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Leucokinin signaling regulates hunger-driven reduction of behavioral responses to noxious heat in Drosophila.

Biochem. Biophys. Res. Commun.2018 May 05;499(2):221-226. Epub 2018 Mar 26
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摘要


In the fruitfly Drosophila melanogaster, hunger has a significant impact on its sensory systems and brain functions, and consequently modifies related behaviors. However, it remains unclarified whether hunger affects nociceptive behavioral responses to heat stimuli. In this study, we show that food deprivation reduces responses to noxious heat in wild-type flies. We further identified that the neuropeptide Leucokinin (Lk) and its receptor (Lkr) are essential for the reduction of responses to noxious heat. Temporal silencing of Lk-expressing neurons and a knockout mutation of Lkr generated using the CRISPR/Cas9 system inhibited the reduction of responses to noxious heat. Thus, our results reveal that hunger induces reduction of responses to noxious heat through the Lk/Lkr signaling pathway in Drosophila.

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