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Localization of sirtuins (SIRT1-7) in the aged mouse inner ear
Hiroshima Univ Hosp, Dept Otolaryngol, Hiroshima 7348551, Japan..
Univ Tokyo, Fac Med, Tokyo 1138654, Japan..
Hiroshima Univ Hosp, Dept Otolaryngol, Hiroshima 7348551, Japan..
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Otolaryngology and Head and Neck Surgery.
2016 (English)In: Acta Oto-Laryngologica, ISSN 0001-6489, E-ISSN 1651-2251, Vol. 136, no 2, 120-131 p.Article in journal (Refereed) PublishedText
Abstract [en]

Conclusion: The expression of sirtuin in vestibular end organs and cochlea responds differently to age-related changes. Down-regulation of SIRT1, 3, and 5 in the cochlea may weaken the protective activity regarding degeneration of the organ of Corti as well as of spiral ganglion cells, resulting in the development of age-related hearing loss. An increase in SIRT 1, 4, or 5 in vestibular tissue could indicate an increased need of detoxification of reactive oxygen species and an increased anti-ageing potential. Objective: To analyse the expression of sirtuins (SIRT1-7) in the normal young and old mouse inner ears. Methods: Young (8 weeks) and old (22 months) CBA/J mice were used in this study. Localization of SIRT1-7 in the inner ear, i.e. cochlea, vestibular end organs, and vestibular ganglion, was investigated using real-time PCR and immunohistochemistry. Results: In the vestibular end organs, the expression of SIRT1, 2, 4, 5 (both mRNA and protein), SIRT6, and 7 (only mRNA) was found to be increased, while a slightly decreased immunoreactivity was observed in SIRT3. In the cochlea, the expression of SIRT1, 3, and 5 (both mRNA and protein) was decreased in the old mice, whereas no noticeable difference was observed regarding SIRT2, 4, 6, or 7.

Place, publisher, year, edition, pages
2016. Vol. 136, no 2, 120-131 p.
Keyword [en]
Sirtuin, inner ear, mouse, ageing, presbycusis
National Category
URN: urn:nbn:se:uu:diva-275530DOI: 10.3109/00016489.2015.1093172ISI: 000367596500002PubMedID: 26472659OAI: oai:DiVA.org:uu-275530DiVA: diva2:900656
Available from: 2016-02-04 Created: 2016-02-04 Last updated: 2016-02-04Bibliographically approved

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Anniko, Matti
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