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Streptococcus suis

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https://www.readbyqxmd.com/read/28425925/evaluation-of-the-immunomodulatory-properties-of-streptococcus-suis-and-group-b-streptococcus-capsular-polysaccharides-on-the-humoral-response
#1
Cynthia Calzas, Morgan Taillardet, Insaf Salem Fourati, David Roy, Marcelo Gottschalk, Hugo Soudeyns, Thierry Defrance, Mariela Segura
Streptococcus suis and group B Streptococcus (GBS) are encapsulated streptococci causing septicemia and meningitis. Antibodies (Abs) against capsular polysaccharides (CPSs) have a crucial protective role, but the structure/composition of the CPS, including the presence of sialic acid, may interfere with the generation of anti-CPS Ab responses. We investigated the features of the CPS-specific Ab response directed against S. suis serotypes 2 and 14 and GBS serotypes III and V after infection or immunization with purified native or desialylated CPSs in mice...
April 20, 2017: Pathogens
https://www.readbyqxmd.com/read/28407026/streptococcal-adhesin-p-sadp-contributes-to-streptococcus-suis-adhesion-to-the-human-intestinal-epithelium
#2
Maria Laura Ferrando, Niels Willemse, Edoardo Zaccaria, Yvonne Pannekoek, Arie van der Ende, Constance Schultsz
BACKGROUND: Streptococcus suis is a zoonotic pathogen, causing meningitis and septicemia. We previously demonstrated that the gastrointestinal tract (GIT) is an entry site for zoonotic S. suis infection. Here we studied the contribution of Streptococcal adhesin Protein (SadP) to host-pathogen interaction at GIT level. METHODS: SadP expression in presence of Intestinal Epithelial Cells (IEC) was compared with expression of other virulence factors by measuring transcript levels using quantitative Real Time PCR (qRT-PCR)...
2017: PloS One
https://www.readbyqxmd.com/read/28402705/interaction-of-factor-h-binding-protein-of-streptococcus-suis-with-globotriaosylceramide-promotes-the-development-of-meningitis
#3
Decong Kong, Zhe Chen, Junping Wang, Qingyu Lv, Hua Jiang, Yuling Zheng, Maokai Xu, Xuyu Zhou, Huaijie Hao, Yongqiang Jiang
Streptococcus suis is an important emerging zoonotic agent that causes acute bacterial meningitis in humans with high mortality and morbidity. Our previous work showed that factor H-binding protein (Fhb) contributed to virulence of S. suis, but the role of Fhb in the development of S. suis meningitis remained unclear. In this study, we demonstrated for the first time that Fhb contributed to the traversal of S. suis across the human blood-brain barrier by allelic-exchange mutagenesis, complementation and specific antibody blocking studies...
April 12, 2017: Virulence
https://www.readbyqxmd.com/read/28379509/a-locus-encoding-variable-defence-systems-against-invading-dna-identified-in-streptococcus-suis
#4
Masatoshi Okura, Takashi Nozawa, Takayasu Watanabe, Kazunori Murase, Ichiro Nakagawa, Daisuke Takamatsu, Makoto Osaki, Tsutomu Sekizaki, Marcelo Gottschalk, Shigeyuki Hamada, Fumito Maruyama
Streptococcus suis, an important zoonotic pathogen, is known to have an open pan-genome and to develop a competent state. In S. suis, limited genetic lineages are suggested to be associated with zoonosis. However, little is known about the evolution of diversified lineages and their respective phenotypic or ecological characteristics. In this study, we performed comparative genome analyses of S. suis, with a focus on the competence genes, mobile genetic elements (MGEs), and genetic elements related to various defence systems against exogenous DNAs (defence elements) that are associated with gene gain/loss/exchange mediated by horizontal DNA movements and their restrictions...
