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Infraslow intrinsic rhythmogenesis in a subset of AOB projection neurons (Gorin et al 2016)

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We investigated patterns of spontaneous neuronal activity in mouse accessory olfactory bulb mitral cells, the direct neural link between vomeronasal sensory input and limbic output. Both in vitro and in vivo, we identify a subpopulation of mitral cells that exhibit slow stereotypical rhythmic discharge. In intrinsically rhythmogenic neurons, these periodic activity patterns are maintained in absence of fast synaptic drive. The physiological mechanism underlying mitral cell autorhythmicity involves cyclic activation of three interdependent ionic conductances: subthreshold persistent Na(+) current, R-type Ca(2+) current, and Ca(2+)-activated big conductance K(+) current. Together, the interplay of these distinct conductances triggers infraslow intrinsic oscillations with remarkable periodicity, a default output state likely to affect sensory processing in limbic circuits. The model reproduces the intrinsic firing in a reconstructed single AOB mitral cell with ion channels kinetics fitted to experimental measurements of their steady state and time course.
1 . Gorin M, Tsitoura C, Kahan A, Watznauer K, Drose DR, Arts M, Mathar R, O'Connor S, Hanganu-Opatz IL, Ben-Shaul Y, Spehr M (2016) Interdependent Conductances Drive Infraslow Intrinsic Rhythmogenesis in a Subset of Accessory Olfactory Bulb Projection Neurons. J Neurosci 36:3127-44 [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: Olfactory bulb;
Cell Type(s): Olfactory bulb (accessory) mitral cell;
Channel(s): I Potassium; I Na,p; I Calcium; I Na,t; I K,Ca; I A; I K; I R;
Gap Junctions:
Simulation Environment: NEURON;
Model Concept(s): Sensory processing; Oscillations; Olfaction;
Implementer(s): O'Connor, Simon [simon.oconnor at];
Search NeuronDB for information about:  I Na,p; I Na,t; I A; I K; I K,Ca; I Calcium; I Potassium; I R;

   File generated by: neuroConstruct v1.7.1 

   This file holds the implementation in NEURON of the Cell Mechanism:
   Gran_CaPool_98 (Type: Ion concentration, Model: ChannelML based process)

   with parameters: 
   /channelml/@units = SI Units 
   /channelml/notes = A channel from Maex, R and De Schutter, E. Synchronization of Golgi and Granule Cell Firing in a       Detailed Network Model of the Cerebellar Granul ... 
   /channelml/ion/@name = ca 
   /channelml/ion/@charge = 2 
   /channelml/ion/@role = SignallingSubstance 
   /channelml/ion/notes = Signifies that the ion is involved in a process which alters its concentration 
   /channelml/ion_concentration/@name = Gran_CaPool_98 
   /channelml/ion_concentration/status/@value = stable 
   /channelml/ion_concentration/status/comment = This ChannelML file has been updated to reflect the preferred form of elements/attributes which will be required from v2.0. 	See info on Version 2 Req ... 
   /channelml/ion_concentration/status/contributor/name = Padraig Gleeson 
   /channelml/ion_concentration/notes = An expontially decaying pool of calcium 
   /channelml/ion_concentration/publication/fullTitle = Maex, R and De Schutter, E. 	Synchronization of Golgi and Granule Cell Firing in a Detailed Network Model of the 	cerebellar Granule Cell Layer. J Neu ... 
   /channelml/ion_concentration/publication/pubmedRef = 
   /channelml/ion_concentration/ion_species/@name = ca 
   /channelml/ion_concentration/decaying_pool_model/@resting_conc = 7.55e-5 
   /channelml/ion_concentration/decaying_pool_model/@decay_constant = 1e-2 
   /channelml/ion_concentration/decaying_pool_model/pool_volume_info/@shell_thickness = 8.4e-8 

// File from which this was generated: /home/Simon/NML2_Test/AOB_MC_neuroConstruct/cellMechanisms/Gran_CaPool_98/CaPool.xml

// XSL file with mapping to simulator: /home/Simon/NML2_Test/AOB_MC_neuroConstruct/cellMechanisms/Gran_CaPool_98/ChannelML_v1.8.1_NEURONmod.xsl


?  This is a NEURON mod file generated from a ChannelML file

?  Unit system of original ChannelML file: SI Units

    A channel from Maex, R and De Schutter, E. Synchronization of Golgi and Granule Cell Firing in a
      Detailed Network Model of the Cerebellar Granule Cell Layer


? Creating ion concentration

TITLE Channel: Gran_CaPool_98

    An expontially decaying pool of calcium

    (mV) = (millivolt)
    (mA) = (milliamp)
    (um) = (micrometer)
    (l) = (liter)
    (molar) = (1/liter)
    (mM) = (millimolar)

    SUFFIX Gran_CaPool_98
    RANGE cai
    RANGE rest_conc
    RANGE tau
    RANGE thickness, F

    RANGE total_current
    RANGE volume_pool


    ica (mA/cm2)
    diam (um)
    area (um)

    LOCAL pi, shell_inner_diam, cylinderLen, circumference, circumference_shell, volumeOuter, volumeInner, volumeSph, volumeCyl

    pi = 3.14159265

    shell_inner_diam = diam - (2*thickness)

    ?  Volume of the pool if it is a shell inside a sphere of diameter diam

    volumeSph = (diam*diam*diam) * pi / 6 - (shell_inner_diam*shell_inner_diam*shell_inner_diam)* pi / 6

    ? Volume of the pool if it is a cylinder

    circumference = diam * pi
    circumference_shell = shell_inner_diam * pi

    cylinderLen = area/circumference

    volumeOuter = (diam * diam/4) * pi * cylinderLen
    volumeInner = (shell_inner_diam * shell_inner_diam/4) * pi * cylinderLen
    volumeCyl = volumeOuter - volumeInner

    if ((area - (pi * diam * diam)) < 1e-3 && (area - (pi * diam * diam)) > -1e-3 ) {

        ? Assume the segment is a sphere

        volume_pool = volumeSph
    } else {

        ? assume segment is a cylinder

        volume_pool = volumeCyl

    cai = rest_conc



    rest_conc = 0.0000755 (mM)
    tau = 10 (ms)
    F = 96494 (C)
    thickness = 0.08399999999999999 (um)   


    cai (mM)



    SOLVE conc METHOD derivimplicit


    LOCAL thickness_cm, surf_area_cm2, volume_cm3 ? Note, normally dimensions are in um, but curr dens is in mA/cm2, etc
    thickness_cm = thickness *(1e-4)
    surf_area_cm2 = area * 1e-8
    volume_cm3 = volume_pool * 1e-12
    total_current = ica * surf_area_cm2

    cai' =  ((-1 * total_current)/(2 * F * volume_cm3)) - ((cai - rest_conc)/tau)


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