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Spike timing detection in different forms of LTD (Doi et al 2005)
Accession: 49305
To understand the spike-timing detection mechanisms in cerebellar long-term depression (LTD), we developed a kinetic model of Ca dynamics within a Purkinje dendritic spine. In our kinetic simulation, IP3 was first produced via the metabotropic pathway of parallel fiber (PF) inputs, and the Ca influx in response to the climbing fiber (CF) input triggered regenerative Ca-induced Ca release from the internal stores via the IP3 receptors activated by the increased IP3. The delay in IP3 increase caused by the PF metabotropic pathway generated the optimal PF–CF interval. The Ca dynamics revealed a threshold for large Ca2 release that decreased as IP3 increased, and it coherently explained the different forms of LTD. See paper for more and details.
Reference: Doi T, Kuroda S, Michikawa T, Kawato M (2005) Inositol 1,4,5-trisphosphate-dependent Ca2+ threshold dynamics detect spike timing in cerebellar Purkinje cells. J Neurosci 25:950-61 [PubMed]
Citations  Citation Browser
Model Information (Click on a link to find other models with that property)
Model Type:  Synapse;
Brain Region(s)/Organism:  
Cell Type(s):  Cerebellar purkinje cell;  
Channel(s):  I Calcium;  
Gap Junctions:  
Receptor(s):  
Gene(s):  
Transmitter(s):  Glutamate;
Simulation Environment:  GENESIS (web link to model); MATLAB;
Model Concept(s):  Coincidence Detection; Synaptic Plasticity; Depression; Signaling pathways; Calcium dynamics;
Implementer(s):  
Search NeuronDB for information about:  Cerebellar purkinje cell; I Calcium; Glutamate;
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DoiEtAl2005WebLink
readme.html
                            
Purkinje Ca, LTD Note: Click here for the model tar.gz file (available under a link from this next page).


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Instruction for demo simulations that generate the simulation figures in

Tomokazu Doi, Shinya Kuroda, Takayuki Michikawa, and Mitsuo Kawato
Inositol 1,4,5-Tripshosphate-Dependent Ca2+ Threshold Dynamics Detect Spike Timing in Cerebellar Purkinje Cells.
The Journal of Neuroscience 25(4): 950-961, 2005


The simulation requires GENESIS version 2.2 and kinetikit version 9 or higher. Both of which are included in the compressed file you have downloaded. We have confirmed that our simulation scripts run on Red Hat Linux version 8 and Pentium 4 PCs. If you have a problem, please contact at xtomdoi@atr.jp.


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HOW TO RUN DEMOS


To extract doiJNSdemo.tar.gz, type

tar zxvf doiJNSdemo.tar.gz


The created directory has several files named fig*.g. To run demos, just type

genesis fig3.g
(or choose other files named fig*.g)

GENESIS/kinetikit includes model scripts for the simulation, and displays and saves simulation results in 'simresult/fig*/'. In simresult/fig*/, there are MALTAB scripts files (*.m) which display the simulation results as in the JNS paper. Comments in fig*.g might be useful to understand how GENESIS/kinetikit works.

Some simulations take enormous time, more than months. Here is a list of expected time for simulation on a 2 GHz Pentium 4 PC.


fig3.g 4 min
fig4.g 12 min
fig5.g 20 min
fig6A.g 3 min
fig6B.g 7 hrs
fig6C.g 3 min
fig7A.g 12 min
fig7B.g 9 hrs
fig8CDE.g 80 min
fig8F.g 10 days
fig9.g 25 min
fig11A.g 4 min
figS2A.g 12 min
figS2BCDE.g 1 day
figS2F.g 27 hrs
figS2G.g 4 hrs
figS2HIJK.g 120 days



To load the model scripts without demos, type
genesis DoiCaModel.g

All of the model parameters has notes in the scripts, which are identical to Supplemental Tables 1-3.

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Tomoakazu Doi,
ATR Computational Neuroscience Labs,
26 Jan 2005
xtomdoi@atr.jp


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