April 4, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28373968/streptococcus-suis-serotype-2-biofilms-inhibit-the-formation-of-neutrophil-extracellular-traps
#5
Fang Ma, Li Yi, Ningwei Yu, Guangyu Wang, Zhe Ma, Huixing Lin, Hongjie Fan
Invasive infections caused by Streptococcus suis serotype 2 (SS2) has emerged as a clinical problem in recent years. Neutrophil extracellular traps (NETs) are an important mechanism for the trapping and killing of pathogens that are resistant to phagocytosis. Biofilm formation can protect bacteria from being killed by phagocytes. Until now, there have only been a few studies that focused on the interactions between bacterial biofilms and NETs. SS2 in both a biofilm state and a planktonic cell state were incubated with phagocytes and NETs, and bacterial survival was assessed...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28373868/morin-attenuates-streptococcus-suis-pathogenicity-in-mice-by-neutralizing-suilysin-activity
#6
Gen Li, Gejin Lu, Zhimin Qi, Hongen Li, Lin Wang, Yanhui Wang, Bowen Liu, Xiaodi Niu, Xuming Deng, Jianfeng Wang
Streptococcus suis, a Gram-positive pathogen, is widely recognized as an important agent of swine infection, and it is also known to cause a variety of zoonoses, such as meningitis, polyarthritis and pneumonia. Suilysin (SLY), an extracellular pore-forming toxin that belongs to the cholesterol-dependent cytolysin family, is an essential virulence factor of S. suis capsular type 2 (SS2). Here, we found that morin hydrate (morin), a natural flavonoid that lacks anti-SS2 activity, inhibits the hemolytic activity of SLY, protects J774 cells from SS2-induced injury and protects mice from SS2 infection...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28362221/the-non-conserved-region-of-mrp-is-involved-in-the-virulence-of-streptococcus-suis-serotype-2
#7
Quan Li, Yang Fu, Caifeng Ma, Yanan He, Yanfei Yu, Dechao Du, Huochun Yao, Chengping Lu, Wei Zhang
Muramidase-released protein (MRP) of Streptococcus suis serotype 2 (SS2) is an important epidemic virulence marker with an unclear role in bacterial infection. To investigate the biological functions of MRP, three mutants named Δmrp, Δmrp domain 1 (Δmrp-d1), and Δmrp domain 2 (Δmrp-d2) were constructed to assess the phenotypic changes between the parental strain and the mutant strains. The results indicated that MRP domain 1 (MRP-D1, the non-conserved region of MRP from a virulent strain, a.a. 242-596) played a critical role in adherence of SS2 to host cells, compared with MRP domain 1* (MRP-D1*, the non-conserved region of MRP from a low virulent strain, a...
March 31, 2017: Virulence
https://www.readbyqxmd.com/read/28348788/streptococcus-suis-serotype-2-strains-isolated-in-argentina-south-america-are-different-from-those-recovered-in-north-america-and-present-a-higher-risk-for-humans
#8
Raquel Callejo, Han Zheng, Pengcheng Du, Monica Prieto, Jianguo Xu, Gustavo Zielinski, Jean-Philippe Auger, Marcelo Gottschalk
INTRODUCTION: Streptococcus suis serotype 2 is an important swine pathogen and emerging zoonotic agent causing meningitis and septicemia/septic shock. Strains are usually virulent (Eurasia) or of intermediate/low virulence (North America). Very few data regarding human and swine isolates from South America are available. CASE PRESENTATION: Seventeen new human S. suis cases in Argentina (16 serotype 2 strains and a serotype 5 strain) are reported. Alongside, 14 isolates from pigs are analyzed: 12 from systemic disease, one from lungs and one from tonsils of a healthy animal...
October 2016: JMM Case Reports
https://www.readbyqxmd.com/read/28348142/survey-of-susceptibility-to-marbofloxacin-in-bacteria-isolated-from-diseased-pigs-in-europe
#9
F El Garch, S Kroemer, D Galland, I Morrissey, F Woehrle
A monitoring programme of marbofloxacin susceptibility of bacteria from Europe causing respiratory tract infection and meningitis in pigs has been active since 1994 and 2002, respectively. Monitoring digestive, metritis and urinary tract infection (UTI) in pigs has been active since 2005 and susceptibility results until 2013 are presented. Minimum inhibitory concentration (MIC) was determined by broth microdilution. For MIC interpretation, Vétoquinol-evaluated breakpoints were applied. For digestive pathogens, Escherichia coli and Salmonella species (1717 and 300 isolates, respectively) exhibited 7...
March 27, 2017: Veterinary Record
https://www.readbyqxmd.com/read/28327531/porcine-dendritic-cells-as-an-in-vitro-model-to-assess-the-immunological-behaviour-of-streptococcus-suis-subunit-vaccine-formulations-and-the-polarizing-effect-of-adjuvants
#10
Léa Martelet, Sonia Lacouture, Guillaume Goyette-Desjardins, Guy Beauchamp, Charles Surprenant, Marcelo Gottschalk, Mariela Segura
An in vitro porcine bone marrow-derived dendritic cell (DC) culture was developed as a model for evaluating immune polarization induced by adjuvants when administered with immunogens that may become vaccine candidates if appropriately formulated. The swine pathogen Streptococcus suis was chosen as a prototype to evaluate proposed S. suis vaccine candidates in combination with the adjuvants Poly I:C, Quil A ®, Alhydrogel ®, TiterMax Gold ® and Stimune ®. The toll-like receptor ligand Poly I:C and the saponin Quil A ® polarized swine DC cytokines towards a type 1 phenotype, with preferential production of IL-12 and TNF-α...
