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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
#1
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...
April 24, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28381402/transcutaneous-immunization-with-a-bandaid-prevents-experimental-otitis-media-in-a-polymicrobial-model
#2
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 co-infection model of NTHI-induced OM, we performed transcutaneous immunization (TCI) via a bandaid delivery system to administer each of three promising NTHI vaccine candidates derived from bacterial adhesive proteins and biofilm mediators: rsPilA, chimV4 and integration host factor...
April 5, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28167935/antifungal-therapy-new-advances-in-the-understanding-and-treatment-of-mycosis
#3
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
https://www.readbyqxmd.com/read/28096183/pneumococcal-neuraminidase-a-nana-promotes-biofilm-formation-and-synergizes-with-influenza-a-virus-in-nasal-colonization-and-middle-ear-infection
#4
John T Wren, Lance K Blevins, Bing Pang, Ankita Basu Roy, Melissa B Oliver, Jennifer L Reimche, Jessie E Wozniak, Martha A Alexander-Miller, W Edward Swords
Even in the vaccine era, Streptococcus pneumoniae (the pneumococcus) remains a leading cause of otitis media, a significant public health burden, in large part because of the high prevalence of nasal colonization with the pneumococcus in children. The primary pneumococcal neuraminidase, NanA, which is a sialidase that catalyzes the cleavage of terminal sialic acids from host glycoconjugates, is involved in both of these processes. Coinfection with influenza A virus, which also expresses a neuraminidase, exacerbates nasal colonization and disease by S...
April 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28070572/electrostatic-layer-by-layer-construction-of-fibrous-tmv-biofilms
#5
Brylee David B Tiu, Daniel L Kernan, Sicily B Tiu, Amy M Wen, Yi Zheng, Jonathan K Pokorski, Rigoberto C Advincula, Nicole F Steinmetz
As nature's choice in designing complex architectures, the bottom-up assembly of nanoscale building blocks offers unique solutions in achieving more complex and smaller morphologies with wide-ranging applications in medicine, energy, and materials science as compared to top-down manufacturing. In this work, we employ charged tobacco mosaic virus (TMV-wt and TMV-lys) nanoparticles in constructing multilayered fibrous networks via electrostatic layer-by-layer (LbL) deposition. In neutral aqueous media, TMV-wt assumes an anionic surface charge...
January 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/27927053/future-therapies-targeted-towards-eliminating-candida-biofilms-and-associated-infections
#6
H M H N Bandara, V H Matsubara, L P Samaranayake
Candida species are common human commensals and cause either superficial or invasive opportunistic infections. The biofilm form of candida as opposed to its suspended, planktonic form, is predominantly associated with these infections. Alternative or adjunctive therapies are urgently needed to manage Candida infections as the currently available short arsenal of antifungal drugs has been compromised due to their systemic toxicity, cross-reactivity with other drugs, and above all, by the emergence of drug-resistant Candida species due to irrational drug use...
March 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/27919900/n-acetyl-l-cysteine-and-cysteamine-as-new-strategies-against-mixed-biofilms-of-nonencapsulated-streptococcus-pneumoniae-and-nontypeable-haemophilus-influenzae
#7
Mirian Domenech, Ernesto García
Acute otitis media, a polymicrobial disease of the middle ear cavity of children, is a significant public health problem worldwide. It is most frequently caused by encapsulated Streptococcus pneumoniae and nontypeable Haemophilus influenzae, although the widespread use of pneumococcal conjugate vaccines is apparently producing an increase in the carriage of nonencapsulated S. pneumoniae Frequently, pneumococci and H. influenzae live together in the human nasopharynx, forming a self-produced biofilm. Biofilms present a global medical challenge since the inherent antibiotic resistance of their producers demands the use of large doses of antibiotics over prolonged periods...
February 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27679782/adjuvant-role-of-pseudomonas-flagellin-for-acinetobacter-baumannii-biofilm-associated-protein
#8
Mozhgan Derakhshan Sefidi, Iraj Rasooli, Parviz Owlia, Daryush Talei, Shakiba Darvish Alipour Astaneh, Shahram Nazarian
AIM: To study immunogenicity of Pseudomonas N terminal flagellin as an adjuvant for Acinetobacter baumannii (A. baumannii) biofilm associated protein (Bap). METHODS: The N terminal flagellin gene was amplified. The pET28a (+) and polymerase chain reaction products were digested with HindIII and EcoR I. The ligation of N terminal flagellin into pET28a (‏+) was performed using T4 DNA ligase and was then transformed into Escherichia coli BL21 (DE3) as a suitable expression host...
