X Wang, H Zheng, B Yang, M Zu, Z Wang, J Zhang, F Zheng, M Yang, M C F Tong, L Zhao, W Bai
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Estrogen as a guardian of auditory health: Tsp1-CD47 axis regulation and noise-induced hearing loss.
Objectives: This study aimed to analyze the role of estrogen in noise-induced hearing loss (NIHL) and uncover underlying mechanisms.
Methods: An ovariectomized Sprague-Dawley rat model (OVX) was constructed to investigate the hearing threshold and auditory latency before and after noise exposure using the auditory brainstem response (ABR) test. The morphological changes were assessed using immunofluorescence, scanning electron microscopy and transmission electron microscopy. Proteomics and bioinformatics were used to analyze the mechanism. The findings were further verified through western blot and Luminex liquid suspension chip technology.
Results: After noise exposure, OVX rats exhibited substantially elevated hearing thresholds. A conspicuous delay in ABR wave I latency was observed, alongside increased loss of outer hair cells, severe collapse of stereocilia and pronounced deformation of the epidermal plate. Accordingly, OVX rats with estrogen supplementation exhibited tolerance to NIHL. Additionally, a remarkable upregulation of the thrombospondin 1 (Tsp1)-CD47 axis in OVX rats was discovered and verified.
Conclusions: OVX rats were more susceptible to NIHL, and the protective effect of estrogen was achieved through regulation of the Tsp1-CD47 axis. This study presents a novel mechanism through which estrogen regulates NIHL and offers a potential intervention strategy for the clinical treatment of NIHL.
期刊介绍：
Climacteric is the official journal of the International Menopause Society (IMS). As an international peer-reviewed journal it publishes original research and reviews of all aspects of aging in women.
Climacteric was founded by the IMS in 1998 and today has become a leading journal in the publication of peer-reviewed papers on the menopause, climacteric and mid-life health. Topics covered include endocrine changes, symptoms attributed to the menopause and their treatment, hormone replacement and alternative therapies, lifestyles, and the counselling and education of peri- and postmenopausal women. Climacteric, published bimonthly, also features regular invited reviews, editorials and commentaries on recent developments.
The editorial review board of Climacteric includes leading scientific and clinical experts in the field of midlife medicine and research and is headed by its Editor-in-Chief, Professor Rod Baber of Australia. He and his team of Associate Editors act independently to set a clear editorial policy, co-ordinate peer review, and ensure a rapid response to submitted papers.
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