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The molecular characterization and protective efficacy of microneme 3 of Eimeria mitis in chickens

文献类型： 外文期刊

作者： Huang, Xinmei 1 ; Liu, Jianhua 1 ; Tian, Di 1 ; Li, Wenyu 1 ; Zhou, Zhouyang 1 ; Huang, Jianmei 1 ; Song, Xiaokai 1 ; Xu, 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Vet Med, MOE Joint Int Res Lab Anim Hlth & Food Safety, Nanjing 210095, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Vet Med, Nanjing 210014, Jiangsu, Peoples R China

关键词： Eimeria mitts; Microneme 3; Protective efficacy

期刊名称：VETERINARY PARASITOLOGY （ 影响因子：2.738； 五年影响因子：2.951 ）

ISSN： 0304-4017

年卷期： 2018 年 258 卷

页码：

收录情况： SCI

摘要： E. mitis is ubiquitous in clinical coccidiosis caused by mixed infection of Eimeria species and the infection by E. mitts usually significantly impairs productivity of the infected chickens. To date, however, few protective antigens from E. mills have been reported. In this study, the molecular characterization and protective efficacy of microneme 3 of Eimeria mitis (EmiMIC3) were analyzed. EmiMIC3 gene was cloned from sporozoites of E. mitis and its MARs (microneme adhesive repeats domain) were predicted. Recombinant EmiMIC3 (rEmiMIC3) was expressed in E. colt and purified and then was analyzed by western blot with anti-E. mitis chicken serum. Meanwhile, native EmiMIC3 from sporozoites was analyzed by anti-rEmiMIC3 rat serum. The expressions of EmiMIC3 in E. mitts sporozoites and merozoites were analyzed by immunofluorescence assay. The rEmiMIC3-induced changes of T lymphocytes subpopulation, serum cytokines and IgY levels and the protective efficacy of rEmiMIC3 were determined in animal experiments. The results showed that the deduced open reading frame (ORF) of EmiMIC3 was composed of 1145 amino acids, possessing 9 MARs. EmiMIC3 gene was submitted to GenBank (accession number: MG888670). EmiMIC3 could express in sporozoites and merozoites respectively and located at the apex of E. mitis sporozoite. Western blot assay revealed that the rEmiMIC3 could be recognized by serum of chicken infected by E. odds and the native EmiMIC3 from sporozoites could also be recognized by rat serum against rEmiMIC3. Following vaccination with rEmiMIC3, higher levels of IL-10, IFN-gamma, TGF-beta and IL-17, higher proportions of CD4 + /CD3 + and CD8 + /CD3 + T lymphocytes and higher level of IgY antibody were induced compared to the controls. Vaccination with rEmiMIC3 prominently increased the weight gains and decreased oocyst output of the vaccinated chickens after challenge infection. Our result not only enriches protective candidate antigen of E. odds, but also provides available protective antigen of E. mills for the development of multivalent vaccines against infection caused by mixture of Eimeria species in clinical coccidiosis.

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