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1.
ABCS health sci ; 46: e021203, 09 fev. 2021. tab
Article in English | LILACS | ID: biblio-1147180

ABSTRACT

INTRODUCTION: The resistance of fungal species to drugs usually used in clinics is of great interest in the medical field. OBJECTIVE: To evaluate susceptibility and in vitro response of species of Trichophyton spp. to antifungal drugs of interest in clinical medicine. METHODS: 12 samples of clinical isolates from humans were used, nine of T. mentagrophytes and three of T. tonsurans. Susceptibility tests were performed according to the agar diffusion (AD) and broth microdilution (BM) methods. RESULTS: In the AD method, the species T. tonsurans presented a percentage of sensitivity of 33% in relation to amphotericin B and 66% to itraconazole, with 100% resistance to ketoconazole and fluconazole. T. mentagrophytes also showed 100% resistance to ketoconazole in this technique, with 11% sensitivity to ketoconazole, 22% to itraconazole and 22% of samples classified as sensitive dose dependent. In the MC method, the species T. tonsurans presented a sensitivity percentage of 66%, 55% and 33% in relation to ketoconazole, fluconazole and itraconazole, respectively. The T. mentagrophytes species presented sensitivity percentages of 11%, 11%, 33% and 55% for amphotericin B, itraconazole, ketoconazole and fluconazole, respectively. CONCLUSION: There was resistance in vitro of the species of T. mentagrophytes and T. tonsurans against the antifungal fluconazole and relative resistance against ketoconazole in the AD method. In BM, however, important percentages of sensitivity were observed for the two species analyzed in relation to the antifungals fluconazole and ketoconazole when compared to itraconazole and amphotericin B.


INTRODUÇÃO: A resistência de espécies fúngicas às drogas usualmente empregadas no meio clínico é motivo de grande interesse na área médica. OBJETIVO: Avaliar susceptibilidade e resposta in vitro de espécies de Trichophyton spp. a drogas antifúngicas de interesse em clínica médica. MÉTODOS: Foram utilizadas 12 amostras de isolados clínicos de humanos, sendo nove de T. mentagrophytes e três de T. tonsurans. Foram realizados testes de susceptibilidade segundo os métodos de difusão em ágar (DA) e microdiluição em caldo (MC). RESULTADOS: No método de DA, a espécie T. tonsurans apresentou percentual de sensibilidade de 33% em relação à anfotericina B e de 66% ao itraconazol, com 100% de resistência frente ao cetoconazol e ao fluconazol. A espécie T. mentagrophytes também apresentou 100% de resistência frente ao cetoconazol nesta técnica, com 11% de sensibilidade ao cetoconazol, 22% ao itraconazol e 22% das amostras classificadas como sensível dose dependente. No método de MC, a espécie T. tonsurans apresentou percentual de sensibilidade de 66%, 55% e 33% em relação ao cetoconazol, fluconazol e itraconazol, respectivamente. A espécie T. mentagrophytes apresentou percentuais de sensibilidade de 11%, 11%, 33% e 55% para anfotericina B, itraconazol, cetoconazol e fluconazol, respectivamente. CONCLUSÃO: Houve resistência in vitro das espécies do T. mentagrophytes e T. tonsurans frente ao antifúngico fluconazol e resistência relativa frente ao cetoconazol no método de DA. Na MC, no entanto, foram observados importantes percentuais de sensibilidade das duas espécies analisadas frente aos antifúngicos fluconazol e cetoconazol quando comparadas ao itraconazol e à anfotericina B.


Subject(s)
Trichophyton/drug effects , Microbial Sensitivity Tests , Drug Resistance, Fungal , Disease Susceptibility/microbiology , Antifungal Agents/pharmacology , Tinea/microbiology , Tinea/drug therapy , Colony Count, Microbial , Fluconazole/pharmacology , Amphotericin B/pharmacology , Itraconazole/pharmacology , Ketoconazole/pharmacology
2.
Braz. j. med. biol. res ; 54(9): e10928, 2021. graf
Article in English | LILACS | ID: biblio-1278587

ABSTRACT

This study aimed to evaluate the frequency of cryptic Candida species from candidemia cases in 22 public hospitals in São Paulo State, Brazil, and their antifungal susceptibility profiles. During 2017 and 2018, 144 isolates were molecularly identified as 14 species; C. parapsilosis (32.6%), C. albicans (27.7%), C. tropicalis (14.6%), C. glabrata (9.7%), C. krusei (2.8%), C. orthopsilosis (2.8%), C. haemulonii var. vulnera (2.1%), C. haemulonii (1.4%), C. metapsilosis (1.4%), C. dubliniensis (1.4%), C. guilliermondii (1.4%), C. duobushaemulonii (0.7%), C. kefyr (0.7%), and C. pelliculosa (0.7%). Poor susceptibility to fluconazole was identified in 6.4% of C. parapsilosis isolates (0.12 to >64 µg/mL), 50% of C. guilliermondii (64 µg/mL), 66.6% of C. haemulonii var. vulnera (16-32 µg/mL), and C. duobushaemulonii strain (MIC 64 µg/mL). Our results corroborated the emergence of C. glabrata in Brazilian cases of candidemia as previously reported. Importantly, we observed a large proportion of non-wild type C. glabrata isolates to voriconazole (28.6%; <0.015 to 4 µg/mL) all of which were also resistant to fluconazole (28.6%). Of note, C. haemulonii, a multidrug resistant species, has emerged in the Southeast region of Brazil. Our findings suggested a possible epidemiologic change in the region with an increase in fluconazole-resistant species causing candidemia. We stress the relevance of routine accurate identification to properly manage therapy and monitor epidemiologic trends.


