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Ultrastructural Characterization of Stem Cell-Derived Replacement Vestibular Hair Cells Within Ototoxin-Damaged Rat Utricle Explants
Umeå University, Faculty of Medicine, Department of Clinical Sciences, Otorhinolaryngology.ORCID iD: 0000-0002-9031-565X
Umeå University, Faculty of Medicine, Department of Epidemiology and Global Health.
Umeå University, Faculty of Medicine, Department of Clinical Sciences, Otorhinolaryngology.
2020 (English)In: The Anatomical Record: advances in integrative anatomy and evolutionary biology, ISSN 1932-8486, Vol. 303, no 3, p. 506-515Article in journal (Refereed) Published
Abstract [en]

The auditory apparatus of the inner ear does not show turnover of sensory hair cells (HCs) in adult mammals; in contrast, there are many observations supporting low-level turnover of vestibular HCs within the balance organs of mammalian inner ears. This low-level renewal of vestibular HCs exists during normal conditions and it is further enhanced after trauma-induced loss of these HCs. The main process for renewal of HCs within mammalian vestibular epithelia is a conversion/transdifferentiation of existing supporting cells (SCs) into replacement HCs.In earlier studies using long-term organ cultures of postnatal rat macula utriculi, HC loss induced by gentamicin resulted in an initial substantial decline in HC density followed by a significant increase in the proportion of HCs to SCs indicating the production of replacement HCs. In the present study, using the same model of ototoxic damage to study renewal of vestibular HCs, we focus on the ultrastructural characteristics of SCs undergoing transdifferentiation into new HCs. Our objective was to search for morphological signs of SC plasticity during this process. In the utricular epithelia, we observed immature HCs, which appear to be SCs transdifferentiating into HCs. These bridge SCs have unique morphological features characterized by formation of foot processes, basal accumulation of mitochondria, and an increased amount of connections with nearby SCs. No gap junctions were observed on these transitional cells. The tight junction seals were morphologically intact in both control and gentamicin-exposed explants. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2020. Vol. 303, no 3, p. 506-515
Keywords [en]
vestibular hair cell, support cell, plasticity, morphology, regeneration, transdifferentiation, utricle, rat
National Category
Otorhinolaryngology
Identifiers
URN: urn:nbn:se:umu:diva-168840DOI: 10.1002/ar.24148ISI: 000513737100013PubMedID: 31090209Scopus ID: 2-s2.0-85066495661OAI: oai:DiVA.org:umu-168840DiVA, id: diva2:1415546
Available from: 2020-03-19 Created: 2020-03-19 Last updated: 2023-03-24Bibliographically approved

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Werner, MimmiStenlund, HansBerggren, Diana

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