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Candida antifungal resistance

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https://www.readbyqxmd.com/read/29346584/in-vitro-interactions-between-iap-antagonist-at406-and-azoles-against-planktonic-cells-and-biofilms-of-pathogenic-fungi-candida-albicans-and-exophiala-dermatitidis
#1
Yi Sun, Lujuan Gao, Chengyan He, Ming Li, Tongxiang Zeng
In vitro interactions of AT406, a novel IAP antagonist, and azoles including itraconazole, voriconazole, and fluconazole against planktonic cells and biofilms of Candida albicans and Exophiala dermatitidis were assessed via broth microdilution checkerboard technique. AT406 alone exhibited limited antifungal activity. However, synergistic effect between AT406 and fluconazole was observed against both planktonic cells and biofilms of C. albicans, including one fluconazole-resistant strain. Moreover, synergism was also demonstrated between AT406 and itraconazole against both planktonic cells and biofilms of E...
January 13, 2018: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/29346561/floricolin-c-elicits-intracellular-ros-accumulation-and-disrupts-mitochondria-to-exert-fungicidal-action
#2
Ming Zhang, Wenqiang Chang, Hongzhuo Shi, Ying Li, Sha Zheng, Wei Li, Hongxiang Lou
Candida albicans, one most prevalent fungal pathogen, causes severe mucosal and invasive infections in predisposed individuals. The rise of fungal infection and drug-resistance demands the development of novel antifungal agents. In this study, we observed that floricolin C (FC), a p-terphenyl pigment from an endolichenic fungus, killed C. albicans cells at planktonic state or within biofilms through reactive oxygen species (ROS) accumulation. Further test revealed that FC could directly damage the mitochondria to cause ROS accumulation...
January 15, 2018: FEMS Yeast Research
https://www.readbyqxmd.com/read/29340465/variability-in-the-clinical-distributions-of-candida-species-and-the-emergence-of-azole-resistant-non-candida-albicans-species-in-public-hospitals-in-the-midwest-region-of-brazil
#3
Karine Mattos, Luana Carbonera Rodrigues, Kelly Mari Pires de Oliveira, Pedro Fernando Diniz, Luiza Inahê Marques, Adriana Almeida Araujo, Marilene Rodrigues Chang
INTRODUCTION: Incidence and antifungal susceptibility of Candida spp. from two teaching public hospitals are described. METHODS: The minimum inhibitory concentrations of fluconazole, voriconazole, itraconazole, and amphotericin B were determined using Clinical Laboratory Standard Institute broth microdilution and genomic differentiation using PCR. RESULTS: Of 221 Candida isolates, 50.2% were obtained from intensive care unit patients; 71.5% were recovered from urine and 9...
November 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29325916/proanthocyanidin-polymeric-tannins-from-stryphnodendron-adstringens-are-effective-against-fluconazole-resistant-candida-spp-and-treat-vaginal-candidiasis
#4
Aline Luiza Duarte de Freitas, Vanessa Kaplum, Diego Conrado Pereira Rossi, Leandro Buffoni Roque da Silva, Márcia de Souza Carvalho Melhem, Carlos Pelleschi Taborda, João Carlos Palazzo de Mello, Celso Vataru Nakamura, Kelly Ishida
ETHNOPHARMACOLOGICAL RELEVANCE: The stem bark of Stryphnodendron adstringens (Mart.) Coville is popularly used as anti-inflammatory, astringent and in the treatment of wounds and vaginal infections. Several pharmacological activities have been scientifically proven by "in vitro" and "in vivo" experimental assays for antibacterial, antiviral, antiprotozoan, anti-inflammatory and antioxidant. AIM OF THE STUDY: We investigated whether proanthocyanidin polymeric tannins from the Stryphnodendron adstringens steam bark with antifungal activity against Candida albicans in vitro are also active against planktonic and biofilm cells of Candida non-albicans (CNA, including fluconazole-resistant isolates) and are capable of controlling Candida vaginitis in vivo...
