通过抑制性气味剂改变Drosophila的二氧化碳回避行为
Stephanie Lynn Turner1, Anandasankar Ray
1Cellular, Molecular, and Developmental Biology Program, University of California, Riverside, California 92521, USA.
Nature
|August 28, 2009
概括
食品气味剂可以通过作用于CO2受体来抑制果对二氧化碳 (CO2) 的天生的避开. 这一发现揭示了嗅觉反应是如何根据环境调节的,并对蚊子控制有影响.
科学领域:
- 神经科学是一个神经科学.
- 嗅觉系统 嗅觉系统
- 行为生物学 行为生物学
背景情况:
- 果 (Drosophila melanogaster) 具有对二氧化碳 (CO2) 的天生的回避行为.
- 这种避免CO2排放对于检测受压力的至关重要,但必须克服它才能获得像成熟水果这样的必需食物来源.
- 这种上下文依赖的行为修改背后的分子和神经元机制尚不清楚.
研究的目的:
- 研究果如何修改其先天的CO2回避行为的分子和神经元基础.
- 识别特定的气味剂,可以抑制对CO2敏感的神经元并改变避免反应.
- 探索这些发现对理解嗅觉编码和昆虫传播疾病传播的潜在影响.
主要方法:
- 鉴定抑制果天线中对CO2敏感神经元的新型食品气味剂.
- 使用体内表达系统来确认气味与Gr21a/Gr63a CO2受体的相互作用.
- 行为测试测量气味剂对CO2中介回避的影响,并分析时间抑制动态.
主要成果:
- 确定了一种新型的食品气味剂,可以直接抑制对CO2敏感的神经元.
- 这些气味剂作用于Gr21a/Gr63a CO2受体,显著减少CO2中介的避开行为.
- 一种气味剂表现出长时间的抑制,导致CO2避免反应的持续抑制,即使在暴露停止后也是如此.
- 在Culex蚊子中观察到类似的抑制作用,影响它们的CO2检测.
结论:
- 对CO2的行为回避是通过新型食物气味剂和CO2受体之间的抑制相互作用直接调节的.
- 这项研究强调了抑制性气味剂在嗅觉编码和上下文依赖行为的关键作用.
- 研究结果表明,可能有策略来破坏CO2介导的宿主寻找行为,例如蚊子等携带疾病的昆虫.
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