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https://www.readbyqxmd.com/read/28802409/exploring-the-potential-of-t7-bacteriophage-protein-gp2-as-a-novel-inhibitor-of-mycobacterial-rna-polymerase
#1
J du Plessis, R Cloete, L Burchell, P Sarkar, R M Warren, A Christoffels, S Wigneshweraraj, S L Sampson
Over the past six decades, there has been a decline in novel therapies to treat tuberculosis, while the causative agent of this disease has become increasingly resistant to current treatment regimens. Bacteriophages (phages) are able to kill bacterial cells and understanding this process could lead to novel insights for the treatment of mycobacterial infections. Phages inhibit bacterial gene transcription through phage-encoded proteins which bind to RNA polymerase (RNAP), thereby preventing bacterial transcription...
September 2017: Tuberculosis
https://www.readbyqxmd.com/read/28774966/complete-genome-sequence-of-citrobacter-freundii-myophage-mijalis
#2
Sruti Parvataneni, Eleni M Mijalis, Gabriel F Kuty Everett, Eric S Rasche, Mei Liu, Jason J Gill
Citrobacter freundii is responsible for various opportunistic nosocomial infections. Phage therapies against C. freundii may prove useful in human medicine for treatment of infections caused by the ubiquitous bacteria. Here, we announce the complete genome sequence of the C. freundii Felix O1-like myophage Mijalis and present its features.
August 3, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28757045/efficacy-of-potential-phage-cocktails-against-vibrio-harveyi-and-closely-related-vibrio-species-isolated-from-shrimp-aquaculture-environment-in-the-south-east-coast-of-india
#3
Nattan Stalin, Pappu Srinivasan
A diverse set of novel phages infecting the marine pathogenic Vibrio harveyi was isolated from shrimp aquaculture environments in the south east coast of India. Based on initial screening, three phages with a broad host range revealed that the growth inhibition of phage is relatively specific to V. harveyi. They were also able to infect V. alginolyticus and V. parahemolyticus that belonged to the Harveyi clade species from shrimp pond and sea coast environment samples. However, the impact of these phages on their host bacterium are well understood; a one-step growth curve experiment and transmission electron microscope (TEM) revealed three phages grouped under the Myoviridae (VHM1 and VHM2); Siphoviridae (VHS1) family...
August 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28746884/effects-of-single-and-combined-use-of-bacteriophages-and-antibiotics-to-inactivate-escherichia-coli
#4
Nádia Valério, Cristiana Oliveira, Vânia Jesus, Tatiana Branco, Carla Pereira, Catarina Moreirinha, Adelaide Almeida
A major concern of phage therapy is the emergency of phage-resistant mutants. This limitation can be overcome by the combined use of phages and antibiotics. It has been shown that the combination of antibiotics and phages is an alternative that cannot only be effective at reducing bacterial numbers, but also to contribute to the management of resistance levels. However, this view has only been discussed with regard to antibiotic resistance and not to control phage-mutant emergence. In our study we compared not only the resistance of the bacteria to the four antibiotics tested with and without phages addition, but also the resistance to the phages in the presence and absence of antibiotics...
July 23, 2017: Virus Research
https://www.readbyqxmd.com/read/28744632/combinatorial-screening-of-peptides-specific-ligands-of-death-receptor-dr5
#5
V M Ukrainskaya, A V Stepanov, A A Belogurov, A G Gabibov
Death receptors, in particular DR5, are highly attractive targets of antitumor therapy. The major limitation to application of natural death receptor ligands (TRAIL) is their non-specific cytotoxicity against normal cells. Since TRAIL can also bind decoy receptors (DcR) and prevent induction of apoptosis, the search for new DR-specific ligands is a topical issue. In the present study, we used combinatorial phage display peptide libraries to select a panel of DR5-binding amino acid sequences. A comparative analysis of the selected peptides enabled identification of the consensus sequence responsible for binding to DR5...
