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https://www.readbyqxmd.com/read/28431312/melatonin-charge-transfer-complex-with-2-3-dichloro-5-6-dicyano-1-4-benzoquinone-molecular-structure-dft-studies-thermal-analyses-evaluation-of-biological-activity-and-utility-for-determination-of-melatonin-in-pure-and-dosage-forms
#1
Gehad G Mohamed, Maher M Hamed, Nadia G Zaki, Mohamed M Abdou, Marwa El-Badry Mohamed, Abanoub Mosaad Abdallah
A simple, accurate and fast spectrophotometric method for the quantitative determination of melatonin (ML) drug in its pure and pharmaceutical forms was developed based on the formation of its charge transfer complex with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as an electron acceptor. The different conditions for this method were optimized accurately. The Lambert-Beer's law was found to be valid over the concentration range of 4-100μgmL(-1) ML. The solid form of the CT complex was structurally characterized by means of different spectral methods...
April 4, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28429626/promising-immunotherapy-against-fungal-diseases
#2
Wilfried Posch, Marion Steger, Doris Wilflingseder, Cornelia Lass-Flörl
Despite the relatively high efficacy of antifungal drugs, invasive fungal infections (IFIs) are still associated with tremendous morbidity and mortality, since late diagnosis makes an antifungal drug therapy inefficient. Therefore, antifungal immunotherapies to specifically strengthen the host´s own immune mechanisms constitute an additional promising strategy in taking action against fungal pathogens. Areas covered: The authors summarize efforts in research and clinical trials to provide safe and efficient immunotherapeutic options against invasive fungal diseases...
April 21, 2017: Expert Opinion on Biological Therapy
https://www.readbyqxmd.com/read/28429246/comparison-of-efficacy-and-safety-of-caspofungin-versus-micafungin-in-pediatric-allogeneic-stem-cell-transplant-recipients-a-retrospective-analysis
#3
Natalia Maximova, Giulia Schillani, Roberto Simeone, Alessandra Maestro, Davide Zanon
INTRODUCTION: The high morbidity and mortality associated with invasive fungal infections (IFIs) provide the rationale for antifungal prophylaxis in immuno-compromised pediatric patients undergoing hematopoietic stem cell transplantation (HSCT). Caspofungin and micafungin are antifungal agents of interest for prophylaxis of IFIs because of their potency against Candida and minimal toxicity or interactions with other drugs. Few studies have demonstrated the safety and efficacy of such echinocandins as prophylaxis for IFIs in patients undergoing HSCT...
April 20, 2017: Advances in Therapy
https://www.readbyqxmd.com/read/28428067/targeting-and-synergistic-action-of-an-antifungal-peptide-in-an-antibiotic-drug-delivery-system
#4
Seong-Cheol Park, Young-Min Kim, Jong-Kook Lee, Nam-Hong Kim, Eun-Ji Kim, Hun Heo, Min-Young Lee, Jung Ro Lee, Mi-Kyeong Jang
Amphotericin B (AmB) has been widely used against fungal infections throughout almost the entire body, including the skin, nails, oral cavity, respiratory tract, and urinary tract. However, the development of AmB-loaded nanoparticles demands a novel technique that reduces its toxicity and other associated problems. Here, we developed a pH-responsive and redox-sensitive polymer-based AmB-delivery carrier system. In particular, this system was functionalized by conjugation with the antifungal peptide histatin 5, which acts both as a targeting ligand and a synergistic antifungal molecule against Candida albicans, a major systemic fungal pathogen of humans...
April 17, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28426852/an-outbreak-of-endogenous-fungal-endophthalmitis-among-intravenous-drug-abusers-in-new-england
#5
Aubrey R Tirpack, Jay S Duker, Caroline R Baumal
Importance: Intravenous drug abuse (IVDA) is a known risk factor for endogenous fungal endophthalmitis (EFE), a severe intraocular infection caused by hematogenous seeding of mycotic organisms to the eye. Reporting significant increases in heroin-related deaths since 2014, the New England region is in the midst of an opioid crisis that has led to a substantial increase in patients at risk for this vision-threatening disease. Objective: To present an update on characteristics, management, and visual outcomes in patients with EFE...
