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Candida drug resistance

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https://www.readbyqxmd.com/read/28814889/fluconazole-resistance-in-candida-species-a-current-perspective
#1
REVIEW
Elizabeth L Berkow, Shawn R Lockhart
Candida albicans and the emerging non-albicans Candida spp. have significant clinical relevance among many patient populations. Current treatment guidelines include fluconazole as a primary therapeutic option for the treatment of these infections, but it is only fungistatic against Candida spp. and both inherent and acquired resistance to fluconazole have been reported. Such mechanisms of resistance include increased drug efflux, alteration or increase in the drug target, and development of compensatory pathways for producing the target sterol, ergosterol...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28814823/relationship-between-the-antifungal-susceptibility-profile-and-the-production-of-virulence-related-hydrolytic-enzymes-in-brazilian-clinical-strains-of-candida-glabrata
#2
Maria Helena Galdino Figueiredo-Carvalho, Lívia de Souza Ramos, Leonardo Silva Barbedo, Jean Carlos Almeida de Oliveira, André Luis Souza Dos Santos, Rodrigo Almeida-Paes, Rosely Maria Zancopé-Oliveira
Candida glabrata is a facultative intracellular opportunistic fungal pathogen in human infections. Several virulence-associated attributes are involved in its pathogenesis, host-pathogen interactions, modulation of host immune defenses, and regulation of antifungal drug resistance. This study evaluated the in vitro antifungal susceptibility profile to five antifungal agents, the production of seven hydrolytic enzymes related to virulence, and the relationship between these phenotypes in 91 clinical strains of C...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28813144/stimulated-raman-imaging-reveals-aberrant-lipogenesis-as-a-meta-bolic-marker-for-azole-resistant-candida-albicans
#3
Caroline W Karanja, Weili Hong, Waleed Younis, Hassan E Eldesouky, Mohamed N Seleem, Ji-Xin Cheng
Candida albicans (C. albicans) is the single most prevalent cause of fungal bloodstream infections worldwide causing significant mortality as high as fifty percent. This high mortality rate is, in part, due to the inability to initiate an effective antifungal therapy early in the disease process. Mortality rates significantly increase after twelve hours of delay in initiating the appropriate antifungal therapy following a positive blood culture. Early administration of appropriate antifungal therapy is hampered by the slow turnovers of the conventional antimicrobial testing techniques, which require days of incubation...
August 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28810329/-distribution-and-drug-resistance-of-pathogens-at-hematology-department-of-jiangsu-province-from-2014-to-2015-results-from-a-multicenter-retrospective-study
#4
Y K Wan, W Sang, B Chen, Y G Yang, L Q Zhang, A N Sun, Y J Liu, Y Xu, Y P Cai, C B Wang, Y F Shen, Y W Jiang, X Y Zhang, W Xu, M Hong, T Chen, R R Xu, F Li, Y L Xu, Y Xue, Y L Lu, Z M He, W M Dong, Z Chen, M H Ji, Y Y Yang, L J Zhai, Y Zhao, G Q Wu, J H Ding, J Cheng, W B Cai, Y M Sun, J Ouyang
Objective: To describe the distribution and drug resistance of pathogens at hematology department of Jiangsu Province from 2014 to 2015 to provide reference for empirical anti-infection treatment. Methods: Pathogens were from hematology department of 26 tertiary hospitals in Jiangsu Province from 2014 to 2015. Antimicrobial susceptibility testing was carried out according to a unified protocol using Kirby-Bauer method or agar dilution method. Collection of drug susceptibility results and corresponding patient data were analyzed...
July 14, 2017: Zhonghua Xue Ye Xue za Zhi, Zhonghua Xueyexue Zazhi
https://www.readbyqxmd.com/read/28808688/adaptive-mistranslation-accelerates-the-evolution-of-fluconazole-resistance-and-induces-major-genomic-and-gene-expression-alterations-in-candida-albicans
#5
Tobias Weil, Rodrigo Santamaría, Wanseon Lee, Johan Rung, Noemi Tocci, Darren Abbey, Ana R Bezerra, Laura Carreto, Gabriela R Moura, Mónica Bayés, Ivo G Gut, Attila Csikasz-Nagy, Duccio Cavalieri, Judith Berman, Manuel A S Santos
Regulated erroneous protein translation (adaptive mistranslation) increases proteome diversity and produces advantageous phenotypic variability in the human pathogen Candida albicans. It also increases fitness in the presence of fluconazole, but the underlying molecular mechanism is not understood. To address this question, we evolved hypermistranslating and wild-type strains in the absence and presence of fluconazole and compared their fluconazole tolerance and resistance trajectories during evolution. The data show that mistranslation increases tolerance and accelerates the acquisition of resistance to fluconazole...