July 25, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28739792/transfersomal-phage-cocktail-an-effective-treatment-against-methicillin-resistant-s-aureus-mrsa-mediated-skin-and-soft-tissue-infections-sstis
#6
Sanjay Chhibber, Ashu Shukla, Sandeep Kaur
Emergence of drug resistance has rekindled the interest in phage therapy as an alternative treatment option. Its potency, safety and proven efficacy is worth noting. However, phage therapy still suffers from issues of poor stability, narrow spectrum and poor pharmacokinetic profile. It therefore becomes essential to look into the use of Drug Delivery Systems (DDS) for efficient delivery of lytic phages in vivo For the first time, the present study has evaluated the use of nano-structured lipid based carriers i...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28737021/infection-therapy-the-problem-of-drug-resistance-and-possible-solutions
#7
Harald Brüssow
The rising antibiotic resistance in major bacterial pathogens together with the breakdown of the antibiotic discovery platform creates a critical situation for infection therapy. Recent developments reviving new antibiotic discovery from defining chemical rules for membrane-passing compounds to isolation chips for soil bacteria and exploring the human microbiome for antibiotic-producing bacteria are discussed. The potential of bacteriocins, tailocins, phage lysins, phages, probiotics and commensal blends as alternatives to antibiotics is evaluated...
July 24, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28733718/antimicrobial-resistance-in-the-next-30%C3%A2-years-humankind-bugs-and-drugs-a-visionary-approach
#8
REVIEW
Matteo Bassetti, Garyphallia Poulakou, Etienne Ruppe, Emilio Bouza, Sebastian J Van Hal, Adrian Brink
PURPOSE: To describe the current standards of care and major recent advances with regard to antimicrobial resistance (AMR) and to give a prospective overview for the next 30 years in this field. METHODS: Review of medical literature and expert opinion were used in the development of this review. RESULTS: There is undoubtedly a large clinical and public health burden associated with AMR in ICU, but it is challenging to quantify the associated excess morbidity and mortality...
July 21, 2017: Intensive Care Medicine
https://www.readbyqxmd.com/read/28733706/phage-display-selection-in-vitro-characterization-and-correlative-pet-imaging-of-a-novel-her3-peptide
#9
Benjamin M Larimer, Nicholas Phelan, Eric Wehrenberg-Klee, Umar Mahmood
PURPOSE: HER3 (ERBB3) is a receptor tyrosine kinase that is implicated in treatment resistance across multiple cancers, including those of the breast, lung, and prostate. Overexpression of HER3 following targeted therapy can occur rapidly and heterogeneously both within a single lesion and across sites of metastasis, making protein quantification by biopsy highly challenging. A global, non-invasive methodology such as positron emission tomography (PET) imaging can permit serial quantification of HER3, providing a useful approach to monitor HER3 expression across the entire tumor burden both prior to and following treatment...
July 21, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28730979/adsorption-of-staphylococcus-viruses-s13-and-s24-1-on-staphylococcus-aureus-strains-with-different-glycosidic-linkage-patterns-of-wall-teichoic-acids
#10
Jumpei Uchiyama, Maya Taniguchi, Kenji Kurokawa, Iyo Takemura-Uchiyama, Takako Ujihara, Hidekatsu Shimakura, Yoshihiko Sakaguchi, Hironobu Murakami, Masahiro Sakaguchi, Shigenobu Matsuzaki
The group of phages belonging to the family Podoviridae, genus P68virus, including Staphylococcus viruses S13' and S24-1, are important because of their benefits in phage therapy against Staphylococcus aureus infections. The O-glycosidic linkage patterns of wall teichoic acids (WTAs) in S. aureus cell walls seem to be important for adsorption of this phage group. In this study, the adsorption of Staphylococcus viruses S13' and S24-1 to S. aureus was examined using strains with modified WTA glycosidic linkage patterns...
July 21, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28720345/the-potential-of-phage-therapy-in-cystic-fibrosis-essential-human-bacterial-phage-interactions-and-delivery-considerations-for-use-in-pseudomonas-aeruginosa-infected-airways
#11
REVIEW
Stephanie Trend, Angela M Fonceca, William G Ditcham, Anthony Kicic, Arest Cf
As antimicrobial-resistant microbes become increasingly common and a significant global issue, novel approaches to treating these infections particularly in those at high risk are required. This is evident in people with cystic fibrosis (CF), who suffer from chronic airway infection caused by antibiotic resistant bacteria, typically Pseudomonas aeruginosa. One option is bacteriophage (phage) therapy, which utilises the natural predation of phage viruses upon their host bacteria. This review summarises the essential and unique aspects of the phage-microbe-human lung interactions in CF that must be addressed to successfully develop and deliver phage to CF airways...
