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trichosporon asahii

Thaís Felli Kubiça, Laura Bedin Denardi, Maria Isabel Azevedo, Vanessa Oliveira, Luiz Carlos Severo, Janio Morais Santurio, Sydney Hartz Alves
The antifungal activity of tacrolimus in combination with antifungal agents against different fungal species has been previously reported. Here we report the in vitro interactions between tacrolimus and amphotericin B, fluconazole, itraconazole, and caspofungin against 30 clinical isolates of both fluconazole-susceptible and fluconazole-resistant Trichosporon asahii. For these analyses, we used the broth microdilution method based on the M27-A3 technique and checkerboard microdilution method. Tacrolimus showed no activity against T...
September 30, 2016: Brazilian Journal of Infectious Diseases
Mario Fernández-Ruiz, Jesús Guinea, Mireia Puig-Asensio, Óscar Zaragoza, Benito Almirante, Manuel Cuenca-Estrella, José María Aguado
Fungemia due to rare yeasts constitutes an emerging but poorly investigated condition. Data on risk factors, clinical features, therapy, and outcome of episodes of fungemia due to rare (non-Candida, non-Cryptococcus) yeasts were analyzed in a population-based surveillance program conducted in 29 Spanish hospitals between May 2010 and April 2011. Species identification (DNA sequencing) and antifungal susceptibility testing (EUCAST and CLSI methods) were centrally performed. Fourteen out of 767 episodes of fungemia (1...
August 4, 2016: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
Amit Kumar Rai, Reena Kumari, Samurailatpam Sanjukta, Dinabandhu Sahoo
The aim of this work was to study the production of bioactive protein hydrolysates using yeasts isolated from chhurpi. For this, a total of 125 proteolytic yeasts were isolated and molecular identification was carried out by analysis of the restriction digestion pattern generated by digesting the PCR amplified internal transcribed spacer region and 5.8S rRNA gene (ITS1-5.8S-ITS2) using three endonucleases (HaeIII, CfoI and HinfI). The results obtained showed that different proteolytic yeasts were dominant in marketed products (Kluyveromyces marxianus and Issatchenkia orientalis) and samples from production centers (Trichosporon asahii, Saccharomyces cerevisiae and Exophiala dermatitidis)...
November 2016: Bioresource Technology
João N de Almeida, Jaques Sztajnbok, Afonso Rafael da Silva, Vinicius Adriano Vieira, Anne Layze Galastri, Leandro Bissoli, Nadia Litvinov, Gilda Maria Barbaro Del Negro, Adriana Lopes Motta, Flávia Rossi, Gil Benard
Moulds and arthroconidial yeasts are potential life-threatening agents of fungemia in immunocompromised patients. Fast and accurate identification (ID) of these pathogens hastens initiation of targeted antifungal therapy, thereby improving the patients' prognosis. We describe a new strategy that enabled the identification of moulds and arthroconidial yeasts directly from positive blood cultures by MALDI-TOF mass spectrometry (MS). Positive blood cultures (BCs) with Gram staining showing hyphae and/or arthroconidia were prospectively selected and submitted to an in-house protein extraction protocol...
November 1, 2016: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
Suteng Yang, Yong Liao, Lin Cong, Xuelian Lu, Rongya Yang
Increasing drug resistance has brought enormous challenges to the management of Trichosporon spp. infections. The in vitro antifungal activities of non-steroidal anti-inflammatory drugs (NSAIDs) against Candida spp. and Cryptococcus spp. were recently discovered. In the present study, the in vitro interactions between three NSAIDs (aspirin, ibuprofen and diclofenac sodium) and commonly used antifungal agents (fluconazole, itraconazole, voriconazole, caspofungin and amphotericin B) against planktonic and biofilm cells of T...
2016: PloS One
Vijaylatha Rastogi, Prasanna Honnavar, Shivaprakash M Rudramurthy, Umabala Pamidi, Anup Ghosh, Arunaloke Chakrabarti
In Asian countries, Trichosporon infection is a well-known disease in Japan. In India, the infection is increasingly recognised. The study was conducted to characterise the clinical Trichosporon isolates from India by phenotypic and molecular techniques. A total of 31 Trichosporon clinical isolates, recovered from patients of 14 hospitals across India were sequenced (ITS and IGS1 regions of rDNA). In vitro drug susceptibility testing of the isolates was performed against amphotericin-B, fluconazole, itraconazole, voriconazole and posaconazole...
August 2016: Mycoses
Xin Hou, Meng Xiao, Sharon C-A Chen, He Wang, Li Zhang, Xin Fan, Zhi-Peng Xu, Jing-Wei Cheng, Fanrong Kong, Yu-Pei Zhao, Ying-Chun Xu
Accurate species identification of Candida, Cryptococcus, Trichosporon and other yeast pathogens is important for clinical management. In the present study, we developed and evaluated a yeast species identification scheme by determining the rDNA internal transcribed spacer (ITS) region length types (LTs) using a sequencer-based capillary gel electrophoresis (SCGE) approach. A total of 156 yeast isolates encompassing 32 species were first used to establish a reference SCGE ITS LT database. Evaluation of the ITS LT database was then performed on (i) a separate set of (n = 97) clinical isolates by SCGE, and (ii) 41 isolates of 41 additional yeast species from GenBank by in silico analysis...