January 8, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29325167/a-multicentre-study-of-antifungal-susceptibility-patterns-among-350-candida-auris-isolates-2009-17-in-india-role-of-the-erg11-and-fks1-genes-in-azole-and-echinocandin-resistance
#5
Anuradha Chowdhary, Anupam Prakash, Cheshta Sharma, Milena Kordalewska, Anil Kumar, Smita Sarma, Bansidhar Tarai, Ashutosh Singh, Gargi Upadhyaya, Shalini Upadhyay, Priyanka Yadav, Pradeep K Singh, Vikas Khillan, Neelam Sachdeva, David S Perlin, Jacques F Meis
Background: Candida auris has emerged globally as an MDR nosocomial pathogen in ICU patients. Objectives: We studied the antifungal susceptibility of C. auris isolates (n = 350) from 10 hospitals in India collected over a period of 8 years. To investigate azole resistance, ERG11 gene sequencing and expression profiling was conducted. In addition, echinocandin resistance linked to mutations in the C. auris FKS1 gene was analysed. Methods: CLSI antifungal susceptibility testing of six azoles, amphotericin B, three echinocandins, terbinafine, 5-flucytosine and nystatin was conducted...
January 9, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29324336/new-1-5-and-2-5-disubstituted-tetrazoles-dependent-activity-towards-surface-barrier-of-candida-albicans
#6
Monika Staniszewska, Małgorzata Gizińska, Ewa Mikulak, Klaudia Adamus, Mirosława Koronkiewicz, Edyta Łukowska-Chojnacka
A series of novel tetrazole derivatives was synthetized using N-alkylation or Michael-type addition reactions, and screened for their fungistatic potential against Candida albicans (the lack of endpoint = 100%). Among them, the selected compounds 2d, 4b, and 6a differing in substituents at the tetrazole ring were non-toxic to Galleria mellonella larvae in vivo and exerted slight toxicity against Caco-2 in vitro (CC50 at 256 μg/mL). An antagonistic effect of tetrazole derivatives 2d, 4b, and 6a respectively in combination with Fluconazole was shown using the checker board and colorimetric methods (fractional inhibitory concentration indexes FICIs >1)...
December 30, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29322651/antifungal-dipeptides-incorporating-an-inhibitor-of-homoserine-dehydrogenase
#7
Andrzej S Skwarecki, Marta Schielmann, Dorota Martynow, Marcin Kawczyński, Aleksandra Wiśniewska, Maria J Milewska, Sławomir Milewski
The antifungal activity of 5-hydroxy-4-oxo-l-norvaline (HONV), exhibited under conditions mimicking human serum, may be improved upon incorporation of this amino acid into a dipeptide structure. Several HONV-containing dipeptides inhibited growth of human pathogenic yeasts of the Candida genus in the RPMI-1640 medium, with minimal inhibitory concentration values in the 32 to 64 μg mL-1 range. This activity was not affected by multidrug resistance that is caused by overexpression of genes encoding drug efflux proteins...
January 2018: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/29318401/synthesis-anti-microbial-activity-cytotoxicity-of-some-novel-substituted-5-3-1h-benzo-d-imidazol-2-yl-4-hydroxybenzyl-benzofuran-2-yl-phenyl-methanone-analogs
#8
Bhookya Shankar, Pochampally Jalapathi, Balabadra Saikrishna, Shaym Perugu, Vijjulatha Manga
BACKGROUND: There is a dire need for the discovery and development of new antimicrobial agents after several experiments for a better resistance of microorganisms towards antimicrobial agents become a serious health problem for a few years in the past. As benzimidazole possess various types of biological activities, it has been synthesized, in the present study, a new series of (5-(3-(1H-benzo[d]imidazol-2-yl)-4-hydroxybenzyl)benzofuran-2-yl)(phenyl)methanone analogs by using the condensation and screened for its in vitro antimicrobial activity and cytotoxicity...
January 9, 2018: Chemistry Central Journal
https://www.readbyqxmd.com/read/29316739/development-of-candida-albicans-biofilms-is-diminished-by-paeonia-lactiflora-through-obstruction-of-cell-adhesionand-cell-lysis
#9
Heung-Shick Lee, Younhee Kim
Candida albicans infections are problematic to treat often due to antifungal resistance, since most infections of the pathogen are associated with biofilms. The abilities of C. albicans to switch from budding yeast to filamentous hyphae, and adhere to host cells or various surfaces support biofilm formation. We previously reported that the ethanol extract from Paeonia lactiflora not only inhibits cell wall synthesis but also causes depolarization and permeabilization of cell membrane in C. albicans. In this study, we found that the P...
