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https://www.readbyqxmd.com/read/29317512/streptococcus-pneumoniae-modulates-staphylococcus-aureus-biofilm-dispersion-and-the-transition-from-colonization-to-invasive-disease
#1
Ryan M Reddinger, Nicole R Luke-Marshall, Shauna L Sauberan, Anders P Hakansson, Anthony A Campagnari
Streptococcus pneumoniae and Staphylococcus aureus are ubiquitous upper respiratory opportunistic pathogens. Individually, these Gram-positive microbes are two of the most common causative agents of secondary bacterial pneumonia following influenza A virus infection, and they constitute a significant source of morbidity and mortality. Since the introduction of the pneumococcal conjugate vaccine, rates of cocolonization with both of these bacterial species have increased, despite the traditional view that they are antagonistic and mutually exclusive...
January 9, 2018: MBio
https://www.readbyqxmd.com/read/29315379/anti-biofilm-activity-of-antibody-directed-against-surface-antigen-cr3-rp-comparison-of-candida-albicans-and-candida-dubliniensis
#2
Jaroslava Chupácová, Elisa Borghi, Giulia Morace, Agata Los, Helena Bujdáková
Candida albicans and Candida dubliniensis are related yeasts that differ in the expression of virulence-associated proteins involved in adherence and biofilm development. CR3-RP (complement receptor 3-related protein) is one of the surface antigens expressed by Candida species. The main objective of this research was to elucidate the effect of the polyclonal anti-CR3-RP antibody (Ab) on adherence and the biofilm formed by C. albicans SC5314 and C. dubliniensis CBS 7987 and 2 clinical isolates in vitro, ex vivo, and in vivo...
January 5, 2018: Pathogens and Disease
https://www.readbyqxmd.com/read/29229735/oral-application-of-recombinant-bacillus-subtilis-spores-to-dogs-results-in-a-humoral-response-against-specific-echinococcus-granulosus-paramyosin-and-tropomyosin-antigens
#3
Cédric M Vogt, Maria Teresa Armúa-Fernández, Kurt Tobler, Monika Hilbe, Claudio Aguilar, Mathias Ackermann, Peter Deplazes, Catherine Eichwald
Bacillus subtilis is known as an endospore- and biofilm-forming bacterium with probiotic properties. We have recently developed a method for displaying heterologous proteins on the surface of B. subtilis biofilms by introducing the coding sequences of the protein of interest into the bacterial genome to generate a fusion protein linked to the C-terminus of the biofilm matrix protein TasA. Although B. subtilis is a regular component of the gut microflora, we constructed a series of recombinant B. subtilis strains that were tested for their ability to immunize dogs following oral application of the spores...
December 11, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29223801/the-external-face-of-candida-albicans-a-proteomic-view-of-the-cell-surface-and-the-extracellular-environment
#4
Ana Gil-Bona, Ahinara Amador-García, Concha Gil, Lucia Monteoliva
The cell surface and secreted proteins are the initial points of contact between Candida albicans and the host. Improvements in protein extraction approaches and mass spectrometers have allowed researchers to obtain a comprehensive knowledge of these external subproteomes. In this paper, we review the published proteomic studies that have examined C. albicans extracellular proteins, including the cell surface proteins or surfome and the secreted proteins or secretome. The use of different approaches to isolate cell wall and cell surface proteins, such as fractionation approaches or cell shaving, have resulted in different outcomes...
December 6, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/29200185/early-vaccine-type-pneumococcal-acute-otitis-media-does-not-predispose-to-subsequent-otitis-when-compared-to-early-acute-otitis-media-due-to-other-bacterial-etiology
#5
Arto A Palmu, Mika Lahdenkari
BACKGROUND: Prevention of acute otitis media (AOM), and especially recurrence and biofilm formation, by pneumococcal conjugate vaccines (PCV) has been hypothesized to be due to prevention of early episodes triggering the vicious cycle. We tested the specific role of vaccine-type pneumococcal AOM in this hypothesis. METHODS: In the phase III randomized, double-blind FinOM Vaccine Trial conducted in 1995-99 children received PCV7 or hepatitis B vaccine as control at 2/4/6/12 months of age and were followed for AOM...
