Synchronicity of fast-spiking interneurons balances medium-spiny neurons (Damodaran et al. 2014)

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Accession:156260
This study investigates the role of feedforward and feedback inhibition in maintaining the balance between D1 and D2 MSNs of the striatum. The synchronized firing of FSIs are found to be critical in this mechanism and specifically the gap junction connections between FSIs.
Reference:
1 . Damodaran S, Evans RC, Blackwell KT (2014) Synchronized firing of fast-spiking interneurons is critical to maintain balanced firing between direct and indirect pathway neurons of the striatum. J Neurophysiol 111:836-48 [PubMed]
Model Information (Click on a link to find other models with that property)
Model Type: Realistic Network;
Brain Region(s)/Organism:
Cell Type(s): Neostriatum medium spiny direct pathway neuron; Neostriatum medium spiny indirect pathway neuron; Neostriatum fast spiking interneuron;
Channel(s):
Gap Junctions: Gap junctions;
Receptor(s): NMDA; Gaba;
Gene(s):
Transmitter(s):
Simulation Environment: GENESIS;
Model Concept(s): Detailed Neuronal Models; Parkinson's;
Implementer(s): Blackwell, Avrama [avrama at gmu.edu]; Damodaran, Sriraman [dsriraman at gmail.com];
Search NeuronDB for information about:  Neostriatum medium spiny direct pathway neuron; Neostriatum medium spiny indirect pathway neuron; NMDA; Gaba;
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striatalnetwork
MScell
channels
unusedChannels
AddCaSpines.g *
addchans.g *
addchans.g~ *
addinput.g *
addoutput.g *
addoutput.g~
addoutput_old.g *
AddSynapticChannels.g *
connectCaChannels.g *
DA_files.txt *
globals.g
globals.g~
globals_old.g
globalsCaComp.g *
include_channels.g *
MScell.g~
MScell.p *
MScell_D1.g *
MScell_D1.g~
MScell_D1_old.g
MScell_D2.g *
MScell_D2.g~
MScell_D2_old.g
MScell08.p *
MScell08CM3_D1.p *
MScell08CM3_D2.p *
MScell08CM3_old.p
MScellSpine.g *
MScellSpineCtx.g *
MScellSpineTh.g *
MScellSyn.g~ *
MScellSyn_D1.g *
MScellSyn_D2.g *
parametersA.g~
parametersA_D1.g *
parametersA_D2.g *
parametersB.g *
parametersC.g *
parametersD.g *
proto.g *
proto.g~
spines.g *
SynParams.g~
SynParams_D1.g
SynParams_D2.g
SynParamsCtx.g *
SynParamsTh.g *
                            
//genesis

/***************************		MS Model, Version 5.12	**********************
**************************** 	     SynapticChannels.g 	**********************
Tom Sheehan tsheeha2@gmu.edu	thsheeha@vt.edu	703-538-8361
******************************************************************************/

/* needs work to remove need for caBuffer at this point */

function addNMDAchannel(compPath, chanpath,caBuffer, gbar, ghk)

  str compPath, chanpath
  float gbar
  str caBuffer 

  copy /library/{chanpath} {compPath}/{chanpath}
  addmsg {compPath} {compPath}/{chanpath}/block VOLTAGE Vm
  addmsg {compPath} {compPath}/{chanpath} VOLTAGE Vm
  if (ghk==0)
    addmsg {compPath}/{chanpath}/block {compPath} CHANNEL Gk Ek
  end

  if (ghk==1)
    addmsg {compPath} {compPath}/{chanName}/GHK VOLTAGE Vm
    addmsg {compPath}/{chanName}/GHK {compPath} CHANNEL Gk Ek
  end

  // Set the new conductance
  float len = {getfield {compPath} len}
  float dia = {getfield {compPath} dia}
  float pi = 3.141592653589793
  float surf = {len*dia*pi}

/*	echo "XXXXXXXXXXXXXXX addNMDAchannel XXXXXXXXXXXXXXXX"
	echo "compPath = "{compPath}
	echo "chanpath = "{chanpath}
	echo "caBuffer = "{caBuffer}
	echo "gbar = "{gbar}
	echo "XXXXXXXXXXXXXXX addNMDAchannel XXXXXXXXXXXXXXXX"
*/
//  setfield {compPath}/{chanName} gmax {surf*gbar}
  setfield {compPath}/{chanpath} gmax {gbar}

  // WE NEED TO ADD CA DYNAMICS, use 10% of current to CaL buffer


 if ({isa dif_shell  {compPath}/{caBuffer}} )         // dif_shell 
  //    echo spine calcium model is dif_shell
 addmsg {compPath}/{chanpath}/block {compPath}/{caBuffer} FINFLUX Ik 0.1
 
  elif ({isa Ca_concen {compPath}/{caBuffer}})      // Ca_conc
 //     echo spine calcium model is Ca_conc
 addmsg {compPath}/{chanpath}/block {compPath}/{caBuffer} fI_Ca Ik 0.1
  end


end


function addSynChannel (compPath, chanpath, gbar)

  str compPath, chanpath
  float gbar

  copy /library/{chanpath} {compPath}/{chanpath}

  addmsg {compPath} {compPath}/{chanpath} VOLTAGE Vm
  addmsg {compPath}/{chanpath} {compPath} CHANNEL Gk Ek

  // Set the new conductance
  float len = {getfield {compPath} len}
  float dia = {getfield {compPath} dia}
  float pi = 3.141592653589793
  float surf = {len*dia*pi}

/*	echo "XXXXXXXXXXXXXXX addSynChannel XXXXXXXXXXXXXXXX"
	echo "compPath = "{compPath}
	echo "chanpath = "{chanpath}
	echo "gbar = "{gbar}
	echo "XXXXXXXXXXXXXXX addSynchannel XXXXXXXXXXXXXXXX"
*/

//  setfield {compPath}/{chanName} gmax {surf*gbar}
  setfield {compPath}/{chanpath} gmax {gbar}
end
 
 

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