January 11, 2018: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29316713/fungicidal-pmma-undecylenic-acid-composites
#10
Milica Petrović, Debora Bonvin, Heinrich Hofmann, Marijana Mionić Ebersold
Undecylenic acid (UA), known as antifungal agent, still cannot be used to efficiently modify commercial dental materials in such a way that this affects Candida. Actually, issues with Candida infections and fungal resistance compromise the use of Poly(methyl-methacrylate) (PMMA) as dental material. The challenge remains to turn PMMA into an antifugal material, which can ideally affect both sessile (attached) and planktonic (free-floating) Candida cells. We aimed to tackle this challenge by designing PMMA-UA composites with different UA concentrations (3-12%)...
January 8, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29314280/fabrication-of-silver-chloride-nanoparticles-using-a-plant-serine-protease-in-combination-with-photo-activation-and-investigation-of-their-biological-activities
#11
Jaruwan Siritapetawee, Wanwisa Limphirat, Nawarat Nantapong, Dujdow Songthamwat
Recently, the development of 'green' methods for fabrication of silver nanoparticles (Ag-NPs) has been emphasized, in view of their environmental safety, feasibility and low cost. In this study, a serine protease, EuP-82 from Euphorbia cf. lactea latex, was used to fabricate silver chloride nanoparticles (AgCl-NPs) in phosphate-buffered saline (pH 7.2), under the influence of visible light. The fabricated nanoparticles had a maximal surface plasmon resonance absorption peak at 435 nm. The size of the AgCl-NPs, estimated by scanning electron microscopy, was 57 ± 14...
January 3, 2018: Biotechnology and Applied Biochemistry
https://www.readbyqxmd.com/read/29311085/the-rim-pathway-mediates-antifungal-tolerance-in-candida-albicans-through-newly-identified-rim101-transcriptional-targets-including-hsp90-and-ipt1
#12
Cécile Garnaud, Encar García-Oliver, Yan Wang, Danièle Maubon, Sébastien Bailly, Quentin Despinasse, Morgane Champleboux, Jérôme Govin, Muriel Cornet
Invasive candidiasis (IC) is a major cause of morbidity and mortality despite antifungal treatment. Azoles and echinocandins are used as first-line therapies in IC. However, their efficacy is limited by yeast tolerance and the emergence of acquired resistance. Tolerance is a reversible stage due to the yeast's capacity to counter the antifungal drug exposure, leading to persistent growth. In C. albicans, multiple stress signaling pathways have been shown to contribute to this adaptation. Among those, the Rim pH-responsive pathway, through its transcription factor Rim101p, was shown to mediate azole and echinocandin tolerance...
January 8, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29311082/deletion-of-ada2-increases-antifungal-drug-susceptibility-and-virulence-in-candida-glabrata
#13
Shang-Jie Yu, Ya-Lin Chang, Ying-Lien Chen
Candida glabrata, the second most frequent cause of candidiasis after Candida albicans, is an emerging human fungal pathogen that is intrinsically drug tolerant. Currently, studies of C. glabrata genes involved in drug tolerance are limited. Ada2, a component serving as a transcription adaptor of the Spt-Ada-Gcn5 acetyltransferase (SAGA) complex, is required for antifungal drug tolerance and virulence in C. albicans However, its roles in C. glabrata remain elusive. In this study, we found that ada2 mutants demonstrated severe growth defects at 40°C but only mild defects at 37°C or 25°C...
January 8, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29311065/in-vitro-and-in-vivo-evaluation-of-the-antifungal-activity-of-apx001a-apx001-against-candida-auris
#14
Christopher L Hager, Emily L Larkin, Lisa Long, Fatima Z Abidi, Karen J Shaw, Mahmoud A Ghannoum
Candida auris is an emerging multidrug-resistant yeast that has been responsible for invasive infections associated with high morbidity and mortality. C. auris strains often demonstrate high fluconazole and amphotericin B minimum inhibitory concentration values, and some strains are resistant to all 3 major antifungal classes. Here we evaluated the susceptibility of 16 C. auris clinical strains, isolated from a wide geographical area, to 10 antifungal agents including APX001A, a novel agent that inhibits the fungal protein Gwt1 (GPI-anchored wall transfer protein 1)...
