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https://www.readbyqxmd.com/read/29150592/the-influence-of-genetic-stability-on-aspergillus-fumigatus-virulence-and-azole-resistance
#1
Thaila Fernanda Dos Reis, Lilian Pereira Silva, Patrícia Alves de Castro, Pollyne Borborema Almeida de Lima, Rafaela Andrade do Carmo, Marjorie Mendes Marini, José Franco da Silveira, Beatriz Henriques Ferreira, Fernando Rodrigues, Iran Malavazi, Gustavo H Goldman
Genetic stability is extremely important for the survival of every living organism and a very complex set of genes have evolved to cope with DNA repair upon DNA damage. Here, we investigated the Aspergillus fumigatus AtmA (Ataxia-telangiectasia mutated) and AtrA kinases and how they impact virulence and the evolution of azole resistance. We demonstrated that A. fumigatus atmA and atrA null mutants are haploid and have a discrete chromosomal polymorphism. The ΔatmA and ΔatrA strains are sensitive to several DNA damaging agents but surprisingly both strains were more resistant than the wild-type strain to paraquat, menadione, and hydrogen peroxide...
November 17, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29147867/population-structure-of-candida-parapsilosis-no-genetic-difference-between-french-and-urugayan-isolates-using-microsatellite-length-polymorphism
#2
Marie Desnos-Ollivier, Victoria Bórmida, Philippe Poirier, Céline Nourrisson, Dinorah Pan, Stéphane Bretagne, Andrès Puime, Françoise Dromer
Candida parapsilosis is a human commensal yeast, frequently involved in infection worldwide and especially in neonates. It is the second species responsible for bloodstream infections in Uruguay and the third species in France. We were interested in knowing whether the population structure of isolates responsible for candidemia in France and in Uruguay was different. Genotyping methods based on microsatellite length polymorphism (MLP) have been described and are especially used for investigation of local outbreaks...
November 16, 2017: Mycopathologia
https://www.readbyqxmd.com/read/29141535/sln-and-nlc-encapsulating-antifungal-agents-skin-drug-delivery-and-their-unexplored-potential-for-treating-onychomycosis
#3
Tais Gratieri, Anna Paula Krawczyk-Santos, Priscila Bianca Rodrigues da Rocha, Marcilio Cunha-Filho, Guilherme Martins Gelfuso, Ricardo Neves Marreto, Stephania Fleury Taveira
BACKGROUND: Lipid nanoparticles have been extensively studied for drug delivery of antifungal drugs, especially for dermatophytosis treatments. They can accumulate in skin appendages and release drugs in a controlled manner and also increase skin moisture, due to the formation of an occlusive film. Since moisture heavily influences nail and skin permeability, these systems seem to pose great potential for antifungal drug delivery. METHODS: We therefore compare skin and nail physiopathological structure and discuss the potential use of lipid nanoparticles in managing skin and nail mycoses, highlighting their unexplored use in onychomycosis...
November 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29136186/clonal-spread-and-azole-resistant-mechanisms-of-non-susceptible-candida-albicans-isolates-from-vulvovaginal-candidiasis-patients-in-three-shanghai-maternity-hospitals
#4
YongQin Wu, Cui Li, ZhiHeng Wang, Jing Gao, ZhenHua Tang, HuiFen Chen, ChunMei Ying
In our multicenter study, 43 fluconazole non-susceptible and 45 fluconazole-susceptible isolates were collected from vulvovaginal candidiasis (VVC) patients from three Shanghai maternity hospitals to analyze their molecular epidemiological features and fluconazole resistant mechanisms. Cross-resistance to fluconazole, itraconazole and voriconazole was observed in 53.5% of the nonsusceptible isolates. Though we acquired 12 clonal complexes (CCs) of diploid sequence types (DSTs) in clinical isolates by a multilocus sequence typing method, fluconazole nonsusceptible isolates all belonged to CC69 with a predominant genotype of DST 79...
November 9, 2017: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/29134932/outbreak-of-pichia-kudriavzevii-fungaemia-in-a-neonatal-intensive-care-unit
#5
T Nagarathnamma, Sneha K Chunchanur, Shivaprakash M Rudramurthy, K R Vineetha, Karthik Ramamurthy, Jillwin Joseph, R Ambica
PURPOSE: Fungaemia is associated with substantial morbidity and mortality in neonates admitted to neonatal intensive care units (NICUs). We report an outbreak of fungaemia in a NICU due to rare yeast, Pichia kudriavzevii (a teleomorph of Candida krusei). To the best of our knowledge, this is the first report of neonatal sepsis due to P. kudriavzevii. METHODOLOGY: Between August and September 2014, blood cultures from nine neonates diagnosed with late-onset sepsis in the NICU yielded yeast-like organisms...