September 26, 2016: World Journal of Methodology
https://www.readbyqxmd.com/read/27669900/biofilm-forming-potential-and-antimicrobial-susceptibility-of-newly-emerged-western-australian-bordetella-pertussis-clinical-isolates
#9
Dorji Dorji, Ross M Graham, Peter Richmond, Anthony Keil, Trilochan K Mukkur
Whooping cough caused by Bordetella pertussis is increasing in several countries despite high vaccine coverage. One potential reason for the resurgence is the emergence of genetic variants of the bacterium. Biofilm formation has recently been associated with the pathogenesis of B. pertussis. Biofilm formation of 21 Western Australian B. pertussis clinical isolates was investigated. All isolates formed thicker biofilms than the reference vaccine strain Tohama I while retaining susceptibility to ampicillin, erythromycin, azithromycin and streptomycin...
October 2016: Biofouling
https://www.readbyqxmd.com/read/27629411/combining-in-vitro-protein-detection-and-in-vivo-antibody-detection-identifies-potential-vaccine-targets-against-staphylococcus-aureus-during-osteomyelitis
#10
P Martijn den Reijer, Marjan Sandker, Susan V Snijders, Mehri Tavakol, Antoni P A Hendrickx, Willem J B van Wamel
Currently, little is known about the in vivo human immune response against Staphylococcus aureus during a biofilm-associated infection, such as osteomyelitis, and how this relates to protein production in biofilms in vitro. Therefore, we characterized IgG responses in 10 patients with chronic osteomyelitis against 50 proteins of S. aureus, analyzed the presence of these proteins in biofilms of the infecting isolates on polystyrene (PS) and human bone in vitro, and explored the relation between in vivo and in vitro data...
February 2017: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/27546876/the-bcg%C3%AE-bcg1419c-strain-which-produces-more-pellicle-in-vitro-improves-control-of-chronic-tuberculosis-in-vivo
#11
César Pedroza-Roldán, Carolina Guapillo, Jorge Barrios-Payán, Dulce Mata-Espinosa, Michel de Jesús Aceves-Sánchez, Brenda Marquina-Castillo, Rogelio Hernández-Pando, Mario Alberto Flores-Valdez
Mycobacterium tuberculosis (Mtb) has been a threat to humans since ancient times, and it is the main causative agent of tuberculosis (TB). Until today, the only licensed vaccine against Mtb is the live attenuated M. bovis Bacillus Calmette-Guérin (BCG), which has variable levels of protection against the pulmonary form of infection. The quest for a new vaccine is a priority given the rise of multidrug-resistant Mtb around the world, as well as the tremendous burden imposed by latent TB. The objective of this study was to evaluate the immunogenicity and capacity of protection of a modified BCG strain (BCGΔBCG1419c) lacking the c-di-GMP phosphodiesterase gene BCG1419c, in diverse mice models...
September 14, 2016: Vaccine
https://www.readbyqxmd.com/read/27537839/evaluation-of-a-salmonella-strain-lacking-the-secondary-messenger-c-di-gmp-and-rpos-as-a-live-oral-vaccine
#12
Cristina Latasa, Maite Echeverz, Begoña García, Carmen Gil, Enrique García-Ona, Saioa Burgui, Noelia Casares, Sandra Hervás-Stubbs, Juan José Lasarte, Iñigo Lasa, Cristina Solano
Salmonellosis is one of the most important bacterial zoonotic diseases transmitted through the consumption of contaminated food, with chicken and pig related products being key reservoirs of infection. Although numerous studies on animal vaccination have been performed in order to reduce Salmonella prevalence, there is still a need for an ideal vaccine. Here, with the aim of constructing a novel live attenuated Salmonella vaccine candidate, we firstly analyzed the impact of the absence of cyclic-di-GMP (c-di-GMP) in Salmonella virulence...
2016: PloS One
https://www.readbyqxmd.com/read/27514610/heterologous-expression-of-antigenic-peptides-in-bacillus-subtilis-biofilms
#13
Cédric M Vogt, Elisabeth M Schraner, Claudio Aguilar, Catherine Eichwald
BACKGROUND: Numerous strategies have been developed for the display of heterologous proteins in the surface of live bacterial carriers, which can be used as vaccines, immune-modulators, cancer therapy or bioremediation. Bacterial biofilms have emerged as an interesting approach for the expression of proteins of interest. Bacillus subtilis is a well-described, endospore-forming organism that is able to form biofilms and also used as a probiotic, thus making it a suitable candidate for the display of heterologous proteins within the biofilm...
August 11, 2016: Microbial Cell Factories
https://www.readbyqxmd.com/read/27508518/host-pathogen-interactions-of-nontypeable-haemophilus-influenzae-from-commensal-to-pathogen
#14
REVIEW
Benjamin Luke Duell, Yu-Ching Su, Kristian Riesbeck
Nontypeable Haemophilus influenzae (NTHi) is a commensal microbe often isolated from the upper and lower respiratory tract. This bacterial species can cause sinusitis, acute otitis media in preschool children, exacerbations in patients suffering from chronic obstructive pulmonary disease, as well as conjunctivitis and bacteremia. Since the introduction of a vaccine against H. influenzae serotype b in the 1990s, the burden of H. influenzae-related infections has been increasingly dominated by NTHi. Understanding the ability of NTHi to cause infection is currently an expanding area of study...
