Synaptic transfer from outer hair cells to type II afferent fibers in the rat cochlea
Open accessAbstract
Type II cochlear afferents receive glutamatergic synaptic excitation from outer hair cells (OHCs) in the rat cochlea. However, it remains uncertain whether this connection is capable of providing auditory information to the brain. The functional efficacy of this connection depends in part on the number of presynaptic OHCs, their probability of transmitter release, and the effective electrical distance for spatial summation in the type II fiber. The present work addresses these questions using whole-cell recordings from the spiral process of type II afferents that run below OHCs in the apical turn of young (5-9 d postnatal) rat cochlea. A "high potassium puffer" was used to elicit calcium action potentials from individual OHCs and thereby show that the average probability of transmitter release was 0.26 (range 0.02-0.73). Electron microscopy showed relatively few vesicles tethered to ribbons in equivalent OHCs. A "receptive field" map for individual type II fibers was constructed by successively puffing onto OHCs along the cochlear spiral, up to 180 μm from the recording pipette. These revealed a conservative estimate of 7 presynaptic OHCs per type II fiber (range 1-11). EPSCs evoked from presynaptic OHCs separated by >100 μm did not differ in amplitude or waveform, implying that the type II fiber's length constant exceeded the length of the synaptic input zone. Together these data suggest that type II fibers could communicate centrally by maximal activation of their entire pool of presynaptic OHCs.
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Intracellular tight-seal recordings from type II afferents in cochlear explants revealed that glutamatergic transmission from one OHC was orders of magnitude weaker than that provided by each IHC to type I afferent ribbon synapse.
“Intracellular tight-seal recordings from type II afferents in cochlear explants revealed that glutamatergic transmission from one OHC was orders of magnitude weaker than that provided by each IHC to type I afferent ribbon synapse (4, 33, 34).”
From Damage-evoked signals in cochlear neurons and supporting cells (2024) · cites this paper as [34]
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“Key words: acoustic trauma; ATP; auditory neuroscience; glia; nociception; peripheral nervous system Significance Statement The function of type II cochlear afferents is currently unknown.”
BackgroundInfluentialSelf-citationDamage-evoked signals in cochlear neurons and supporting cells
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Self-citation
- Authors
- Weisz, C. J. C., Lehar, M., Hiel, H., Glowatzki, E., & Fuchs, P. A.
- Affiliations
- Johns Hopkins University (US)
- Corresponding author
- Fuchs, P. A.
- Venue
- Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2012-07-11
- Volume
- 32
- Issue
- 28
- Pages
- 9528-9536
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC3433252
- OpenAlex
- W1985132883
- Cited by
- 92
- References
- 49
- Citations by year
- 2026: 6 · 2025: 6 · 2024: 3 · 2023: 4 · 2022: 5 · 2021: 9 · 2020: 9 · 2019: 8 · 2018: 9 · 2017: 2 · 2016: 7 · 2015: 10 · 2014: 7 · 2013: 5 · 2012: 2
- FWCI
- 4.27
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Neuroscience (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Johns Hopkins University
- National Institute on Deafness and Other Communication Disorders (005211, R01DC011741, F31DC010948, R01DC006476, P30DC005211, T32DC000023)
- 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
- outer hair cells, glutamatergic synapses, ribbon synapses, spatial summation, receptive field mapping, calcium action potentials, length constant
- MeSH terms
- Afferent Pathways, Animals, Animals, Newborn, Biophysics, Brain Mapping, Cochlea, Female, Male, Physical Stimulation, Synapses, Rats, Sprague-Dawley, Hair Cells, Auditory, Outer, Patch-Clamp Techniques, Excitatory Postsynaptic Potentials, Imaging, Three-Dimensional, Microscopy, Electron, Transmission, Rats, In Vitro Techniques
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