Bisphosphonate therapy ameliorates hearing loss in mice lacking osteoprotegerin

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
Sho KanzakiKoichi Matsuo

Abstract

Three auditory ossicles including the malleus, incus, and stapes conduct sound in the middle ear from the tympanic membrane to the inner ear. Auditory ossicles are massively resorbed by osteoclasts in Opg(-/-) mice, which lack osteoprotegerin (OPG), a soluble decoy receptor for the osteoclastogenic cytokine RANKL. Opg(-/-) mice exhibit progressive hearing loss and are a model for juvenile Paget's disease. However, effects of antiresorptive treatment on auditory ossicles and on hearing function in Opg(-/-) mice are unknown. We intraperitoneally injected Opg(-/-) mice with bisphosphonate risedronate 5 d/wk for 9 wk. Morphology of auditory ossicles was examined microscopically, radiographically, and histologically. Hearing function was monitored by measuring the auditory brain stem response (ABR). Control Opg(-/-) mice exhibited thinning of all three ossicles and tibia. In contrast, risedronate treatment significantly inhibited bone loss in auditory ossicles as well as in long bones of Opg(-/-) mice. Bony fusion of the junction between the stapes and the otic capsule was reduced after treatment. Moreover, ABR measurement showed that hearing in Opg(-/-) mice was significantly improved by risedronate treatment. These data suggest th...Continue Reading

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Citations

Jan 23, 2010·Clinical Journal of the American Society of Nephrology : CJASN·Junichiro James KazamaAkihide Tokumoto
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Sep 16, 2021·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Maximilian M DelsmannTim Rolvien

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