Exorista sorbillans (Diptera: Tachinidae) parasitism shortens host larvae growth duration by regulating ecdysone and juvenile hormone titers in Bombyx mori (Lepidoptera: Bombycidae).

Content Provider	Europe PMC
Author	Wang, Shan-shan Wang, Lei-lei Pu, Yue-xia Liu, Ji-yin Wang, Mei-xian Zhu, Juan Shen, Zhong-yuan Shen, Xing-jia Tang, Shun-ming
Editor	Swevers, Luc
Copyright Year	2023
Abstract	The tachinid fly, Exorista sorbillans, is a notorious ovolarviparous endoparasitoid of the silkworm, Bombyx mori, causing severe damage to silkworm cocoon industry. Silkworm larvae show typically precocious wandering behavior after being parasitized by E. sorbillans; however, the underlying molecular mechanism remains unexplored. Herein, we investigated the changes in the levels of 20-hydroxyecdysone (20E) and juvenile hormone (JH) titer, and they both increased in the hemolymph of parasitized silkworms. Furthermore, we verified the expression patterns of related genes, which showed an upregulation of 20E signaling and biosynthesis genes but a significant downregulation of ecdysone oxidase (EO), a 20E inactivation enzyme, in parasitized silkworms. In addition, related genes of the JH signaling were activated in parasitized silkworms, while related genes of the JH degradation pathway were suppressed, resulting in an increase in JH titer. Notably, the precocious wandering behavior of parasitized silkworms was partly recoverable by silencing the transcriptions of BmCYP302A1 or BmCYP307A1 genes. Our findings suggest that the developmental duration of silkworm post parasitism could be shortened by regulation of 20E and JH titers, which may help silkworm to resist the E. sorbillans infestation. These findings provide a basis for deeper insight into the interplay between silkworms and E. sorbillans and may serve as a reference for the development of a novel approach to control silkworm myiasis.
Page Count	11
Journal	Journal of Insect Science
Volume Number	23
PubMed Central reference number	PMC10231458
Issue Number	3
PubMed reference number	37256698
e-ISSN	15362442
DOI	10.1093/jisesa/iead034
Language	English
Publisher	Oxford University Press
Publisher Date	2023-05-01
Publisher Place	US
Access Restriction	Open
Rights License	This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com © The Author(s) 2023. Published by Oxford University Press on behalf of Entomological Society of America.
Subject Keyword	tachinid parasitoid Bombyx mori 20-hydroxyecdysone juvenile hormone RNA interference
Content Type	Text
Resource Type	Article
Subject	Medicine Insect Science