November 14, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29133157/microbiological-and-clinical-characteristics-of-biofilm-forming-candida-parapsilosis-isolates-associated-with-fungaemia-and-their-impact-on-mortality
#6
Silvia Soldini, Brunella Posteraro, Antonietta Vella, Elena De Carolis, Elisa Borghi, Monica Falleni, Angela Raffaella Losito, Giuseppe Maiuro, Enrico Maria Trecarichi, Maurizio Sanguinetti, Mario Tumbarello
OBJECTIVES: Biofilm formation (BF) by fungal isolates may dramatically complicate infection. We determined the ability of C. parapsilosis isolates from single fungaemia episodes to form biofilms and we analysed biofilm subgroups for antifungal susceptibility and pathogenic potential. We then correlated BF with clinical characteristics and outcomes of the episodes. METHODS: BF was measured using the crystal-violet biomass assay, antifungal susceptibility of preformed biofilms was assessed, and virulence was studied using the Galleria mellonella model...
November 10, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29133044/molecular-docking-design-synthesis-and-antifungal-activity-study-of-novel-triazole-derivatives
#7
Junqi Wu, Tingjunhong Ni, Xiaoyun Chai, Ting Wang, Hongrui Wang, Jindong Chen, Yongsheng Jin, Dazhi Zhang, Shichong Yu, Yuanying Jiang
The incidence of life-threatening fungal infections has dramatically increased for decades. In order to develop novel antifungal agents, two series of (2R,3R)-1-(1H-1,2,4-triazol-1-yl)-2-(2,4-difluorophenyl)-3-(N-substitutied)-2-butanols (3a-o, 5a-f, 8a-u), which were analogues of voriconazole, were designed, synthesized and characterized by (1)H NMR, (13)C NMR and HRMS. The MIC80 values showed that the target compounds 3a-o indicated better activities than fluconazole on three important fungal pathogens except for 3i...
November 10, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29127050/do-antibacterial-and-antifungal-combinations-have-better-activity-against-clinically-relevant-fusarium-species-in-vitro-synergism
#8
Tarcieli Pozzebon Venturini, Abdullah M S Al-Hatmi, Luana Rossato, Maria Isabel Azevedo, Jéssica Tairine Keller, Carla Weiblen, Janio Morais Santurio, Sydney Hartz Alves
The objective of this study was to evaluate the susceptibility of 20 clinical isolates of Fusarium spp. against classic antifungals (amphotericin B [AMB], itraconazole [ITC], voriconazole [VRC] and caspofungin [CAS]) and to nonantifungal agents (amiodarone [AMD], doxycycline [DOX] and moxifloxacin [MXF]) using broth microdilution method. The combinations between these antifungal plus nonantifungal agents were also evaluated for the determination of FICI (fractional inhibitory concentration index) using the checkerboard technique...
November 7, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29125713/outbreak-of-invasive-aspergillosis-in-heart-transplant-recipients-the-role-of-screening-computed-tomography-scans-in-asymptomatic-patients-and-universal-antifungal-prophylaxis
#9
Dima Kabbani, Livia Goldraich, Heather Ross, Coleman Rotstein, Shahid Husain
BACKGROUND: Delays in diagnosing invasive pulmonary aspergillosis (IA), a significant cause of morbidity and mortality among heart transplant recipients (HTRs), may impact on successful treatment. The appropriate screening strategy for IA in these patients remains undefined, particularly in the setting of nosocomial outbreaks. We describe our experience employing chest computed tomography (CT) scans as a screening method for IA. In addition, we comment on antimicrobial prophylaxis in HTRs in the setting of an outbreak...
