通过隔离斑马鱼中的多巴胺D2受体抑制氧气化学受体
Maddison Reed1, Michael G Jonz1,2
1Department of Biology, University of Ottawa, Ottawa, ON, Canada.
The Journal of physiology
|March 8, 2025
概括
多巴胺通过D2受体起作用,通过抑制神经上皮细胞,减弱斑马鱼中的氧气感应. 这表明多巴胺.
科学领域:
- 神经科学是一个神经科学.
- 进化生物学 进化生物学
- 比较生理学比较生理学
背景情况:
- 多巴胺是哺乳动物感应氧气的关键神经递质,特别是在带体中.
- 多巴胺在不同脊椎动物群体的氧气感应中的作用和进化意义在很大程度上仍未被探索.
- 斑马鱼在状神经皮质细胞 (NEC) 中具有多巴胺D2受体 (D2R),类似于哺乳动物的氧化化学受体,但功能机制尚未定义.
研究的目的:
- 通过减弱斑马鱼对缺氧的化学受体反应来调节氧气传感的预交会D2Rs假设.
- 为了阐明涉及多巴胺和D2R的信号通路在斑马鱼上氧化化学接收.
- 为了确定多巴胺在氧气感应中的作用是否在脊椎动物进化早期得到保护.
主要方法:
- 使用了从转基因斑马鱼 (Tg(elavl3:GCaMP6s)) 中分离的状制剂用于体内成像.
- 使用GCaMP指标测量了NEC和后突触神经元中细胞内度 ([Ca2+]i) 的缺氧诱导的变化.
- 服用多巴胺,D2R激动剂 (昆皮罗尔),D2R抗剂 (多佩里),腺环酶抑制剂 (SQ22536) 和激活剂 (弗斯科林) 来评估信号通路.
主要成果:
- 多巴胺或皮醇激活D2R可降低NEC中缺氧反应;多佩里可增强这些反应.
- 使用SQ22536抑制腺环酶模仿了多巴胺对缺氧诱导[Ca2+]i的抑制作用.
- 福斯科林部分逆转了多巴胺的抑制,表明基酶途径的参与.
- 后突触神经元的低氧诱导反应取决于NEC内化,并通过前突触D2R激活来调节.
- 在部的NEC神经突触中证明了缺氧信号的神经传递.
结论:
- 斑马鱼中的前突触D2Rs提供了一个反机制,减弱了化学受体对缺氧的反应.
- 这些发现揭示了多巴胺在通过D2R-adenylyl cyclase通路调节氧气传感中的保留和早期演变的作用.
- 这项研究建立了一个新的实验模型,用于研究完整的脊椎动物感官器官中的氧气传感,并提供了性化学接收中神经传递的证据.
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