July 15, 2017: Journal of Cystic Fibrosis: Official Journal of the European Cystic Fibrosis Society
https://www.readbyqxmd.com/read/28719657/isolation-and-in-vitro-evaluation-of-bacteriophages-against-mdr-bacterial-isolates-from-septic-wound-infections
#12
Roja Rani Pallavali, Vijaya Lakshmi Degati, Dakshayani Lomada, Madhava C Reddy, Vijaya Raghava Prasad Durbaka
Multi-drug resistance has become a major problem for the treatment of pathogenic bacterial infections. The use of bacteriophages is an attractive approach to overcome the problem of drug resistance in several pathogens that cause fatal diseases. Our study aimed to isolate multi drug resistant bacteria from patients with septic wounds and then isolate and apply bacteriophages in vitro as alternative therapeutic agents. Pus samples were aseptically collected from Rajiv Gandhi Institute of Medical Science (RIMS), Kadapa, A...
2017: PloS One
https://www.readbyqxmd.com/read/28717637/phage-therapy-in-a-16-year-old-boy-with-netherton-syndrome
#13
Pikria Zhvania, Naomi Sulinger Hoyle, Lia Nadareishvili, Dea Nizharadze, Mzia Kutateladze
Netherton syndrome (NS) is a rare autosomal recessive disorder, characterized by a classical triad of clinical features, including congenital ichthyosiform erythroderma, trichorrhexis invaginata, and atopic diathesis coupled with frequent bacterial infections (1). The genetic basis for the disease has been recently identified with mutations in gene SPINK5, which is involved in the regulation of formation of skin barriers. We report on a 16-year-old male with all the typical manifestations of NS, including atopic diathesis and ongoing serious staphylococcal infections and allergy to multiple antibiotics whose family sought help at the Eliava Phage Therapy Center when all other treatment options were failing...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28713356/a-genotypic-analysis-of-five-p-aeruginosa-strains-after-biofilm-infection-by-phages-targeting-different-cell-surface-receptors
#14
Diana P Pires, Andreas Dötsch, Erin M Anderson, Youai Hao, Cezar M Khursigara, Joseph S Lam, Sanna Sillankorva, Joana Azeredo
Antibiotic resistance constitutes one of the most serious threats to the global public health and urgently requires new and effective solutions. Bacteriophages are bacterial viruses increasingly recognized as being good alternatives to traditional antibiotic therapies. In this study, the efficacy of phages, targeting different cell receptors, against Pseudomonas aeruginosa PAO1 biofilm and planktonic cell cultures was evaluated over the course of 48 h. Although significant reductions in the number of viable cells were achieved for both cases, the high level of adaptability of the bacteria in response to the selective pressure caused by phage treatment resulted in the emergence of phage-resistant variants...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28704651/synergy-between-the-host-immune-system-and-bacteriophage-is-essential-for-successful-phage-therapy-against-an-acute-respiratory-pathogen
#15
Dwayne R Roach, Chung Yin Leung, Marine Henry, Eric Morello, Devika Singh, James P Di Santo, Joshua S Weitz, Laurent Debarbieux
The rise of multi-drug-resistant (MDR) bacteria has spurred renewed interest in the use of bacteriophages in therapy. However, mechanisms contributing to phage-mediated bacterial clearance in an animal host remain unclear. We investigated the effects of host immunity on the efficacy of phage therapy for acute pneumonia caused by MDR Pseudomonas aeruginosa in a mouse model. Comparing efficacies of phage-curative and prophylactic treatments in healthy immunocompetent, MyD88-deficient, lymphocyte-deficient, and neutrophil-depleted murine hosts revealed that neutrophil-phage synergy is essential for the resolution of pneumonia...
July 12, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28702137/phage-therapy-assessment-of-the-efficacy-of-a-bacteriophage-isolated-in-the-treatment-of-salmonellosis-induced-by-salmonella-enteritidis-in-mice
#16
Farhad Nikkhahi, Mohammad Mehdi Soltan Dallal, Mahmood Alimohammadi, Abbas Rahimi Foroushani, Zahra Rajabi, Fatemeh Fardsanei, Seyed Mostafa Imeni, Parisa Torabi Bonab
AIM: This work aims to isolate and perform comparative studies of a phages active against a Salmonella enteritidis strain from Iran. Also, suitable phage candidates for therapy of mice will be selected. BACKGROUND: Bacteriophage is of particular interest as a biocontrol agent in the prevention of food-borne illnesses. In recent years tend to use bacteriophages to control pathogenic bacteria has increased. A bacteriophage is considered to be a potent antibiotic alternative for treating bacterial infections...
