首页> 外文会议>Lancefield International Symposium on Streptococci and Streptococcal Diseases >Intermedilysin plays a key role in the invasion of human cells by Streptococcus intermedium
【24h】

Intermedilysin plays a key role in the invasion of human cells by Streptococcus intermedium

机译:含有链球菌中脑膜侵袭人体细胞的关键作用

获取原文

摘要

Streptococcus intemiedius, which causes endogenous infections leading to abscesses, produces intermedilysin (ILY), a human-specific cytolysin. Because of the significant correlation between higher ELY production levels by S. inteimedius and deep-seated abscesses, we constructed an ily knockout mutant and two complementation strains, (i) with the wild-type ily gene and (ii) with an ILY SS-mutant gene (the latter was not cytolytic without reductant due to an intramolecular SS bridge between domains 2 and 3), from ILY high level expressing strain UNS38, in order to investigate the role of ILY in deep-seated infections. Infection with the wild strain and the complementation strain secreting cytolytic ILY reduced the viability of human liver cell line HepG2 at infection but not of rat liver cell line BRL3A, and increased inrracellularly concomitantly with increasing HepG2 cell damage. Isogenic ily knockout mutant strain and the complementation strain secreting ELY SS-mutant were not cytotoxic and showed no proliferation in either cell line. Masking of cytotoxic strains with anti-ILY antibody drastically decreased adherence and invasion of HepG2. Moreover, coating ily knockout mutant strain with ILY partially restored adherence to HepG2 but without subsequent bacterial growth.
机译:细胞缺口,导致内源性感染导致脓肿,生成含有人特异性胞嘧啶(ILY)的中毒素(ILY)。由于S. Inteimedius和深骨脓肿的较高生产水平之间的显着相关性,我们用野生型Ily基因和(ii)构建了一种ILy敲除突变体和两个互补菌株(I),用I瓦斯 - 突变基因(后者不是由于结构域2和3之间的分子内SS桥)而无需还原剂,从ILy高水平表达菌株UNS38,以研究ILY在深层感染中的作用。用野生菌株和分泌细胞分解的互补菌株的感染降低了人肝细胞系HepG2在感染的活力,但不是大鼠肝细胞系BR13a,并随着Hepg2细胞损伤的增加而增加。 Isogenic Ily敲除突变诱导株和分泌的互补菌株I氏SS-突变体不是细胞毒性的并且在任一细胞系中显示出不增殖。用抗-1型抗体掩蔽细胞毒性菌株大大降低了Hepg2的粘附和侵袭。此外,涂覆易敲除突变体菌株的含有I硅部分恢复粘附到HepG2,但没有随后的细菌生长。

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