2016: PloS One
Mark J Lee, Alexander M Geller, Natalie C Bamford, Hong Liu, Fabrice N Gravelat, Brendan D Snarr, François Le Mauff, Joseé Chabot, Benjamin Ralph, Hanna Ostapska, Mélanie Lehoux, Robert P Cerone, Stephanie D Baptista, Evgeny Vinogradov, Jason E Stajich, Scott G Filler, P Lynne Howell, Donald C Sheppard
UNLABELLED: The mold Aspergillus fumigatus causes invasive infection in immunocompromised patients. Recently, galactosaminogalactan (GAG), an exopolysaccharide composed of galactose and N-acetylgalactosamine (GalNAc), was identified as a virulence factor required for biofilm formation. The molecular mechanisms underlying GAG biosynthesis and GAG-mediated biofilm formation were unknown. We identified a cluster of five coregulated genes that were dysregulated in GAG-deficient mutants and whose gene products share functional similarity with proteins that mediate the synthesis of the bacterial biofilm exopolysaccharide poly-(β1-6)-N-acetyl-D-glucosamine (PNAG)...
2016: MBio
Yogesh Singh, Namita Gupta, Ved Vrat Verma, Manisha Goel, Rani Gupta
TALipB (33 kDa) is a solvent stable, enantioselective lipase from Trichosporon asahii MSR54. It is cysteine-rich and shows activation in presence of thiol reducing agents. DIANNA server predicted three disulphide bridges C53-C195 (S1), C89-C228 (S2) and C164-C254 (S3) in the enzyme. Selective disruption of disulphide bonds by cysteine to alanine mutations at Cys53 and Cys89 of S1 and S2 bonds resulted in enzyme activation. Mutant mTALipB (S1+S2) showed increase in specific activity by ∼4-fold (834 mM/mg) and improved Vmax of 6...
March 25, 2016: Biochemical and Biophysical Research Communications
Adriana Araújo de Almeida, Bruno do Amaral Crispim, Alexéia Barufatti Grisolia, Terezinha Inez Estivalet Svidzinski, Lais Gonçalvez Ortolani, Kelly Mari Pires de Oliveira
In this study, the culture analysis of urine samples from patients hospitalized in the Central-West region of Brazil was performed, and the isolated microorganisms were phylogenetically identified as Trichosporon asahii. Maximum parsimony analysis of the IGS1 sequences revealed three novel genotypes that have not been described. The minimum inhibitory concentrations of the nine isolates identified were in the range of 0.06-1 μg/ml for amphotericin B, 0.25-4 μg/ml for fluconazole, and 0.03-0.06 μg/ml for itraconazole...
January 2016: Revista Argentina de Microbiología
Yuntong Lv, Zhikuan Xia, Wenling Wang
The Spitzenkörper is a dynamic and specialized multicomponent cell complex present in the tips of hyphal cells. The amphiphilic styryl dye FM4-64 was found to be ideal for imaging the dynamic changes of the apical vesicle cluster within growing hyphal tips. It is widely used as a marker of endocytosis and to visualize vacuolar membranes. Here we performed uptake experiments using FM4-64 to study the dynamic of the Spitzenkörper in Trichosporon asahii. We observed that Spitzenkörpers were present at the tip of the budding site of the spore, blastospore, and the germ tube of T...
January 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
Raimunda S N Brilhante, Manoel A N Paiva, Célia M S Sampaio, Débora S C M Castelo-Branco, Carlos E C Teixeira, Lucas P de Alencar, Tereza J P G Bandeira, André J Monteiro, Rossana A Cordeiro, Waldemiro A Pereira-Neto, José J C Sidrim, José L B Moreira, Marcos F G Rocha
Since, there is no study reporting the mechanism of azole resistance among yeasts isolated from aquatic environments; the present study aims to investigate the occurrence of antifungal resistance among yeasts isolated from an aquatic environment, and assess the efflux-pump activity of the azole-resistant strains to better understand the mechanism of resistance for this group of drugs. For this purpose, monthly water and sediment samples were collected from Catú Lake, Ceará, Brazil, from March 2011 to February 2012...
January 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
B F Carvalho, C L S Ávila, P M Krempser, L R Batista, M N Pereira, R F Schwan
AIMS: This study was aimed to identify yeasts and moulds as well as to detect mycotoxin in corn silages in southern Minas Gerais, Brazil. METHODS AND RESULTS: Corn silages from 36 farms were sampled to analyse dry matter, crude protein, ether extract, ash, neutral detergent fibre, nonfibre carbohydrates and mycotoxins contents, yeasts and moulds population, pH and temperature values. The mycotoxins found in high frequency were aflatoxin in 77·7% of analysed samples, ochratoxin (33·3%) and zearalenone (22·2%)...
