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https://www.readbyqxmd.com/read/29145795/use-of-immunohistochemistry-to-demonstrate-in-vivo-expression-of-the-burkholderia-mallei-virulence-factor-bpab-during-experimental-glanders
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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...
June 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28616365/streptococcus-pneumoniae-otitis-media-pathogenesis-and-how-it-informs-our-understanding-of-vaccine-strategies
#13
REVIEW
Caroline Bergenfelz, Anders P Hakansson
PURPOSE OF REVIEW: This study aimed to review the literature regarding the mechanisms of transition from asymptomatic colonization to induction of otitis media and how the insight into the pathogenesis of otitis media has the potential to help design future otitis media-directed vaccines. RECENT FINDINGS: Respiratory viruses have long been shown to predispose individuals to bacterial respiratory infections, such as otitis media. Recent information suggests that Streptococcus pneumoniae, which colonize the nasopharynx asymptomatically, can sense potentially "threatening" changes in the nasopharyngeal environment caused by virus infection by upregulating specific sets of genes involved in biofilm release, dissemination from the nasopharynx to other sites, and protection against the host immune system...
2017: Current Otorhinolaryngology Reports
https://www.readbyqxmd.com/read/28604268/mucosal-immunization-with-a-flagellin-adjuvanted-hgp44-vaccine-enhances-protective-immune-responses-in-a-murine-porphyromonas-gingivalis-infection-model
#14
Sao Puth, Seol Hee Hong, Mi Jin Park, Hye Hwa Lee, Youn Suhk Lee, Kwangjoon Jeong, In-Chol Kang, Jeong Tae Koh, Byounggon Moon, Sang Chul Park, Joon Haeng Rhee, Shee Eun Lee
Chronic periodontitis is caused by interactions between the oral polymicrobial community and host factors. Periodontal diseases are associated with dysbiotic shift in oral microbiota. Vaccination against periodontopathic bacteria could be a fundamental therapeutic to modulate polymicrobial biofilms. Because oral cavity is the site of periodontopathic bacterial colonization, mucosal vaccines should provide better protection than vaccines administered systemically. We previously reported that bacterial flagellin is an excellent mucosal adjuvant...
June 12, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28586394/polyamine-transporter-potabcd-is-required-for-virulence-of-encapsulated-but-not-nonencapsulated-streptococcus-pneumoniae
#15
Haley R Pipkins, Jessica L Bradshaw, Lance E Keller, Edwin Swiatlo, Larry S McDaniel
Streptococcus pneumoniae is commonly found in the human nasopharynx and is the causative agent of multiple diseases. Since invasive pneumococcal infections are associated with encapsulated pneumococci, the capsular polysaccharide is the target of licensed pneumococcal vaccines. However, there is an increasing distribution of non-vaccine serotypes, as well as nonencapsulated S. pneumoniae (NESp). Both encapsulated and nonencapsulated pneumococci possess the polyamine oligo-transport operon (potABCD). Previous research has shown inactivation of the pot operon in encapsulated pneumococci alters protein expression and leads to a significant reduction in pneumococcal murine colonization, but the role of the pot operon in NESp is unknown...
2017: PloS One
https://www.readbyqxmd.com/read/28576759/competitive-dominance-within-biofilm-consortia-regulates-the-relative-distribution-of-pneumococcal-nasopharyngeal-density
#16
Xueqing Wu, Nathan T Jacobs, Catherine Bozio, Preston Palm, Santiago M Lattar, Christiane R Hanke, David M Watson, Fuminori Sakai, Bruce R Levin, Keith P Klugman, Jorge E Vidal
Streptococcus pneumoniae is a main cause of child mortality worldwide, but strains also asymptomatically colonize the upper airways of most children and form biofilms. Recent studies have demonstrated that ∼50% of colonized children carry at least two different serotypes (i.e., strains) in the nasopharynx; however, studies of how strains coexist are limited. In this work, we investigated the physiological, genetic, and ecological requirements for the relative distribution of densities, and spatial localization, of pneumococcal strains within biofilm consortia...
