A fructose receptor functions as a nutrient sensor in the Drosophila brain.

A fructose receptor functions as a nutrient sensor in the Drosophila brain.
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DOI:
10.1016/j.cell.2012.10.024
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发表时间:
2012-11-21
期刊:
影响因子:
64.5
通讯作者:
Amrein H
Amrein H
中科院分区:
生物学1区
文献类型:
--
作者:
Miyamoto T;Slone J;Song X;Amrein H

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体内营养传感器在摄食行为中起重要作用,但其分子结构和作用机制尚不清楚。利用Ca2+成像和行为分析,我们表明味觉受体43a在味觉神经元中作为一种窄调谐的果糖受体发挥作用。值得注意的是,GR43a在大脑中也起到果糖受体的作用。有趣的是,血淋巴果糖水平与摄食状态密切相关:在营养碳水化合物摄入后,果糖水平上升数倍,达到足以激活大脑GR43a的浓度。通过使用不同的摄食模式和人工激活表达GR43a的脑神经元,我们发现GR43a是饥饿果蝇感知血淋巴果糖和促进摄食的必要和充分条件,但在饱腹果蝇中抑制摄食。因此,我们的研究表明,表达gr43a的脑神经元作为血淋巴果糖的营养传感器,并以饱足依赖的方式为摄食体验分配相反的价。
Internal nutrient sensors play important roles in feeding behavior, yet their molecular structure and mechanism of action are poorly understood. Using Ca2+ imaging and behavioral assays, we show that the Gustatory Receptor 43a functions as a narrowly tuned fructose receptor in taste neurons. Remarkably, GR43a also functions as a fructose receptor in the brain. Interestingly, hemolymph fructose levels are tightly linked to feeding status: after nutritious carbohydrate consumption, fructose levels rise several fold and reach a concentration sufficient to activate GR43a in the brain. By using different feeding paradigms and artificial activation of Gr43a-expressing brain neurons, we show that GR43a is both necessary and sufficient to sense hemolymph fructose and promote feeding in hungry flies, but suppress feeding in satiated flies. Thus, our studies indicate that the Gr43a-expressing brain neurons function as a nutrient sensor for hemolymph fructose and assign opposing valence to feeding experiences in a satiation-dependent manner.
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