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Calcium influx during striatal upstates (Evans et al. 2013)

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Accession:150912
"... To investigate the mechanisms that underlie the relationship between calcium and AP timing, we have developed a realistic biophysical model of a medium spiny neuron (MSN). ... Using this model, we found that either the slow inactivation of dendritic sodium channels (NaSI) or the calcium inactivation of voltage-gated calcium channels (CDI) can cause high calcium corresponding to early APs and lower calcium corresponding to later APs. We found that only CDI can account for the experimental observation that sensitivity to AP timing is dependent on NMDA receptors. Additional simulations demonstrated a mechanism by which MSNs can dynamically modulate their sensitivity to AP timing and show that sensitivity to specifically timed pre- and postsynaptic pairings (as in spike timing-dependent plasticity protocols) is altered by the timing of the pairing within the upstate. …"
Reference:
1 . Evans RC, Maniar YM, Blackwell KT (2013) Dynamic modulation of spike timing-dependent calcium influx during corticostriatal upstates. J Neurophysiol 110:1631-45 [PubMed]
Model Information (Click on a link to find other models with that property)
Model Type: Neuron or other electrically excitable cell;
Brain Region(s)/Organism: Striatum;
Cell Type(s): Neostriatum medium spiny direct pathway GABA cell;
Channel(s): I Na,t; I L high threshold; I N; I A; I K; I K,Ca; I A, slow; I Krp; I R;
Gap Junctions:
Receptor(s): AMPA; NMDA; Gaba;
Gene(s): Cav1.3 CACNA1D; Cav1.2 CACNA1C; Cav2.2 CACNA1B;
Transmitter(s):
Simulation Environment: GENESIS;
Model Concept(s): Oscillations; STDP; Calcium dynamics;
Implementer(s): Evans, Rebekah [Rebekah.Evans at nih.gov];
Search NeuronDB for information about:  Neostriatum medium spiny direct pathway GABA cell; AMPA; NMDA; Gaba; I Na,t; I L high threshold; I N; I A; I K; I K,Ca; I A, slow; I Krp; I R; 
//genesis
//include_channels.g v9.1
/*******
Rebekah Evans updated 3/20/12
include_channels.g is included in proto.g file
**********/

include MScell/channels/tabchanforms.g

//voltage dependent channels
include MScell/channels/NaF	
include MScell/channels/NaFslowinact		//double checked RCE 3/23/12, realized htau has qfact 2 taken into account, but not mtau. no changes made, but will test qfact
include MScell/channels/KaF  			//double checked RCE 3/21/12 fine, no changes.  triple checked with genesis _____
include MScell/channels/Kir			//double checked RCE 3/22/12 fine, no changes. triple checked with genesis ____
include MScell/channels/KaS			//double checked RCE 3/22/12 fine, no changes. triple checked with genesis _____
include MScell/channels/Krp			//adjusted 3/22/12 RCE double checked _____ triple checked with genesis _____

//calcium channels
include MScell/channels/CaL12CDI  	//adjusted 3/20/12 RCE double checked _______  triple checked with genesis _____
include MScell/channels/CaL13CDI  	//adjusted 3/20/12 RCE double checked _______ triple checked with genesis _____
include MScell/channels/CaNCDI		  //adjusted 3/20/12 RCE double checked _______ triple checked with genesis _____
include MScell/channels/CaRCDI		  //adjusted 3/20/12 RCE double checked _______ triple checked with genesis _____
include MScell/channels/CaT 	 	 //adjusted 3/20/12 RCE double checked _______ triple checked with genesis _____



//calcium dependent potassium channels
include MScell/channels/BK			//double checked RCE 3/22/12 fine, no changes made.  
include MScell/channels/SK			//double checked RCE 3/23/12 fine, no changes made.

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