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20-Hydroxyecdysone enhances Immulectin-1 mediated immune response against entomogenous fungus in Locusta migratoria

文献类型： 外文期刊

作者： Han, Pengfei 1 ; Han, Jiao 1 ; Zhang, Min 1 ; Fan, Jiqiao 3 ; Gong, Qitian 1 ; Ma, Enbo 1 ; Zhang, Jianzhen 1 ;

作者机构： 1.Shanxi Univ, Inst Appl Biol, Taiyuan 030006, Peoples R China

2.Shanxi Univ, Coll Life Sci, Taiyuan, Peoples R China

3.Shanxi Key Lab Integrated Pest Management Agr, Taiyuan, Shanxi, Peoples R China

4.Shanxi Acad Agr Sci, Inst Plant Protect, Taiyuan, Peoples R China

关键词： Immulectin-1; 20-hydroxyecdysone; immune response; Locustamigratoria

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

ISSN： 1526-498X

年卷期： 2020 年 76 卷 1 期

页码：

收录情况： SCI

摘要： BACKGROUND: Entomogenous fungi are important factors in biological control, but innate immunity of insects restricts the efficiency of fungus infection. 20-hydroxyecdysone (20E) is involved in regulating the immune response of insects. Our previous studies have revealed that 20E enhances the expression of antibacterial peptides in the worldwide pest Locusta migratoria. However, the mechanism by which 20E controls innate immunity against entomogenous fungi is still unknown. RESULTS: In the present study, based on the transcriptome of L. migratoria fat bodies challenged by 20E, immulectin-1 (LmIML-1) was screened and identified to be involved in modulating antifungal immunity. Spatio-temporal expression analysis showed LmIML-1 was highly expressed in the fifth instar nymph stage, and mainly distributed in the fat bodies and hemolymph. Both exogenous and endogenous 20E could increase the transcription of LmIML-1. In contrast, transcription of LmIML-1 did not increase when the 20E signal was blocked by RNAi of LmEcR (ecdysone receptor). The expressed recombinant protein rLmIML-1 possessed agglutination activity and promoted the encapsulation. RNA interference of LmIML-1 reduced the encapsulation of hemocytes, decreased the antifungal activity of plasma against Metarhizium anisopliae and accelerated the death of nymphs under the stress of entomogenous fungus. Meanwhile, 20E did not increase the antifungal activity with silence of LmIML-1 in L. migratoria. CONCLUSION: 20E enhances antifungal immunity by activating immulectin-1 in L. migratoria. Our findings indicate a potential mechanism of 20E systematically regulating innate immune response to resist pathogens and provide a well-defined molecular target for improving biological control. (c) 2019 Society of Chemical Industry

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