Mosquito Defensins Enhance Japanese Encephalitis Virus Infection by Facilitating Virus Adsorption and Entry within the Mosquito
文献类型： 外文期刊
作者： Liu, Ke 1 ; Xiao, Changguang 1 ; Xi, Shumin 1 ; Hameed, Muddassar 1 ; Wahaab, Abdul 1 ; Shao, Donghua 1 ; Li, Zongjie; 1 ;
作者机构： 1.Chinese Acad Agr Sci, Shanghai Vet Res Inst, Shanghai, Peoples R China
2.Second Mil Med Univ, Dept Pathogen Biol, Shanghai, Peoples R China
3.Shanghai Acad Agr Sci, Inst Anim Husb & Vet Sci, Shanghai, Peoples R China
关键词： Japanese encephalitis virus; mosquito defensin; adsorption; infection in mosquito; transmission potential
期刊名称：JOURNAL OF VIROLOGY （ 影响因子：5.103； 五年影响因子：5.078 ）
ISSN： 0022-538X
年卷期： 2020 年 94 卷 21 期
页码：
收录情况： SCI
摘要： Japanese encephalitis virus (JEV) is a viral zoonosis that can cause viral encephalitis, death, and disability. Although the Culex mosquito is the primary vector of JEV, little is known about JEV transmission by this kind of mosquito. Here, we found that mosquito defensin facilitated the adsorption of JEV on target cells via the defensin/lipoprotein receptor-related protein 2 (LRP2) axis. Mosquito defensin bound the ED III domain of the viral envelope (E) protein and directly mediated efficient virus adsorption on the target cell surface; the receptor LRP2, which is expressed on the cell surface, affected defensin-dependent adsorption. As a result, mosquito defensin enhanced JEV infection in the salivary gland, increasing the possibility of viral transmission by mosquitoes. These findings demonstrate the novel role of mosquito defensin in JEV infection and the mechanisms through which the virus exploits mosquito defensin for infection and transmission. IMPORTANCE In this study, we observed the complex roles of mosquito defensin in JEV infection; mosquito defensin exhibited a weak antiviral effect but strongly enhanced binding. In the latter, defensin directly binds the ED III domain of the viral E protein and promotes the adsorption of JEV to target cells by interacting with lipoprotein receptor-related protein 2 (LRP2), thus accelerating virus entry. Together, our results indicate that mosquito defensin plays an important role in facilitating JEV infection and potential transmission.
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