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Characterization of sulfakinin and its role in larval feeding and molting in Spodoptera frugiperda

文献类型： 外文期刊

作者： Yu, Ming-Qing 1 ; Linghu, Jun-Hong 1 ; Xie, Hua-Yan 1 ; Li, Gang 1 ; Zhu, Feng 2 ; Smagghe, Guy 1 ; Gui, Shun-Hua 1 ; Liu, Tong-Xian 1 ;

作者机构： 1.Guizhou Univ, Inst Entomol, Guizhou Prov Key Lab Agr Pest Management Mountaino, Guiyang, Peoples R China

2.Guizhou Acad Agr Sci, Inst Plant Protect, Guizhou Ctr Pesticide Risk Monitoring, Guiyang, Peoples R China

3.Guizhou Univ, Inst Plant Hlth & Med, Guiyang, Peoples R China

关键词： ecdysteroid; feeding; molting; neuropeptide; RNA interference; Spodoptera frugiperda; sulfakinin

期刊名称：INSECT SCIENCE （ 影响因子：3.0； 五年影响因子：3.5 ）

ISSN： 1672-9609

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Feeding and molting are particularly important physiological processes for insects, and it has been reported that neuropeptides are involved in the nervous regulation of these 2 processes. Sulfakinin (SK) is an important neuropeptide that is widely distributed among insects and plays a pivotal role in regulating feeding, courtship, aggression, and locomotion. In this study, we investigated the involvement of SK in feeding and molting on a highly notorious pest insect, the fall armyworm, Spodoptera frugiperda. SK transcript levels were found in all larval stages and there was a predominant expression of SK in the brain of 5th instar larvae. By immunostaining, SK was detected in 2 pairs of cells in the median protocerebrum. But during prolonged periods of starvation, there was a significant reduction in SK messenger RNA levels; however, subsequent refeeding led to a notable increase. To investigate the role of SK in feeding and molting, SK was silenced in S. frugiperda larvae through RNA interference. This resulted in a significant increase in food intake, weight gain, and the molting process happened more rapidly in the double-stranded SK-treated larvae compared to the controls. Conversely, injection of sulfated SK peptide (sSK) caused opposite effects. Interestingly, SK-knockdown in larvae resulted in increased levels of 20-hydroxyecdysone and also of the expression of some of it signaling pathway genes. Altogether, this study highlights the important role played by SK in regulating feeding and molting in S. frugiperda.

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