December 1, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/29184097/csl2-a-novel-chimeric-bacteriophage-lysin-to-fight-infections-caused-by-streptococcus-suis-an-emerging-zoonotic-pathogen
#6
Roberto Vázquez, Mirian Domenech, Manuel Iglesias-Bexiga, Margarita Menéndez, Pedro García
Streptococcus suis is a Gram-positive bacterium that infects humans and various animals, causing human mortality rates ranging from 5 to 20%, as well as important losses for the swine industry. In addition, there is no effective vaccine for S. suis and isolates with increasing antibiotic multiresistance are emerging worldwide. Facing this situation, wild type or engineered bacteriophage lysins constitute a promising alternative to conventional antibiotics. In this study, we have constructed a new chimeric lysin, Csl2, by fusing the catalytic domain of Cpl-7 lysozyme to the CW_7 repeats of LySMP lysin from an S...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29164393/bordetella-pertussis-virulence-factors-in-the-continuing-evolution-of-whooping-cough-vaccines-for-improved-performance
#7
REVIEW
Dorji Dorji, Frits Mooi, Osvaldo Yantorno, Rajendar Deora, Ross M Graham, Trilochan K Mukkur
Despite high vaccine coverage, whooping cough caused by Bordetella pertussis remains one of the most common vaccine-preventable diseases worldwide. Introduction of whole-cell pertussis (wP) vaccines in the 1940s and acellular pertussis (aP) vaccines in 1990s reduced the mortality due to pertussis. Despite induction of both antibody and cell-mediated immune (CMI) responses by aP and wP vaccines, there has been resurgence of pertussis in many countries in recent years. Possible reasons hypothesised for resurgence have ranged from incompliance with the recommended vaccination programmes with the currently used aP vaccine to infection with a resurged clinical isolates characterised by mutations in the virulence factors, resulting in antigenic divergence with vaccine strain, and increased production of pertussis toxin, resulting in dampening of immune responses...
November 21, 2017: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/29164072/a-new-strain-collection-for-improved-expression-of-outer-membrane-proteins
#8
Ina Meuskens, Marcin Michalik, Nandini Chauhan, Dirk Linke, Jack C Leo
Almost all integral membrane proteins found in the outer membranes of Gram-negative bacteria belong to the transmembrane β-barrel family. These proteins are not only important for nutrient uptake and homeostasis, but are also involved in such processes as adhesion, protein secretion, biofilm formation, and virulence. As surface exposed molecules, outer membrane β-barrel proteins are also potential drug and vaccine targets. High production levels of heterologously expressed proteins are desirable for biochemical and especially structural studies, but over-expression and subsequent purification of membrane proteins, including outer membrane proteins, can be challenging...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29145795/use-of-immunohistochemistry-to-demonstrate-in-vivo-expression-of-the-burkholderia-mallei-virulence-factor-bpab-during-experimental-glanders
#9
Shawn M Zimmerman, Mackenzie E Long, Jeremy S Dyke, Tomislav P Jelesijevic, Frank Michel, Eric R Lafontaine, Robert J Hogan
Burkholderia mallei causes the highly contagious and debilitating zoonosis glanders, which infects via inhalation or percutaneous inoculation and often culminates in life-threatening pneumonia and sepsis. In humans, glanders is difficult to diagnose and requires prolonged antibiotic therapy with low success rates. No vaccine exists to protect against B. mallei, and there is concern regarding its use as a bioweapon. The authors previously identified the protein BpaB as a potential target for devising therapies due to its role in adherence to host cells and the formation of biofilms in vitro and its contribution to pathogenicity in a mouse model of glanders...
January 1, 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/29110751/actinobacillus-pleuropneumoniae-biofilms-role-in-pathogenicity-and-potential-impact-for-vaccination-development
#10
Skander Hathroubi, Abraham Loera-Muro, Alma L Guerrero-Barrera, Yannick D N Tremblay, Mario Jacques
Actinobacillus pleuropneumoniae is a Gram-negative bacterium that belongs to the family Pasteurellaceae. It is the causative agent of porcine pleuropneumonia, a highly contagious respiratory disease that is responsible for major economic losses in the global pork industry. The disease may present itself as a chronic or an acute infection characterized by severe pathology, including hemorrhage, fibrinous and necrotic lung lesions, and, in the worst cases, rapid death. A. pleuropneumoniae is transmitted via aerosol route, direct contact with infected pigs, and by the farm environment...
