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2015 ; 327
(ä): 78-88
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Cochlear neuropathy in human presbycusis: Confocal analysis of hidden hearing
loss in post-mortem tissue
#MMPMID26002688
Viana LM
; O'Malley JT
; Burgess BJ
; Jones DD
; Oliveira CA
; Santos F
; Merchant SN
; Liberman LD
; Liberman MC
Hear Res
2015[Sep]; 327
(ä): 78-88
PMID26002688
show ga
Recent animal work has suggested that cochlear synapses are more vulnerable than
hair cells in both noise-induced and age-related hearing loss. This synaptopathy
is invisible in conventional histopathological analysis, because cochlear nerve
cell bodies in the spiral ganglion survive for years, and synaptic analysis
requires special immunostaining or serial-section electron microscopy. Here, we
show that the same quadruple-immunostaining protocols that allow synaptic counts,
hair cell counts, neuronal counts and differentiation of afferent and efferent
fibers in mouse can be applied to human temporal bones, when harvested within 9 h
post-mortem and prepared as dissected whole mounts of the sensory epithelium and
osseous spiral lamina. Quantitative analysis of five "normal" ears, aged
54-89 yrs, without any history of otologic disease, suggests that cochlear
synaptopathy and the degeneration of cochlear nerve peripheral axons, despite a
near-normal hair cell population, may be an important component of human
presbycusis. Although primary cochlear nerve degeneration is not expected to
affect audiometric thresholds, it may be key to problems with hearing in noise
that are characteristic of declining hearing abilities in the aging ear.