May 2016: Journal of Applied Microbiology
Yogesh Singh, Rani Gupta
A novel lipase encoding gene, TALipB from Trichosporon asahii MSR54 was heterologously expressed in Escherichia coli using three vectors, pET22b, pET28a & pEZZ18. The three recombinant proteins, viz. C-hexahistidine fused HLipB, N and C-hexahistidine fused HLipBH and ZZ-fused ZZLipB were purified using affinity chromatography. All the three enzymes were mid to long fatty acyl chain selective on p-NP esters and S-enantioselective irrespective of tags. HLipB had lowest activation energy (3.5 Kcal mol(-1)) and highest catalytic efficiency (254 mM(-1) min(-1)) on p-NP caprate followed by HLipBH and ZZLipB...
February 2016: Enzyme and Microbial Technology
Inam Danish Khan, Ajay Kumar Sahni, Atoshi Basu, Suboohi Haleem
Trichosporonosis is an emerging infection predominantly caused by Trichosporon asahii which is a ubiquitous and exclusively anamorphic yeast. T. asahii urinary tract infection is rare and remains scantily reported. T. asahii was isolated from urine of two immunocompetent patients who were receiving in-patient treatment for multiple comorbidities. T. asahii was identified phenotypically by a combination of manual and automated systems. Antifungal susceptibility done by E-test revealed multiresistance with preserved susceptibility to voriconazole...
October 2015: Medical Journal, Armed Forces India
Le Thi Nhi-Cong, Cung Thi Ngoc Mai, Nghiem Ngoc Minh, Hoang Phuong Ha, Do Thi Lien, Do Van Tuan, Dong Van Quyen, Michihiko Ike, Do Thi To Uyen
This article reports on the ability of yeast Trichosporon asahii B1 biofilm-associated cells, compared with that of planktonic cells, to transform sec-hexylbenzene and its metabolites. This B1 strain was isolated from a petroleum-polluted sediment collected in the QuangNinh coastal zones in Vietnam, and it can transform the branched aromatic hydrocarbons into a type of forming biofilm (pellicle) more efficiency than that the planktonic forms can. In the biofilm cultivation, seven metabolites, including acetophenone, benzoic acid, 2,3-dihydroxybenzoic acid, β-methylcinnamic acid, 2-phenylpropionic acid, 3-phenylbutyric acid, and 5-phenylhexanoic acid were extracted by ethyl acetate and analyzed by HPLC and GC-MS...
2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Mari Higashino-Kameda, Toshiki Yabe-Wada, Shintaro Matsuba, Kazuya Takeda, Kazushi Anzawa, Takashi Mochizuki, Koichi Makimura, Shinobu Saijo, Yoichiro Iwakura, Hirohisa Toga, Akira Nakamura
OBJECTIVES AND DESIGN: Hypersensitivity pneumonitis (HP) is a pulmonary disease caused by repeated exposure to various aspiration antigens, including bacteria and fungi. Although TLRs are known to be required for the generation of HP triggered by bacteria, the significance of fungal receptors remains unclear. The present study aimed to investigate whether Dectin-1 and Dectin-2 contribute to the development of experimental HP triggered by the fungus Trichosporon asahii (T. asahii) that causes summer-type HP...
March 2016: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
Michael A Washington, Jason C Barnhill, Megan A Duff, Jaclyn Griffin
Acute and chronic wound infections can both be encountered in the deployed setting. These wounds are often contaminated by bacteria and fungi derived from the external environment. In this article, we present the case of a wound infection simultaneously colonized by Enterobacter cloacae (a bacterial pathogen) and Trichosporon asahii (an unusual fungal pathogen). We describe the examination and treatment of the patient and review the distinguishing characteristics of each organism.
2015: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
Hisako Kushima, Issei Tokimatsu, Hiroshi Ishii, Jun-ichi Kadota
Most cases of deep-seated trichosporonosis develop in patients with neutropenia, but it has recently been reported that breakthrough infections with Trichosporon species can develop during the use of candin family of antifungal agents. This is due to the primary resistance of the causal fungus, Trichosporon asahii (T. asahii), to the candin agents. On the other hand, there has been a case report of infection with Trichosporon that presented high-level resistance to the azole family of antifungal agents. Therefore, the possibility that the frequent use of azole agents may lead to secondary resistance to these agents is a cause for concern...
2015: Medical Mycology Journal
Tomoe Ichikawa, Nao Yoshiyama, Yuzuha Ohgane, Reiko Ikeda
Trichosporon asahii is a pathogenic yeast that causes trichosporonosis, a deep-seated infection, in immunocompromised hosts. Pathogenic factors involved in this infection have not been investigated in detail, but morphological phenotype switching is thought to be important for T. asahii pathogenesis. Therefore, we analyzed adhesion, which may be a key early step in T. asahii infection, after morphological phenotype switching. T. asahii clinical isolates show several colony morphologies. In this study, colonies showing white-farinose (W), off-white-smooth (O), off-white-rugose (OR), smooth (S), and yellowish-white (Y) morphologies were obtained from three isolates and compared in an adhesion assay performed in cell culture dishes...
February 2016: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
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