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Candida antifungal resistance

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https://www.readbyqxmd.com/read/29789366/loss-of-upc2p-inducible-erg3-transcription-is-sufficient-to-confer-niche-specific-azole-resistance-without-compromising-candida-albicans-pathogenicity
#1
Arturo Luna-Tapia, Hubertine M E Willems, Josie E Parker, Hélène Tournu, Katherine S Barker, Andrew T Nishimoto, P David Rogers, Steven L Kelly, Brian M Peters, Glen E Palmer
Inactivation of sterol Δ5,6 -desaturase (Erg3p) in the prevalent fungal pathogen Candida albicans is one of several mechanisms that can confer resistance to the azole antifungal drugs. However, loss of Erg3p activity is also associated with deficiencies in stress tolerance, invasive hyphal growth, and attenuated virulence in a mouse model of disseminated infection. This may explain why relatively few erg3 -deficient strains have been reported among azole-resistant clinical isolates. In this study, we examined the consequences of Erg3p inactivation upon C...
May 22, 2018: MBio
https://www.readbyqxmd.com/read/29788045/molecular-epidemiology-of-candida-auris-in-colombia-reveals-a-highly-related-country-wide-colonization-with-regional-patterns-in-amphotericin-b-resistance
#2
Patricia Escandón, Nancy A Chow, Diego H Caceres, Lalitha Gade, Elizabeth L Berkow, Paige Armstrong, Sandra Rivera, Elizabeth Misas, Carolina Duarte, Heather Moulton-Meissner, Rory M Welsh, Claudia Parra, Luz Angela Pescador, Nohora Villalobos, Soraya Salcedo, Indira Berrio, Carmen Varón, Andrés Espinosa-Bode, Shawn R Lockhart, Brendan R Jackson, Anastasia P Litvintseva, Mauricio Beltran, Tom M Chiller
Background: Candida auris is a multidrug-resistant yeast associated with hospital outbreaks worldwide. During 2015-2016, multiple outbreaks were reported in Colombia. We aimed to understand the extent of contamination in healthcare settings and to characterize the molecular epidemiology of C. auris in Colombia. Methods: We sampled patients, patient contacts, healthcare workers, and the environment in four hospitals with recent C. auris outbreaks. Using standardized protocols, people were swabbed at different body sites...
May 16, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29784839/clonal-spread-in-candida-glabrata-bloodstream-isolates-and-fluconazole-resistance-affected-by-prolonged-exposure-a-12-year-single-center-study-in-belgium
#3
Berdieke Goemaere, Katrien Lagrou, Isabel Spriet, Marijke Hendrickx, Pierre Becker
Candida glabrata is a major cause of candidemia in immunocompromised patients and is characterized by a high-level of fluconazole resistance. In the present study, acquisition of antifungal resistance and potential clonal spread of C. glabrata were explored at a single center over a 12-year period by analyzing 187 independent clinical C. glabrata bloodstream isolates. One strain was found to be micafungin resistant due to a mutation in the FKS2 gene. Fluconazole resistance remained stable throughout the period and was observed in 20 (10...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29783771/adhesins-in-candida-glabrata
#4
REVIEW
Bea Timmermans, Alejandro De Las Peñas, Irene Castaño, Patrick Van Dijck
The human fungal pathogen Candida glabrata is causing more and more problems in hospitals, as this species shows an intrinsic antifungal drug resistance or rapidly becomes resistant when challenged with antifungals. C. glabrata only grows in the yeast form, so it is lacking a yeast-to-hyphae switch, which is one of the main virulence factors of C. albicans . An important virulence factor of C. glabrata is its capacity to strongly adhere to many different substrates. To achieve this, C. glabrata expresses a large number of adhesin-encoding genes and genome comparisons with closely related species, including the non-pathogenic S...
