Models; Conductance distributions;
Implementer(s):
Search NeuronDB for information about:  I Na,t; I A; I K; I K,leak; I M; I h; I K,Ca; I Calcium; I_AHP;
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SekulicEtAl2015
04525047--90nA
04610022--90nA
README.html
cad.mod *
ICaL.mod *
ICaT.mod *
Ih.mod
IKa.mod *
IKCa.mod *
Ikdrf.mod *
Ikdrfaxon.mod *
Ikdrs.mod *
Ikdrsaxon.mod *
Ikleakaxon.mod *
Ikleaksd.mod *
IMminret.mod *
IMmintau.mod *
Ipassaxon.mod *
Ipasssd.mod *
Naaxon.mod *
Nadend.mod *
Nasoma.mod *
.initactivesdRichy.hoc.swp
.ipsc-cihr.hoc.swp
active_mods.hoc
celltestt.dat
dendIh_funcs.hoc
frontiers_Fig10.hoc
ihold_funcs.hoc
init_d_lambda_Richy_trunc.hoc
init_d_lambda_Starfish_full.hoc
init_exp.hoc
init_Richy_RN.hoc
initactivesdRichy.hoc
initactivesdStarfish.hoc
initactivesdStarfishfull.hoc
iprotocol.hoc
ipsc.hoc
ipsc-cihr.hoc
mosinit.hoc
nsegfuncs.hoc
param_active_cond.hoc
params.hoc
Richytrunctest2.hoc
rn.hoc
screen.png
screen1.png
Starfishfull.hoc
Starfishtrunc.hoc
startup_R3.sh
startup_R4.sh
startup_S3.sh
startup_S4.sh
                            
TITLE CaGk
: Calcium activated K channel.
: Modified from Moczydlowski and Latorre (1983) J. Gen. Physiol. 82

UNITS {
	(molar) = (1/liter)
}

UNITS {
	(mV) =	(millivolt)
	(mA) =	(milliamp)
	(mM) =	(millimolar)
}


NEURON {
	SUFFIX kca
	USEION ca READ cai
	USEION k READ ek WRITE ik
	RANGE gkbar,gkca, ik
	GLOBAL oinf, tau
}

UNITS {
	FARADAY = (faraday)  (kilocoulombs)
	R = 8.313424 (joule/degC)
}

PARAMETER {
	celsius		(degC)
	v		(mV)
	gkbar=.01	(mho/cm2)	: Maximum Permeability
	cai = 5.e-5	(mM)
	ek		(mV)

	d1 = .84
	d2 = 1.
	k1 = .48e-3	(mM)
	k2 = .13e-6	(mM)
	abar = .28	(/ms)
	bbar = .48	(/ms)
        st=1            (1)
}

ASSIGNED {
	ik		(mA/cm2)
	oinf
	tau		(ms)
        gkca          (mho/cm2)
}

INITIAL {
        rate(v,cai)
        o=oinf
}

STATE {	o }		: fraction of open channels

BREAKPOINT {
	SOLVE state METHOD cnexp
	gkca = gkbar*o^st
	ik = gkca*(v - ek)
}

DERIVATIVE state {	: exact when v held constant; integrates over dt step
	rate(v, cai)
	o' = (oinf - o)/tau
}

FUNCTION alp(v (mV), c (mM)) (1/ms) { :callable from hoc
	alp = c*abar/(c + exp1(k1,d1,v))
}

FUNCTION bet(v (mV), c (mM)) (1/ms) { :callable from hoc
	bet = bbar/(1 + c/exp1(k2,d2,v))
}

FUNCTION exp1(k (mM), d, v (mV)) (mM) { :callable from hoc
	exp1 = k*exp(-2*d*FARADAY*v/R/(273.15 + celsius))
}

PROCEDURE rate(v (mV), c (mM)) { :callable from hoc
	LOCAL a
	a = alp(v,c)
	tau = 1/(a + bet(v, c))
	oinf = a*tau
}



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