July 2017: MSphere
https://www.readbyqxmd.com/read/28807921/candida-albicans-swi-snf-and-mediator-complexes-differentially-regulate-mrr1-induced-mdr1-expression-and-fluconazole-resistance
#6
Zhongle Liu, Lawrence C Myers
Long-term azole treatment of patients with chronic Candida albicans infections can lead to drug resistance. Gain-of-function (GOF) mutations in the transcription factor Mrr1 and the consequent transcriptional activation of MDR1, a drug efflux coding gene, is a common pathway by which this human fungal pathogen acquires fluconazole resistance. This work elucidates the previously unknown downstream transcription mechanisms utilized by hyperactive Mrr1. We've identified the Swi/Snf chromatin remodeling complex as a key co-activator for Mrr1, which is required to maintain basal and induced 'open' chromatin, and Mrr1 occupancy, at the MDR1 promoter...
August 14, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28807920/mediator-tail-module-is-required-for-tac1-activated-cdr1-expression-and-azole-resistance-in-candida-albicans
#7
Zhongle Liu, Lawrence C Myers
The human fungal pathogen Candida albicans develops drug resistance after long-term exposure to azole drugs in the treatment of chronic candidiasis. Gain-of-function (GOF) mutations in the transcription factor Tac1, and the consequent expression of its targets, drug efflux pumps Cdr1 and Cdr2, are a common mechanism by which C. albicans acquires fluconazole resistance. The mechanism by which GOF mutations hyperactivate Tac1 is currently unknown. Here, we define a transcriptional activation domain (TAD) at the C-terminus of Tac1...
August 14, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28802152/comparison-and-analysis-of-the-structures-and-binding-modes-of-antifungal-se-and-cyp51-inhibitors
#8
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/28797969/bioactive-mesoporous-silica-nanostructures-with-anti-microbial-and-anti-biofilm-properties
#9
Paul Cătălin Balaure, Bianca Boarca, Roxana Cristina Popescu, Diana Savu, Roxana Trusca, Bogdan Ștefan Vasile, Alexandru Mihai Grumezescu, Alina Maria Holban, Alexandra Bolocan, Ecaterina Andronescu
The increasing rate of antibiotic resistant bacteria associated with nosocomial infections in severely ill patients has urged the need for new antibacterial therapies. Nanostructured materials represent emerging innovative approaches to controlled delivery of different antimicrobial drugs. Delivery systems encapsulating natural compounds with antibacterial effects, such as essential oils have shown a great potential. Herein we report the development of SiO2 mesoporous nanosystems loaded with eucalyptus (EUC), orange (ORA), and cinnamon (CIN) essential oils...
August 7, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28783748/heat-shock-protein-90-localizes-to-the-surface-and-augments-virulence-factors-of-cryptococcus-neoformans
#10
Sharanya Chatterjee, Utpal Tatu
BACKGROUND: Thermotolerance is an essential attribute for pathogenesis of Cryptococcus as exemplified by the fact that only two species in the genus, which can grow at 37°C, are human pathogens. Species which have other virulence factors including capsule formation and melanisation, but lack the ability to propagate at 37°C are not pathogenic. In another related fungal pathogen, Candida albicans, heat shock protein 90 has been implicated to be a central player in commanding pathogenicity by governing yeast to hyphal transition and drug resistance...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28781150/2016-guidelines-for-the-use-of-antifungal-agents-in-patients-with-invasive-fungal-diseases-in-taiwan
#11
REVIEW
Hsiang-Chi Kung, Po-Yen Huang, Wei-Ting Chen, Bor-Sheng Ko, Yee-Chun Chen, Shan-Chwen Chang, Yin-Ching Chuang
The Infectious Diseases Society of Taiwan, Medical Foundation in Memory of Dr. Deh-Lin Cheng, Foundation of Professor Wei-Chuan Hsieh for Infectious Diseases Research and Education, and CY Lee's Research Foundation for Pediatric Infectious Diseases and Vaccines have updated the guidelines for the use of antifungal agents in adult patients with invasive fungal diseases in Taiwan. This guideline replaces the 2009 version. Recommendations are provided for Candida, Cryptococcus, Aspergillus and Mucormycetes. The focus is based on up-to-date evidence on indications for treatment or prophylaxis of the most common clinical problems...
