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Appears in Collections:Computing Science and Mathematics Journal Articles
Peer Review Status: Refereed
Title: Kv3.3 subunits control presynaptic action potential waveform and neurotransmitter release at a central excitatory synapse
Author(s): Richardson, Amy
Ciampani, Victoria
Stancu, Mihai
Bondarenko, Kseniia
Newton, Sherylanne
Steinert, Joern R
Pilati, Nadia
Graham, Bruce P
Kopp-Scheinpflug, Conny
Forsythe, Ian D
Keywords: General Immunology and Microbiology
General Biochemistry, Genetics and Molecular Biology
General Medicine
General Neuroscience
Issue Date: May-2022
Date Deposited: 24-May-2022
Citation: Richardson A, Ciampani V, Stancu M, Bondarenko K, Newton S, Steinert JR, Pilati N, Graham BP, Kopp-Scheinpflug C & Forsythe ID (2022) Kv3.3 subunits control presynaptic action potential waveform and neurotransmitter release at a central excitatory synapse. eLife, 11 (1), Art. No.: e75219.
Abstract: Kv3 potassium currents mediate rapid repolarisation of action potentials (APs), supporting fast spikes and high repetition rates. Of the four Kv3 gene family members, Kv3.1 and Kv3.3 are highly expressed in the auditory brainstem and we exploited this to test for subunit-specific roles at the calyx of Held presynaptic terminal in the mouse. Deletion of Kv3.3 (but not Kv3.1) reduced presynaptic Kv3 channel immunolabelling, increased presynaptic AP duration and facilitated excitatory transmitter release; which in turn enhanced short-term depression during high-frequency transmission. The response to sound was delayed in the Kv3.3KO, with higher spontaneous and lower evoked firing, thereby reducing signal-to-noise ratio. Computational modelling showed that the enhanced EPSC and short-term depression in the Kv3.3KO reflected increased vesicle release probability and accelerated activity-dependent vesicle replenishment. We conclude that Kv3.3 mediates fast repolarisation for short precise APs, conserving transmission during sustained high-frequency activity at this glutamatergic excitatory synapse.
DOI Link: 10.7554/elife.75219
Rights: © 2022, Richardson et al. This article is distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use and redistribution provided that the original author and source are credited.
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