November 7, 2017: Animal Health Research Reviews
https://www.readbyqxmd.com/read/28979250/evaluation-of-recombinant-multi-epitope-outer-membrane-protein-based-klebsiella-pneumoniae-subunit-vaccine-in-mouse-model
#11
Litty Babu, Siva R Uppalapati, Murali H Sripathy, Prakash N Reddy
Safety and protective efficacy of recombinant multi-epitope subunit vaccine (r-AK36) was evaluated in a mouse model. Recombinant AK36 protein comprised of immunodominant antigens from outer membrane proteins (Omp's) of Klebsiella pneumoniae namely OmpA and OmpK36. r-AK36 was highly immunogenic and the hyperimmune sera reacted strongly with native OmpA and OmpK36 proteins from different K. pneumoniae strains. Hyperimmune sera showed cross-reactivity with Omp's of other Gram-negative organisms. Humoral responses showed a Th2-type polarized immune response with IgG1 being the predominant antibody isotype...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28932816/a-quorum-sensing-system-that-regulates-streptococcus-pneumoniae-biofilm-formation-and-surface-polysaccharide-production
#12
Roger Junges, Gabriela Salvadori, Sudhanshu Shekhar, Heidi A Åmdal, Jimstan N Periselneris, Tsute Chen, Jeremy S Brown, Fernanda C Petersen
Despite vaccines, Streptococcus pneumoniae kills more than a million people yearly. Thus, understanding how pneumococci transition from commensals to pathogens is particularly relevant. Quorum sensing regulates collective behaviors and thus represents a potential driver of commensal-to-pathogen transitions. Rgg/small hydrophobic peptide (SHP) quorum-sensing systems are widespread in streptococci, yet they remain largely uncharacterized in S. pneumoniae. Using directional transcriptome sequencing, we show that the S...
September 2017: MSphere
https://www.readbyqxmd.com/read/28893915/hyperbiofilm-formation-by-bordetella-pertussis-strains-correlates-with-enhanced-virulence-traits
#13
Natalia Cattelan, Jamie Jennings-Gee, Purnima Dubey, Osvaldo M Yantorno, Rajendar Deora
Pertussis or whooping cough caused by the obligate human pathogen Bordetella pertussis is undergoing a world-wide resurgence. Majority of studies with this pathogen are conducted with laboratory-adapted strains which may not be representative of the species as a whole. Biofilm formation by B. pertussis plays an important role in its pathogenesis. We conducted a side-by side comparison of the biofilm forming ability of the prototype laboratory strains with currently circulating isolates from two countries with different vaccination programs...
September 11, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28890886/development-of-a-novel-anti-adhesive-vaccine-against-pseudomonasaeruginosa-targeting-the-c-terminal-disulfide-loop-of-the-pilin-protein
#14
Sobhan Faezi, Ahmad Reza Bahrmand, Mehdi Mahdavi, Seyed Davar Siadat, Iraj Nikokar, Soroush Sardari
Type IV pili (T4P) are major virulence factors of Pseudomonas aeruginosa (P. aeruginosa) that are associated with primary adhesion, biofilm formation and twitching motility. This study focuses on the introduction of a novel biologically active subunit vaccine derived from the disulfide loop (DSL) of P. aeruginosa pilin. We investigated the expression of the novel PilA in-frame with pET26b vector, which contains three domains, that each domain contains three tandem repeats. The flexible (GGGGS) and (GGGGS)3 linkers were linked between the three tandem repeats and each pilA domain, respectively...
2017: International Journal of Molecular and Cellular Medicine
https://www.readbyqxmd.com/read/28859312/phase-variation-of-dna-methyltransferases-and-the-regulation-of-virulence-and-immune-evasion-in-the-pathogenic-neisseria
#15
Kate L Seib, Freda E-C Jen, Adeana L Scott, Aimee Tan, Michael P Jennings
The pathogenic Neisseria provide textbook examples of phase variation: the high frequency, random and reversible switching of gene expression. Typically, phase variable gene expression is observed in genes required for the expression of surface proteins and carbohydrate structures. All Neisseria gonorrhoeae and N. meningitidis strains also express phase variable DNA methyltransferases that are components of DNA restriction-modification systems. Phase variation of these DNA methyltransferases (Mod) alters global DNA methylation patterns...