November 10, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/29124846/prevalence-mechanisms-and-genetic-relatedness-of-the-human-pathogenic-fungus-aspergillus-fumigatus-exhibiting-resistance-to-medical-azoles-in-the-environment-of-taiwan
#10
Hsuan-Chen Wang, Jui-Chang Huang, Yong-Hong Lin, Yu-Hsin Chen, Ming-I Hsieh, Pui-Ching Choi, Hsiu-Jung Lo, Wei-Lun Liu, Ching-Shan Hsu, Hsin-I Shih, Chi-Jung Wu, Yee-Chun Chen
Emerging azole resistance in Aspergillus fumigatus poses a serious threat to human health. This nationwide surveillance study investigated the prevalence and molecular characteristics of azole-resistant A. fumigatus environmental isolates in Taiwan, an island country with increasing use of azole fungicides. Of the 2,760 air and soil samples screened from 2014-2016, 451 A. fumigatus isolates were recovered from 266 samples, and 34 isolates from 29 samples displayed resistance to medical azoles (itraconazole, voriconazole, or posaconazole)...
November 10, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29121650/flavin-containing-monooxygenase-3-fmo3-role-in-busulphan-metabolic-pathway
#11
Ibrahim El-Serafi, Ylva Terelius, Manuchehr Abedi-Valugerdi, Seán Naughton, Maryam Saghafian, Ali Moshfegh, Jonas Mattsson, Zuzana Potácová, Moustapha Hassan
Busulphan (Bu) is an alkylating agent used in the conditioning regimen prior to hematopoietic stem cell transplantation (HSCT). Bu is extensively metabolized in the liver via conjugations with glutathione to form the intermediate metabolite (sulfonium ion) which subsequently is degraded to tetrahydrothiophene (THT). THT was reported to be oxidized forming THT-1-oxide that is further oxidized to sulfolane and finally 3-hydroxysulfolane. However, the underlying mechanisms for the formation of these metabolites remain poorly understood...
2017: PloS One
https://www.readbyqxmd.com/read/29121264/persistent-cns-toxicity-in-a-patient-receiving-posaconazole-tablets-after-discontinuation-of-voriconazole-due-to-supratherapeutic-serum-levels
#12
Farnaz Foolad, Dimitrios P Kontoyiannis
No abstract text is available yet for this article.
October 7, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29120502/necrotizing-microascus-tracheo-bronchitis-in-a-bilateral-lung-transplant-recipient
#13
Olivier Taton, Benjamin Bernier, Isabelle Etienne, Benjamin Bondue, Sophie Lecomte, Christiane Knoop, Frederique Jacob, Isabel Montesinos
Invasive fungal infections are a major cause of mortality among solid organ transplant recipients. Scopulariopsis species and their teleomorph Microascus are molds found in soil and decaying organic matter. We report here the case of a woman who underwent bilateral lung transplantation for severe emphysema. On day 25 after transplantation, endobronchial green-black lesions were detected during routine endoscopy. Endobronchial swabs, biopsies, and broncho-alveolar lavage samples were positive for Microascus cirrosus...
November 9, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/29112326/real-world-challenges-and-unmet-needs-in-the-diagnosis-and-treatment-of-suspected-invasive-pulmonary-aspergillosis-in-patients-with-hematological-diseases-an-illustrative-case-study
#14
Martin Hoenigl, Juergen Prattes, Peter Neumeister, Albert Wölfler, Robert Krause
Recent years have seen important advances in the diagnosis of invasive pulmonary aspergillosis (IPA), complemented by the introduction of new therapies. Despite this, IPA remains a major cause of infection-related mortality in patients with hematological diseases. There are two main reasons for this. First, diagnosis of IPA remains a challenge, since risk factors and the clinical, radiological and mycological presentations vary not only by fungal disease stage, but also by patient group (e.g. neutropenic versus non-neutropenic patients)...
November 7, 2017: Mycoses
https://www.readbyqxmd.com/read/29108709/update-on-actinomucor-elegans-a-mucormycete-infrequently-detected-in-human-specimens-how-combined-microbiological-tools-contribute-efficiently-to-a-more-accurate-medical-care
#15
J Dorin, M D'Aveni, A Debourgogne, M Cuenin, M Guillaso, A Rivier, P Gallet, G Lecoanet, M Machouart
Actinomucor elegans is a fungus belonging to mucormycetes and is still probably underdiagnosed due to misidentification. Based on a recent first case of Actinomucor elegans sinusitis in Europe, in an immunocompromised patient under voriconazole treatment, this paper aims to summarize knowledge about A. elegans mucormycoses. Even if the diagnosis of mucormycosis was made using traditional mycology techniques, precise identification of the fungus could only be achieved using molecular tools. In this observation, the galactomannan dosage was positive until the introduction of treatment and surgical debridement...
