Short-term synaptic plasticity, simulation of nerve terminal dynamics, and the effects of protein kinase C activation in rat hippocampus.
Phorbol esters are hypothesised to produce a protein kinase C (PKC)-dependent increase in the probability of transmitter release via two mechanisms: facilitation of vesicle fusion or increases in synaptic vesicle number and replenishment. We used a combination of electrophysiology and computer simul...
| Main Authors: | , , |
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| Formato: | Journal article |
| Idioma: | English |
| Publicado em: |
2002
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| _version_ | 1826301384243281920 |
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| author | Brager, D Capogna, M Thompson, S |
| author_facet | Brager, D Capogna, M Thompson, S |
| author_sort | Brager, D |
| collection | OXFORD |
| description | Phorbol esters are hypothesised to produce a protein kinase C (PKC)-dependent increase in the probability of transmitter release via two mechanisms: facilitation of vesicle fusion or increases in synaptic vesicle number and replenishment. We used a combination of electrophysiology and computer simulation to distinguish these possibilities. We constructed a stochastic model of the presynaptic contacts between a pair of hippocampal pyramidal cells that used biologically realistic processes and was constrained by electrophysiological data. The model reproduced faithfully several forms of short-term synaptic plasticity, including short-term synaptic depression (STD), and allowed us to manipulate several experimentally inaccessible processes. Simulation of an increase in the size of the readily releasable vesicle pool and the time of vesicle replenishment decreased STD, whereas simulation of a facilitation of vesicle fusion downstream of Ca(2+) influx enhanced STD. Because activation of protein kinase C with phorbol ester enhanced STD of EPSCs in rat hippocampal slice cultures, we conclude that an increase in the sensitivity of the release process for Ca(2+) underlies the potentiation of neurotransmitter release by PKC. |
| first_indexed | 2024-03-07T05:31:37Z |
| format | Journal article |
| id | oxford-uuid:e278abd3-164c-4b76-a7c8-d6c51cbb090a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:31:37Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:e278abd3-164c-4b76-a7c8-d6c51cbb090a2022-03-27T10:01:25ZShort-term synaptic plasticity, simulation of nerve terminal dynamics, and the effects of protein kinase C activation in rat hippocampus.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e278abd3-164c-4b76-a7c8-d6c51cbb090aEnglishSymplectic Elements at Oxford2002Brager, DCapogna, MThompson, SPhorbol esters are hypothesised to produce a protein kinase C (PKC)-dependent increase in the probability of transmitter release via two mechanisms: facilitation of vesicle fusion or increases in synaptic vesicle number and replenishment. We used a combination of electrophysiology and computer simulation to distinguish these possibilities. We constructed a stochastic model of the presynaptic contacts between a pair of hippocampal pyramidal cells that used biologically realistic processes and was constrained by electrophysiological data. The model reproduced faithfully several forms of short-term synaptic plasticity, including short-term synaptic depression (STD), and allowed us to manipulate several experimentally inaccessible processes. Simulation of an increase in the size of the readily releasable vesicle pool and the time of vesicle replenishment decreased STD, whereas simulation of a facilitation of vesicle fusion downstream of Ca(2+) influx enhanced STD. Because activation of protein kinase C with phorbol ester enhanced STD of EPSCs in rat hippocampal slice cultures, we conclude that an increase in the sensitivity of the release process for Ca(2+) underlies the potentiation of neurotransmitter release by PKC. |
| spellingShingle | Brager, D Capogna, M Thompson, S Short-term synaptic plasticity, simulation of nerve terminal dynamics, and the effects of protein kinase C activation in rat hippocampus. |
| title | Short-term synaptic plasticity, simulation of nerve terminal dynamics, and the effects of protein kinase C activation in rat hippocampus. |
| title_full | Short-term synaptic plasticity, simulation of nerve terminal dynamics, and the effects of protein kinase C activation in rat hippocampus. |
| title_fullStr | Short-term synaptic plasticity, simulation of nerve terminal dynamics, and the effects of protein kinase C activation in rat hippocampus. |
| title_full_unstemmed | Short-term synaptic plasticity, simulation of nerve terminal dynamics, and the effects of protein kinase C activation in rat hippocampus. |
| title_short | Short-term synaptic plasticity, simulation of nerve terminal dynamics, and the effects of protein kinase C activation in rat hippocampus. |
| title_sort | short term synaptic plasticity simulation of nerve terminal dynamics and the effects of protein kinase c activation in rat hippocampus |
| work_keys_str_mv | AT bragerd shorttermsynapticplasticitysimulationofnerveterminaldynamicsandtheeffectsofproteinkinasecactivationinrathippocampus AT capognam shorttermsynapticplasticitysimulationofnerveterminaldynamicsandtheeffectsofproteinkinasecactivationinrathippocampus AT thompsons shorttermsynapticplasticitysimulationofnerveterminaldynamicsandtheeffectsofproteinkinasecactivationinrathippocampus |