May 20, 2018: Journal of Fungi (Basel, Switzerland)
https://www.readbyqxmd.com/read/29778961/uva-induced-antimicrobial-activity-of-zno-ag-nanocomposite-covered-surfaces
#5
Meeri Visnapuu, Merilin Rosenberg, Egle Truska, Ergo Nõmmiste, Andris Šutka, Anne Kahru, Mihkel Rähn, Heiki Vija, Kaja Orupõld, Vambola Kisand, Angela Ivask
Application of efficient antimicrobial surfaces has been estimated to decrease both, the healthcare-associated infections and the spread of antibiotic-resistant bacteria. In this paper, we prepared ZnO and ZnO/Ag nanoparticle covered surfaces and evaluated their antimicrobial efficacy towards a Gram-negative bacterial model (Escherichia coli), a Gram-positive bacterial model (Staphylococcus aureus) and a fungal model (Candida albicans) in the dark and under UVA illumination. The surfaces were prepared by spin coating aliquots of ZnO and ZnO/Ag nanoparticle suspensions onto glass substrates...
May 4, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29777096/the-first-isolate-of-candida-auris-in-china-clinical-and-biological-aspects
#6
Xiaojuan Wang, Jian Bing, Qiushi Zheng, Feifei Zhang, Jingbo Liu, Huizhen Yue, Li Tao, Han Du, Yina Wang, Hui Wang, Guanghua Huang
The emerging human fungal pathogen Candida auris has been recognized as a multidrug resistant species and is associated with high mortality. This fungus was first described in Japan in 2009 and has been reported in at least 18 countries on five continents. In this study, we report the first isolate of C. auris from the bronchoalveolar lavage fluid (BALF) of a hospitalized woman in China. Interestingly, this isolate is susceptible to all tested antifungals including amphotericin B, fluconazole, and caspofungin...
May 18, 2018: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/29770082/first-reported-case-of-multidrug-resistant-candida-auris-in-canada
#7
I S Schwartz, G W Hammond
Candida auris is a fungal pathogen that has recently emerged as a global threat to public health. It was first described in Japan in 2009 and has since been reported in 17 countries on five continents. This case report describes the first reported case of multidrug-resistant C. auris in Canada. In May 2017, a 64-year-old individual was evaluated for chronic otitis externa. Past medical history included a recent hospitalization in India for elective oral surgery that was complicated by an odontogenic brain abscess...
July 6, 2017: Canada Communicable Disease Report, Relevé des Maladies Transmissibles Au Canada
https://www.readbyqxmd.com/read/29767615/relevance-of-antifungal-penetration-in-biofilm-associated-resistance-of-candida-albicans-and-non-albicans-candida-species
#8
Rachna Singh, Anjna Kumari, Karminder Kaur, Parul Sethi, Arunaloke Chakrabarti
The role of penetration limitation in Candida biofilm-associated antifungal resistance remains unclear. Most of the previous work has been done on Candida albicans, although non-albicans (NAC) species are also implicated in invasive candidiasis and the biofilm matrix has been shown to vary amongst different species. Only a few studies have evaluated clinical isolates. This study aimed to determine the relevance of penetration limitation in the antifungal resistance of biofilms formed by C. albicans and NAC clinical isolates, using an agar disk diffusion assay...
May 16, 2018: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29766800/antifungal-activity-gas-chromatographic-mass-spectrometric-analysis-and-in-silico-study-of-punica-granatum-peel-extracts-against-fluconazole-resistant-strains-of-candida-species
#9
Sony Paul, M Kalyani, I Kannan
AIMS: Candida species is the common cause of opportunistic fungal infections all over the world with increased mortality and morbidity especially in immunosuppressed patients. Fluconazole is the first line therapy for candidiasis. The antifungal resistance pattern in high-risk patients is a major concern. The present study was aimed to assess the anticandidal activity of Punica granatum peel against fluconazole resistant Candida species isolated from HIV patients. MATERIALS & METHODS: Ethanol, chloroform, petroleum ether and aqueous extracts of the peel of P...
May 14, 2018: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/29762860/new-pathogens-new-tricks-emerging-drug-resistant-fungal-pathogens-and-future-prospects-for-antifungal-therapeutics
#10
REVIEW
Jennifer Geddes-McAlister, Rebecca S Shapiro
Fungal pathogens are a growing threat to public health. As human immunodeficiency becomes increasingly common, fungal infections are becoming more prevalent. The use of antifungal agents for prophylaxis and treatment of fungal infections has favored the emergence of previously rare or unidentified species of drug-resistant fungal pathogens, including several Candida and Cryptococcus species, as well as mold pathogens. As these new and increasingly drug-resistant fungal pathogens continue to emerge, novel strategies for rapid identification and treatment are necessary to combat these life-threatening infections...
