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; 

function add_output
	create asc_file /output/plot_out
	setfield /output/plot_out   flush 1  leave_open 1 append 1 \
          float_format %0.6g
    useclock /output/plot_out 1
	addmsg /cell/soma /output/plot_out  SAVE Vm

	addmsg /cell/tertdend1_1/fluorescence /output/plot_out SAVE ratio
	addmsg /cell/tertdend5_1/fluorescence /output/plot_out SAVE ratio
	addmsg /cell/tertdend9_1/fluorescence /output/plot_out SAVE ratio

	addmsg /cell/tertdend1_1/NR2A/GHK /output/plot_out SAVE Ik
	addmsg /cell/tertdend1_1/NR2A/block /output/plot_out SAVE Ik
	addmsg /cell/tertdend5_1/NR2A/GHK /output/plot_out SAVE Ik
	addmsg /cell/tertdend5_1/NR2A/block /output/plot_out SAVE Ik
	addmsg /cell/tertdend9_1/NR2A/GHK /output/plot_out SAVE Ik
	addmsg /cell/tertdend9_1/NR2A/block /output/plot_out SAVE Ik


	addmsg /cell/tertdend1_1/CaL12_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend5_1/CaL12_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend9_1/CaL12_channelGHK /output/plot_out SAVE ratio

	addmsg /cell/tertdend1_1/CaL13_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend5_1/CaL13_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend9_1/CaL13_channelGHK /output/plot_out SAVE ratio

	addmsg /cell/tertdend1_1/CaN_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend5_1/CaN_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend9_1/CaN_channelGHK /output/plot_out SAVE ratio

	addmsg /cell/tertdend1_1/CaT_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend5_1/CaT_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend9_1/CaT_channelGHK /output/plot_out SAVE ratio

	addmsg /cell/tertdend1_1/CaR_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend5_1/CaR_channelGHK /output/plot_out SAVE ratio
	addmsg /cell/tertdend9_1/CaR_channelGHK /output/plot_out SAVE ratio
end

/* copy into file: 
call /output/plot_out OUT_OPEN
call /output/plot_out OUT_WRITE "time SomaVm tert1fura tert5fura tert9fura tert1nmdaGHK tert1block tert5nmdaGHK tert5block tert9nmdaGHK tert9block tert1L12 tert5L12 tert9L12 tert1L13 tert5L13 tert9L13 tert1N tert5N tert9N tert1T tert5T tert9T tert1R tert5R tert9T" //header	
*/

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