Amyloid-beta effects on release probability and integration at CA3-CA1 synapses (Romani et al. 2013)

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The role of amyloid beta (Aß) in brain function and in the pathogenesis of Alzheimer’s disease remains elusive. Recent publications reported that an increase in Aß concentration perturbs presynaptic release in hippocampal neurons, in particular by increasing release probability of CA3-CA1 synapses. The model predics how this alteration can affect synaptic plasticity and signal integration. The results suggest that the perturbation of release probability induced by increased Aß can significantly alter the spike probability of CA1 pyramidal neurons and thus contribute to abnormal hippocampal function during Alzheimer’s disease.
1 . Romani A, Marchetti C, Bianchi D, Leinekugel X, Poirazi P, Migliore M, Marie H (2013) Computational modeling of the effects of amyloid-beta on release probability at hippocampal synapses. Front Comput Neurosci 7:1 [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; Synapse;
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 Calcium; I_AHP;
Gap Junctions:
Receptor(s): AMPA;
Transmitter(s): Glutamate;
Simulation Environment: NEURON;
Model Concept(s): Synaptic Plasticity; Short-term Synaptic Plasticity; Facilitation; Depression; Synaptic Integration; Aging/Alzheimer`s;
Implementer(s): Bianchi, Daniela [danielabianchi12 -at-]; Romani, Armando [romani.armando -at-];
Search NeuronDB for information about:  Hippocampus CA1 pyramidal GLU cell; AMPA; I Na,t; I A; I K; I M; I h; I Calcium; I_AHP; 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 oblique branches in addition to 
// the primary list in apical-tip-list.hoc 
// written by Yiota Poirazi, July 2001,

objref apical_tip_list_addendum
apical_tip_list_addendum=new SectionList()

//    SISTER of apical_dendrite[3]   is apical_dendrite[2]    
//    SISTER of apical_dendrite[34]  is apical_dendrite[33]   
//    SISTER of apical_dendrite[37]  is apical_dendrite[36]   
//    SISTER of apical_dendrite[40]  is apical_dendrite[39]
//    SISTER of apical_dendrite[45]  is apical_dendrite[44]
//    SISTER of apical_dendrite[54]  is apical_dendrite[53] 
//    SISTER of apical_dendrite[68]  is apical_dendrite[67] 
//    SISTER of apical_dendrite[111] is apical_dendrite[110] 
//    SISTER of apical_dendrite[115] is apical_dendrite[114] 
//    SISTER of apical_dendrite[118] is apical_dendrite[117] 

  apical_dendrite[2]    apical_tip_list_addendum.append()  // 1 degree      69.9821  microns from soma
  apical_dendrite[33]   apical_tip_list_addendum.append()  // 2 degrees    177.4831 (vertical distance)
  apical_dendrite[36]   apical_tip_list_addendum.append()  // 2 degree     189.0447 
  apical_dendrite[37]   apical_tip_list_addendum.append()  // 2 degrees    180.5792 
  apical_dendrite[39]   apical_tip_list_addendum.append()  // 1 degree      83.7030
  apical_dendrite[40]   apical_tip_list_addendum.append()  // 1 degreee    102.6654
  apical_dendrite[44]   apical_tip_list_addendum.append()  // 0 degree     172.7760 
  apical_dendrite[47]   apical_tip_list_addendum.append()  // 0 degree.    177.4980
  apical_dendrite[53]   apical_tip_list_addendum.append()  // 3 degrees    202.8910
  apical_dendrite[54]   apical_tip_list_addendum.append()  // 3 degrees    190.3009
  apical_dendrite[67]   apical_tip_list_addendum.append()  // 2 degrees    289.5367   
  apical_dendrite[110]  apical_tip_list_addendum.append()  // 1 degree      98.7392
  apical_dendrite[114]  apical_tip_list_addendum.append()  // 1 degree     123.9962
  apical_dendrite[117]  apical_tip_list_addendum.append()  // 0 degree      67.6363

//  forsec apical_tip_list_addendum {
//    apical_tip_list.append()
//  }

/* Make a shape graph with the additional oblique branches

objref apical_tip_list_addendum_shape
color_index = 3
apical_tip_list_addendum_shape=new Shape()