选择性终身抑制气味处理通道,以应对关键时期的经验
Hans C Leier1, Julius Jonaitis2, Alexander J Foden1
1Department of Neurosciences, Case Western Reserve University School of Medicine, Cleveland, OH, USA.
bioRxiv : the preprint server for biology
|August 12, 2025
概括
在多索菲拉的早期生活中暴露于乙酸 (EB) 导致质细胞削减Or42a嗅觉神经元 (OSN) 终端,从而导致终身的气味抑制. 这种可塑性是Or42a OSNs的特征,突出了它们在EB处理中的核心作用.
科学领域:
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
- 感官系统 感官系统
背景情况:
- 生命早期的感官电路在关键时期表现出经验依赖的可塑性.
- 在Drosophila中,嗅觉神经元 (OSN) 的轴突终端在关键时期因暴露于气味而受到质修剪.
- 之前的研究发现,在暴露于乙烯基丁酸盐 (EB) 后,Or42a OSN终端的质细胞化.
研究的目的:
- 确定关键期气味暴露对OSN反应的功能意义.
- 为了确定特定的OSN群体的质切割的电路选择性.
- 阐明差异修剪背后的机制及其对气味处理的影响.
主要方法:
- 两光子成像和基因编码的电压指示器ASAP5来评估OSN的气味引起的反应.
- 检查投射神经元 (PNs) 后突触到Or42a OSNs和Or43b OSNs的分析.
- 利用Drosophila连接体来研究抑制连接性的差异.
主要成果:
- 临界期EB暴露永久抑制了Or42a OSNs中的气味引起的反应.
- 质切割对VM7质体内的Or42a轴突终端具有选择性.
- Or43b OSNs显示了适度的修剪,但保留了EB灵敏度,与差异抑制连接相关.
结论:
- 关键时期的气味暴露会导致特定的OSN的长期功能变化.
- 在关键时期的质切割显示出在感觉回路内和感觉回路之间具有很高的选择性.
- Or42a OSNs在EB气味处理中发挥着核心作用,其选择性和深刻的反应对关键时期的可塑性证明了这一点.
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