May 15, 2018: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/29762783/repurposing-the-anthelminthic-salicylanilide-oxyclozanide-against-susceptible-and-clinical-resistant-candida-albicans-strains
#11
Emilie Pic, Anaïs Burgain, Adnane Sellam
Current antifungal drugs suffer from limitations including toxicity, adverse interactions with other commonly prescribed drugs, and the emergence of resistant strains. Here, we repurposed the anthelmintic oxyclozanide as a potent antifungal agent against both sensitive and resistant clinical isolates of Candida albicans, as well as other human opportunistic fungi. Antifungal activity of oxyclozanide was enhanced when C. albicans grew in nonfermentable carbon sources. Our data support a mechanism of action where oxyclozanide uncoupled the mitochondrial electron transport from oxidative phosphorylation and perturbed the mitochondrial membrane potential...
May 14, 2018: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/29760684/bioprospecting-deep-sea-actinobacteria-for-novel-anti-infective-natural-products
#12
Dongbo Xu, Linna Han, Chunhui Li, Qi Cao, Duolong Zhu, Nolan H Barrett, Dedra Harmody, Jing Chen, Haining Zhu, Peter J McCarthy, Xingmin Sun, Guojun Wang
The global prevalence of drug resistance has created an urgent need for the discovery of novel anti-infective drugs. The major source of antibiotics in current clinical practice is terrestrial actinobacteria; the less-exploited deep-sea actinobacteria may serve as an unprecedented source of novel natural products. In this study, we evaluated 50 actinobacteria strains derived from diverse deep water sponges and environmental niches for their anti-microbial activities against a panel of pathogens including Candida albicans , Clostridium difficile , Staphylococcus aureus , and methicillin-resistant S...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29760550/synergistic-antifungal-effect-of-chitosan-stabilized-selenium-nanoparticles-synthesized-by-pulsed-laser-ablation-in-liquids-against-candida-albicans-biofilms
#13
Humberto H Lara, Gregory Guisbiers, Jonathan Mendoza, Lawrence C Mimun, Brandy A Vincent, Jose L Lopez-Ribot, Kelly L Nash
Background: Candida albicans is a major opportunistic fungal pathogen. One of the most important virulence factors that contribute to the pathogenesis of candidiasis is its ability to form biofilms. A key characteristic of Candida biofilms is their resistance to antifungal agents. Due to significant morbidity and mortality rates related to biofilm-associated drug resistance, there is an urgency to develop novel nanotechnology-based approaches preventing biofilm-related infections. Methods: In this study, we report, for the first time, the synthesis of selenium nanoparticles by irradiating selenium pellets by nanosecond pulsed laser ablation in liquid chitosan as a capping agent...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29760548/silver-nanoparticles-induced-alterations-in-multiple-cellular-targets-which-are-critical-for-drug-susceptibilities-and-pathogenicity-in-fungal-pathogen-candida-albicans
#14
Venkatraman Srinivasan Radhakrishnan, Mohana Krishna Reddy Mudiam, Manish Kumar, Surya Prakash Dwivedi, Surinder Pal Singh, Tulika Prasad
Purpose: A significant increase in the incidence of fungal infections and drug resistance has been observed in the past decades due to limited availability of broad-spectrum antifungal drugs. Nanomedicines have shown significant antimicrobial potential against various drug-resistant microbes. Silver nanoparticles (AgNps) are known for their antimicrobial properties and lower host toxicity; however, for clinical applications, evaluation of their impact at cellular and molecular levels is essential...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29755472/the-elusive-anti-candida-vaccine-lessons-from-the-past-and-opportunities-for-the-future
#15
REVIEW
Gloria Hoi Wan Tso, Jose Antonio Reales-Calderon, Norman Pavelka
Candidemia is a bloodstream fungal infection caused by Candida species and is most commonly observed in hospitalized patients. Even with proper antifungal drug treatment, mortality rates remain high at 40-50%. Therefore, prophylactic or preemptive antifungal medications are currently recommended in order to prevent infections in high-risk patients. Moreover, the majority of women experience at least one episode of vulvovaginal candidiasis (VVC) throughout their lifetime and many of them suffer from recurrent VVC (RVVC) with frequent relapses for the rest of their lives...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29755350/extracts-from-hypericum-hircinum-subsp-majus-exert-antifungal-activity-against-a-panel-of-sensitive-and-drug-resistant-clinical-strains