January 8, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29311063/mutant-prevention-concentration-and-mutant-selection-window-of-micafungin-and-anidulafungin-in-clinical-candida-glabrata-isolates
#15
María Ángeles Bordallo-Cardona, Laura Judith Marcos-Zambrano, Carlos Sánchez-Carrillo, Elia Gómez G de la Pedrosa, Rafael Cantón, Emilio Bouza, Pilar Escribano, Jesús Guinea
Background: We report the mutant prevention concentration (MPC) and mutant selection window (MSW) for micafungin and anidulafungin administered to treat Candida glabrata We also determine the mutation frequency.Methods: We studied 20 echinocandin-susceptible, fluconazole-intermediate, and FKS wild-type C. glabrata isolates. Adjusted inocula were stroked directly onto Sabouraud agar plates containing different concentrations of micafungin or anidulafungin and visually inspected daily for up to 5 days of incubation...
January 8, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29311061/enhanced-efflux-pump-activity-in-old-candida-glabrata
#16
Somanon Bhattacharya, Bettina C Fries
The effect of replicative aging on antifungal resistance in Candida glabrata was investigated. Our studies demonstrate significantly increased transcription of ABC transporters as well as efflux pump activity in old compared to young C. glabrata cells of a fluconazole sensitive and resistant strain. In addition, higher tolerance to killing by micafungin and amphotericin B was noted and is associated with higher transcription of glucan synthase gene FKS1 and lower ergosterol content in older cells.
January 8, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29310582/identification-of-uncommon-oral-yeasts-from-cancer-patients-by-maldi-tof-mass-spectrometry
#17
Narges Aslani, Ghasem Janbabaei, Mahdi Abastabar, Jacques F Meis, Mahasti Babaeian, Sadegh Khodavaisy, Teun Boekhout, Hamid Badali
BACKGROUND: Opportunistic infections due to Candida species occur frequently in cancer patients because of their inherent immunosuppression. The aim of the present study was to investigate the epidemiology of yeast species from the oral cavity of patients during treatment for oncological and haematological malignancies. METHODS: MALDI-TOF was performed to identify yeasts isolated from the oral cavity of 350 cancer patients. Moreover, antifungal susceptibility testing was performed in according to CLSI guidelines (M27-A3)...
January 8, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29305296/one-step-synthesis-of-carbohydrate-esters-as-antibacterial-and-antifungal-agents
#18
Madher N AlFindee, Qian Zhang, Yagya Prasad Subedi, Jaya P Shrestha, Yukie Kawasaki, Michelle Grilley, Jon Y Takemoto, Cheng-Wei Tom Chang
Carbohydrate esters are biodegradable, and the degraded adducts are naturally occurring carbohydrates and fatty acids which are environmentally friendly and non-toxic to human. A simple one-step regioselective acylation of mono-carbohydrates has been developed that leads to the synthesis of a wide range of carbohydrate esters. Screening of these acylated carbohydrates revealed that several compounds were active against a panel of bacteria and fungi, including Staphylococcus aureus, methicillin-resistant S. aureus (MRSA), Candida albicans, Cryptococcus neoformans, Aspergillus flavus and Fusarium graminearum...
December 26, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29304213/echinocandin-prophylaxis-in-patients-undergoing-haematopoietic-cell-transplantation-and-other-treatments-for-haematological-malignancies
#19
David J Epstein, Susan K Seo, Janice M Brown, Genovefa A Papanicolaou
Antifungal prophylaxis is the standard of care for patients undergoing intensive chemotherapy for haematological malignancy or haematopoietic cell transplantation (HCT). Prophylaxis with azoles reduces invasive fungal infections and may reduce mortality. However, breakthrough infections still occur, and the use of azoles is sometimes complicated by pharmacokinetic variability, drug interactions, adverse events and other issues. Echinocandins are highly active against Candida species, including some organisms resistant to azoles, and have some clinical activity against Aspergillus species as well...
January 1, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29304211/we-can-do-better-a-fresh-look-at-echinocandin-dosing
#20
Justin C Bader, Sujata M Bhavnani, David R Andes, Paul G Ambrose
First-line antifungal therapies are limited to azoles, polyenes and echinocandins, the former two of which are associated with high occurrences of severe treatment-emergent adverse events or frequent drug interactions. Among antifungals, echinocandins present a unique value proposition given their lower rates of toxic events as compared with azoles and polyenes. However, with the emergence of echinocandin-resistant Candida species and the fact that a pharmacometric approach to the development of anti-infective agents was not a mainstream practice at the time these agents were developed, we question whether echinocandins are being dosed optimally...
January 1, 2018: Journal of Antimicrobial Chemotherapy
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