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Candida antifungal resistance

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https://www.readbyqxmd.com/read/28936041/antifungal-response-of-oral-associated-candidal-reference-strains-american-type-culture-collection-by-supercritical-fluid-extract-of-nutmeg-seeds-for-geriatric-denture-wearers-an-in-vitro-screening-study
#1
Meenakshi Iyer, Anil Kumar Gujjari, Vishakante Gowda, Shridhar Angadi
OBJECTIVES: Since time immemorial, plants have continued to play a predominant role in the maintenance of human health as sources of medicinal compounds. Several effective antifungal agents are available for oral Candida infections; the failure is not uncommon because isolates of Candida albicans may exhibit resistance to the drug during therapy. The present study aimed to identify an alternative, inexpensive, simple, and effective method of preventing and controlling the candidal infection...
July 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28929952/cutaneous-candidiasis-in-a-gottingen-minipig-a-potential-pitfall-in-preclinical-studies
#2
Yuval Ramot, Ana Obaya, Alice McNamara, Abraham Nyska
The Göttingen minipig is often used in preclinical toxicity studies. Therefore, knowledge of spontaneously occurring pathologies is important to differentiate them from test drug-related effects. We report on a Göttingen minipig, which developed exudating widespread dermatitis during a preclinical toxicity study with a subcutaneously injected drug. The lesions were resistant to topical and oral antibacterial medications. Skin cultures were positive for Candida albicans, and treatment was changed to topical antifungal cream with quick resolution of the skin lesions...
January 1, 2017: Toxicologic Pathology
https://www.readbyqxmd.com/read/28925956/sulfadiazine-salicylaldehyde-based-schiff-bases-synthesis-antimicrobial-activity-and-cytotoxicity
#3
Martin Krátký, Magdaléna Dzurková, Jiří Janoušek, Klára Konečná, František Trejtnar, Jiřina Stolaříková, Jarmila Vinšová
The resistance among microbes has brought an urgent need for new drugs. Thus, we synthesized a series of Schiff bases derived from the sulfa drug sulfadiazine and various salicylaldehydes. The resulting 4-[(2-hydroxybenzylidene)amino]-N-(pyrimidin-2-yl)benzene-sulfonamides were characterized and evaluated against Gram-positive and Gram-negative bacteria, yeasts, moulds, Mycobacterium tuberculosis, nontuberculous mycobacteria (M. kansasii, M. avium) and their cytotoxicity was determined. Among bacteria, the genus Staphylococcus, including methicillin-resistant S...
September 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28919789/antifungal-resistance-current-trends-and-future-strategies-to-combat
#4
REVIEW
Nathan P Wiederhold
Antifungal resistance represents a major clinical challenge to clinicians responsible for treating invasive fungal infections due to the limited arsenal of systemically available antifungal agents. In addition current drugs may be limited by drug-drug interactions and serious adverse effects/toxicities that prevent their prolonged use or dosage escalation. Fluconazole resistance is of particular concern in non-Candida albicans species due to the increased incidence of infections caused by these species in different geographic locations worldwide and the elevated prevalence of resistance to this commonly used azole in many institutions...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28919715/in-vitro-inhibitory-activities-of-magnolol-against-candida-spp
#5
Peiru Zhou, Jingya Fu, Hong Hua, Xiaosong Liu
Candida spp. cause various infections involving the skin, mucosa, deep tissues, and even life-threatening candidemia. They are regarded as an important pathogen of nosocomial bloodstream infection, with a high mortality rate. As a result of prolonged exposure to azoles, the therapeutic failure associated with azoles resistance has become a serious challenge in clinical situations. Therefore, novel, alternative antifungals are required urgently. In the present study, the CLSI M-27A broth microdilution method and the 2,3-Bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide (XTT) reduction assay were used to evaluate the antifungal effects of magnolol against various standard Candida strains in planktonic mode and biofilm formation, respectively...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28919409/solasodine-3-o-%C3%AE-d-glucopyranoside-is-hydrolyzed-by-a-membrane-glucosidase-into-active-molecule-solasodine-against-candida-albicans
#6
Wenqiang Chang, Ying Li, Sha Zheng, Ming Zhang, Yanhui Gao, Hongxiang Lou
Antifungal activity of some natural molecules can be abated or blocked by efflux pumps in Candida albicans, which restricts the discovery of potential antifungal agents. Here we found that the steroidal alkaloid solasodine is active against C. albicans efflux pump-deficient strains but inert towards the wild type. However, the glucosylated solasodine-3-O-β-d-glucopyranoside exhibits antifungal activity towards the wild type strain. Further investigation revealed that the entry of solasodine into C. albicans cells is blocked by efflux pumps...
