Roshchin, Matevey, Matlashov, Mikhail E, Ierusalimsky, Victor N, Balaban, Pavel M, Belousov, Vsevolod V, Kemenes, György, Staras, Kevin and Nikitin, Evgeny S (2018) A BK-channel-mediated feedback pathway links single-synapse activity with action potential sharpening in repetitive firing. Science Advances, 4 (7). pp. 1-8. ISSN 2375-2548
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Abstract
Action potential shape is a major determinant of synaptic transmission and mechanisms of spike-tuning are therefore of key functional significance. Here we demonstrate that synaptic activity itself modulates future spikes in the same neuron via a rapid feedback pathway. Using Ca2+ imaging and targeted uncaging approaches in layer 5 neocortical pyramidal neurons we show that the single spike-evoked Ca2+ rise occurring in one proximal bouton or first node of Ranvier drives a significant sharpening of subsequent action potentials recorded at the soma. This form of intrinsic modulation, mediated by the activation of large conductance Ca2+/voltage-dependent K+ channels (BK channels), acts to maintain high-frequency firing and limit runaway spike broadening during repetitive firing, preventing an otherwise significant escalation of synaptic transmission. Our findings identify a novel short-term presynaptic plasticity mechanism that utilizes the activity-history of a bouton or adjacent axonal site to dynamically tune ongoing signalling properties.
Item Type: | Article |
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Keywords: | Synapse; Neuron; Action Potential; Plasticity; Activity Tuning |
Schools and Departments: | School of Life Sciences > Neuroscience |
Research Centres and Groups: | Sussex Neuroscience |
Subjects: | Q Science > QP Physiology Q Science > QP Physiology > QP0351 Neurophysiology and neuropsychology Q Science > QP Physiology > QP0351 Neurophysiology and neuropsychology > QP0361 Nervous system Q Science > QP Physiology > QP0351 Neurophysiology and neuropsychology > QP0361 Nervous system > QP0364 Synapses |
Depositing User: | Kevin Staras |
Date Deposited: | 08 Jun 2018 11:03 |
Last Modified: | 11 Jul 2018 09:40 |
URI: | http://srodev.sussex.ac.uk/id/eprint/76402 |
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📧 Request an updateProject Name | Sussex Project Number | Funder | Funder Ref |
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Ultrastructure-function properties of recycling vesicle pools in native central synapses | G1150 | BBSRC-BIOTECHNOLOGY & BIOLOGICAL SCIENCES RESEARCH COUNCIL | BB/K019015/1 |