肽聚糖识别蛋白AaPGRP-LC参与埃及伊蚊的抗细菌免疫反应

doi:10.16380/j.kcxb.2018.01.004

›› 2018, Vol. 61 ›› Issue (1): 25-35.doi: 10.16380/j.kcxb.2018.01.004

肽聚糖识别蛋白AaPGRP-LC参与埃及伊蚊的抗细菌免疫反应

杨青泰¹, 赵莉蔺^1,2, 邹振², 王燕红^2,*, 马瑞燕^1,*

（1. 山西农业大学农学院, 山西太谷 030801; 2. 中国科学院动物研究所, 农业虫害鼠害综合治理研究国家重点实验室, 北京 100101）

出版日期:2018-01-20 发布日期:2018-01-20

Peptidoglycan recognition protein AaPGRP-LC is involved in immune responses against bacteria in Aedes aegypti (Diptera: Culicidae)

YANG Qing-Tai¹, ZHAO Li-Lin^1,2, ZOU Zhen², WANG Yan-Hong^2,*, MA Rui-Yan^1,*

(1. College of Agriculture, Shanxi Agricultural University, Taigu, Shanxi 030801, China; 2. State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China)

Online:2018-01-20 Published:2018-01-20

摘要/Abstract

摘要： 【目的】阐明在响应细菌感染的过程中，埃及伊蚊Aedes aegypti体内肽聚糖识别蛋白PGRP-LC（AaPGRP-LC）的功能。【方法】使用实时荧光定量PCR（qPCR）技术分析埃及伊蚊感染阴沟肠杆菌Enterobacter cloacae后不同时间抗菌肽（antimicrobial peptides, AMPs）基因的表达情况。结合RNA干扰技术和qPCR技术检测干扰AaPGRP-LC后免疫相关基因转录模式的变化。使用原核表达系统表达AaPGRP-LC，并通过Ni²⁺-NTA柱纯化，通过免疫印迹分析检测所纯化蛋白的质量。【结果】阴沟肠杆菌感染埃及伊蚊6 h后埃及伊蚊体内抗菌肽基因的转录水平显著升高。干扰AaPGRP-LC并用阴沟肠杆菌感染后，埃及伊蚊体内重要抗菌肽基因的转录水平显著降低，同时埃及伊蚊免疫缺陷（immune-deficiency, IMD）通路和Toll信号（Toll-like receptors）通路的免疫相关基因的表达量也显著降低。纯化得到条带单一的AaPGRP-LC蛋白。【结论】AaPGRP-LC参与调控埃及伊蚊重要抗菌肽基因的转录，在埃及伊蚊响应细菌感染的过程中起到了重要的调控作用。AaPGRP-LC在参与调控IMD通路的同时，也可能参与了Toll信号通路的调控过程。从原核表达系统中获得的AaPGRP-LC重组蛋白可用于下一步的功能研究。

关键词: 埃及伊蚊, 天然免疫, 细菌, 肽聚糖识别蛋白, 抗菌肽

Abstract: 【Aim】 The objective of this study is to elucidate the roles of peptidoglycan recognition protein LC (PGRP-LC) in response to bacterial infection in Aedes aegypti. 【Methods】 The mRNA abundance of genes of antimicrobial peptides (AMPs) in mosquitoes at different time after infection of Enterobacter cloacae was measured by quantitative real-time PCR (qPCR). After interference of PGRP-LC by RNA interference (RNAi), the expression profiles of immune-related genes were detected by qPCR. The recombinant protein AaPGRP-LC was expressed by prokaryotic expression system and purified through a Ni²⁺-NTA agarose column. The quality of the purified recombinant protein was tested by Western blotting. 【Results】 Gram-negative E. cloacae bacteria could activate the expression of genes of AMPs in Ae. aegypti at 6 h post infection. After depletion of AaPGRP-LC, the transcription levels of genes of AMPs were significantly decreased during bacterial infection. The expression levels of immune-related genes involved in Toll and IMD pathways were down-regulated after interference of AaPGRP-LC. Western blotting of the purified recombinant protein AaPGRP-LC showed a clear and unique target band. 【Conclusion】 AaPGRP-LC modulates the transcriptional expression of genes of many essential AMPs and plays an important regulatory role in response to bacterial infection. It is involved in the regulation of IMD pathway and may also regulate the Toll pathway. The obtained recombinant AaPGRP-LC can be used in the follow-up study.

Key words: Aedes aegypti; innate immunity, bacteria, peptidoglycan recognition proteins, antimicrobial peptides

杨青泰, 赵莉蔺, 邹振, 王燕红, 马瑞燕. 肽聚糖识别蛋白AaPGRP-LC参与埃及伊蚊的抗细菌免疫反应[J]. , 2018, 61(1): 25-35.

YANG Qing-Tai, ZHAO Li-Lin, ZOU Zhen, WANG Yan-Hong, MA Rui-Yan. Peptidoglycan recognition protein AaPGRP-LC is involved in immune responses against bacteria in Aedes aegypti (Diptera: Culicidae)[J]. , 2018, 61(1): 25-35.

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http://www.insect.org.cn/CN/Y2018/V61/I1/25

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肽聚糖识别蛋白AaPGRP-LC参与埃及伊蚊的抗细菌免疫反应

Peptidoglycan recognition protein AaPGRP-LC is involved in immune responses against bacteria in Aedes aegypti (Diptera: Culicidae)

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