#16
Noemi Tocci, Daniele Perenzoni, Duilio Iamonico, Francesca Fava, Tobias Weil, Fulvio Mattivi
During the last two decades incidences of fungal infections dramatically increased and the often accompanying failure of available antifungal therapies represents a substantial clinical problem. The urgent need for novel antimycotics called particular attention to the study of natural products. The genus Hypericum includes many species that are used in the traditional medicine to treat pathological states like inflammations and infections caused by fungi. However, despite the diffused use of Hypericum -based products the antifungal potential of the genus is still poorly investigated...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29749387/invasive-candidiasis
#17
REVIEW
Peter G Pappas, Michail S Lionakis, Maiken Cavling Arendrup, Luis Ostrosky-Zeichner, Bart Jan Kullberg
Invasive candidiasis is an important health-care-associated fungal infection that can be caused by several Candida spp.; the most common species is Candida albicans, but the prevalence of these organisms varies considerably depending on geographical location. The spectrum of disease of invasive candidiasis ranges from minimally symptomatic candidaemia to fulminant sepsis with an associated mortality exceeding 70%. Candida spp. are common commensal organisms in the skin and gut microbiota, and disruptions in the cutaneous and gastrointestinal barriers (for example, owing to gastrointestinal perforation) promote invasive disease...
May 11, 2018: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/29747400/in-vitro-anticandidal-activity-and-mechanism-of-a-polyoxovanadate-functionalized-by-zn-fluconazole-complexes
#18
Shuanli Guo, Wei Yang, Mingming Zhao, Rui Tian, Boyu Zhang, Yanfei Qi
The rise in the number of fungal infections is requiring the rapid development of novel antifungal agents. A new polyoxovanadate functionalized by Zn-fluconazole coordination complexes, Zn₃(FLC)₆V10 O28 ·10H₂O (ZnFLC) (FLC = fluconazole) has been synthesized and evaluated for in vitro antifungal against Candida species. The identity of ZnFLC were confirmed by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The antifungal activities of ZnFLC was screened in 19 Candida species strains using the microdilution checkerboard technique...
May 9, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29746162/antifungal-activity-of-essential-oils-against-azole-resistant-and-azole-susceptible-i-i-candida-glabrata-i-i-strains-vaginal-isolates
#19
Nadia Massa, Simone Cantamessa, Giorgia Novello, Elia Ranzato, Simona Martinotti, Matteo Pavan, Andrea Rocchetti, Graziella Berta, Elisa Gamalero, Elisa Bona
<i></i>Candida glabrata<i></i> is an opportunistic pathogen, associated with endocarditis, meningitis and disseminated disease and also with complicated vaginitis. Essential oils derived from aromatic plants are known in traditional medicine as antimicrobial agents and have antifungal properties. The aim of this work was to evaluate whether the twelve tested essential oils (tea tree, laurel, anise, basil, bergamot, lavender, mint, oregano, grapefruit, rosemary, winter savory and ginger) could have a transverse effect on <i></i>C...
May 10, 2018: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/29743305/five-year-national-surveillance-of-invasive-candidiasis-species-distribution-and-azole-susceptibility-from-the-china-hospital-invasive-fungal-surveillance-net-chif-net-study
#20
Meng Xiao, Zi-Yong Sun, Mei Kang, Da-Wen Guo, Kang Liao, Sharon C-A Chen, Fanrong Kong, Xin Fan, Jing-Wei Cheng, Xin Hou, Meng-Lan Zhou, Ying Li, Shu-Ying Yu, Jing-Jing Huang, He Wang, Ying-Chun Xu
Data on the epidemiology of invasive candidiasis (IC) and antifungal susceptibility of Candida isolates in China are still limited. Here we report surveillance for IC from the China Hospital Invasive Fungal Surveillance Net (CHIF-NET) Study. Sixty-five tertiary hospitals collected 8,829 Candida isolates from August 1, 2009 to July 31, 2014. Matrix-assisted laser desorption/ionization -time of flight mass spectrometry supplemented by rDNA sequencing was used to define species, and fluconazole and voriconazole susceptibilities determined by the Clinical and Laboratory Standards Institute disk diffusion method...
May 9, 2018: Journal of Clinical Microbiology
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