鼠标嗅觉神经元轴突的内源再生中的区域缺陷
Tenzin Kunkhyen1, Kendall A Curtis1, Thomas P Deakin1
1Department of Neurobiology, University of Pittsburgh.
bioRxiv : the preprint server for biology
|June 10, 2025
概括
新生成的嗅觉感官神经元 (OSNs) 在受伤后无法完全重新内核化小鼠的嗅觉球泡 (OB). 背部OB的特定区域特异性缺陷持续存在,阻碍了嗅觉系统的功能恢复.
科学领域:
- 神经科学是一个神经科学.
- 再生医学是一种再生医学.
- 嗅觉系统生物学 嗅觉系统生物学
背景情况:
- 哺乳动物的神经发生是有限的,阻碍了受伤后的神经元的替代.
- 嗅觉上皮质 (OE) 中的嗅觉感官神经元 (OSN) 在一生中都会再生.
- 导航器OSN对于嗅球 (OB) 准至关重要,主要是围产期的.
研究的目的:
- 在选择性OSN切除和再生后,评估OB中OSN再内核的功能恢复.
- 通过新生成的OSNs来调查轴突再生和OB再内尔化的程度.
- 为了确定NOS在受伤后恢复神经的区域特异性赤字.
主要方法:
- 使用嗅毒药物甲基马,选择性切除OSNs,保留基底干细胞.
- 评估OB质层内OSN轴突中气味引起的反应.
- 摘除后10周和20周在不同OB区域的OSN轴突再内尔化的组织学分析.
主要成果:
- 经过切除后五周,在背部的OB轴突中观察到臭味引起的响应的严重缺陷,尽管OE重新填充.
- 持续的,区域特异性的OSN轴突在背部OB的再内尔化缺陷在10周和20周显而易见.
- 腹部,侧部和中部的OB区域在10周后显示出近乎完整的再生神经,与背部缺陷形成鲜明对比.
结论:
- 完整的OE再生并不能保证OB的完全功能性再生.
- 通过再生的 OSN 轴突存在显著的区域特异性缺陷,在背部OB重新内核化.
- 这项研究确定了一个模型来研究成年神经发生过程中成功与不成功的轴突再生背后的机制.
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