March 22, 2017: Pathogens
https://www.readbyqxmd.com/read/28326294/the-eukaryote-like-serine-threonine-kinase-stk-regulates-the-growth-and-metabolism-of-zoonotic-streptococcus-suis
#11
Chunyan Zhang, Wen Sun, Meifang Tan, Mengmeng Dong, Wanquan Liu, Ting Gao, Lu Li, Zhuofei Xu, Rui Zhou
Like eukaryotes, bacteria express one or more serine/threonine kinases (STKs) that initiate diverse signaling networks. The STK from Streptococcus suis is encoded by a single-copy stk gene, which is crucial in stress response and virulence. To further understand the regulatory mechanism of STK in S. suis, a stk deletion strain (Δstk) and its complementary strain (CΔstk) were constructed to systematically decode STK characteristics by applying whole transcriptome RNA sequencing (RNA-Seq) and phosphoproteomic analysis...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28319184/streptococcus-suis-sortase-a-is-ca2-independent-and-is-inhibited-by-acteoside-isoquercitrin-and-baicalin
#12
Fuguang Chen, Fang Xie, Baoling Yang, Chengcheng Wang, Siguo Liu, Yueling Zhang
Sortase A (SrtA) has long been recognized as an ideal drug target for therapeutic agents against Gram-positive pathogens. However, the SrtA of Streptococcus suis (Ss-SrtA), an important zoonotic agent, has not been studied. In this study, the enzymatic properties of Ss-SrtA were investigated, and inhibition of Ss-SrtA by natural products was evaluated. Ss-SrtA was expressed and purified. The purified recombinant Ss-SrtA had maximal activity at pH 6.0-7.5, 45°C, and showed a Km of 6.7 μM for the hydrolysis of substrate abz-LPATG-dnp...
2017: PloS One
https://www.readbyqxmd.com/read/28314074/better-understanding-of-homologous-recombination-through-a-12-week-laboratory-course-for-undergraduates-majoring-in-biotechnology
#13
Ming Li, Xiaodong Shen, Yan Zhao, Xiaomei Hu, Fuquan Hu, Xiancai Rao
Homologous recombination, a central concept in biology, is defined as the exchange of DNA strands between two similar or identical nucleotide sequences. Unfortunately, undergraduate students majoring in biotechnology often experience difficulties in understanding the molecular basis of homologous recombination. In this study, we developed and implemented a 12-week laboratory course for biotechnology undergraduates in which gene targeting in Streptococcus suis was used to facilitate their understanding of the basic concept and process of homologous recombination...
March 17, 2017: Biochemistry and Molecular Biology Education
https://www.readbyqxmd.com/read/28292261/genome-wide-analysis-of-a-avirulent-and-reveal-the-strain-induces-pro-tective-immunity-against-challenge-with-virulent-streptococcus-suis-serotype-2
#14
Jing Wang, Youjun Feng, Changjun Wang, Feng Zheng, Bachar Hassan, Liming Zhi, Wenjuan Li, Yi Yao, Elaine He, Shibo Jiang, Jiaqi Tang
BACKGROUND: It was previously reported in China that two recent large-scale outbreaks of Streptococcus suis serotype 2 (S. suis 2) infections in human were caused by two highly virulent S. suis 2 strains, from which a novel genomic island (GEI), associated with disease onset and progression and designated 89 K, was identified. Here, an avirulent strain, 05HAS68, was isolated from a clinically healthy pig. RESULTS: By comparing the genomes of this avirulent strain with virulent strains, it was found that massive genomic rearrangements occurred, resulting in alterations in gene expression that caused enormous single gene gain and loss...
March 14, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28274524/critical-streptococcus-suis-virulence-factors-are-they-all-really-critical
#15
REVIEW
Mariela Segura, Nahuel Fittipaldi, Cynthia Calzas, Marcelo Gottschalk
Streptococcus suis is an important swine pathogen that can be transmitted to humans by contact with diseased animals or contaminated raw pork products. This pathogen possesses a coat of capsular polysaccharide (CPS) that confers protection against the immune system. Yet, the CPS is not the only virulence factor enabling this bacterium to successfully colonize, invade, and disseminate in its host leading to severe systemic diseases such as meningitis and toxic shock-like syndrome. Indeed, recent research developments, cautiously inventoried in this review, have revealed over 100 'putative virulence factors or traits' (surface-associated or secreted components, regulatory genes or metabolic pathways), of which at least 37 have been claimed as being 'critical' for virulence...