September 15, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28912344/parasex-generates-phenotypic-diversity-de-novo-and-impacts-drug-resistance-and-virulence-in-candida-albicans
#7
Matthew P Hirakawa, Darius E Chyou, Denis Huang, Aaron R Slan, Richard J Bennett
Candida albicans is a diploid fungus that is a frequent cause of mucosal and systemic infections in humans. This species exhibits an unusual parasexual cycle in which mating produces tetraploid cells that undergo a non-meiotic program of concerted chromosome loss to return to a diploid or aneuploid state. In this work, we used a multipronged approach to examine the capacity of parasex to generate diversity in C. albicans First, we compared the phenotypic properties of 32 genotyped progeny and observed wide-ranging differences in fitness, filamentation, biofilm formation and virulence...
September 14, 2017: Genetics
https://www.readbyqxmd.com/read/28911047/the-role-of-in-vitro-susceptibility-testing-in-the-management-of-candida-and-aspergillus
#8
Luis Ostrosky-Zeichner, David Andes
Antifungal susceptibility testing has evolved from a research technique to a standardized and well-validated tool for the clinical management of fungal infections and for epidemiological studies. Genetic mutations and phenotypic resistance in vitro have been shown to correlate with clinical outcomes and treatment failures, and this in turn has led to the creation of clinical breakpoints and, more recently, epidemiological cutoff values for clinically relevant fungal pathogens. Resistance mechanisms for Candida and Aspergillus species have been extensively described and their corresponding genetic mutations can now be readily detected...
August 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28911043/multidrug-resistant-candida-epidemiology-molecular-mechanisms-and-treatment
#9
REVIEW
Maiken Cavling Arendrup, Thomas F Patterson
Invasive Candida infections remain an important cause of morbidity and mortality, especially in hospitalized and immunocompromised or critically ill patients. A limited number of antifungal agents from only a few drug classes are available to treat patients with these serious infections. Resistance can be either intrinsic or acquired. Resistance mechanisms are not exchanged between Candida; thus, acquired resistance either emerges in response to an antifungal selection pressure in the individual patient or, more rarely, occur due to horizontal transmission of resistant strains between patients...
August 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28900419/enhanced-killing-and-antibiofilm-activity-of-encapsulated-cinnamaldehyde-against-candida-albicans
#10
Shahper N Khan, Shakir Khan, Jawed Iqbal, Rosina Khan, Asad U Khan
Candida sp. impelled opportunistic infection in immune-compromised patients ensuing from asymptomatic colonization to pathogenic forms. Moreover, slow spread of Candida species inducing refractory mucosal and invasive infections brings acute resistance to antifungal drugs. Hence, here we probed the effect of encapsulated preparation of cinnamaldehyde (CNMA) in multilamellar liposomes (ML) against Candida albicans. The efficacy of ML-CNMA against Candida biofilm was assessed by scanning electron microscopy, transmission electron microscopy, as well as light microscopy and its percent inhibition, was determined by XTT [2,3-bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide] and crystal violet assay...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28894714/quantification-of-cdr1-gene-expression-in-fluconazole-resistant-candida-glabrata-strains-using-real-time-pcr
#11
Shadi Shahrokhi, Fatemeh Noorbakhsh, Sassan Rezaie
BACKGROUND: The opportunistic fungi, particularly Candida glabrata has been known as main etiologic agents of life-threating infections in some patients. Although fluconazole is the most effective antifungal agent against candidiasis, C. glabrata, fluconazole-resistant strains have been increased recently overexpression or mutations of ATP-binding cassette (ABC) transporter family membrane proteins such as; Cg CDR1, Cg CDR2 are responsible for fluconazole resistance in a large proportion of candidiasis cases...
