CA1 pyramidal neuron: depolarization block (Bianchi et al. 2012)

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NEURON files from the paper: On the mechanisms underlying the depolarization block in the spiking dynamics of CA1 pyramidal neurons by D.Bianchi, A. Marasco, A.Limongiello, C.Marchetti, H.Marie,B.Tirozzi, M.Migliore (2012). J Comput. Neurosci. In press. DOI: 10.1007/s10827-012-0383-y. Experimental findings shown that under sustained input current of increasing strength neurons eventually stop firing, entering a depolarization block. We analyze the spiking dynamics of CA1 pyramidal neuron models using the same set of ionic currents on both an accurate morphological reconstruction and on its reduction to a single-compartment. The results show the specic ion channel properties and kinetics that are needed to reproduce the experimental findings, and how their interplay can drastically modulate the neuronal dynamics and the input current range leading to depolarization block.
1 . Bianchi D, Marasco A, Limongiello A, Marchetti C, Marie H, Tirozzi B, Migliore M (2012) On the mechanisms underlying the depolarization block in the spiking dynamics of CA1 pyramidal neurons. J Comput Neurosci 33:207-25 [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;
Brain Region(s)/Organism: Hippocampus;
Cell Type(s): Hippocampus CA1 pyramidal GLU cell;
Channel(s): I Na,t; I A; I K; I M; I h; I K,Ca; I_AHP;
Gap Junctions:
Receptor(s): GabaA; AMPA; NMDA;
Transmitter(s): Gaba; Glutamate;
Simulation Environment: NEURON; Mathematica;
Model Concept(s): Simplified Models; Depolarization block; Bifurcation;
Implementer(s): Bianchi, Daniela [danielabianchi12 -at-]; Limongiello, Alessandro [alessandro.limongiello at];
Search NeuronDB for information about:  Hippocampus CA1 pyramidal GLU cell; GabaA; AMPA; NMDA; I Na,t; I A; I K; I M; I h; I K,Ca; I_AHP; Gaba; Glutamate;
apical-non-trunk-list.hoc *
apical-tip-list.hoc *
apical-tip-list-addendum.hoc *
apical-trunk-list.hoc *
axon-sec-list.hoc *
basal-paths.hoc *
basal-tree-list.hoc *
cell.hoc *
cell-analysis.hoc *
n123.hoc *
oblique-paths.hoc *
peri-trunk-list.hoc *
soma-list.hoc *
// This function makes a list with primary oblique dendrites
// written by Yiota Poirazi, July 2001,

objref apical_tip_list
apical_tip_list=new SectionList()

// List of obliques located at distances approximatelly less than 300 microns from the soma

proc proximals() {

  apical_dendrite[3]    apical_tip_list.append()   // 1 degree                 74.4  microns from soma
  apical_dendrite[5]    apical_tip_list.append()   // 0 degree                 57.46 (vertical distance)
  apical_dendrite[24]   apical_tip_list.append()   // 0 degree                 92.05
  apical_dendrite[30]   apical_tip_list.append()   // 0 degree  (essentially) 153.44
  apical_dendrite[34]   apical_tip_list.append()   // 2 degrees (ignore 3rd)  215.06
  apical_dendrite[45]   apical_tip_list.append()   // 0 degree. (essentially) 170.32
  apical_dendrite[51]   apical_tip_list.append()   // 2 degrees               210.93
  apical_dendrite[59]   apical_tip_list.append()   //                         189.34
  apical_dendrite[61]   apical_tip_list.append()   //                         221.55
  apical_dendrite[63]   apical_tip_list.append()   //                         231.58
  apical_dendrite[68]   apical_tip_list.append()   // 2 degrees               277.48
  apical_dendrite[70]   apical_tip_list.append()   // 0 degree                300.94
  apical_dendrite[106]  apical_tip_list.append()   // 0 degree                258.05
  apical_dendrite[107]  apical_tip_list.append()   // 0 degree                159.55      
  apical_dendrite[111]  apical_tip_list.append()   // 1 degree                106.30
  apical_dendrite[112]  apical_tip_list.append()   // 0 degree                 88.52
  apical_dendrite[115]  apical_tip_list.append()   // 1 degree                117.79
  apical_dendrite[118]  apical_tip_list.append()   // 0 degree                 81.66

// List of obliques located beyond 300 microns from the soma

proc distals() {    
  apical_dendrite[73]   apical_tip_list.append()   // 0 degree                334.84 
  apical_dendrite[82]   apical_tip_list.append()   // 0 degree                360.28
  apical_dendrite[86]   apical_tip_list.append()   // 0 degree                419.68
  apical_dendrite[93]   apical_tip_list.append()   // 0 degree                468.60
  apical_dendrite[97]   apical_tip_list.append()   // 0 degree                445.90
  apical_dendrite[105]  apical_tip_list.append()   // 0 degree                425.58


/* Make a shape graph with apical oblique dendrites
objref apical_tip_list_shape
color_index = 2
apical_tip_list_shape=new Shape()