2017: Gastroenterology and Hepatology From Bed to Bench
https://www.readbyqxmd.com/read/28689690/genome-analysis-of-three-novel-lytic-vibrio-coralliilyticus-phages-isolated-from-seawater-okinawa-japan
#17
Chitra Ramphul, Beatriz Estela Casareto, Hideo Dohra, Tomohiro Suzuki, Katsuhiko Yoshimatsu, Koichi Yoshinaga, Yoshimi Suzuki
Three novel Vibrio phages were isolated from seawater in Okinawa. The Vibrio phage RYC infected Vibrio coralliilyticus SWA 07, while Vibrio phages CKB-S1 and CKB-S2 infected the coral pathogen V. coralliilyticus P1 (LMG 23696). The Vibrio phages CKB-S1 and CKB-S2 displayed head-tail structures whereas the Vibrio phage RYC showed a tailless non-enveloped capsid. All these Vibrio phages contained linear and double-stranded DNA. The whole genome sequencing revealed that Vibrio phage RYC has a larger genome size compared to Vibrio phages CKB-S1 and CKB-S2, and six tRNAs genes were found only in Vibrio phage RYC...
July 6, 2017: Marine Genomics
https://www.readbyqxmd.com/read/28688779/formulation-stabilisation-and-encapsulation-of-bacteriophage-for-phage-therapy
#18
REVIEW
Danish J Malik, Ilya J Sokolov, Gurinder K Vinner, Francesco Mancuso, Salvatore Cinquerrui, Goran T Vladisavljevic, Martha R J Clokie, Natalie J Garton, Andrew G F Stapley, Anna Kirpichnikova
Against a backdrop of global antibiotic resistance and increasing awareness of the importance of the human microbiota, there has been resurgent interest in the potential use of bacteriophages for therapeutic purposes, known as phage therapy. A number of phage therapy phase I and II clinical trials have concluded, and shown phages don't present significant adverse safety concerns. These clinical trials used simple phage suspensions without any formulation and phage stability was of secondary concern. Phages have a limited stability in solution, and undergo a significant drop in phage titre during processing and storage which is unacceptable if phages are to become regulated pharmaceuticals, where stable dosage and well defined pharmacokinetics and pharmacodynamics are de rigueur...
May 14, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28688285/a-strategy-for-actualization-of-active-targeting-nanomedicine-practically-functioning-in-a-living-body
#19
Kyoung Jin Lee, Seol Hwa Shin, Jae Hee Lee, Eun Jin Ju, Yun-Yong Park, Jung Jin Hwang, Young-Ah Suh, Seung-Mo Hong, Se Jin Jang, Jung Shin Lee, Si Yeol Song, Seong-Yun Jeong, Eun Kyung Choi
Designing nanocarriers with active targeting has been increasingly emphasized as for an ideal delivery mechanism of anti-cancer therapeutic agents, but the actualization has been constrained by lack of reliable strategy ultimately applicable. Here, we designed and verified a strategy to achieve active targeting nanomedicine that works in a living body, utilizing animal models bearing a patient's tumor tissue and subjected to the same treatments that would be used in the clinic. The concept for this strategy was that a novel peptide probe and its counterpart protein, which responded to a therapy, were identified, and then the inherent ability of the peptide to target the designated tumor protein was used for active targeting in vivo...
June 30, 2017: Biomaterials
https://www.readbyqxmd.com/read/28669053/efficient-targeting-of-cd13-on-cancer-cells-by-the-immunotoxin-scfv13-eta-and-the-bispecific-scfv-13xds16
#20
Elena Grieger, Gerrit Gresch, Judith Niesen, Mira Woitok, Stefan Barth, Rainer Fischer, Rolf Fendel, Christoph Stein
PURPOSE: Treatment of cancer using standard chemotherapy still offers a poor prognosis combined with severe side effects. Novel antibody-based therapies have been shown to overcome low efficiency and lack of selectivity by targeting cancer-associated antigens, such as aminopeptidase CD13. METHODS: We isolated a high-affinity CD13-specific single-chain fragment variable (scFv13) from a phage display library of V-genes from mice immunized with soluble antigen. An immunotoxin comprising the scFv13 and a truncated version of the exotoxin A of Pseudomonas aeruginosa (ETA', scFv13-ETA') and a bispecific scFv targeting CD13 and CD16 simultaneously (bsscFv[13xds16]) was generated and investigated for their therapeutic potential...
July 1, 2017: Journal of Cancer Research and Clinical Oncology
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