渐进的毛细胞切除揭示了成熟小鼠静脉系统中的功能冗余
bioRxiv : the preprint server for biology
|December 12, 2025
概括
内耳毛细胞损失会影响平衡,但前庭系统表现出令人惊的弹性. 即使有显著的毛细胞损伤,由于固有的冗余性,关键平衡反射仍然具有功能.
科学领域:
- 神经科学是一个神经科学.
- 耳鼻喉科 耳鼻喉科 耳鼻喉科
- 垂体系统研究研究 垂体系统研究
背景情况:
- 内耳毛细胞是听力和平衡的关键机械受体.
- 垂体毛细胞损伤可能导致平衡障碍,但与功能障碍的确切相关性尚未完全理解.
研究的目的:
- 在成年小鼠中调查前体毛细胞损失和前体功能障碍之间的关系.
- 为了确定 vestibular 系统的功能冗余,以应对毛细胞切除.
主要方法:
- 在Pou4f3 DTR/+小鼠中,用角膜炎毒素 (DT) 切除毛细胞.
- 评估了剂量依赖于毛细胞在斑点和腹膜的存活率的影响.
- 测量了前庭眼反射 (tVOR和rVOR) 和前庭感官唤起潜力 (VsEP).
- 进行了前庭支柱支柱单单元记录.
主要成果:
- 脱发是剂量依赖的,影响不同区域的I型和II型毛细胞.
- 翻译前庭眼反射 (tVOR) 和VsEP保持完整,在斑点中毛细胞存活率高达75%.
- 旋转前庭眼反射 (rVOR) 显著降低,大约有31%的毛细胞存活在.
- 垂体 afferent 发射速度发生了变化,而垂体 afferent 显示出对旋转的敏感性降低.
结论:
- 成年老鼠的前置系统表现出显著的功能冗余.
- 斑点和凸斑块表现出不同的能力来维持功能,尽管大量的毛细胞损失.
- 发生了有限的毛细胞再生,但没有导致VORs的显著功能恢复.
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