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Candida drug resistance

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https://www.readbyqxmd.com/read/28944888/screening-of-potential-genes-contributing-to-the-macrocycle-drug-resistance-of-c-albicans-via-microarray-analysis
#1
Jing Yang, Wei Zhang, Jian Sun, Zhiqin Xi, Zusha Qiao, Jinyu Zhang, Yan Wang, Ying Ji, Wenli Feng
The aim of the present study was to investigate the potential genes involved in drug resistance of Candida albicans (C. albicans) by performing microarray analysis. The gene expression profile of GSE65396 was downloaded from the Gene Expression Omnibus, including a control, 15‑min and 45‑min macrocyclic compound RF59‑treated group with three repeats for each. Following preprocessing using RAM, the differentially expressed genes (DEGs) were screened using the Limma package. Subsequently, the Kyoto Encyclopedia of Genes and Genomes pathways of these genes were analyzed using the Database for Annotation, Visualization and Integrated Discovery...
September 20, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28944225/conserved-inhibition-of-neutrophil-extracellular-trap-release-by-clinical-candida-albicans-biofilms
#2
John F Kernien, Chad J Johnson, Jeniel E Nett
Candida albicans biofilms are difficult to eradicate due to their resistance to host defenses and antifungal drugs. Although neutrophils are the primary responder to C. albicans during invasive candidiasis, biofilms resist killing by neutrophils. Prior investigation, with the commonly used laboratory strain SC5314, linked this phenotype to the impaired release of neutrophil extracellular traps (NETs), which are structures of DNA, histones, and antimicrobial proteins involved in extracellular microbial killing...
September 2017: Journal of Fungi (Basel, Switzerland)
https://www.readbyqxmd.com/read/28943366/gentamicin-synergizes-with-azoles-against-resistant-candida-albicans
#3
Mengjiao Lu, Cuixiang Yu, Xueyan Cui, Jinyi Shi, Lei Yuan, Shujuan Sun
Candida species are the primary opportunistic pathogens of nosocomial fungal infections, causing both superficial and life-threatening systemic infections. Combination therapy for fungal infections has attracted considerable attention, especially for those caused by drug-resistant fungi. Gentamicin, an aminoglycoside antibiotic, has a weak antifungal activity against Fusarium. The aim of this study was to investigate the interactions of gentamicin with azoles against the Candida species and the underlying mechanism...
September 21, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28939316/controlling-a-possible-outbreak-of-candida-auris-infection-lessons-learnt-from-multiple-interventions
#4
Manisha Biswal, Shivaprakash M Rudramurthy, Neha Jain, A S Shamanth, Dipti Sharma, Kajal Jain, L N Yaddanapudi, A Chakrabarti
BACKGROUND: Multi-drug-resistant Candida auris infection has been reported from five continents in recent years. The prevalence of C. auris invasive infection has been estimated at 5.3% for intensive care acquired candidaemia, in India. The transmission of the organism between the patients and from environment to patients is rapid. AIM: To understand the intra-hospital dynamics of C. auris transmission and determine the possible interventions to prevent its spread...
September 19, 2017: Journal of Hospital Infection
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
#5
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/28930221/compounds-from-terminalia-mantaly-l-combretaceae-stem-bark-exhibit-potent-inhibition-against-some-pathogenic-yeasts-and-enzymes-of-metabolic-significance
#6
Marthe Aimée Tchuente Tchuenmogne, Thierry Ngouana Kammalac, Sebastian Gohlke, Rufin Marie Toghueo Kouipou, Abdulselam Aslan, Muslum Kuzu, Veysel Comakli, Ramazan Demirdag, Silvère Augustin Ngouela, Etienne Tsamo, Norbert Sewald, Bruno Ndjakou Lenta, Fabrice Fekam Boyom
Background: Pathogenic yeasts resistance to current drugs emphasizes the need for new, safe, and cost-effective drugs. Also, new inhibitors are needed to control the effects of enzymes that are implicated in metabolic dysfunctions such as cancer, obesity, and epilepsy. Methods: The anti-yeast extract from Terminalia mantaly (Combretaceae) was fractionated and the structures of the isolated compounds established by means of spectroscopic analysis and comparison with literature data. Activity was assessed against Candida albicans, C...
January 24, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28929952/cutaneous-candidiasis-in-a-gottingen-minipig-a-potential-pitfall-in-preclinical-studies
#7
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
#8
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
#9
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/28919409/solasodine-3-o-%C3%AE-d-glucopyranoside-is-hydrolyzed-by-a-membrane-glucosidase-into-active-molecule-solasodine-against-candida-albicans
#10
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
#11
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/28911043/multidrug-resistant-candida-epidemiology-molecular-mechanisms-and-treatment
#12
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
#13
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/28894103/the-candida-albicans-transcription-factor-cas5-couples-stress-responses-drug-resistance-and-cell-cycle-regulation
#14
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/28893777/modulation-of-staphylococcus-aureus-response-to-antimicrobials-by-the-candida-albicans-quorum-sensing-molecule-farnesol
#15
Eric F Kong, Christina Tsui, Sona Kucharíková, Patrick Van Dijck, Mary Ann Jabra-Rizk
In microbial biofilms, microorganisms utilize secreted signaling chemical molecules to coordinate their collective behavior. Farnesol is a quorum-sensing molecule secreted by the fungal species Candida albicans, shown to play a central physiological role during fungal biofilm growth. Our pervious in vitro and in vivo studies characterized an intricate interaction between C. albicans and the bacterial pathogen Staphylococcus aureus, as these species co-exist in biofilm. In this study, we aimed to investigate the impact of farnesol on S...
September 11, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28886681/molecular-evolution-of-antifungal-drug-resistance
#16
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
#17
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/28882013/antimicrobial-management-in-nosocomial-peritonitis-microbiota-drug-and-time
#18
REVIEW
A Montero, P Salgado Aranda, F Gilsanz, E Maseda
Complicated intra-abdominal infection requires surgical treatment and broad-spectrum empiric antibiotic treatment used early. The rapid spread of multidrug-resistant bacteria has become a serious threat, especially in critical care units. The excessive use of carbapenems has led to carbapenemase-producing Enterobacteriaceae, leaving tigecycline and colistin as therapeutical options. The new antimicrobials, ceftazidime-avibactam and ceftolozane-tazobactam open new horizons in the treatment of multi-drug resistant Enterobacteriaceae...
September 2017: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
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/28840541/drugs-in-clinical-development-for-fungal-infections
#20
Maria F Gonzalez-Lara, Jose Sifuentes-Osornio, Luis Ostrosky-Zeichner
Despite increasing rates of invasive fungal infections being reported globally, only a single antifungal drug has been approved during the last decade. Resistance, toxicity, drug interactions and restricted routes of administration remain unresolved issues. This review focuses on new antifungal compounds which are currently in various clinical phases of development. We discuss two azoles with a tetrazole moiety that allows selective activity against the fungal CYP: VT-1161 for Candida infections and VT-1129 for cryptococcal meningoencephalitis...
August 24, 2017: Drugs
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