August 2017: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/28894103/the-candida-albicans-transcription-factor-cas5-couples-stress-responses-drug-resistance-and-cell-cycle-regulation
#12
Jinglin L Xie, Longguang Qin, Zhengqiang Miao, Ben T Grys, Jacinto De La Cruz Diaz, Kenneth Ting, Jonathan R Krieger, Jiefei Tong, Kaeling Tan, Michelle D Leach, Troy Ketela, Michael F Moran, Damian J Krysan, Charles Boone, Brenda J Andrews, Anna Selmecki, Koon Ho Wong, Nicole Robbins, Leah E Cowen
The capacity to coordinate environmental sensing with initiation of cellular responses underpins microbial survival and is crucial for virulence and stress responses in microbial pathogens. Here we define circuitry that enables the fungal pathogen Candida albicans to couple cell cycle dynamics with responses to cell wall stress induced by echinocandins, a front-line class of antifungal drugs. We discover that the C. albicans transcription factor Cas5 is crucial for proper cell cycle dynamics and responses to echinocandins, which inhibit β-1,3-glucan synthesis...
September 11, 2017: Nature Communications
https://www.readbyqxmd.com/read/28893036/oral-candidal-carriage-in-subjects-with-pure-vegetarian-and-mixed-dietary-habits
#13
Shankargouda Patil, Roopa S Rao, A Thirumal Raj, D S Sanketh, Sachin Sarode, Gargi Sarode
INTRODUCTION: Candida albicans being a part of the normal oral microbial flora is one of the most commonly isolated species from the oral cavity. Recent studies have shown a steady rise in the number of non C. albicans species, which are relatively resistant to common antifungal agents and are being recognized as potential pathogens. It is vital to ascertain the predisposing factors leading to such a shift in the oral candidal flora. AIM: To estimate the prevalence of candidal species among vegetarians and non-vegetarians...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28886952/clinical-manifestations-of-candidemia-caused-by-uncommon-candida-species-and-antifungal-susceptibility-of-the-isolates-in-a-regional-hospital-in-taiwan-2007-2014
#14
Wei-Lun Liu, Chih-Cheng Lai, Ming-Chi Li, Chi-Jung Wu, Wen-Chien Ko, Yi-Li Hung, Hung-Jen Tang, Po-Ren Hsueh
OBJECTIVE: This retrospective study investigated clinical manifestations of candidemia caused by uncommon Candida species and antifungal susceptibility of the isolates in a regional hospital in Taiwan. METHODS: The uncommon Candida species was initially defined as Candida species other than C. albicans, C. tropicalis, C. glabrata complex, C. parapsilosis complex and C. krusei. All uncommon Candida isolates were identified and confirmed by molecular methods. In vitro susceptibility testing of the uncommon Candida species to nine antifungal agents was conducted using the broth microdilution method with the Sensititre YeastOne (SYO) system (Trek Diagnostic Systems, Ltd...
August 26, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28886681/molecular-evolution-of-antifungal-drug-resistance
#15
Nicole Robbins, Tavia Caplan, Leah E Cowen
The fungal pathogens Candida albicans, Cryptococcus neoformans, and Aspergillus fumigatus have transitioned from a rare curiosity to a leading cause of human mortality. The management of infections caused by these organisms is intimately dependent on the efficacy of antifungal agents; however, fungi that are resistant to these treatments are regularly isolated in the clinic, impeding our ability to control infections. Given the significant impact fungal pathogens have on human health, it is imperative to understand the molecular mechanisms that govern antifungal drug resistance...
September 8, 2017: Annual Review of Microbiology
https://www.readbyqxmd.com/read/28884772/afm-combined-to-atr-ftir-reveals-candida-cell-wall-changes-under-caspofungin-treatment
#16
Fabienne Quilès, Isabelle Accoceberry, Célia Couzigou, Grégory Francius, Thierry Noël, Sofiane El-Kirat-Chatel
Fungal pathogens from Candida genus are responsible for severe life-threatening infections and the antifungal arsenal is still limited. Caspofungin, an antifungal drug used for human therapy, acts as a blocking agent of the cell wall synthesis by inhibiting the β-1,3-glucan-synthase encoded by FKS genes. Despite its efficiency, the number of genetic mutants that are resistant to caspofungin is increasing. An important challenge to improve antifungal therapy is to understand cellular phenomenon that are associated with drug resistance...