October 26, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29103728/short-communication-cold-atmospheric-plasma-inactivation-of-prototheca-zopfii-isolated-from-bovine-milk
#16
E Tyczkowska-Sieron, J Markiewicz, B Grzesiak, H Krukowski, A Glowacka, J Tyczkowski
Mastitis is a serious bovine diseases that can be caused by Prototheca zopfii, yeast-like algae belonging to the family Chlorellaceae. The substantial economic losses and health damage associated with bovine mastitis emphasize the need to develop effective strategies aimed at control of the infection. Unfortunately, P. zopfii is highly resistant to most common antibacterial and antifungal agents, as well as to heat treatment. We report here the first attempt to use cold atmospheric plasma to inactivate this pathogen...
November 2, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29102310/-vertebral-osteomyelitis-due-to-candida-tropicalis-secondary-to-candidemia-a-case-report
#17
S Zayet, I Chaabane, B Kilani, M Bouaziz, F Ladeb, H B Tiouiri
Candida spp. vertebral osteomyelitis is rare. Clinical presentation is unspecific. Diagnosis requires mycological culture of a biopsy specimen. Therapeutic management is based on prolonged course of azole or liposomal amphotericin B. We report the case of Candida tropicalis vertebral osteomyelitis with epidural involvement in a 27 years-old male patient, followed for S-β-thalassemia and with a history of candidemia. The fungus was isolated from a needle biopsy of the vertebral disk. The outcome was favorable under antifungal treatment by amphotericin B and voriconazole...
October 25, 2017: Journal de Mycologie Médicale
https://www.readbyqxmd.com/read/29074432/healthcare-workers-hands-as-a-vehicle-for-the-transmission-of-virulent-strains-of-candida-spp-a-virulence-factor-approach
#18
Karina Mayumi Sakita, Daniella Renata Faria, Eliane Martins da Silva, Flávia Kelly Tobaldini-Valério, Erika Seki Kioshima, Terezinha Inez Estivalet Svidzinski, Patricia de Souza Bonfim-Mendonça
BACKGROUND: Although the majority of Candida infections are thought to come from endogenous sources, the healthcare workers' (HCWs) hands are being increasingly reported as vehicles for the transmission of pathogens. The aim of the present study was to evaluate the susceptibility of yeast isolated from the HCWs' hands and ICU (Intensive Care Unit) surfaces to antifungal agents and to determine the virulence potential and the genetic similarity between the same. METHODS: The susceptibility of yeasts from the HCWs' hands (n = 57) and ICU surfaces (n = 98) to conventional antifungals (fluconazole, voriconazole, amphotericin B and micafungin) was evaluated using the broth microdilution assay accordance with CLSI M27-A3...
October 23, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29073536/intensive-care-unit-drug-costs-in-the-context-of-total-hospital-drug-expenditures-with-suggestions-for-targeted-cost-containment-efforts
#19
Shoroq M Altawalbeh, Melissa I Saul, Amy L Seybert, Joshua M Thorpe, Sandra L Kane-Gill
PURPOSE: To assess costs of intensive care unit (ICU) related pharmacotherapy relative to hospital drug expenditures, and to identify potential targets for cost-effectiveness investigations. We offer the unique advantage of comparing ICU drug costs with previously published data a decade earlier to describe changes over time. MATERIALS AND METHODS: Financial transactions for all ICU patients during fiscal years (FY) 2009-2012 were retrieved from the hospital's data repository...
October 19, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/29072765/the-cytochrome-b5-cybe-is-regulated-by-iron-availability-and-is-crucial-for-azole-resistance-in-a-fumigatus
#20
Matthias Misslinger, Fabio Gsaller, Peter Hortschansky, Christoph Müller, Franz Bracher, Michael J Bromley, Hubertus Haas
Cytochrome P450 enzymes (P450) play essential roles in redox metabolism in all domains of life including detoxification reactions and sterol biosynthesis. The activity of P450s is fuelled by two electron-transferring mechanisms, heme-independent P450 reductase (CPR) and the heme-dependent cytochrome b5 (CYB5)/cytochrome b5 reductase (CB5R) system. In this study, we characterised the role and regulation of the cytochrome b5 CybE in the fungal pathogen Aspergillus fumigatus. Deletion of the CybE encoding gene (cybE) caused a severe growth defect in two different A...
November 15, 2017: Metallomics: Integrated Biometal Science
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