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Streptococcus suis

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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
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
https://www.readbyqxmd.com/read/28194111/syringa-oblata-lindl-aqueous-extract-is-a-potential-biofilm-inhibitor-in-s-suis
#12
Jingwen Bai, Yanbei Yang, Shuai Wang, Lingfei Gao, Jianqing Chen, Yongzhi Ren, Wenya Ding, Ishfaq Muhammad, Yanhua Li
Streptococcus suis (S. suis) is a zoonotic pathogen that causes severe disease symptoms in pigs and humans. Syringa oblata Lindl. distributed in the middle latitudes of Eurasia and North America were proved as the most development potential of Chinese Medicine. In this study, biofilm formation by S. suis decreased after growth with 1/2 MIC, 1/4 MIC, or 1/8 MIC of Syringa oblata Lindl. aqueous extract and rutin. Scanning electron microscopy analysis revealed the potential effect of Syringa oblata Lindl. aqueous extract and rutin against biofilm formation by S...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28191919/lysine-tryptophan-crosslinked-peptides-produced-by-radical-sam-enzymes-in-pathogenic-streptococci
#13
Kelsey R Schramma, Mohammad R Seyedsayamdost
Macrocycles represent a common structural framework in many naturally occurring peptides. Several strategies exist for macrocyclization, and the enzymes that incorporate them are of great interest, as they enhance our repertoire for creating complex molecules. We recently discovered a new peptide cyclization reaction involving a crosslink between the side chains of lysine and tryptophan that is installed by a radical SAM enzyme. Herein, we characterize relatives of this metalloenzyme from the pathogens Streptococcus agalactiae and Streptococcus suis...
March 3, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28166707/isolation-and-partial-characterization-of-streptococcus-suis-from-clinical-cases-in-cattle
#14
Ogi Okwumabua, Hanna Peterson, Hui-Min Hsu, Phil Bochsler, Melissa Behr
Sixteen isolates of gram-positive, coccoid bacteria were obtained from clinical cases of diverse conditions in cattle and identified as Streptococcus suis using 16S ribosomal DNA gene sequencing and other bacterial identification methods. None of the isolates could be assigned to any of the known S. suis capsular types. Virulence-associated gene profiling that targeted muramidase-released protein, extracellular protein factor, suilysin, 89-kb pathogenicity island, and arginine deiminase ( arcA) genes were negative except for 1 isolate that was arcA positive...
March 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28164787/factor-h-specifically-capture-novel-factor-h-binding-proteins-of-streptococcus-suis-and-contribute-to-the-virulence-of-the-bacteria
#15
Quan Li, Caifeng Ma, Yang Fu, Yanan He, Yanfei Yu, Dechao Du, Huochun Yao, Chengping Lu, Wei Zhang
Factor H (FH), a regulatory protein of the complement system, can bind specifically to factor H-binding proteins (FHBPs) of Streptococcus suis serotype 2 (SS2), which contribute to evasion of host innate immune defenses. In the present study, we aimed to identify novel FHBPs and characterize the biological functions of FH in SS2 pathogenesis. Here, a method that combined proteomics and Far-western blotting was developed to identify the surface FHBPs of SS2. With this method, fourteen potential novel FHBPs were identified among SS2 surface proteins...
March 2017: Microbiological Research
https://www.readbyqxmd.com/read/28131383/transcutaneous-immunization-of-streptococcus-suis-bacterin-using-dissolving-microneedles
#16
Kai-Jen Hsueh, Mei-Chin Chen, Li-Ting Cheng, Jai-Wei Lee, Wen-Bin Chung, Chun-Yen Chu
Vaccine delivery using microneedle (MN) patches is an easy, safe and painless alternative to traditional needle injections. In this study, we examined whether MN patches can enhance the efficacy of a Streptococcus suis serotype 2 (S. suis 2) vaccine in a mouse model. Results showed that MNs can reach 200-250μm into the skin, a depth beneficial for targeted delivery of antigens to antigen-presenting cells in the epidermis and dermis. Vaccination with prime-boost of MN induced higher levels of IgG2a antibody titer, T cell proliferation, and TH1 cytokines (IFN-γ and IL-12) as compared to intramuscular (IM) injection...
February 2017: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/28125697/usefulness-of-maldi-tof-ms-as-a-diagnostic-tool-for-the-identification-of-streptococcus-species-recovered-from-clinical-specimens-of-pigs
#17
Marta Pérez-Sancho, Ana I Vela, Teresa García-Seco, Sergio González, Lucas Domínguez, Jose Francisco Fernández-Garayzábal
The application of MALDI-TOF MS for identifying streptococcal isolates recovered from clinical specimens of diseased pigs was evaluated. For this proposal, the MALDI BDAL Database (Bruker Daltoniks, Germany) was supplemented with the main spectrum profiles (MSP) of the reference strains of S. porci, S. porcorum and S. plurextorum associated with pneumonia and septicemia. Although these three species showed similar MALDI profiles, several peaks were recognized that can be useful for their differentiation: S...
2017: PloS One
https://www.readbyqxmd.com/read/28110777/streptococcus-suis-small-rna-rss04-contributes-to-the-induction-of-meningitis-by-regulating-capsule-synthesis-and-by-inducing-biofilm-formation-in-a-mouse-infection-model
#18
Genhui Xiao, Huanyu Tang, Shouming Zhang, Haiyan Ren, Jiao Dai, Liying Lai, Chengping Lu, Huochun Yao, Hongjie Fan, Zongfu Wu
Streptococcus suis (SS) is an important pathogen for pigs, and it is also considered as a zoonotic agent for humans. Meningitis is one of the most common features of the infection caused by SS, but little is known about the mechanisms of SS meningitis. Recent studies have revealed that small RNAs (sRNAs) have emerged as key regulators of the virulence in several bacteria. In the previous study, we reported that SS sRNA rss04 was up-regulated in pig cerebrospinal fluid and contributes to SS virulence in a zebrafish infection model...
February 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28104658/draft-genome-sequence-of-hypervirulent-and-vaccine-candidate-streptococcus-suis-strain-sc19
#19
Lin Teng, Xingxing Dong, Yang Zhou, Zhiwei Li, Limei Deng, Huanchun Chen, Xiaohong Wang, Jinquan Li
Streptococcus suis, a zoonotic bacterium found primarily in pigs, has been recognized recently as an emerging pathogen of humans. Herein, we describe the genome of Streptococcus suis strain SC19, a hypervirulent and vaccine candidate strain isolated from a pig amid the 2005 outbreak in China.
January 19, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28104185/causes-and-outcomes-of-sepsis-in-southeast-asia-a-multinational-multicentre-cross-sectional-study
#20
(no author information available yet)
BACKGROUND: Improved understanding of pathogens that cause sepsis would aid management and antimicrobial selection. In this study, we aimed to identify the causative pathogens of sepsis in southeast Asia. METHODS: In this multinational multicentre cross-sectional study of community-acquired sepsis and severe sepsis, we prospectively recruited children (age ≥30 days and <18 years) and adults (age ≥18 years) at 13 public hospitals in Indonesia (n=3), Thailand (n=4), and Vietnam (n=6)...
February 2017: Lancet Global Health
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