August 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28561911/biofilm-formation-and-virulence-factor-analysis-of-staphylococcus-aureus-isolates-collected-from-ovine-mastitis
#17
E Azara, C Longheu, G Sanna, S Tola
AIMS: To perform a phenotypic and genotypic characterization of 258 Staphylococcus aureus isolates from clinical ovine mastitis and used for the preparation of inactivated autogenous vaccines. METHODS AND RESULTS: The potential for biofilm production was determined by phenotypic test of Congo Red Agar (CRA) and by PCR for the detection of icaA/D genes. Isolates were also screened by PCR for the presence of enterotoxins (sea, seb, sec, sed and see), toxic shock syndrome toxin (tsst), leukotoxins (lukD-E, lukM and lukPV83), haemolysins (hly-β and hly-γ), autolysin (atlA) genes and encoding microbial surface components recognizing adhesive matrix molecules (MSCRAMMs: clfA, clfB, fnbA, fnbB, bbp, cna, eno, fib, epbs, sdrC, sdrD and SdrE)...
May 31, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28438972/position-of-o-acetylation-within-the-capsular-repeat-unit-impacts-the-biological-properties-of-pneumococcal-serotypes-33a-and-33f
#18
Brady L Spencer, Jamil S Saad, Anukul T Shenoy, Carlos J Orihuela, Moon H Nahm
Streptococcus pneumoniae (pneumococcus) produces many capsule types that differ in their abilities to evade host immune recognition. To explain these serotype-dependent protective capacities, many studies have investigated capsular thickness or the interaction of the capsule with complement proteins, but the effects of small chemical modifications of the capsule on its function have not been studied. One small chemical modification found frequently among pneumococcal capsules is O-acetylation. Pneumococcal serotype 33A has two membrane-bound O-acetyltransferase genes, wciG and wcjE A 33A wcjE-deficient variant, 33F, occurs naturally and is increasing in prevalence in the wake of widespread conjugate vaccine use, but no wciG-deficient variants have been reported...
July 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28381402/transcutaneous-immunization-with-a-band-aid-prevents-experimental-otitis-media-in-a-polymicrobial-model
#19
Laura A Novotny, John D Clements, Steven D Goodman, Lauren O Bakaletz
Otitis media (OM) is a common pediatric disease, and nontypeable Haemophilus influenzae (NTHI) is the predominant pathogen in chronic OM, recurrent OM, and OM associated with treatment failure. OM is also a polymicrobial disease, wherein an upper respiratory tract viral infection predisposes to ascension of NTHI from the nasopharynx, the site of colonization, to the normally sterile middle ear, resulting in disease. Using a clinically relevant viral-bacterial coinfection model of NTHI-induced OM, we performed transcutaneous immunization (TCI) via a band-aid delivery system to administer each of three promising NTHI vaccine candidates derived from bacterial adhesive proteins and biofilm mediators: recombinant soluble PilA (rsPilA), chimV4, and integration host factor...
June 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28167935/antifungal-therapy-new-advances-in-the-understanding-and-treatment-of-mycosis
#20
REVIEW
Liliana Scorzoni, Ana C A de Paula E Silva, Caroline M Marcos, Patrícia A Assato, Wanessa C M A de Melo, Haroldo C de Oliveira, Caroline B Costa-Orlandi, Maria J S Mendes-Giannini, Ana M Fusco-Almeida
The high rates of morbidity and mortality caused by fungal infections are associated with the current limited antifungal arsenal and the high toxicity of the compounds. Additionally, identifying novel drug targets is challenging because there are many similarities between fungal and human cells. The most common antifungal targets include fungal RNA synthesis and cell wall and membrane components, though new antifungal targets are being investigated. Nonetheless, fungi have developed resistance mechanisms, such as overexpression of efflux pump proteins and biofilm formation, emphasizing the importance of understanding these mechanisms...
2017: Frontiers in Microbiology
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