August 31, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28853985/a-moraxella-catarrhalis-vaccine-to-protect-against-otitis-media-and-exacerbations-of-copd-an-update-on-current-progress-and-challenges
#16
Antonia C Perez, Timothy F Murphy
Moraxella catarrhalis is a major cause of morbidity and mortality worldwide, especially causing otitis media in young children and exacerbations of chronic obstructive pulmonary disease in adults. This pathogen uses several virulence mechanisms to colonize and survive in its host, including adherence and invasion of host cells, formation of polymicrobial biofilms with other bacterial pathogens, and production of β-lactamase. Given the global impact of otitis media and COPD, an effective vaccine to prevent M...
October 3, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28771632/refinement-of-immunizing-antigens-to-produce-functional-blocking-antibodies-against-the-ania-nitrite-reductase-of-neisseria-gonorrhoeae
#17
Lucy K Shewell, Freda E-C Jen, Michael P Jennings
The emergence of multi-drug resistant Neisseria gonorrhoeae has generated an urgent need for novel therapies or a vaccine to prevent gonococcal disease. In this study we investigate the potential of targeting the surface exposed nitrite reductase, AniA, to block activity by producing functional blocking antibodies. AniA activity is essential for anaerobic growth and biofilm formation of N. gonorrhoeae and functional blocking antibodies may prevent colonisation and disease. Seven peptides covering regions adjacent to the active site were designed based on the AniA structure...
2017: PloS One
https://www.readbyqxmd.com/read/28638106/protective-efficacy-of-the-trivalent-pseudomonas-aeruginosa-vaccine-candidate-pcrv-opri-hcp1-in-murine-pneumonia-and-burn-models
#18
Feng Yang, Jiang Gu, Liuyang Yang, Chen Gao, Haiming Jing, Ying Wang, Hao Zeng, Quanming Zou, Fenglin Lv, Jinyong Zhang
Pseudomonas aeruginosa is a formidable pathogen that is responsible for a diverse spectrum of human infectious diseases, resulting in considerable annual mortality rates. Because of biofilm formation and its ability of rapidly acquires of resistance to many antibiotics, P. aeruginosa related infections are difficult to treat, and therefore, developing an effective vaccine is the most promising method for combating infection. In the present study, we designed a novel trivalent vaccine, PcrV28-294-OprI25-83-Hcp11-162 (POH), and evaluated its protective efficacy in murine pneumonia and burn models...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28637806/the-pneumococcal-serotype-15c-capsule-is-partially-o-acetylated-and-allows-for-limited-evasion-of-23-valent-pneumococcal-polysaccharide-vaccine-elicited-anti-serotype-15b-antibodies
#19
Brady L Spencer, Anukul T Shenoy, Carlos J Orihuela, Moon H Nahm
As a species, Streptococcus pneumoniae (the pneumococcus) utilizes a diverse array of capsular polysaccharides to evade the host. In contrast to large variations in sugar composition and linkage formation, O-acetylation is a subtle capsular modification that nonetheless has a large impact on capsular shielding and recognition of the capsule by vaccine-elicited antibodies. Serotype 15B, which is included in the 23-valent pneumococcal polysaccharide vaccine (PPV23), carries the putative O-acetyltransferase gene wciZ The coding sequence of wciZ contains eight consecutive TA repeats [(TA)8]...
August 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28631399/into-the-storm-chasing-the-opportunistic-pathogen-staphylococcus-aureus-from-skin-colonisation-to-life-threatening-infections
#20
REVIEW
James P O'Gara
Colonisation of the human skin by Staphylococcus aureus is a precursor for a variety of infections ranging from boils to sepsis and pneumonia. The rapid emergence of methicillin-resistant S. aureus following the clinical introduction of this antimicrobial drug and reports of resistance to all currently used anti-staphylococcal drugs has added to its formidable reputation. S. aureus survival on the skin and in vivo virulence is underpinned by a remarkable environmental adaptability, made possible by highly orchestrated regulation of gene expression and a capacity to undertake genome remodelling...
October 2017: Environmental Microbiology
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