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https://www.readbyqxmd.com/read/28933530/future-priorities-in-tackling-infections-due-to-brain-eating-amoebae
#1
Naveed Ahmed Khan, Ayaz Anwar, Ruqaiyyah Siddiqui
Brain-eating amoebae (Acanthamoeba spp., Balamuthia mandrillaris, and Naegleria fowleri) can cause opportunistic infections involving the central nervous system. It is troubling that the mortality rate is more than 90% despite advances in antimicrobial chemotherapy over the last few decades. Here, we describe urgent key priorities for improving outcomes from infections due to brain-eating amoebae.
September 21, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28930264/essential-oil-from-piper-aduncum-chemical-analysis-antimicrobial-assessment-and-literature-review
#2
Lianet Monzote, Ramón Scull, Paul Cos, William N Setzer
Background: The challenge in antimicrobial chemotherapy is to find safe and selective agents with potency that will not be compromised by previously developed resistance. Terrestrial plants could provide new leads to antibacterial, antifungal, or antiprotozoal activity. Methods: The essential oil (EO) of Piper aduncum L. (Piperaceae) from Cuba was analyzed by gas chromatography-mass spectrometry (GC-MS). A cluster analysis of P. aduncum EO compositions reported in the literature was carried out. The EO was screened against a panel of microorganisms (bacteria, fungi, parasitic protozoa) as well as for cytotoxicity against human cells...
July 2, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28893638/innate-immune-responses-play-a-key-role-in-controlling-infection-of-the-intestinal-epithelium-by-cryptosporidium
#3
REVIEW
Fabrice Laurent, Sonia Lacroix-Lamandé
Cryptosporidium infection leads to acute diarrhea worldwide. The development of cryptosporidiosis is closely related to the immune status of its host, affecting primarily young ruminants, infants, and immunocompromised individuals. In recent years, several studies have improved our knowledge on the immune mechanisms responsible for the control of the acute phase of the infection and have highlighted the importance of innate immunity. The parasite develops in the apical side of intestinal epithelial cells, giving these cells a central role, as they are both the exclusive host cell for replication of the parasite and participate in the protective immune response...
September 8, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28893354/similar-virulence-properties-of-infection-and-colonization-associated-pseudomonas-aeruginosa
#4
Aditi, Malini Shariff, Sunil K Chhabra, Mujeeb-Ur Rahman
PURPOSE: Pseudomonas aeruginosa is one of the agents that are commonly implicated in nosocomial infections. However, it is also present as a commensal in various body sites of healthy persons, making the diagnosis of infection by culture difficult. A number of virulence factors expressed by the organism have been implicated in its pathogenicity. We undertook this study to identify the host and organism factors associated with infection. METHODOLOGY: Pathogenic, colonizing and environmental isolates were tested for apr, lasB, the T3SS effector exoenzymes (exoS, exoT, exoU and exoY) and toxA genes, biofilm production and antimicrobial susceptibility...
September 12, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28860757/photodynamic-antimicrobial-chemotherapy-for-staphylococcus-aureus-and-multidrug-resistant-bacterial-burn-infection-in-vitro-and-in-vivo
#5
Bingjie Mai, Yiru Gao, Min Li, Xiaobing Wang, Kun Zhang, Quanhong Liu, Chuanshan Xu, Pan Wang
BACKGROUND AND OBJECTIVES: Antibiotic resistance has emerged as one of the most important determinants of outcome in patients with serious infections, along with the virulence of the underlying pathogen. Photodynamic antimicrobial chemotherapy (PACT) has been proposed as an alternative approach for the inactivation of bacteria. This study aims to evaluate the antibacterial effect of sinoporphyrin sodium (DVDMS)-mediated PACT on Staphylococcus aureus and multidrug resistant S. aureus in vitro and in vivo...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28859441/baicalein-acts-as-a-nephroprotectant-that-ameliorates-colistin-induced-nephrotoxicity-by-activating-the-antioxidant-defence-mechanism-of-the-kidneys-and-down-regulating-the-inflammatory-response
#6
Chongshan Dai, Shusheng Tang, Yang Wang, Tony Velkov, Xilong Xiao
Background: Nephrotoxicity is the major adverse effect patients experience during colistin therapy. The development of effective nephroprotective agents that can be co-administered during polymyxin therapy remains a priority area in antimicrobial chemotherapy. Objectives: To investigate the nephroprotective effect of baicalein, a component of the root of Scutellaria baicalensis, against colistin-induced nephrotoxicity using a mouse model. Methods: C57BL/6 mice were randomly divided into the following groups: control, baicalein 100 mg/kg/day (administered orally), colistin (18 mg/kg/day administered intraperitoneally) and colistin (18 mg/kg/day) plus baicalein (25, 50 and 100 mg/kg/day)...