April 20, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28425571/clinical-factors-affecting-costs-in-patients-receiving-systemic-antifungal-therapy-in-intensive-care-units-in-greece-results-from-the-estimator-study
#6
A Armaganidis, S Nanas, E Antoniadou, K Mandragos, K Liakou, A Koutsoukou, G Baltopoulos, G Nakos, A Kounougeri, K Ganas, A Prekates, M Kompoti, D Georgopoulos, I Pneumatikos, E Zakynthinos
Invasive fungal infections are common in intensive care units (ICUs) but there is a great variability in factors affecting costs of different antifungal treatment strategies in clinical practice. To determine factors affecting treatment cost in adult ICU patients with or without documented invasive fungal infection receiving systemic antifungal therapy (SAT) we have performed a prospective, multicentre, observational study enrolling patients receiving SAT in participating ICUs in Greece. During the study period, 155 patients received SAT at 14 participating ICUs: 37 (23...
April 20, 2017: Mycoses
https://www.readbyqxmd.com/read/28420288/microemulsion-loaded-hydrogel-as-a-promising-vehicle-for-dermal-delivery-of-the-antifungal-sertaconazole-design-optimization-and-ex-vivo-evaluation
#7
Shaimaa Ali Ali Radwan, Aliaa Nabil ElMeshad, Raguia Aly Shoukri
The purpose of the present study was to develop and optimize sertaconazole microemulsion-loaded hydrogel (STZ ME G) to enhance the dermal delivery and skin retention of the drug. Following screening of various oils for maximum drug solubility, twelve pseudoternary phase diagrams were constructed using oils (Peceol®, Capryol(®) 90), surfactants (Tween(®) 80, Cremophor(®) EL), a cosurfactant (Transcutol(®) P) and water. A 2(1)x 3(1)x 2(1)x 3(1) full factorial design was employed to optimize a ME of desirable characteristics...
April 19, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28420136/discovery-of-an-octahedral-silicon-complex-as-a-potent-antifungal-agent
#8
Chen Fu, Bin Fu, Xixi Peng, Guojian Liao
Octahedral transition metal complexes have been shown to have tremendous applications in chemical biology and medicinal chemistry. Meanwhile, structural transition metals can be replaced by inert octahedral silicon in a proof-of-principle study. We here introduce the first example of octahedral silicon complexes, which can very well serve as an efficient antimicrobial agent. The typical silicon arenediolate complex 1 {[(phen)₂Si(OO)](PF₆)₂, with phen = 1,10-phenanthroline, OO = 9,10-phenanthrenediolate} exhibited significant inhibition towards the growth of Cryptococcus neoformans with MIC and MFC values of 4...
April 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28417524/biofilms-of-candida-spp-from-the-ocular-conjunctiva-of-horses-with-reduced-azole-susceptibility-a-complicating-factor-for-the-treatment-of-keratomycosis
#9
Raimunda Sâmia Nogueira Brilhante, Paula Vago Bittencourt, Débora de Souza Collares Castelo-Branco, Glaucia Morgana de Melo Guedes, Jonathas Sales de Oliveira, Lucas Pereira Alencar, Rossana de Aguiar Cordeiro, Mariana Pinheiro, Evilázio Fernandes Nogueira-Filho, Waldemiro de Aquino Pereira-Neto, José Júlio Costa Sidrim, Marcos Fábio Gadelha Rocha
OBJECTIVES: This study aimed to assess the biofilm-forming ability of Candida spp. from the ocular conjunctiva of horses and to investigate the antifungal susceptibility of these biofilms. PROCEDURES: Initially, the biofilm-forming ability of 15 strains was assessed by crystal violet staining, which reveals the fungal biomass adhered to the polystyrene plates, and scanning electron microscopy. Then, the minimum inhibitory concentrations (MICs) of amphotericin B, fluconazole, itraconazole, and caspofungin were initially determined against strains in planktonic form...
April 18, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/28416697/small-molecule-mediated-inhibition-of-myofibroblast-transdifferentiation-for-the-treatment-of-fibrosis
#10
Michael J Bollong, Baiyuan Yang, Naja Vergani, Brittney A Beyer, Emily N Chin, Claudio Zambaldo, Danling Wang, Arnab K Chatterjee, Luke L Lairson, Peter G Schultz
Fibrosis, a disease in which excessive amounts of connective tissue accumulate in response to physical damage and/or inflammatory insult, affects nearly every tissue in the body and can progress to a state of organ malfunction and death. A hallmark of fibrotic disease is the excessive accumulation of extracellular matrix-secreting activated myofibroblasts (MFBs) in place of functional parenchymal cells. As such, the identification of agents that selectively inhibit the transdifferentiation process leading to the formation of MFBs represents an attractive approach for the treatment of diverse fibrosis-related diseases...