September 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28871788/antifungal-effect-of-arabidopsis-sgt1-proteins-via-mitochondrial-reactive-oxygen-species
#17
Seong-Cheol Park, Mi Sun Cheong, Eun-Ji Kim, Jin Hyo Kim, Yong Hun Chi, Mi-Kyeong Jang
The highly conserved SGT1 (suppressor of the G2 alleles of skp1) proteins from Arabidopsis are known to contribute to plant resistance to pathogens. While SGT1 proteins response to fungal pathogens, their antifungal activity is not reported and the mechanism for this inhibition is not well understood. Therefore, recombinant Arabidopsis SGT1 proteins were cloned, expressed, and purified to evaluate their antifungal activity, resulted in their potent inhibition of pathogen growth. Dye-labeled proteins localized to the cytosol of Candida albicans cells without the disruption of the cell membrane...
September 5, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28870262/virulence-factors-antifungal-susceptibility-and-molecular-mechanisms-of-azole-resistance-among-candida-parapsilosis-complex-isolates-recovered-from-clinical-specimens
#18
Sourour Neji, Ines Hadrich, Houaida Trabelsi, Salma Abbes, Fatma Cheikhrouhou, Hayet Sellami, Fattouma Makni, Ali Ayadi
BACKGROUND: The aim of this study was to determine the biofilm formation, the extracellular enzymatic activities of 182 clinical isolates of the Candida parapsilosis complex. METHODS: Molecular identification of the C. parapsilosis species complex was performed using PCR RFLP of SADH gene and PCR sequencing of ITS region. The susceptibility of ours isolates to antifungal agents and molecular mechanisms underlying azole resistance were evaluated. RESULTS: 63...
September 4, 2017: Journal of Biomedical Science
https://www.readbyqxmd.com/read/28869083/antifungal-effect-of-cow-s-urine-distillate-on-candida-species
#19
J M Hoh, B Dhanashree
BACKGROUND: Increase in resistance of Candida species, to routinely used antifungal agents has necessitated the quest for new drugs. Few studies have revealed that cow's urine can suppress the growth of pathogenic fungi. However there is no published report on antifungal effects of cow's urine on clinical Candida isolates. OBJECTIVE: The present study aims at exploring the antifungal potential of cow's urine on clinical isolates of Candida species. MATERIAL & METHODS: In this in-vitro experimental study four standard strains and 37 clinical isolates of Candida species were tested for their susceptibility to amphotericin B, fluconazole and voriconazole, by disk diffusion method...
August 30, 2017: Journal of Ayurveda and Integrative Medicine
https://www.readbyqxmd.com/read/28856589/impact-of-a-mixed-educational-and-semi-restrictive-antimicrobial-stewardship-project-in-a-large-teaching-hospital-in-northern-italy
#20
Daniele Roberto Giacobbe, Valerio Del Bono, Malgorzata Mikulska, Giulia Gustinetti, Anna Marchese, Federica Mina, Alessio Signori, Andrea Orsi, Fulvio Rudello, Cristiano Alicino, Beatrice Bonalumi, Alessandra Morando, Giancarlo Icardi, Sabrina Beltramini, Claudio Viscoli, Antonio Ferrazin, Ferdinando Dodi, Norberto Morandi, Federica Toscanini, Marco Camera, Antonio Di Biagio, Giovanni Mazzarello, Anna Ida Alessandrini, Andrea De Maria, Emanuele Delfino, Laura Ambra Nicolini, Carolina Saffioti, Federica Magnè, Nemo Gandolfo
BACKGROUND: The overuse of antimicrobials favors the dissemination of antimicrobial resistance, as well as invasive fungal diseases and Clostridium difficile infections (CDI). In this study, we assessed the impact of a mixed educational and semi-restrictive antimicrobial stewardship (AMS) project in a large teaching hospital in Italy. METHODS: The AMS project was conducted from May 2014 to April 2016. It consisted of two initiatives in two consecutive periods: (1) educational activities; (2) semi-restrictive control of antimicrobial prescribing through a computerized software...
August 30, 2017: Infection
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