Library of biophysically detailed striatal projection neurons (Lindroos and Hellgren Kotaleski 2020)

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Library of compartmentalized models used to investigate dendritic integration in striatal projection neurons under neuromodulation.
1 . Lindroos R, Hellgren Kotaleski J (2020) Predicting complex spikes in striatal projection neurons of the direct pathway following neuromodulation by acetylcholine and dopamine. Eur J Neurosci [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; Synapse;
Brain Region(s)/Organism: Striatum; Hippocampus; Basal ganglia;
Cell Type(s): Neostriatum medium spiny direct pathway GABA cell; Neostriatum medium spiny indirect pathway GABA cell; Striatal projection neuron;
Channel(s): I M; I Potassium;
Gap Junctions:
Transmitter(s): Acetylcholine; Dopamine;
Simulation Environment: NEURON; Python;
Model Concept(s): Active Dendrites; Detailed Neuronal Models; Neuromodulation; Synaptic Plasticity; Activity Patterns; Soma-dendrite cross-talk;
Implementer(s): Lindroos, Robert [robert.lindroos at]; Filipovic, Marko;
Search NeuronDB for information about:  Neostriatum medium spiny direct pathway GABA cell; Neostriatum medium spiny indirect pathway GABA cell; I M; I Potassium; Acetylcholine; Dopamine;
TITLE Fast A-type potassium current (Kv4.2)


neuromodulation is added as functions:
    modulation = 1 + damod*(maxMod-1)*level

    damod  [0]: is a switch for turning modulation on or off {1/0}
    maxMod [1]: is the maximum modulation for this specific channel (read from the param file)
                e.g. 10% increase would correspond to a factor of 1.1 (100% +10%) {0-inf}
    level  [0]: is an additional parameter for scaling modulation. 
                Can be used simulate non static modulation by gradually changing the value from 0 to 1 {0-1}

[] == default values
{} == ranges

    SUFFIX kaf_ms
    RANGE gbar, gk, ik, q
    RANGE damod, maxMod, level

    (S) = (siemens)
    (mV) = (millivolt)
    (mA) = (milliamp)

    gbar = 0.0 (S/cm2) 
    q = 1	: room temperature (unspecified)
    :q = 2	: body temperature 35 C (Du 2017)
    :q = 3	: body temperature 35 C
    damod = 0
    maxMod = 1
    level = 0

    v (mV)
    ek (mV)
    ik (mA/cm2)
    gk (S/cm2)
    mtau (ms)
    htau (ms)

STATE { m h }

    SOLVE states METHOD cnexp
    gk = gbar*m*m*h*modulation()
    ik = gk*(v-ek)

    m' = (minf-m)/mtau*q
    h' = (hinf-h)/htau*q

    m = minf
    h = hinf

PROCEDURE rates() {
    minf = 1/(1+exp((v-(-10))/(-17.7)))
    mtau = 0.9+1.1/(1+exp((v-(-30))/10))
    hinf = 1/(1+exp((v-(-75.6))/11.8))
    htau = 14

    :Du 2017
    :LOCAL alpha, beta, sum
    :alpha = 1.5/(1+exp((v-4)/(-17)))
    :beta = 0.6/(1+exp((v-10)/9))
    :sum = alpha+beta
    :minf = alpha/sum
    :mtau = 1/sum
    :alpha = 0.105/(1+exp((v-(-121))/22))
    :beta = 0.065/(1+exp((v-(-55))/(-11)))
    :sum = alpha+beta
    :hinf = alpha/sum
    :htau = 1/sum

FUNCTION modulation() {
    : returns modulation factor
    modulation = 1 + damod*(maxMod-1)*level 


Original data by Tkatch et al (2000) [1]. Neostriatal neurons were acutely
dissociated from young adult rats, age P28-P42.  Electrophysiological
recordings were done at unspecified temperature (room temperature 20-22 C
assumed). Potentials were not corrected for the liquid junction potential
(estimated 1-2 mV).

Activation m^1 matches experimental data [1, Fig.2C]. Activation time
constants fit tabulated data [1, Fig.2B].  Slope of inactivation function
fitted to the data [1, Fig.3B] with half inactivation potential -75.6
mV. Temperature factor q between 1.5 [3] and 3 [2] was used for body
temperature.  Conductance kinetics of m2h type is used [2], no corrections
for m^2 applied. Later modification by Du [4] is close to this model.

[1] Tkatch T, Baranauskas G, Surmeier DJ (2000) Kv4.2 mRNA abundance and
A-type K(+) current amplitude are linearly related in basal ganglia and
basal forebrain neurons. J Neurosci 20(2):579-88.

[2] Wolf JA, Moyer JT, Lazarewicz MT, Contreras D, Benoit-Marand M,
O'Donnell P, Finkel LH (2005) NMDA/AMPA ratio impacts state transitions
and entrainment to oscillations in a computational model of the nucleus
accumbens medium spiny projection neuron. J Neurosci 25(40):9080-95.

[3]  Evans RC, Morera-Herreras T, Cui Y, Du K, Sheehan T, Kotaleski JH,
Venance L, Blackwell KT (2012) The effects of NMDA subunit composition on
calcium influx and spike timing-dependent plasticity in striatal medium
spiny neurons. PLoS Comput Biol 8(4):e1002493.

[4] Du K, Wu YW, Lindroos R, Liu Y, Rózsa B, Katona G, Ding JB,
Kotaleski JH (2017) Cell-type-specific inhibition of the dendritic
plateau potential in striatal spiny projection neurons. Proc Natl Acad
Sci USA 114:E7612-E7621.