A subset of octopaminergic neurons that promotes feeding initiation in Drosophila melanogaster.

A subset of octopaminergic neurons that promotes feeding initiation in Drosophila melanogaster.
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DOI:
10.1371/journal.pone.0198362
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Scott K
Scott K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Youn H;Kirkhart C;Chia J;Scott K

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章鱼胺调节黑腹果蝇的摄食行为反应,但其分子和回路机制尚未完全阐明。在这里,我们研究了章鱼胺能神经元子集OA-VPM4簇在蔗糖接受行为中的作用。含有OA-VPM4的Gal4系的热基因激活促进了长喙对蔗糖的延伸,而光基因失活则减少了长喙对蔗糖的延伸。解剖学上,OA-VPM4的突触前末端与糖反应性味觉感觉神经元的轴突非常接近。此外,RNAi选择性地敲除糖感味觉神经元中特定类型的章鱼胺受体OAMB,降低了对蔗糖的行为反应。通过钙成像实验,我们发现章鱼胺的应用增强了饱腹果蝇对蔗糖的感觉反应。综上所述,这些发现提出了一个模型,即OA-VPM4通过调节感觉神经元的活动来促进摄食行为。
Octopamine regulates feeding behavioral responses in Drosophila melanogaster, however the molecular and circuit mechanisms have not been fully elucidated. Here, we investigated the role of a subset of octopaminergic neurons, the OA-VPM4 cluster, in sucrose acceptance behavior. Thermogenetic activation of Gal4 lines containing OA-VPM4 promoted proboscis extension to sucrose, while optogenetic inactivation reduced extension. Anatomically, the presynaptic terminals of OA-VPM4 are in close proximity to the axons of sugar-responsive gustatory sensory neurons. Moreover, RNAi knockdown of a specific class of octopamine receptor, OAMB, selectively in sugar-sensing gustatory neurons decreased the behavioral response to sucrose. By calcium imaging experiments, we found that application of octopamine potentiates sensory responses to sucrose in satiated flies. Taken together, these findings suggest a model by which OA-VPM4 promotes feeding behavior by modulating the activity of sensory neurons.
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