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Ultrastructural defects in stereocilia and tectorial membrane in aging mouse and human cochleae

Bullen, A; Forge, A; Wright, A; Richardson, GP; Goodyear, RJ; Taylor, R; (2020) Ultrastructural defects in stereocilia and tectorial membrane in aging mouse and human cochleae. Journal of Neuroscience Research , 98 (9) pp. 1745-1763. 10.1002/jnr.24556. Green open access

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Abstract

The aging cochlea is subjected to a number of pathological changes to play a role in the onset of age-related hearing loss (ARHL). Although ARHL has often been thought of as the result of the loss of hair cells, it is in fact a disorder with a complex etiology, arising from the changes to both the organ of Corti and its supporting structures. In this study, we examine two aging pathologies that have not been studied in detail despite their apparent prevalence; the fusion, elongation, and engulfment of cochlear inner hair cell stereocilia, and the changes that occur to the tectorial membrane (TM), a structure overlying the organ of Corti that modulates its physical properties in response to sound. Our work demonstrates that similar pathological changes occur in these two structures in the aging cochleae of both mice and humans, examines the ultrastructural changes that underlie stereocilial fusion, and identifies the lost TM components that lead to changes in membrane structure. We place these changes into the context of the wider pathology of the aging cochlea, and identify how they may be important in particular for understanding the more subtle hearing pathologies that precede auditory threshold loss in ARHL.

Type: Article
Title: Ultrastructural defects in stereocilia and tectorial membrane in aging mouse and human cochleae
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/jnr.24556
Publisher version: https://doi.org/10.1002/jnr.24556
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: RRID: SCR _ 002865, age-related hearing loss, cochlea, hair cell, hearing, tectorin
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > The Ear Institute
URI: https://discovery.ucl.ac.uk/id/eprint/10086605
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