Cited by 47Hearing, Cochlea, Tinnitus, GeneticsNeuroscience and Neuropharmacology ResearchVestibular and auditory disorders

GluA2-containing AMPA receptors distinguish ribbon-associated from Ribbonless afferent contacts on rat Cochlear hair cells

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Martinez-Monedero, Rodrigo, Liu, Chang, Weisz, Catherine, Vyas, Pankhuri, Fuchs, Paul Albert, Glowatzki, Elisabeth·2016·eNeuro

Abstract

Mechanosensory hair cells release glutamate at ribbon synapses to excite postsynaptic afferent neurons, via AMPA-type ionotropic glutamate receptors (AMPARs). However, type II afferent neurons contacting outer hair cells in the mammalian cochlea were thought to differ in this respect, failing to show GluA immunolabeling and with many "ribbonless" afferent contacts. Here it is shown that antibodies to the AMPAR subunit GluA2 labeled afferent contacts below inner and outer hair cells in the rat cochlea, and that synaptic currents in type II afferents had AMPAR-specific pharmacology. Only half the postsynaptic densities of type II afferents that labeled for PSD-95, Shank, or Homer were associated with GluA2 immunopuncta or presynaptic ribbons, the "empty slots" corresponding to ribbonless contacts described previously. These results extend the universality of AMPAergic transmission by hair cells, and support the existence of silent afferent contacts.

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Crossref · 10.1523/eneuro.0078-16.2016

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  • Type II cochlear afferents have small caliber, unmyelinated processes that extend hundreds of microns toward the cochlear base, contacting dozens of outer hair cells enroute.

    “Type II cochlear afferents have small caliber, unmyelinated processes that extend hundreds of microns toward the cochlear base, contacting dozens of outer hair cells enroute (27–29).”

    From Damage-evoked signals in cochlear neurons and supporting cells (2024) · cites this paper as [27]

    The Results section (“Type II fibers form a stereotyped pattern of OHC innervation”; page unavailable) reports processes extending toward the cochlear base for hundreds of micrometers and contacting an average of 23.7 outer hair cells. The Significance Statement says type II afferents differ from type I in caliber and myelination, but our copy does not specify there that the processes are small-caliber and unmyelinated. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Ribbons of the OHCs increase in number and size after acoustic trauma, potentially providing stronger synaptic excitation to rouse previously silent type II contacts.

    “Presynaptically, ribbons of the OHCs increase in number and size after acoustic trauma (53), potentially providing stronger synaptic excitation to rouse previously silent type II contacts (27).”

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Authors
Martinez-Monedero, R., Liu, C., Weisz, C., Vyas, P., Fuchs, P. A., & Glowatzki, E.
Affiliations
Johns Hopkins University (US)
Corresponding author
  • Fuchs, Paul Albert
  • Glowatzki, Elisabeth
Venue
eNeuro
Published
2016-03
Volume
3
Issue
2
Pages
ENEURO.0078-16.2016
ISSN
2373-2822 (ISSN-L)
OpenAlex
W2346281242
Cited by
47
References
108
Citations by year
2026: 3 · 2025: 5 · 2024: 5 · 2023: 3 · 2022: 4 · 2021: 9 · 2020: 5 · 2019: 6 · 2018: 4 · 2017: 1 · 2016: 2
FWCI
3.22
Type
journal article
Language
en
Open access
Locations
  • eNeuro (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institute for Deafness and Other Communication Disorders (R01DC006476, R01DC011741, T32DC000023, F31DC010948, P30DC005211)
  • NINDS (NS050274)
  • the John Mitchell Junior Trust
Topics
  • Life Sciences › Neuroscience › Sensory Systems › Hearing, Cochlea, Tinnitus, Genetics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Neurology › Vestibular and auditory disorders
Keywords
GluA2, AMPA receptors, ribbon synapses, cochlear hair cells, glutamate release, synaptic transmission, postsynaptic density, silent synapses, cochlear synapses
MeSH terms
Homer Scaffolding Proteins, Disks Large Homolog 4 Protein, Animals, Calcium, Cochlea, Enzyme Inhibitors, Eye Proteins, Membrane Proteins, Nerve Net, Nerve Tissue Proteins, Quinazolines, Synapses, Triazoles, Rats, Sprague-Dawley, Presynaptic Terminals, Hair Cells, Auditory, Outer, Receptors, AMPA, Excitatory Amino Acid Agents, Glutamic Acid, Excitatory Postsynaptic Potentials, Intracellular Signaling Peptides and Proteins, Rats, Biophysical Phenomena, In Vitro Techniques

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