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  Presynaptic Na+ Channels: Locus, Development, and Recovery from Inactivation at a High-Fidelity Synapse

Leão, R. M., Kushmerick, C., Pinaud, R., Renden, R., Li, G.-L., Taschenberger, H., et al. (2005). Presynaptic Na+ Channels: Locus, Development, and Recovery from Inactivation at a High-Fidelity Synapse. The Journal of Neuroscience, 25(14), 3724-3738. doi:10.1523/JNEUROSCI.3983-04.2005.

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Genre: Zeitschriftenartikel
Andere : Presynaptic Na+ Channels: Locus, Development, and Recovery from Inactivation at a High-Fidelity Synapse

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 Urheber:
Leão, Ricardo M., Autor
Kushmerick, Christopher, Autor
Pinaud, Raphael, Autor
Renden, Robert, Autor
Li, Geng-Lin, Autor
Taschenberger, Holger1, Autor                 
Spirou, George, Autor
Levinson, S. Rock, Autor
von Gersdorff, Henrique, Autor
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1External Organizations, ou_persistent22              

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 Zusammenfassung: Na+ channel recovery from inactivation limits the maximal rate of neuronal firing. However, the properties of presynaptic Na+ channels are not well established because of the small size of most CNS boutons. Here we study the Na+ currents of the rat calyx of Held terminal and compare them with those of postsynaptic cells. We find that presynaptic Na+ currents recover from inactivation with a fast, single-exponential time constant (24°C, τ of 1.4-1.8 ms; 35°C, τ of 0.5 ms), and their inactivation rate accelerates twofold during development, which may contribute to the shortening of the action potential as the terminal matures. In contrast, recordings from postsynaptic cells in brainstem slices, and acutely dissociated, reveal that their Na+ currents recover from inactivation with a double-exponential time course (τfast of 1.2-1.6 ms; τslow of 80-125 ms; 24°C). Surprisingly, confocal immunofluorescence revealed that Na+ channels are mostly absent from the calyx terminal but are instead highly concentrated in an unusually long (≈20-40 μm) unmyelinated axonal heminode. Outside-out patch recordings confirmed this segregation. Expression of Nav1.6 α-subunit increased during development, whereas the Nav1.2α-subunit was not present. Serial EM reconstructions also revealed a long pre-calyx heminode, and biophysical modeling showed that exclusion of Na+ channels from the calyx terminal produces an action potential waveform with a shorter half-width. We propose that the high density and polarized locus of Na+ channels on a long heminode are critical design features that allow the mature calyx of Held terminal to fire reliably at frequencies near 1 kHz.

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Sprache(n): eng - English
 Datum: 2005
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1523/JNEUROSCI.3983-04.2005
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Titel: The Journal of Neuroscience
  Andere : The Journal of Neuroscience: the Official Journal of the Society for Neuroscience
  Kurztitel : J. Neurosci.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington, DC : Society of Neuroscience
Seiten: - Band / Heft: 25 (14) Artikelnummer: - Start- / Endseite: 3724 - 3738 Identifikator: ISSN: 0270-6474
CoNE: https://pure.mpg.de/cone/journals/resource/954925502187_1