begintemplate Mousa2020
//"This is a simplified 6 compartment cell template for Mousa, 2020 Model"
//Mousa, M. H., & Elbasiouny, S. M. (2020). Dendritic distributions of L-type Ca2+ and SKL channels in spinal motoneurons:
//a simulation study. Journal of Neurophysiology, 124(4), 1285-1307.
// Auto start
// ********************************************************** ##
// Author: Mohammed Mousa
// Email: Mohamed.Mousa@wright.edu
// Affiliation: Wright State University
// ********************************************************** ##
public soma, iseg, dend1, dend2, dend3,dend0
public all, somatic, basal, AHIS
// load_file("nrngui.hoc") // Load Neuron
proc init() {
topol()
createCell()
subsets()
parameters()
segments_numbers() //enabling this, would increase the nseg
}
// soma
//------
create soma, iseg, dend1, dend2, dend3, dend0
proc topol(){
connect iseg(1), soma(0)
connect dend0(0), soma(0.5)
connect dend1(0), dend0(1)
connect dend2(0), dend1(1)
connect dend3(0), dend2(1)
}
proc createCell(){
v_init = -70
soma {
nseg = 1
L = 48.8
diam = 48.8
insert pas
g_pas= 1/225
e_pas= v_init
Ra = 70
cm = 1
insert NafSmb1
gnabar_NafSmb1 = 0.06
th_NafSmb1 = 40
insert KdrSmb1
gkdrbar_KdrSmb1 = 0.80048
insert CaSmb1
gkcabar_CaSmb1 = 0.0221 // instead of 0.02
gcanbar_CaSmb1= 0.01
gcalbar_CaSmb1 = 0
amA_NafSmb1 = 22
bmA_NafSmb1 = 46
theta_h_NafSmb1 = 47
theta_n_KdrSmb1 = 20
thetamn_CaSmb1 = 14
thetahn_CaSmb1 = 32
f_CaSmb1 = 0.01
alpha_CaSmb1 = 1
kca_CaSmb1 = 8
kd_CaSmb1 = 0.0005
nexp_CaSmb1 = 1
}
// axon hillock
//--------------
iseg {
nseg = 1
L = 20
diam = 12.94999838
insert pas
g_pas= 1/225
e_pas= v_init
Ra = 70
cm = 1
// insert hb1
// ghbar_hb1 = 0.001/7
insert NafIsb1
gnabar_NafIsb1 = 1.3392
th_NafIsb1 = 40
insert NapIsb1
gnapbar_NapIsb1 = 3.2971e-5
insert KdrIsb1
gkbar_KdrIsb1 = 0.16552
amA_NafIsb1 = 18
bmA_NafIsb1 = 38
theta_h_NafIsb1 = 47
theta_n_KdrIsb1 = 20
ampB_NapIsb1 = 30.4
bmpB_NapIsb1 = 34.7
}
CaDen_Max = 0.000168 // for a peak of 12.29
// Dendrites
//-----------
dend0 {
insert info
nseg = 1
// L = 1625.55
L = 1450.97
diam = 42.2188 // Area 64%
// diam(0:1) = 41.436:42.492
insert pas
g_pas= 1/11000
e_pas= v_init
Ra = 70
cm = 1
// insert hb1
// ghbar_hb1 = 0.002/7
}
dend1 {
insert info
nseg = 1
// L = 1625.55
L = 1450.97
diam = 42.2188 // Area 64%
// diam(0:1) = 41.436:42.492
insert pas
g_pas= 1/11000
e_pas= v_init
Ra = 70
cm = 1
// insert hb1
// ghbar_hb1 = 0.002/7
}
dend2 {
insert info
// L = 1581.58
// diam(0:1) = 42.492:34.303
L = 754.842 * 1.81
diam = 36.4297 //Area 26%
nseg = 1
insert pas
g_pas= 1/11000
e_pas= v_init
Ra = 70
cm = 1
insert CaDen
theta_m_CaDen = -43 // was 43 originally
O_tau_CaDen = 10 // Activation time constant
O_tau2_CaDen = 50 // deactivation time constant (50+10=60)
W_tau_d_CaDen = 1200 // warm-up tail current time constant
tailon_CaDen = 1 // 1 for on, 0 for off
AmpRandG_CaDen = 0.5 // compensation for turning the RNG off
gcabar_CaDen = CaDen_Max
gkcabar_CaDen = CaDen_Max * 0.41 // SK channel conductance
Warm_Gear_CaDen = 1 // 1 is the default, increasing it, ramp-up the warm-up kinetics
Warm_thresh_CaDen= 0.27
}
dend3 {
// L = 3587.98
// diam(0:1) = 34.303:0.53
L = 1037.91 * 1.81
diam = 10.1901 // area 10%
nseg = 1
insert info
insert pas
g_pas= 1/11000
e_pas= v_init
Ra = 70
cm = 1
// insert hb1
// ghbar_hb1 = 0.002/7
insert CaDen
theta_m_CaDen = -43 // was 43 originally
O_tau_CaDen = 10 // Activation time constant
O_tau2_CaDen = 50 // deactivation time constant (50+10=60)
W_tau_d_CaDen = 1200 // warm-up tail current time constant
tailon_CaDen = 1 // 1 for on, 0 for off
AmpRandG_CaDen = 0.5 // compensation for turning the RNG off
gcabar_CaDen = CaDen_Max * 0.25
gkcabar_CaDen = CaDen_Max * 0.41 * 0.25
Warm_Gear_CaDen = 1 // 1 is the default, increasing it, ramp-up the warm-up kinetics
Warm_thresh_CaDen= 0.27
}
print "6 compartment cell created"
}
objref all, somatic, basal , AHIS
proc subsets() {
objref all, somatic, basal , AHIS
all = new SectionList()
soma all.append()
iseg all.append()
dend1 all.append()
dend2 all.append()
dend3 all.append()
dend0 all.append()
somatic = new SectionList()
soma somatic.append()
basal = new SectionList()
dend1 basal.append()
dend2 basal.append()
dend3 basal.append()
dend0 basal.append()
AHIS = new SectionList()
iseg AHIS.append()
}
proc parameters() {
celsius = 36 // Temperature at which simulations are performed
v_init = -70 // mV, resting membrane potential
}
proc uninsert_Active_channels() {
soma {
uninsert NafSmb1
uninsert KdrSmb1
uninsert CaSmb1
}
iseg {
uninsert NafIsb1
uninsert NapIsb1
uninsert KdrIsb1
}
forsec "den" {
uninsert CaDen
}
print "Active channels has been removed from Soma , iseg , ah sections, please check the dendrites carefully"
}// End of Procedure
// Define nseg in every segment according to d_lambda
// for testing purposes.
external lambda_f
proc segments_numbers() {
D_LAMBDA = 0.1
forall { nseg = int((L/(D_LAMBDA*lambda_f(100))+0.9)/2)*2 + 1 }
} // End of Procedure
endtemplate Mousa2020