July 25, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28780413/thermo-and-ph-sensitive-hydrogel-membranes-composed-of-poly-n-isopropylacrylamide-hyaluronan-for-biomedical-applications-influence-of-hyaluronan-incorporation-on-the-membrane-properties
#12
Elbadawy A Kamoun, Alaa Fahmy, Tarek H Taha, Esmail M El-Fakharany, Mohamed Makram, Hesham M A Soliman, Hassan Shehata
Interpenetrating hydrogel membranes consisting of pH-sensitive hyaluronan (HA) and thermo-sensitive poly(N-isopropylacrylamide) (PNIPAAM) were synthesized using redox polymerization, followed by N,N-methylenebisacrylamide (BIS) and epichlorohydrin (EPI) were added as chemical crosslinkers. The interaction between membrane compositions has been characterized by FTIR spectroscopy and discussed intensively. The result indicates that HA incorporation in membranes increase the gel fraction, swelling uptake, and the flexibility/elasticity of crosslinked membranes, however it reduced oppositely the mechanical elongation of membranes...
August 2, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28774702/candida-and-invasive-mould-diseases-in-non-neutropenic-critically-ill-patients-and-patients-with-haematological-cancer
#13
REVIEW
A L Colombo, J N de Almeida Júnior, Monica A Slavin, Sharon C-A Chen, Tania C Sorrell
Critically ill patients and patients with haematological cancer are HIV-negative populations at high risk of invasive fungal infections. In intensive-care units, candidaemia and intra-abdominal candidiasis predominate, but aspergillosis has emerged as a lethal, under-recognised cause of pneumonia. In patients with haematological malignancies or who have undergone stem-cell transplantations, pulmonary disease due to aspergillus and other mould diseases predominate. In this Series paper, we provide an update on risk assessment, new diagnostic strategies, and therapeutic approaches...
July 31, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28774698/the-global-problem-of-antifungal-resistance-prevalence-mechanisms-and-management
#14
REVIEW
David S Perlin, Riina Rautemaa-Richardson, Ana Alastruey-Izquierdo
All serious fungal infections need appropriate antifungal therapy for successful patient outcome. Only a few classes of antifungal drugs are available, so the emergence of resistance to single drug classes and now multidrug resistance greatly hampers patient management. Azole resistance among Candida and Aspergillus species is one of the greatest challenges to clinical success, followed by echinocandin and multidrug resistance among some Candida species, especially Candida glabrata. The spread of agriculturally derived azole-resistant Aspergillus fumigatus and emerging threats such as multidrug resistant Candida auris are also alarming...
July 31, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28774360/-pathogen-distribution-risk-factors-and-outcomes-of-nosocomial-infection-in-very-premature-infants
#15
De-Shuang Zhang, Dong-Ke Xie, Na He, Wen-Bin Dong, Xiao-Ping Lei
OBJECTIVE: To study the pathogen distribution and risk factors of nosocomial infection in very preterm infants, as well as the risk of adverse outcomes. METHODS: A retrospective analysis was performed for the clinical data of 111 very preterm infants who were born between January and December, 2016 and had a gestational age of <32 weeks and a birth weight of <1 500 g. According to the presence or absence of nosocomial infection after 72 hours of hospitalization, the infants were divided into infection group and non-infection group...
August 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28758337/changes-in-the-distribution-of-colonising-and-infecting-candida-spp-isolates-antifungal-drug-consumption-and-susceptibility-in-a-french-intensive-care-unit-a-10-year-study
#16
Milène Sasso, Claire Roger, Magali Sasso, Hélène Poujol, Saber Barbar, Jean-Yves Lefrant, Laurence Lachaud
Monitoring fungal ecology and resistance to antifungal agents within intensive care units (ICU) is essential for the management of invasive fungal infections. Therefore, a retrospective descriptive study was carried in the ICU of Nimes University Hospital, France, from 2007 to 2016. As the majority of invasive fungal infections in ICU are caused by Candida species, the study objectives were to describe Candida species distribution, to assess candidaemia incidence and to monitor the antifungal drug susceptibility of Candida isolates and the consumption of antifungal agents...
