阿罗亚
生物
免疫原性
微生物学
减毒疫苗
斑马鱼
免疫系统
毒力
弗朗西塞拉
病毒学
接种疫苗
基因
免疫学
遗传学
肠杆菌科
土拉弗朗西斯菌
大肠杆菌
作者
Bichitrananda Swain,Cole T. Powell,Roy Curtiss
标识
DOI:10.1016/j.micpath.2021.105355
摘要
Vaccination remains the most effective approach for prevention and control of infectious diseases in aquaculture. Edwardsiella piscicida is a causative agent of edwardsiellosis leading to mass mortality in a variety of fish species, leading to huge economic losses in the aquaculture industry. In this study, we have deleted the aroA and phoP genes in E. piscicida and investigated the phenotype, degrees of attenuation, immunogenicity, and ability to confer immune protection in zebrafish host. Our vaccine strain χ16028 with genotype ΔaroA11 ΔphoP12, showed significantly reduced growth, motility, biofilm formation and intracellular replication compared to the wild-type strain J118. In this regard, χ16028 exhibited retarded colonization and attenuation phenotype in zebrafish. Studies showed that χ16028 induced TLR4 and TLR5 mediated NF-kB pathway and upregulated cytokine gene expression i.e., TNF-α, IL-1β, IL-6, IL-8 and type-I IFN in zebrafish. Zebrafish immunized by intracoelomic injection (i.c.) with χ16028 showed systemic and mucosal IgM responses and protection against the wild-type E. piscicida i.c. injection challenge. However, the protection was only 25% in zebrafish following i.c. challenge. We speculate that our vaccine strain might be very attenuated; a booster dose may trigger better immune response and increase the percentage of survival to a more significant level.
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