Paired turbulence and light effect on calcium increase in Hermissenda (Blackwell 2004)

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Accession:53427
The sea slug Hermissenda learns to associate light and hair cell stimulation, but not when the stimuli are temporally uncorrelated...These issues were addressed using a multi-compartmental computer model of phototransduction, calcium dynamics, and ionic currents of the Hermissenda photoreceptor...simulations show that a potassium leak channel, which closes with an increase in calcium, is required to produce both the untrained LLD and the enhanced LLD due to the decrease in voltage dependent potassium currents.
Reference:
1 . Blackwell KT (2004) Paired turbulence and light do not produce a supralinear calcium increase in Hermissenda. J Comput Neurosci 17:81-99 [PubMed]
Model Information (Click on a link to find other models with that property)
Model Type: Neuron or other electrically excitable cell; Electrogenic pump;
Brain Region(s)/Organism:
Cell Type(s): Hermissenda photoreceptor Type B;
Channel(s): I A; I K,leak; I h; I K,Ca; I Sodium; I Calcium; I Potassium;
Gap Junctions:
Receptor(s): GabaA; GabaB; IP3;
Gene(s):
Transmitter(s): Gaba;
Simulation Environment: Chemesis;
Model Concept(s): Temporal Pattern Generation; Invertebrate; Signaling pathways; Calcium dynamics;
Implementer(s): Blackwell, Avrama [avrama at gmu.edu];
Search NeuronDB for information about:  GabaA; GabaB; IP3; I A; I K,leak; I h; I K,Ca; I Sodium; I Calcium; I Potassium; Gaba;
/*total-currents.g*/
/* total kleak currents */

create diffamp /axon/vm[1]/kleak_total
setfield ^ gain 1.0 saturation 999
create diffamp /axon/vm[1]/gkleak_total
setfield ^ gain 1.0 saturation 999
for (i=1; i<=25; i=i+1)
   addmsg /axon/Cacyts1[{i}]/kleak /axon/vm[1]/kleak_total PLUS I
   addmsg /axon/Cacyts1[{i}]/kleak /axon/vm[1]/gkleak_total PLUS G
end

create diffamp /axon/vm[2]/kleak_total
setfield ^ gain 1.0 saturation 999
create diffamp /axon/vm[2]/gkleak_total
setfield ^ gain 1.0 saturation 999
for (i=26; i<=50; i=i+1)
   addmsg /axon/Cacyts1[{i}]/kleak /axon/vm[2]/kleak_total PLUS I
   addmsg /axon/Cacyts1[{i}]/kleak /axon/vm[2]/gkleak_total PLUS G
end

create diffamp /axon/vm[3]/kleak_total
setfield ^ gain 1.0 saturation 999
create diffamp /axon/vm[3]/gkleak_total
setfield ^ gain 1.0 saturation 999
for (i=51; i<=75; i=i+1)
  addmsg /axon/Cacyts1[{i}]/kleak /axon/vm[3]/kleak_total PLUS I
  addmsg /axon/Cacyts1[{i}]/kleak /axon/vm[3]/gkleak_total PLUS G
end

create diffamp /axon/vm[4]/kleak_total
setfield ^ gain 1.0 saturation 999
create diffamp /axon/vm[4]/gkleak_total
setfield ^ gain 1.0 saturation 999
for (i=76; i<=100; i=i+1)
  addmsg /axon/Cacyts1[{i}]/kleak /axon/vm[4]/kleak_total PLUS I
  addmsg /axon/Cacyts1[{i}]/kleak /axon/vm[4]/gkleak_total PLUS G
end

create diffamp /soma/cashell
setfield ^ gain 1.0 saturation 10
create diffamp /soma/vm[1]/pca
setfield ^ gain 1.0 saturation 999
create diffamp /soma/vm[1]/tca
setfield ^ gain 1.0 saturation 999
create diffamp /soma/vm[1]/kc_total
setfield ^ gain 1.0 saturation 999
create diffamp /soma/vm[1]/kleak_total
setfield ^ gain 1.0 saturation 999
create diffamp /soma/vm[1]/gleak_total
setfield ^ gain 1.0 saturation 999
create diffamp /soma/vm[1]/ncx
setfield ^ gain 1.0 saturation 999
create diffamp /soma/vm[1]/pmca
setfield ^ gain 1.0 saturation 1e9

for (i=1; i<=24; i=i+1)
  addmsg /soma/Cacyts1[{i}]/ncx /soma/vm[1]/ncx PLUS I
  addmsg /soma/Cacyts1[{i}]/pmca /soma/vm[1]/pmca PLUS moles_out
  addmsg /soma/Cacyts1[{i}] /soma/cashell PLUS Conc
  addmsg /soma/Cacyts1[{i}]/persist_ghk_ica /soma/vm[1]/pca PLUS I
  addmsg /soma/Cacyts1[{i}]/trans_ghk_ica /soma/vm[1]/tca PLUS I
  addmsg /soma/Cacyts1[{i}]/kc /soma/vm[1]/kc_total PLUS I
  addmsg /soma/Cacyts1[{i}]/kleak /soma/vm[1]/kleak_total PLUS I
  addmsg /soma/Cacyts1[{i}]/kleak /soma/vm[1]/gleak_total PLUS G
end



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