July 31, 2017: Mycoses
https://www.readbyqxmd.com/read/28748029/prevalence-of-and-risk-factors-for-methicillin-resistant-staphylococcus-aureus-colonization-among-human-immunodeficient-virus-infected-outpatients-in-taiwan-oral-candida-colonization-as-a-comparator
#17
Chi-Jung Wu, Wen-Chien Ko, Mao-Wang Ho, Hsi-Hsun Lin, Yun-Liang Yang, Jiun-Nong Lin, I-Wen Huang, Hui-Ying Wang, Jui-Fen Lai, Yih-Ru Shiau, Li-Yun Hsieh, Hui-Ting Chen, Chih-Chao Lin, Wen-Li Chu, Hsiu-Jung Lo, Tsai-Ling Lauderdale
Human immuodeficency virus (HIV)-infected patients receiving highly active antiretroviral therapy (HAART) and community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) have increased in recent years in Taiwan. This study was undertaken to determine the prevalence of and risk factors for nasal and oral S. aureus and MRSA colonization among contemporary HIV-infected populations. Clinical variables for S. aureus and MRSA colonization among HIV-infected outpatients from three hospitals were analyzed and compared with those for oral Candida colonization...
2017: Journal of Oral Microbiology
https://www.readbyqxmd.com/read/28744261/antifungal-potential-of-copper-ii-manganese-ii-and-silver-i-1-10-phenanthroline-chelates-against-multidrug-resistant-fungal-species-forming-the-candida-haemulonii-complex-impact-on-the-planktonic-and-biofilm-lifestyles
#18
Rafael M Gandra, Pauraic Mc Carron, Mariana F Fernandes, Lívia S Ramos, Thaís P Mello, Ana Carolina Aor, Marta H Branquinha, Malachy McCann, Michael Devereux, André L S Santos
Candida haemulonii, Candida haemulonii var. vulnera and Candida duobushaemulonii, which form the C. haemulonii complex, are emerging etiologic agents of fungal infections known to be resistant to the most commonly used antifungals. The well-established anti-Candida potential of metal complexes containing 1,10-phenanthroline (phen) ligands encouraged us to evaluate different copper(II), manganese(II), and silver(I) phen chelates for their ability to inhibit planktonic growth and biofilm of C. haemulonii species complex...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28743811/structural-and-in-vivo-studies-on-trehalose-6-phosphate-synthase-from-pathogenic-fungi-provide-insights-into-its-catalytic-mechanism-biological-necessity-and-potential-for-novel-antifungal-drug-design
#19
Yi Miao, Jennifer L Tenor, Dena L Toffaletti, Stacey A Maskarinec, Jiuyu Liu, Richard E Lee, John R Perfect, Richard G Brennan
The disaccharide trehalose is critical to the survival of pathogenic fungi in their human host. Trehalose-6-phosphate synthase (Tps1) catalyzes the first step of trehalose biosynthesis in fungi. Here, we report the first structures of eukaryotic Tps1s in complex with substrates or substrate analogues. The overall structures of Tps1 from Candida albicans and Aspergillus fumigatus are essentially identical and reveal N- and C-terminal Rossmann fold domains that form the glucose-6-phosphate and UDP-glucose substrate binding sites, respectively...
July 25, 2017: MBio
https://www.readbyqxmd.com/read/28739790/a-cationic-polymer-that-shows-high-antifungal-activity-against-diverse-human-pathogens
#20
Leslie A Rank, Naomi M Walsh, Runhui Liu, Fang Yun Lim, Jin Woo Bok, Mingwei Huang, Nancy P Keller, Samuel H Gellman, Christina M Hull
Invasive fungal diseases are generally difficult to treat and often fatal. The therapeutic agents available to treat fungi are limited, and there is a critical need for new agents to combat these deadly infections. Antifungal compound development has been hindered by the challenge of creating agents that are highly active against fungal pathogens but not toxic to the host. Host-defense peptides (HDPs) are produced by eukaryotes as a component of the innate immune response to pathogens and have served as inspiration for the development of many new antibacterial compounds...
July 24, 2017: Antimicrobial Agents and Chemotherapy
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