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Updated: Jun 5, 2025

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Cochlear Surface Preparation in the Adult Mouse
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噪音会诱导Ca2+信号波和Chop/S-Xbp1在听力中的表达
Yesai Park1, Jiang Li2,3, Noura Ismail Mohamad1
1Department of Otolaryngology-Head and Neck Surgery.
JCI insight
|December 11, 2024
概括
暴露于大声噪音会引发内质网膜应激,并破坏内耳中的平衡,导致听力损失. 针对这些途径可能为噪音引起的听力损失提供新的治疗方法.
科学领域:
- 耳鼻神经科学 耳鼻神经科学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 获得性听力损失通常是由暴露于大噪声引起的.
- 亚细胞平衡中断和内网膜应激通路,包括未折叠蛋白质反应 (UPR),都与噪音引起的听力损失有关.
- 在成熟,暴露于噪音的小鼠中测量动态一直是具有挑战性的,这限制了对这些关联的研究.
研究的目的:
- 为了研究噪声暴露,平衡和成熟小鼠耳细胞中未折叠蛋白质反应 (UPR) 激活之间的关联.
- 利用一种新的遗传编码指标小鼠模型来实时成像动态.
- 分析在不同音压水平 (SPL) 的噪声暴露后的UPR基因表达.
主要方法:
- 使用基因编码指标 (GCaMP6f) 的小鼠模型,在毛细胞 (Myo15Cre) 或支持细胞 (Sox2Cre) 中表达指标.
- 活成像和UPR基因表达分析在8周大的小鼠身上进行,这些小鼠暴露在98dB SPL (耳突触) 或106dB SPL (永久性听力损失) 噪音中.
- 在暴露于噪音后立即评估动态和UPR激活模式.
主要成果:
- 在暴露于噪音后立即观察到UPR激活,其模式取决于噪音水平.
- 只有在暴露于106dB SPL后,UPR的前性途径才得到上调.
- 自发的过渡体和细胞间波,通常在成熟的带中处于静止状态,被噪声暴露重新激活,SPL106dB导致更持久和扩展的活动.
结论:
- 暴露于噪声会诱导UPR激活与耳毛和支持细胞中改变的平衡之间的剂量依赖关系.
- 这些发现强调了信号和压力通路在噪音引起的听力损失中的关键作用.
- 针对这些细胞机制是预防或治疗噪音引起的听力损失的潜在治疗策略.
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