Acoustic Trauma Modulates Cochlear Blood Flow and Vasoactive Factors in a Rodent Model of Noise-Induced Hearing Loss

International Journal of Molecular Sciences

TaeHwan Kim¹  Seong-Hun Jeong²  MinJung Park³  Ah-Ra Lyu³  Sun-Ae Shin³  Yong-Ho Park³ 

[1] Biomedical Convergence Research Center, Chungnam National University Hospital, Daejeon 35015, Korea;Department of Medical Science, College of Medicine, Chungnam National University, Daejeon 35015, Korea;Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Chungnam National University, Daejeon 35015, Korea;

关键词: hearing loss;    noise-induced;    regional blood flow;    stria vascularis;   

DOI  :  10.3390/ijms20215316

来源: DOAJ

【 摘 要 】

Noise exposure affects the organ of Corti and the lateral wall of the cochlea, including the stria vascularis and spiral ligament. Although the inner ear vasculature and spiral ligament fibrocytes in the lateral wall consist of a significant proportion of cells in the cochlea, relatively little is known regarding their functional significance. In this study, 6-week-old male C57BL/6 mice were exposed to noise trauma to induce transient hearing threshold shift (TTS) or permanent hearing threshold shift (PTS). Compared to mice with TTS, mice with PTS exhibited lower cochlear blood flow and lower vessel diameter in the stria vascularis, accompanied by reduced expression levels of genes involved in vasodilation and increased expression levels of genes related to vasoconstriction. Ultrastructural analyses by transmission electron microscopy revealed that the stria vascularis and spiral ligament fibrocytes were more damaged by PTS than by TTS. Moreover, mice with PTS expressed significantly higher levels of proinflammatory cytokines in the cochlea (e.g., IL-1β, IL-6, and TNF-α). Overall, our findings suggest that cochlear microcirculation and lateral wall pathologies are differentially modulated by the severity of acoustic trauma and are associated with changes in vasoactive factors and inflammatory responses in the cochlea.

【 授权许可】

Unknown