November 2016: FEBS Letters
https://www.readbyqxmd.com/read/27427517/protective-effect-of-pilin-protein-with-alum-naloxone-adjuvant-against-acute-pulmonary-pseudomonas-aeruginosa-infection
#15
Abbas Zare Banadkoki, Morteza Keshavarzmehr, Zahra Afshar, Neda Aleyasin, Mohammad Javad Fatemi, Bahador Behrouz, Farhad B Hashemi
Pseudomonas aeruginosa is an important opportunistic human pathogen that causes a wide variety of severe nosocomial infections. Type IV pili of P. aeruginosa are made up of polymerized pilin that aids in bacterial adhesion, biofilm formation and twitching motility. The aim of this study was to evaluate the efficacy of alum and naloxone (alum+NLX) as an adjuvant for P. aeruginosa recombinant PilA (r-PilA) as a vaccine candidate in the improvement of humoral and cellular immunity. Primary immunization with r-PilA in combination with alum+NLX followed by two booster shots was sufficient to generate robust cellular and humoral responses, which were Th1 and Th2 type responses consisting of IgG1 and IgG2a subtypes...
September 2016: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/27392114/flagellin-rpac-vaccine-inhibits-biofilm-formation-but-not-proliferation-of-s-mutans
#16
Ying Sun, Yi Yang, Dihan Zhou, Yuan Cao, Jie Yu, Bali Zhao, Maohua Zhong, Yaoming Li, Jingyi Yang, Huimin Yan
As the main etiologic bacterium of dental caries, Streptococcus mutans (S. mutans) has been considered as the primary object of vaccine research. We previously constructed a recombinant flagellin-rPAc fusion protein (KF-rPAc) that consists of an alanine-rich region to proline-rich region fragment of PAc (rPAc) from S. mutans and flagellin KF from E.coli K12 strain. Intranasal (i.n) immunization of KF-rPAc could induce high level of rPAc-specific antibody responses and offer robust protection against dental caries...
November 2016: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/27386013/biological-and-immunogenicity-property-of-igy-anti-s-mutans-comd
#17
E W Bachtiar, B M Bachtiar, R D Soejoedono, I W Wibawan, A Afdhal
OBJECTIVE: This study aims to elucidate the effect of IgY anti ComD on the biological properties of Streptococcus mutans. (S. mutans) ComD is an interspecies quorum-sensing signaling receptor that plays an important role in biofilm formation by S. mutans. MATERIALS AND METHODOLOGY: Egg yolk IgY was produced by the immunization of chickens with a DNA vaccine containing the ComD DNA coding region. We evaluated the effect of the antibody on biofilm formation by S. mutans isolated from subjects with or without dental caries...
2016: Open Dentistry Journal
https://www.readbyqxmd.com/read/27321680/genetically-modified-bacteriophages-in-applied-microbiology
#18
REVIEW
P Bárdy, R Pantůček, M Benešík, J Doškař
Bacteriophages represent a simple viral model of basic research with many possibilities for practical application. Due to their ability to infect and kill bacteria, their potential in the treatment of bacterial infection has been examined since their discovery. With advances in molecular biology and gene engineering, the phage application spectrum has been expanded to various medical and biotechnological fields. The construction of bacteriophages with an extended host range or longer viability in the mammalian bloodstream enhances their potential as an alternative to conventional antibiotic treatment...
September 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27265456/probing-vaccine-antigens-against-bovine-mastitis-caused-by-streptococcus-uberis
#19
Rosa Collado, Antoni Prenafeta, Luis González-González, Josep Antoni Pérez-Pons, Marta Sitjà
Streptococcus uberis is a worldwide pathogen that causes intramammary infections in dairy cattle. Because virulence factors determining the pathogenicity of S. uberis have not been clearly identified so far, a commercial vaccine is not yet available. Different S. uberis strains have the ability to form biofilm in vitro, although the association of this kind of growth with the development of mastitis is unknown. The objective of this study was to evaluate the potential use as vaccine antigens of proteins from S...
July 19, 2016: Vaccine
https://www.readbyqxmd.com/read/27259829/the-serine-protease-autotransporter-tsh-contributes-to-the-virulence-of-edwardsiella-tarda
#20
Yong-Hua Hu, Hai-Zhen Zhou, Qian-Wen Jin, Jian Zhang
The temperature-sensitive hemagglutinin (Tsh), identified as serine protease autotransporters of the Enterobacteriaceae (SPATEs) proteins, is an important virulence factor for avian-pathogenic Escherichia coli (APEC) and uropathogenic E. coli. However, little is known about the role of Tsh as a virulence factor in Edwardsiella tarda, a severe fish pathogen. In this study, we characterized the Tsh of E. tarda (named TshEt) and examined its function and vaccine potential. TshEt is composed of 1224 residues and has three functional domains typical for autotransporters...
June 30, 2016: Veterinary Microbiology
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