April 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28416557/terbinafine-resistance-of-trichophyton-clinical-isolates-caused-by-specific-point-mutations-in-the-squalene-epoxidase-gene
#11
Tsuyoshi Yamada, Mari Maeda, Mohamed Mahdi Alshahni, Reiko Tanaka, Takashi Yaguchi, Olympia Bontems, Karine Salamin, Marina Fratti, Michel Monod
Terbinafine is one of the allylamine antifungal agents, whose target is squalene epoxidase (SQLE). This agent has been extensively used in the therapy of dermatophyte infections. The incidence of patients with tinea pedis or unguium tolerant to terbinafine treatment prompted us to screen terbinafine resistance of all Trichophyton clinical isolates from the laboratory of Centre Hospitalier Universitaire Vaudois collected over a three-year period, and to identify their mechanism of resistance. Among 2056 tested isolates, 17 (≈ 1%) showed reduced terbinafine susceptibility, all of which were found to harbor SQLE gene alleles with different single point mutations, leading to single amino acid substitutions at one of four positions (Leu(393), Phe(397), Phe(415) and His(440)) of the SQLE protein...
April 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28412957/pattern-of-drug-use-among-preterm-neonates-results-from-an-italian-neonatal-intensive-care-unit
#12
A Girardi, S Galletti, E Raschi, A Koci, E Poluzzi, G Faldella, F De Ponti
BACKGROUND: Drug use in preterm neonates admitted to Neonatal Intensive Care Unit (NICU) has been investigated, so far, in terms of unauthorized or off-label use; very little is known on the use of combinations of different active substances, which is frequently required in this population (prophylaxis of infections, treatment of concomitant diseases). The aim of this study was to describe the most common patterns of drug use in an Italian NICU, focusing on those with nephrotoxic potential...
April 17, 2017: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/28412452/enhancement-of-dissolution-rate-through-eutectic-mixture-and-solid-solution-of-posaconazole-and-benznidazole
#13
Camila Bezerra Melo Figueirêdo, Daniela Nadvorny, Amanda Carla Quintas de Medeiros Vieira, José Lamartine Soares Sobrinho, Pedro José Rolim Neto, Ping I Lee, Monica Felts de La Roca Soares
Benznidazole (BNZ), the only commercialized antichagasic drug, and the antifungal compound posaconazole (PCZ) have shown synergistic action in the therapy of Chagas disease, however both active pharmaceutical ingredients (APIs) exhibit low aqueous solubility potentially limiting their bioavailability and therapeutic efficacy. In this paper, we report for the first time the formation of a eutectic mixture as well as an amorphous solid solution of PCZ and BNZ (at the same characteristic ratio of 80:20wt%), which provided enhanced solubility and dissolution rate for both APIs...
April 12, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28411057/microwave-assisted-microemulsion-technique-for-production-of-miconazole-nitrate-and-econazole-nitrate-loaded-solid-lipid-nanoparticles
#14
Rohan M Shah, Daniel S Eldridge, Enzo A Palombo, Ian H Harding
The microwave-assisted production of solid lipid nanoparticles (SLNs) is a novel technique reported recently by our group. The small particle size, solid nature and use of physiologically well-tolerated lipid materials make SLNs an interesting and potentially efficacious drug carrier. The main purpose of this research work was to investigate the suitability of microwave-assisted microemulsion technique to encapsulate selected ionic drug substances such as miconazole nitrate and econazole nitrate. The microwave-produced SLNs had a small size (250-300 nm), low polydispersity (<0...
April 11, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28409296/silver-i-complexes-with-chromone-derived-hydrazones-investigation-on-the-antimicrobial-and-cytotoxic-effects
#15
Lenka V Tamayo, Ane F Santos, Isabella P Ferreira, Verlane G Santos, Miriam T P Lopes, Heloisa Beraldo
Complexes [Ag(HCrPh)2]NO3·2H2O (1) and [Ag(HCrpClPh)2]NO3 (2) were obtained with 3-formyl-6-methylchromone-phenyl hydrazone (HCrPh, HL1) and 3-formyl-6-methylchromone-para-chloro-phenyl hydrazone (HCrpClPh, HL2). Although the hydrazones were inactive, upon coordination to silver(I) antifungal activity significantly improved against several Candida strains. Complexes (1-2) revealed to be more active than silver nitrate, silver sulfadiazine and the reference drug nystatin against Candida parapsilosis. The cytotoxic activities of the hydrazones and their silver(I) complexes were evaluated in comparison with cisplatin on B16F10 (metastatic melanoma) and Melan-a (non-tumorigenic melanocyte) cells...