September 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28856473/the-role-of-natural-antimicrobial-peptides-during-infection-and-chronic-inflammation
#7
REVIEW
Xiaojing Xia, Likun Cheng, Shouping Zhang, Lei Wang, Jianhe Hu
Natural antimicrobial peptides (AMPs), a family of small polypeptides that are produced by constitutive or inducible expression in organisms, are integral components of the host innate immune system. In addition to their broad-spectrum antibacterial activity, natural AMPs also have many biological activities against fungi, viruses and parasites. Natural AMPs exert multiple immunomodulatory roles that may predominate under physiological conditions where they lose their microbicidal properties in serum and tissue environments...
August 30, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28856437/diagnosis-and-empirical-treatment-of-fever-of-unknown-origin-fuo-in-adult-neutropenic-patients-guidelines-of-the-infectious-diseases-working-party-agiho-of-the-german-society-of-hematology-and-medical-oncology-dgho
#8
REVIEW
W J Heinz, D Buchheidt, M Christopeit, M von Lilienfeld-Toal, O A Cornely, H Einsele, M Karthaus, H Link, R Mahlberg, S Neumann, H Ostermann, O Penack, M Ruhnke, M Sandherr, X Schiel, J J Vehreschild, F Weissinger, G Maschmeyer
Fever may be the only clinical symptom at the onset of infection in neutropenic cancer patients undergoing myelosuppressive chemotherapy. A prompt and evidence-based diagnostic and therapeutic approach is mandatory. A systematic search of current literature was conducted, including only full papers and excluding allogeneic hematopoietic stem cell transplant recipients. Recommendations for diagnosis and therapy were developed by an expert panel and approved after plenary discussion by the AGIHO. Randomized clinical trials were mainly available for therapeutic decisions, and new diagnostic procedures have been introduced into clinical practice in the past decade...
August 30, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28853858/enhanced-photobactericidal-and-targeting-properties-of-a-cationic-porphyrin-following-the-attachment-of-polymyxin-b
#9
Florent Le Guern, Vincent Sol, Catherine Ouk, Philippe Arnoux, Céline Frochot, Tan-Sothea Ouk
A novel compound consisting of a cationic porphyrin covalently attached to a derivative of polymyxin B has been synthesized and presents enhanced activity and targeting properties compared to the usual cationic porphyrins recognized as efficient photosensitizers in photodynamic antimicrobial chemotherapy (PACT). A synthesis pathway was established to preserve the bactericidal activity of the peptide. Accordingly, the N-terminal amino acid (l-2,4-diaminobutyric acid) of polymyxin B (PMB) was switched for a cysteine residue...
September 11, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28842352/amino-acid-or-peptide-conjugates-of-acridine-acridone-and-quinoline-quinolone-containing-drugs-a-critical-examination-of-their-clinical-effectiveness-within-a-twenty-year-timeframe-in-antitumor-chemotherapy-and-treatment-of-infectious-diseases
#10
REVIEW
Monika Kukowska
Acridines/acridones, quinolines/quinolones (chromophores) and their derivatives constitute extremely important family of compounds in current medicine. Great significance of the compounds is connected with antimicrobial and antitumor activities. Combining these features together in one drug seems to be long-term benefit, especially in oncology therapy. The attractiveness of the chromophore drugs is still enhanced by elimination their toxicity and improvement not only selectivity, specificity but also bioavailability...
