人工甜味剂不同地激活Drosophila中的甜味和苦味味神经元
Christian Arntsen1, Jake Grenon1, Isabelle Chauvel2
1Department of Biology, University of Vermont, Burlington, VT, USA.
Scientific reports
|July 2, 2025
概括
人工甜味剂触发复杂的味道信号,激活中的甜味和苦味受体. 这种双重激活会影响养行为,高度会引起厌恶.
科学领域:
- 神经科学是一个神经科学.
- 感官生物学 感官生物学
- 动物行为 动物行为
背景情况:
- 人工甜味剂是受欢迎的非营养化合物,具有争论的健康影响.
- 有证据表明,甜味剂与苦味受体相互作用,表明复杂的感官信号.
- 甜虫 (Drosophila melanogaster) 作为研究饮食影响和化学感觉的模型生物.
研究的目的:
- 为了研究Drosophila中人工甜味剂的基本感官特征.
- 为了确定甜味剂如何激活味觉受体神经元 (GRNs) 并影响养行为.
- 阐明甜味和苦味GRN联合激活在对甜味剂的行为反应中的作用.
主要方法:
- 评估了多种不同度的Drosophila中各种非热量甜味剂的食反应.
- 检查了甜味和苦味GRNs的细胞激活模式,这些GRNs在暴露于糖,再白酸A和酸盐时.
- 操纵苦味GRN活动,观察对糖的行为反应的影响.
主要成果:
- 所有测试的非热量甜味剂都在高度下抑制了食欲养.
- 苏克拉和雷巴迪oside A 协同激活了甜味和苦味的 GRNs; 亚斯巴甜只激活了苦味的 GRNs.
- 低度的苏克拉表示食欲强,而高度则表示厌恶.
- 沉默苦的GRNs减少了对糖的厌恶,增加了养行为.
结论:
- 人工甜味剂会产生一种比单纯的甜味更复杂的味觉信号.
- 甜味剂对苦味的联合激活对Drosophila的食有行为相关的影响.
- 这些发现表明,对人工甜味剂有灵活的行为反应机制.
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