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硫素减少酶TrxB Salmonella Enteritidis Salmonella Enteritidis 的淘汰突变体的表征和免疫保护
Siping Zhu1, Lili Wang1, Hong Li1
1Hebei key laboratory of preventive veterinary medicine, Hebei Normal University of Science & Technology, Qinhuangdao, China.
Frontiers in cellular and infection microbiology
|October 3, 2025
概括
沙门氏菌Enteritidis TrxB对细菌毒性至关重要,影响其运动性,抗压力和宿主细胞入侵. 删除TrxB基因显著降低了病原性,并为开发新的沙门氏菌疫苗提供了潜力.
科学领域:
- 微生物学 微生物学
- 病原体生物学 病原体生物学
- 免疫学 免疫学 免疫学
背景情况:
- 沙门氏菌 Enteritidis (S. Enteritidis) 是一种影响动物和人类健康的动物性病原体.
- 氨酸还原酶 (TrxB) 系统对于细胞的氧化还原平衡至关重要,但其在S. Enteritidis病原性中的作用尚不清楚.
研究的目的:
- 为了研究TrxB在S. Enteritidis毒性的功能.
- 评估TrxB删除对细菌生物特征和病原性的影响.
主要方法:
- 产生了一个trxB缺乏的S.Enteritidis菌株 (ΔtrxB).
- 评估了ΔtrxB对环境压力的耐受性,生物膜的形成,运动性,粘附性,入侵性,细胞内生存率和LD50.0.
- 在小鼠中评估了病毒性基因表达,体内殖民化和免疫保护作用.
主要成果:
- 删除TrxB会降低机动性,药物耐药性,生物膜形成和耐压力,但不会影响生长.
- 在 ΔtrxB 中,宿主细胞的粘附,入侵和细胞内增殖显著下降.
- ΔtrxB菌株的病原性显著降低 (LD50增加了100倍以上),病毒性基因表达率降低.
- 用ΔtrxB进行免疫接种提供了对S. Enteritidis挑战的保护.
结论:
- TrxB是S. Enteritidis的一个关键毒性因子.
- 准TrxB可能是控制S. Enteritidis感染的一种策略.
- trxB突变体显示出作为活体减弱疫苗候选人的希望.
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