April 13, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28404678/antifungal-susceptibility-testing-of-aspergillus-spp-by-using-a-cci-based-maldi-tof-ms-method-appears-to-not-offer-benefit-over-the-traditional-broth-microdilution-testing
#16
Melissa R Gitman, Lisa McTaggart, Joanna Spinato, Rahgavi Poopalarajah, Erin Lister, Shahid Husain, Julianne V Kus
Aspergillus spp. cause serious invasive lung infections and Aspergillus fumigatus is the most commonly encountered clinically significant species. Voriconazole is considered to be the drug of choice for A. fumigatus infections, however rising resistance rates have been reported. We evaluated a MALDI-ToF MS-based method for the differentiation between wild type and non-wild type isolates of 20 Aspergillus spp. (including 3 isolates 2 A. ustus, and 1 A. calidoustus that were used as controls due their intrinsic low azole susceptibility with respect to the in vitro response to voriconazole)...
April 12, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28402525/antifungal-mechanism-of-ruiii-nh3-4catechol-complex-on-fluconazole-resistant-candida-tropicalis
#17
Rafael Araújo Gomes-Junior, Roberto Santana da Silva, Renata Galvão de Lima, Marcos A Vannier-Santos
Candidiasis, a major opportunistic mycosis caused by Candida sp. may comprise life-threatening systemic infections. The incidence of non-albicans species is rising, particularly in South America and they are frequently drug resistant, causing unresponsive cases. Thus, novel antimycotic agents are required. Here we tested the antifungal activity of [RuIII(NH3)4catechol]+ complex (RuCat), approaching possible action mechanisms on fluconazole-resistant Candida tropicalis. RuCat significantly (p<0.05) inhibited the growth and viability of C...
April 11, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28400768/the-anti-helminthic-compound-mebendazole-has-multiple-antifungal-effects-against-cryptococcus-neoformans
#18
Luna S Joffe, Rafael Schneider, William Lopes, Renata Azevedo, Charley C Staats, Lívia Kmetzsch, Augusto Schrank, Maurizio Del Poeta, Marilene H Vainstein, Marcio L Rodrigues
Cryptococcus neoformans is the most lethal pathogen of the central nervous system. The gold standard treatment of cryptococcosis, a combination of amphotericin B with 5-fluorocytosine, involves broad toxicity, high costs, low efficacy, and limited worldwide availability. Although the need for new antifungals is clear, drug research and development (R&D) is costly and time-consuming. Thus, drug repurposing is an alternative to R&D and to the currently available tools for treating fungal diseases. Here we screened a collection of compounds approved for use in humans seeking for those with anti-cryptococcal activity...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28400399/cardiotoxicity-with-itraconazole
#19
Vishesh Paul, Harsh Rawal
Itraconazole is a commonly used antifungal drug. In addition to commonly described adverse effects, there have been few reports of heart failure with its use. We present two cases that developed acute systolic heart failure with Itraconazole use. A man in his early 30s was admitted with worsening leg swelling and dyspnoea on exertion. He had been on Itraconazole for blastomyces skin ulcer. His ejection fraction (EF) was found to be 10%-15%. Another man in his 50s was admitted with similar symptoms; his EF was 40%-45%...
April 10, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28400291/unmet-clinical-needs-in-the-treatment-of-systemic-fungal-infections-the-role-of-amphotericin-b-and-drug-targeting
#20
Raquel Fernández-García, Esther de Pablo, María Paloma Ballesteros, Dolores R Serrano
Recently an increase in both the prevalence and incidence of invasive fungal infections have been reported. The number of fungal species that can cause systemic mycoses are higher and current antifungal therapies are still far from ideal. The emergence of antifungal resistances has a major clinical impact when using azoles and echinocandins leading to possible treatment failure and ultimately putting the patient's life at risk. Amphotericin B can play a key role in treating severe invasive mycoses as the incidence of antifungal resistance is very low combined with a high efficacy against a wide range of fungi...
April 8, 2017: International Journal of Pharmaceutics
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