March 6, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28257622/case-report-two-human-streptococcus-suis-infections-in-borneo-sabah-malaysia
#16
Giri Shan Rajahram, Ahneez Abdul Hameed, Jayaram Menon, Timothy William, Paul Anantharajah Tambyah, Tsin Wen Yeo
BACKGROUND: Streptococcus Suis (S.suis) is increasingly being recognised as a potentially preventable emerging zoonotic infection in humans with a global distribution. It is a major cause of meningitis especially among those in contact with pigs and has also been associated with a toxic shock syndrome. CASE PRESENTATIONS: We report the first two human cases from Sabah, Borneo, Malaysia which expands the global reach of this important pathogen. Here, we illustrate their epidemiological risk factors, clinical presentation and resulting sequelae of both patients...
March 4, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28250312/capsular-serotypes-virulence-associated-genes-and-antimicrobial-susceptibility-of-streptococcus-suis-isolates-from-pigs-in-korea
#17
Sang-Ik Oh, Albert Byungyun Jeon, Byeong-Yeal Jung, Jae-Won Byun, Marcelo Gottschalk, Aeran Kim, Jong Wan Kim, Ha-Young Kim
Streptococcus suis is an important pig pathogen with potential for human transmission. The serotype distributions and phenotypic characteristics vary over time and among regions; however, little is known about the characteristics of S. suis isolates in Korea. In this study, 240 S. suis isolates collected from pigs in Korea in 2009-2010 were serotyped by coagglutination tests, subsequently screened for three virulence-associated genes (mrp, epf and sly) and tested for antimicrobial susceptibility. As for 80 isolates, the serotypes of which were relevant to human infections, clonal complexes (CCs) were further identified by PCR...
March 1, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28220445/in-vitro-and-in-vivo-antibacterial-effect-of-nz2114-against-streptococcus-suis-type-2-infection-in-mice-peritonitis-models
#18
Jian Jiao, Ruoyu Mao, Da Teng, Xiumin Wang, Ya Hao, Na Yang, Xiao Wang, Xingjun Feng, Jianhua Wang
NZ2114 is a promising candidate for therapeutic application owing to potent activity to gram-positive bacterium such as Streptococcus pneumoniae and Staphylococcus aureus. This work is the first report to describe the in vitro and in vivo antibacterial characteristics of NZ2114 against Streptococcus suis. It exhibited strong antimicrobial activity against S. suis type 2 strains CVCC 606, CVCC 3309, and CVCC 3928 at a low minimal inhibitory concentration (MIC) of 0.03-0.06 μM. The NZ2114 killed over 99.9% of tested S...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28219415/genotyping-and-investigating-capsular-polysaccharide-synthesis-gene-loci-of-non-serotypeable-streptococcus-suis-isolated-from-diseased-pigs-in-canada
#19
Han Zheng, Xiaotong Qiu, David Roy, Mariela Segura, Pengchen Du, Jianguo Xu, Marcelo Gottschalk
Streptococcus suis (S. suis) is an important swine pathogen and an emerging zoonotic agent. Most clinical S. suis strains express capsular polysaccharides (CPS), which can be typed by antisera using the coagglutination test. In this study, 79 S. suis strains recovered from diseased pigs in Canada and which could not be typed using antisera were further characterized by capsular gene typing and sequencing. Four patterns of cps locus were observed: (1) fifteen strains were grouped into previously reported serotypes but presented several mutations in their cps loci, when compared to available data from reference strains; (2) seven strains presented a complete deletion of the cps locus, which would result in an inability to synthesize capsule; (3) forty-seven strains were classified in recently described novel cps loci (NCLs); and (4) ten strains carried novel NCLs not previously described...
February 20, 2017: Veterinary Research
https://www.readbyqxmd.com/read/28212285/transcriptomic-analysis-reveals-selective-metabolic-adaptation-of-streptococcus-suis-to-porcine-blood-and-cerebrospinal-fluid
#20
Anna Koczula, Michael Jarek, Christian Visscher, Peter Valentin-Weigand, Ralph Goethe, Jörg Willenborg
Streptococcus suis is a zoonotic pathogen that can cause severe pathologies such as septicemia and meningitis in its natural porcine host as well as in humans. Establishment of disease requires not only virulence of the infecting strain but also an appropriate metabolic activity of the pathogen in its host environment. However, it is yet largely unknown how the streptococcal metabolism adapts to the different host niches encountered during infection. Our previous isotopologue profiling studies on S. suis grown in porcine blood and cerebrospinal fluid (CSF) revealed conserved activities of central carbon metabolism in both body fluids...
February 15, 2017: Pathogens
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