首页> 外文期刊>Infection and immunity >An Arcanobacterium(Actinomyces) pyogenes Mutant Deficient in Production of the Pore-Forming Cytolysin Pyolysin Has Reduced Virulence
【24h】

An Arcanobacterium(Actinomyces) pyogenes Mutant Deficient in Production of the Pore-Forming Cytolysin Pyolysin Has Reduced Virulence

机译:产气孔的溶菌素的溶菌素生产不足的产弧菌(放线菌)化脓菌减少了毒力。

获取原文
           

摘要

Pyolysin (PLO), the hemolytic exotoxin expressed byArcanobacterium (Actinomyces)pyogenes, is a member of the thiol-activated cytolysin family of bacterial toxins. Insertional inactivation of theplo gene results in loss of expression of PLO with a concomitant loss in hemolytic activity. The plo mutant, PLO-1, has an approximately 1.8-log10 reduction in the 50% infectious dose compared to that for wild-type A. pyogenesin a mouse intraperitoneal infection model. Studies involving cochallenge of wild-type and PLO-1 bacteria resulted in recovery of similar numbers of both strains, suggesting that PLO production is required for survival in vivo. Recombinant, His-tagged PLO (His-PLO) is cytotoxic for mouse peritoneal macrophages and J774 cells in a dose-dependent manner. Protection against challenge with A. pyogenes could be afforded by vaccination with formalin-inactivated His-PLO, suggesting that PLO is a host-protective antigen, as well as a virulence determinant.
机译:溶菌素(PLO)是 Arcanobacterium Actinomyces pyogenes 所表达的溶血性外毒素,是硫辛基活化的细胞溶菌素细菌毒素家族的成员。 。 plo 基因的插入失活导致PLO表达丧失,同时溶血活性降低。与野生型 A相比, plo 突变体PLO-1的50%感染剂量降低了约1.8 log 10 。化脓原在小鼠腹腔感染模型中。涉及野生型和PLO-1细菌挑战的研究导致两种菌株的回收率相似,这表明在体内存活需要PLO产生。重组的带His标签的PLO(His-PLO)对小鼠腹膜巨噬细胞和J774细胞具有剂量依赖性的细胞毒性。保护免受 A挑战。化脓原可以通过福尔马林灭活的His-PLO疫苗接种而获得,这表明PLO是一种宿主保护性抗原,也是一种致病性决定因素。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号