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slo1unc2.mod
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slo1unc2.mod
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TITLE slo1unc2
: slo1 channels coupled with unc2 calcium channels (1:1 stoichiometry)
: From Nicoletti et al. PloS One 2019 (https://doi.org/10.1371/journal.pone.0218738)
UNITS {
(mA) = (milliamp)
(S) = (siemens)
(mV) = (millivolt)
(pS) = (picosiemens)
(molar)=(1/liter)
(uM) = (micromolar)
FARADAY = (faraday) (coulombs)
}
NEURON {
SUFFIX slo1unc2
USEION k READ ek WRITE ik
USEION ca READ eca
RANGE gbar
EXTERNAL munc2_unc2, hunc2_unc2
}
PARAMETER{
v (mV)
cai (uM)
bkg=0.05 (uM)
ek (mV)
eca (mV)
munc2_unc2
hunc2_unc2
celsius (degC)
gbar=.11 (S/cm2)
wom=3.152961 (/ms)
wyx=0.012643 (/mV)
kyx=34.338784 (uM)
nyx=0.000100 (1)
wop=0.156217 (/ms)
wxy=-0.027527 (/mV)
kxy=55.726186 (/ms)
nxy=1.299198 (1)
r=13e-9 (nm)
d=250e-12 (um2/s)
kb=500e6 (/M-s)
b=30e-6 (M)
gsc=40e-12 (S)
pi=3.14
va_unc2=-12.17 (mV)
ka_unc2=3.97 (mV)
vi_unc2=-52.47 (mV)
ki_unc2=5.6 (mV)
stm2=25 (mV)
sth2=25 (mV)
p1tmunc2=1.4969 (ms)
p2tmunc2=-8.1761 (mV)
p3tmunc2=9.0753 (mV)
p4tmunc2=15.3456 (mV)
p5tmunc2=0.1029 (ms)
p1thunc2=83.8037 (ms)
p2thunc2=52.8997 (mV)
p3thunc2=3.4557 (mV)
p4thunc2=72.0995 (ms)
p5thunc2=23.9009 (mV)
p6thunc2=3.5903 (mV)
shifthunc2=30
shiftmunc2=30
consthunc2=1.7
constmunc2=3
func2=1
f2unc2=1
fp3=1
fp4=1
fp5=1
}
ASSIGNED{
ik (mA/cm2)
g (S/cm2)
curr (mA/cm2)
minf
tslo1
alpha1
beta1
ts(ms)
v1
v2
ta (ms)
ti (ms)
}
STATE {
m
}
BREAKPOINT {
SOLVE states METHOD cnexp
ik = gbar*m*hunc2_unc2*(v-ek)
}
INITIAL {
rates(calcium(v), v)
m=minf
}
DERIVATIVE states {
rates(calcium(v), v)
m' = (minf - m)/tslo1
}
PROCEDURE rates(calcium(v),v (mV)){
alpha1=minfUNC2(v)/tmUNC2(v)
beta1=(1/tmUNC2(v))-alpha1
minf=(munc2_unc2*kop(calcium(v),v)*(alpha1+beta1+kcm(v)))/((kop(calcium(v),v)+kom(calcium(v),v))*(kcm(v)+alpha1)+(beta1*kcm(v)))
tslo1=((alpha1+beta1+kcm(v))/((kop(calcium(v),v)+kom(calcium(v),v))*(kcm(v)+alpha1)+(beta1*kcm(v))))
}
FUNCTION kcm(v (mV)){
kcm=wom*exp(-wyx*v)*(1/(1+((bkg/kyx)^nyx)))
}
FUNCTION kom(calcium(v),v (mV)){
kom=wom*exp(-wyx*v)*(1/(1+pow(calcium(v)/kyx,nyx)))
}
FUNCTION kop(calcium(v),v (mV)){
kop=wop*exp(-wxy*v)*(1/(1+pow(kxy/calcium(v),nxy)))
}
FUNCTION calcium(v (mV)){
calcium=(((fabs(gsc*(v-eca)*1e-3)/(8*pi*r*d*FARADAY))*exp(-r/sqrt(d/(kb*b))))*1e6*1e-3)+bkg
}
FUNCTION minfUNC2(v(mV)){
UNITSOFF
minfUNC2=1/(1+exp(-(v-va_unc2+stm2)/(ka_unc2*func2)))
UNITSON
}
FUNCTION hinfUNC2(v(mV)){
UNITSOFF
hinfUNC2= 1/(1+exp((v-vi_unc2+sth2)/(ki_unc2*f2unc2)))
UNITSON
}
FUNCTION tmUNC2(v(mV)){
UNITSOFF
tmUNC2=(p1tmunc2/(exp(-(v-p2tmunc2+shiftmunc2)/p3tmunc2)+exp((v-p2tmunc2+shiftmunc2)/p4tmunc2))+p5tmunc2)*constmunc2
UNITSON
}
FUNCTION thunc2(v(mV)){
UNITSOFF
thunc2=(p1thunc2/(1+exp((v-p2thunc2+shifthunc2)/(p3thunc2*fp5)))+p4thunc2/(1+exp(-(v-p5thunc2+shifthunc2)/(p6thunc2*fp5))))*consthunc2
UNITSON
}