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

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Accession:143719
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.
Reference:
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]
Citations  Citation Browser
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 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;
Gene(s):
Transmitter(s): Gaba; Glutamate;
Simulation Environment: NEURON; Mathematica;
Model Concept(s): Simplified Models; Depolarization block; Bifurcation;
Implementer(s): Bianchi, Daniela [danielabianchi12 -at- gmail.com]; Limongiello, Alessandro [alessandro.limongiello at unina.it];
Search NeuronDB for information about:  Hippocampus CA1 pyramidal cell; GabaA; AMPA; NMDA; I Na,t; I A; I K; I M; I h; I K,Ca; I_AHP; Gaba; Glutamate;
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Ca1_Bianchi
template
BasalPath.hoc *
ExperimentControl.hoc *
load_templates.hoc
ObliquePath.hoc *
RangeRef.hoc *
                            
// This template creates the Basal Path lists, starting from the
// section attached to the trunk and ending with the basal tip section 
// written by Terrence Brannon, modified by Yiota Poirazi, July 2001, poirazi@LNC.usc.edu

begintemplate ObliquePath

public dtrunk_to_tip, trunk_section, root_oblique

strdef sexec

objref trunk_section
strdef trunk_section_name

objref root_oblique
strdef root_oblique_name

objref tip_section
strdef tip_section_name

objref oblique_path

proc init () {
  sec_count=0

  forsec $o1 {

    if (sec_count==1) {
       root_oblique    = new SectionRef()
       root_oblique_name=secname()
    }
      
    if (!sec_count) {
       distance(0,1)
       trunk_section  = new SectionRef()
       trunk_section_name=secname()
      }
    sec_count=sec_count+1

    tip_section    = new SectionRef()
    tip_section_name=secname()
  }

  access root_oblique.sec
  distance(0,0)
  access tip_section.sec
  dtrunk_to_tip=distance(1,1)

//  printf("ObliquePath trunk_section: %s root_oblique: %s tip_section: %s distance between root_oblique and tip_section: %g\n", trunk_section_name, root_oblique_name, tip_section_name, dtrunk_to_tip)
}

endtemplate ObliquePath