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]
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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; 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; 
//genesis cicr-func.g
// sets up cicr objects and communication between them
// parameters are ai, bi, gi = alphai/k3, betai/k3, gammai/k3 from Li & Rinzel
// L&R units are per uM-sec  = per mM-msec

/* revised 02-11-02 for uM-msec units */
/* a_0xx = alpha_0xx/0.1 uM, a_0xx= 40 per sec/0.1 uM = 400 per sec uM
   = 400e-3 per msec uM
   b_1x0 = alpha_11x = 52 per sec -> 52e-3 per msec  (no change)
   b_1x1 = alpha_10x = 377.36 per sec -> 377.36e-3 per msec   (no change)
 other rate constants (beta and gamma) depend on calcium - no change */

function makeiicr(path)
   str path
	
   create cicr {path}/x000
   setfield {path}/x000 \
	alpha_state	0 \
	beta_state	0 \
	gamma_state	0 \
	alpha	400e-3 \
	beta	2e1 \
	gamma	2e-1 \
	conserve	0 \
	xinit		{init000} \
	xmin		0 \
	xmax		1
	
   create cicr {path}/x100
   setfield ^ \
	alpha_state	1 \
	beta_state	0 \
	gamma_state	0 \
	alpha	52e-3 \
	beta	2e1 \
	gamma	2e-1 \
	conserve	0 \
	xinit		{init100} \
	xmin		0 \
	xmax		1 
	
   create cicr {path}/x010
   setfield ^ \
	alpha_state	0 \
	beta_state	1 \
	gamma_state	0 \
	alpha	400e-3 \
	beta	1.6468e-3 \
	gamma	2e-1 \
	conserve	0 \
	xinit		{init010} \
	xmin		0 \
	xmax		1
	
   create cicr {path}/x001
   setfield ^ \
	alpha_state	0 \
	beta_state	0 \
	gamma_state	1 \
	alpha	400e-3 \
	beta	2e1 \
	gamma	0.0289e-3 \
	conserve	0 \
	xinit		{init001} \
	xmin		0 \
	xmax		1
	
   create cicr {path}/x101
   setfield ^ \
	alpha_state	1 \
	beta_state	0 \
	gamma_state	1 \
	alpha	377.36e-3 \
	beta	2e1 \
	gamma	0.2089e-3 \
	conserve	0 \
	xinit		{init101} \
	xmin		0 \
	xmax		1
	
   create cicr {path}/x011
   setfield ^ \
	alpha_state	0 \
	beta_state	1 \
	gamma_state	1 \
	alpha	400e-3 \
	beta	1.6468e-3 \
	gamma	0.0289e-3 \
	conserve	0 \
	xinit		{init011} \
	xmin		0 \
	xmax		1

   create cicr {path}/x110
   setfield ^ \
	alpha_state	1 \
	beta_state	1 \
	gamma_state	0 \
	alpha	52e-3 \
	beta	1.6468e-3 \
	gamma	2e-1 \
	conserve	0 \
	xinit		{init110} \
	xmin		0  \
	xmax		1
	
   create cicr {path}/x111
   setfield ^ \
	alpha_state	1 \
	beta_state	1 \
	gamma_state	1 \
	alpha	377.36e-3 \
	beta	1.6468e-3 \
	gamma	0.2098e-3 \
	conserve	1 \
	xinit		{1-init000-init100-init010-init001-init101-init110-init011} \
	xmin		0  \
	xmax		1

addmsg {path}/x100 {path}/x000 ASTATE alpha fraction
addmsg {path}/x010 {path}/x000 BSTATE beta fraction
addmsg {path}/x001 {path}/x000 GSTATE gamma fraction
	
addmsg {path}/x000 {path}/x100 ASTATE alpha previous_state
addmsg {path}/x110 {path}/x100 BSTATE beta fraction
addmsg {path}/x101 {path}/x100 GSTATE gamma fraction
	
addmsg {path}/x110 {path}/x010 ASTATE alpha fraction
addmsg {path}/x000 {path}/x010 BSTATE beta previous_state
addmsg {path}/x011 {path}/x010 GSTATE gamma fraction
	
addmsg {path}/x101 {path}/x001 ASTATE alpha fraction
addmsg {path}/x011 {path}/x001 BSTATE beta fraction
addmsg {path}/x000 {path}/x001 GSTATE gamma previous_state
	
addmsg {path}/x010 {path}/x110 ASTATE alpha previous_state
addmsg {path}/x100 {path}/x110 BSTATE beta previous_state
addmsg {path}/x111 {path}/x110 GSTATE gamma fraction
	
addmsg {path}/x001 {path}/x101 ASTATE alpha previous_state
addmsg {path}/x111 {path}/x101 BSTATE beta fraction
addmsg {path}/x100 {path}/x101 GSTATE gamma previous_state
	
addmsg {path}/x111 {path}/x011 ASTATE alpha fraction
addmsg {path}/x001 {path}/x011 BSTATE beta previous_state
addmsg {path}/x010 {path}/x011 GSTATE gamma previous_state

addmsg {path}/x000 {path}/x111 CONSERVE previous_state
addmsg {path}/x001 {path}/x111 CONSERVE previous_state
addmsg {path}/x010 {path}/x111 CONSERVE previous_state
addmsg {path}/x100 {path}/x111 CONSERVE previous_state
addmsg {path}/x110 {path}/x111 CONSERVE previous_state
addmsg {path}/x101 {path}/x111 CONSERVE previous_state
addmsg {path}/x011 {path}/x111 CONSERVE previous_state

end