A model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikes
The dopamine-dependent plasticity of the cortico-striatal synapses is considered as the cellular mechanism crucial for reinforcement learning. The dopaminergic inputs and the calcium responses affect the synaptic plasticity by way of the signaling cascades within the synaptic spines. The calcium con...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Frontiers Media S.A.
2013-09-01
|
Series: | Frontiers in Computational Neuroscience |
Subjects: | |
Online Access: | http://journal.frontiersin.org/article/10.3389/fncom.2013.00119/full |
id |
doaj-ec23885286834b54bd35d4a26c6d1fff |
---|---|
record_format |
Article |
spelling |
doaj-ec23885286834b54bd35d4a26c6d1fff2020-11-25T00:51:32ZengFrontiers Media S.A.Frontiers in Computational Neuroscience1662-51882013-09-01710.3389/fncom.2013.0011956905A model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikesTakashi Nakano0Junichiro Yoshimoto1Junichiro Yoshimoto2Kenji Doya3Kenji Doya4Neurobiology Research Unit, Okinawa Institute of Science and Technology Graduate UniversityOkinawa, JapanNeural Computation Unit, Okinawa Institute of Science and Technology Graduate UniversityOkinawa, JapanGraduate School of Information Science, Nara Institute of Science and TechnologyNara, JapanNeural Computation Unit, Okinawa Institute of Science and Technology Graduate UniversityOkinawa, JapanGraduate School of Information Science, Nara Institute of Science and TechnologyNara, JapanThe dopamine-dependent plasticity of the cortico-striatal synapses is considered as the cellular mechanism crucial for reinforcement learning. The dopaminergic inputs and the calcium responses affect the synaptic plasticity by way of the signaling cascades within the synaptic spines. The calcium concentration within synaptic spines, however, is dependent on multiple factors including the calcium influx through ionotropic glutamate receptors, the intracellular calcium release by activation of metabotropic glutamate receptors, and the opening of calcium channels by EPSPs and back-propagating action potentials. Furthermore, dopamine is known to modulate the efficacies of NMDA receptors, some of the calcium channels, and sodium and potassium channels that affect the back propagation of action potentials. Here we construct an electric compartment model of the striatal medium spiny neuron with a realistic morphology and predict the calcium responses in the synaptic spines with variable timings of the glutamatergic and dopaminergic inputs and the postsynaptic action potentials. The model was validated by reproducing the responses to current inputs and could predict the electric and calcium responses to glutamatergic inputs and back-propagating action potential in the proximal and distal synaptic spines during up- and down-states. We investigated the calcium responses by systematically varying the timings of the glutamatergic and dopaminergic inputs relative to the action potential and found that the calcium response and the subsequent synaptic potentiation is maximal when the dopamine input precedes glutamate input and action potential. The prediction is not consistent with the hypothesis that the dopamine input provides the reward prediction error for reinforcement learning. The finding suggests that there is an unknown learning mechanisms at the network level or an unknown cellular mechanism for calcium dynamics and signaling cascades.http://journal.frontiersin.org/article/10.3389/fncom.2013.00119/fullstriatal medium spiny neuroncalcium signalingspike-timing-dependent plasticitydopamine modulationmulti-compartment model |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Takashi Nakano Junichiro Yoshimoto Junichiro Yoshimoto Kenji Doya Kenji Doya |
spellingShingle |
Takashi Nakano Junichiro Yoshimoto Junichiro Yoshimoto Kenji Doya Kenji Doya A model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikes Frontiers in Computational Neuroscience striatal medium spiny neuron calcium signaling spike-timing-dependent plasticity dopamine modulation multi-compartment model |
author_facet |
Takashi Nakano Junichiro Yoshimoto Junichiro Yoshimoto Kenji Doya Kenji Doya |
author_sort |
Takashi Nakano |
title |
A model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikes |
title_short |
A model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikes |
title_full |
A model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikes |
title_fullStr |
A model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikes |
title_full_unstemmed |
A model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikes |
title_sort |
model-based prediction of the calcium responses in the striatal synaptic spines depending on the timing of cortical and dopaminergic inputs and post-synaptic spikes |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Computational Neuroscience |
issn |
1662-5188 |
publishDate |
2013-09-01 |
description |
The dopamine-dependent plasticity of the cortico-striatal synapses is considered as the cellular mechanism crucial for reinforcement learning. The dopaminergic inputs and the calcium responses affect the synaptic plasticity by way of the signaling cascades within the synaptic spines. The calcium concentration within synaptic spines, however, is dependent on multiple factors including the calcium influx through ionotropic glutamate receptors, the intracellular calcium release by activation of metabotropic glutamate receptors, and the opening of calcium channels by EPSPs and back-propagating action potentials. Furthermore, dopamine is known to modulate the efficacies of NMDA receptors, some of the calcium channels, and sodium and potassium channels that affect the back propagation of action potentials. Here we construct an electric compartment model of the striatal medium spiny neuron with a realistic morphology and predict the calcium responses in the synaptic spines with variable timings of the glutamatergic and dopaminergic inputs and the postsynaptic action potentials. The model was validated by reproducing the responses to current inputs and could predict the electric and calcium responses to glutamatergic inputs and back-propagating action potential in the proximal and distal synaptic spines during up- and down-states. We investigated the calcium responses by systematically varying the timings of the glutamatergic and dopaminergic inputs relative to the action potential and found that the calcium response and the subsequent synaptic potentiation is maximal when the dopamine input precedes glutamate input and action potential. The prediction is not consistent with the hypothesis that the dopamine input provides the reward prediction error for reinforcement learning. The finding suggests that there is an unknown learning mechanisms at the network level or an unknown cellular mechanism for calcium dynamics and signaling cascades. |
topic |
striatal medium spiny neuron calcium signaling spike-timing-dependent plasticity dopamine modulation multi-compartment model |
url |
http://journal.frontiersin.org/article/10.3389/fncom.2013.00119/full |
work_keys_str_mv |
AT takashinakano amodelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT junichiroyoshimoto amodelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT junichiroyoshimoto amodelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT kenjidoya amodelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT kenjidoya amodelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT takashinakano modelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT junichiroyoshimoto modelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT junichiroyoshimoto modelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT kenjidoya modelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes AT kenjidoya modelbasedpredictionofthecalciumresponsesinthestriatalsynapticspinesdependingonthetimingofcorticalanddopaminergicinputsandpostsynapticspikes |
_version_ |
1725245344767279104 |