August 22, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28840351/activity-of-temocillin-and-15-other-agents-including-fosfomycin-and-colistin-against-enterobacteriaceae-in-hong-kong
#11
Margaret Ip, Christopher K Lai, Kitty S C Fung, K-Tak Wong, Chendi Zhu, Sebastien Van de Velde, Dominic N Tsang, Peter Hawkey
Limited data are available on temocillin susceptibilities in Enterobacteriaceae from Asian countries where antimicrobial resistance is prevalent. The in vitro activities of temocillin and 15 commonly used antimicrobials against 613 non-duplicate blood (n = 310) and urine (with clinically significant bacteriuria; n = 303) isolates of Enterobacteriaceae from patients who attended 3 out of 7 clusters of public hospitals of the Hospital Authority, Hong Kong, during 2015/2016 were tested. Minimum inhibitory concentrations (MICs) were determined by Clinical and Laboratory Standards Institute (CLSI) microbroth dilution (agar dilution with fosfomycin)...
August 25, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28836551/clinical-characteristics-of-bloodstream-infections-in-pediatric-acute-leukemia-a-single-center-experience-with-231-patients
#12
Jia-Feng Yao, Nan Li, Jin Jiang
BACKGROUND: Acute leukemia is the most common pediatric hematological malignancy. Bloodstream infections (BSIs) are severe complications in these patients during chemotherapy. This study aimed to explore the clinical presentation and etiology of BSI, as well as the common sites of infection, and to provide a basis for the rational regarding antibiotic use. METHODS: We performed a retrospective chart review of all pediatric patients who had acute leukemia accompanied by a BSI in our hospital from December 2011 to September 2015...
September 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28833608/cherchez-l-electron
#13
Pascal Mäser
Who wouldn't want to have a drug that is activated only in the target cell? Prodrugs that are metabolically triggered inside the pathogen but not in the host are an attractive concept in antimicrobial chemotherapy. Of particular interest are bioreductive prodrugs such as nitro compounds or quinones that can initiate cytotoxic redox cascades and release active metabolites. The critical points for the selectivity of such molecules are, what is the source of the electrons that activate the prodrug, and which are the enzymes that catalyze the reduction? In this issue, Meredith et al...
August 18, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28818544/trends-in-antimicrobial-resistance-in-bloodstream-infection-isolates-at-a-large-urban-hospital-in-malawi-1998-2016-a-surveillance-study
#14
Patrick Musicha, Jennifer E Cornick, Naor Bar-Zeev, Neil French, Clemens Masesa, Brigitte Denis, Neil Kennedy, Jane Mallewa, Melita A Gordon, Chisomo L Msefula, Robert S Heyderman, Dean B Everett, Nicholas A Feasey
BACKGROUND: Bacterial bloodstream infection is a common cause of morbidity and mortality in sub-Saharan Africa, yet few facilities are able to maintain long-term surveillance. The Malawi-Liverpool-Wellcome Trust Clinical Research Programme has done sentinel surveillance of bacteraemia since 1998. We report long-term trends in bloodstream infection and antimicrobial resistance from this surveillance. METHODS: In this surveillance study, we analysed blood cultures that were routinely taken from adult and paediatric patients with fever or suspicion of sepsis admitted to Queen Elizabeth Central Hospital, Blantyre, Malawi from 1998 to 2016...
August 14, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28807757/strategies-to-counter-transmission-of-superbugs-by-targeting-free-living-amoebae
#15
Ruqaiyyah Siddiqui, Naveed Ahmed Khan
Bacterial infections have remained significant despite our advances in the development of a plethora of disinfectants as well as antimicrobial chemotherapy. This is in part due to our incomplete understanding of the prevalence of bacterial pathogens in the environmental and clinical settings. Several lines of evidence suggest that Acanthamoeba is one of the most ubiquitous/resilient protists that also acts as a host/reservoir for pathogenic microbes. Thus targeting the hardy host, which harbour microbial pathogens, offer a potential avenue to counter infection transmission, particularly hospital/community-acquired infections...
