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甲状腺激素信号传递对于小鼠耳根细胞的成熟和生存至关重要
XianHua Ma1, Fei Jiang2, Chunchun Wei1
1Department of Pathophysiology, Naval Medical University, Shanghai 200433, PR China.
Hearing research
|March 2, 2025
概括
甲状腺激素及其受体对于耳根细胞的发育和生存至关重要. 它们的缺失会损害细胞分化,降低内耳潜能 (EP),突出显示它们在维护听力方面的作用.
科学领域:
- 耳鼻喉科 耳鼻喉科 耳鼻喉科
- 发展生物学 发展生物学
- 内分泌学 在内分泌学.
背景情况:
- 甲状腺激素及其受体 (TRs) 对耳发育和内耳潜能 (EP) 维持至关重要.
- 耳外干根细胞与内淋巴平衡有关,但它们对甲状腺激素和TRs的依赖性尚不清楚.
研究的目的:
- 研究甲状腺激素和TRs在耳外根细胞的发育,分化和生存中的重要作用.
- 阐明耳上皮质和周围组织中TRs对EP维护的贡献.
主要方法:
- 使用甲状腺激素缺乏和选择性基因删除TRs (Thra和Thrb) 的小鼠模型.
- 进行了形态分析,基因表达概况 (转录组分析) 和EP的电生理学测量.
- 检查了对根细胞分化,生存和血管完整性的影响.
主要成果:
- 甲状腺激素缺乏和综合的Thra/Thrb删除损害了出生后的根细胞发育和生存.
- 删除TRα和TRβ,但不仅仅是TRβ,导致根细胞退化.
- 有条件的TR淘汰将EP降低了22%,转录组分析显示了根细胞特异性基因的下调.
结论:
- 在促进晚期根细胞分化和生存方面,TRα和TRβ起着冗余的作用.
- 耳上皮质中的TRs表达对于EP维护至关重要,TRs在周围组织 (如螺旋带纤维细胞) 中的贡献很重要.
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