Project description:Streptococcus suis is a major swine pathogen that can be transmitted to humans causing severe symptoms. A large human outbreak was described in China, where approximately 25% out of 215 infected humans developed an unusual streptococcal toxic shock-like syndrome (STSLS). Albeit increased expression of inflammatory mediators following infection by the Chinese S. suis strain was suggested as responsible for STSLS case severity, the mechanisms involved are still poorly understood. In this study, we investigated the host innate immune response to infection by either one of 3 strains of S. suis: 89-1591 (Canadian, intermediate virulence), P1/7 (European, high virulence), and SC84 (Chinese, epidemic strain). Using Illumina microarray and validating those results with qPCR and Luminex assay, infected mice showed elevated expression of mainly pro-inflammatory chemokine and cytokine genes. Generally, pro-inflammatory genes were expressed at a higher level in mice infected with S. suis strain SC84 > P1/7 > 89-1591. Interestingly, IFNγ was expressed at much higher levels only in mice infected with the S. suis strain SC84, which could potentially explain some of the STSLS symptoms. IFNγ-KO mice infected with SC84 showed better survival than WT mice while no differences was seen in mice infected with highly virulent P1/7 strain. Overall, our results show an important role of IFNγ in S. suis infections and might explain in part the increased virulence of SC84 responsible for a recent outbreak in China.

2013-03-27 | GSE41522 | GEO

Transcriptional profiling of a flpS knock-out strain of Steptococcus suis strain 10

Project description:Transcriptional profiling of a S. suis 10flpS::spcR mutant strain in which the flpS gene has been disrupted by an insertion of a spectinomycin resistance cassette (spcR). We compared the expression profile of S. suis strain 10 with that of S. suis strain 10flpS::spcR during exponential and stationary growth of the bacterial cells.

2016-10-11 | E-MTAB-3997 | biostudies-arrayexpress

Genome wide analysis of C57BL-6 mice infected with European strain (P1/7) of Streptococcus suis

2013-03-27 | GSE41521 | GEO