August 12, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28802152/comparison-and-analysis-of-the-structures-and-binding-modes-of-antifungal-se-and-cyp51-inhibitors
#16
Bin Sun, Wanxu Huang, Min Liu, Kang Lei
With the abuse of clinical broad-spectrum antimicrobial agents, immunosuppressive agents, chemotherapy drugs, the emergence of pathogenic fungi resistance is more and more frequent. However, there is still no effective treatment for the fungal resistance. Squalenee epoxidase (SE) and 14 α-demethylase (CYP51) are important antifungal drug targets. In order to achieve a deeper insight into the structural characteristics and the action modes of SE and CYP51inhibitors, the homology model of SE (Candida albicans) was constructed using monooxygenase of Pseudomonas aeruginosa as template, and the reliability of model was confirmed by Ramachandran plots and Verify 3D...
August 1, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28781126/targeting-mycobacterium-tuberculosis-sensitivity-to-thiol-stress-at-acidic-ph-kills-the-bacterium-and-potentiates-antibiotics
#17
Garry B Coulson, Benjamin K Johnson, Huiqing Zheng, Christopher J Colvin, Robert J Fillinger, Elizabeth R Haiderer, Neal D Hammer, Robert B Abramovitch
Mycobacterium tuberculosis (Mtb) must sense and adapt to immune pressures such as acidic pH during pathogenesis. The goal of this study was to isolate compounds that inhibit acidic pH resistance, thus defining virulence pathways that are vulnerable to chemotherapy. Here, we report that the compound AC2P36 selectively kills Mtb at acidic pH and potentiates the bactericidal activity of isoniazid, clofazimine, and diamide. We show that AC2P36 activity is associated with thiol stress and causes an enhanced accumulation of intracellular reactive oxygen species at acidic pH...
August 17, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28759701/pharmacological-interventions-for-preventing-dry-mouth-and-salivary-gland-dysfunction-following-radiotherapy
#18
REVIEW
Philip Riley, Anne-Marie Glenny, Fang Hua, Helen V Worthington
BACKGROUND: Salivary gland dysfunction is an 'umbrella' term for the presence of either xerostomia (subjective sensation of dryness), or salivary gland hypofunction (reduction in saliva production). It is a predictable side effect of radiotherapy to the head and neck region, and is associated with a significant impairment of quality of life. A wide range of pharmacological interventions, with varying mechanisms of action, have been used for the prevention of radiation-induced salivary gland dysfunction...
July 31, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28758300/nonsurgical-and-surgical-treatment-of-periodontitis-how-many-options-for-one-disease
#19
REVIEW
Filippo Graziani, Dimitra Karapetsa, Bettina Alonso, David Herrera
Treatment of periodontitis aims at preventing further disease progression with the intentions to reduce the risk of tooth loss, minimize symptoms and perception of the disease, possibly restore lost periodontal tissue and provide information on maintaining a healthy periodontium. Therapeutic intervention includes introduction of techniques to change behavior, such as: individually tailored oral-hygiene instructions; a smoking-cessation program; dietary adjustment; subgingival instrumentation to remove plaque and calculus; local and systemic pharmacotherapy; and various types of surgery...
October 2017: Periodontology 2000
https://www.readbyqxmd.com/read/28758221/biological-medicinal-and-toxicological-significance-of-eucalyptus-leaf-essential-oil-a-review
#20
REVIEW
Ashok K Dhakad, Vijay V Pandey, Sobia Beg, Janhvi M Rawat
The genus Eucalyptus L'Heritier comprises about 900 species, of which more than 300 species contain volatile essential oil in their leaves. About 20 species, within these, have a high content of 1,8-cineole (more than 70 %), commercially used for the production of essential oils in pharmaceutical and cosmetic industries. However, Eucalyptus is extensively planted for pulp, plywood, solid wood production but its leaf aromatic oil has astounding widespread biological activities including antimicrobial, antiseptic, antioxidant, chemotherapy agent, respiratory and gastrointestinal disorders treatment, wound healing, and insecticidal/insect repellent, herbicidal, acaricidal, nematicidal, and perfumes, soap making and grease remover...
July 31, 2017: Journal of the Science of Food and Agriculture
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