Subject(s)
Candida , Antifungal Agents/pharmacology , Brazil , Microbial Sensitivity Tests , Drug Resistance, Fungal , Hospitals
3.
Rev. Fac. Med. (Bogotá) ; 68(3): 463-466, July-Sept. 2020.
Article in English | LILACS, COLNAL | ID: biblio-1143736

ABSTRACT

Abstract Introduction: Candida auris is an opportunistic yeast associated with multiple infections, which was first reported in 2009 in Tokyo, Japan. Provided that it has great antifungal resistance to azoles and amphotericin B, its treatment options are limited, and therefore an empiric therapy using echinocandins such as micafungin should be considered. Case presentation: A rare case of a 48-year-old male patient with osteomyelitis caused by C. auris was reported in the city of Popayán, Colombia. The patient had a history of femoral head fracture, paraplegia due to firearm-related injury and neurogenic bladder, and reported having experienced abundant purulent foul-smelling secretions through trochanteric right ulcer for 15 days. MRI images revealed myositis and bone intensity alterations, which allowed diagnosing him with osteomyelitis. Due to repeated isolations of C. haemulonii in several bone samples, antifungal management was initiated. However, since no improvement in the patient's condition was observed, a culture was sent to the Colombian National Institute of Health to identify the pathogen considering the repeated isolations of C. haemulonii and its apparent resistance to antifungals. C. auris was finally confirmed as the pathogen. Conclusion: Osteomyelitis by C. auris is a rare entity, which must be considered when treating patients with predisposing risk factors such as long hospital stays, bearing in mind that this is an inpatient-associated opportunistic infection.


Resumen Introducción. Candida auris es una levadura oportunista asociada a múltiples infecciones que, en 2009, fue descrita por primera vez en Tokio, Japón. Dado que tiene una gran resistencia antifúngica a los azoles y a la anfotericina B, su manejo es limitado, por lo que se debe considerar iniciar un tratamiento empírico con equinocandinas como la micafungina. Presentación de caso. Caso inusual de osteomielitis por C. auris en un hombre de 48 años de Popayán, Colombia, con antecedentes de fractura de cabeza de fémur, paraplejia por herida con arma de fuego y vejiga neurogénica. El paciente tenía cuadro clínico de 15 días de evolución consistente en salida abundante de líquido purulento fétido en úlcera derecha por presión trocantérica. Mediante resonancia magnética se identificaron miositis y alteraciones de intensidad ósea, por lo que fue diagnosticado con osteomielitis. Debido a la identificación de aislamientos repetidos de Candida haemulonii en varias muestras óseas, se inició manejo antifúngico; sin embargo, ya que no se observó ninguna mejora en la condición del paciente, el cultivo fue enviado al Instituto Nacional de Salud para confirmar la identificación del patógeno debido a aislamientos repetidos de C. haemulonii y su aparente resistencia a los antifúngicos. Finalmente, el patógeno identificado fue C. auris. Conclusión. La osteomielitis por C. auris es una entidad inusual cuyo diagnóstico debe ser considerado en pacientes con factores de riesgo predisponente, como aquellos con larga estancia hospitalaria, ya que esta es una infección oportunista asociada a pacientes hospitalizados.


Subject(s)
Humans , Osteomyelitis , Drug Resistance, Fungal , Candida
4.
Rev. chil. infectol ; 37(3): 219-230, jun. 2020. tab, graf
Article in Spanish | LILACS | ID: biblio-1126113

ABSTRACT

Resumen Los azoles son fármacos que inhiben la enzima 14α-esteroldemetilasa, impidiendo la unión de ergosterol; esto altera la estructura y función de la pared celular fúngica. Especialmente el grupo de los triazoles: fluconazol, itraconazol, voriconazol, posaconazol e isavuconazol, son una alternativa farmacológica para el tratamiento de la enfermedad fúngica invasora causada por Aspergillus spp, Candida spp, Cryptococcus spp, patógenos emergentes como los Mucorales, y de micosis endémicas como las ocasionadas por Histoplasma spp y Coccidioides spp. Los efectos adversos de los triazoles son menos frecuentes comparados con los ocasionados por anfotericina B, un antifúngico de uso común para estas micosis. Los principales efectos adversos de los triazoles son hepáticos, gastrointestinales y cardiovasculares como la prolongación del intervalo QT. Las interacciones farmacológicas son usuales y se presentan con moléculas que usan sustratos del citocromo CYP3A4, lo que incluye anti-retrovirales, anti-tuberculosos e inmunomoduladores. En este trabajo se revisan la historia, características farmacológicas y los ensayos clínicos que evidencian su eficacia clínica en los diferentes escenarios clínicos.


Abstract The azoles are drugs that inhibit the 14α-sterol-demethylase enzyme preventing the binding of ergosterol, altering the functionality and structure of the fungal cell wall. Especially the group of triazoles: fluconazole, itraconazole, voriconazole, posaconazole and isavuconazole, are a pharmacological alternative for the treatment of the invasive fungal disease, caused by Aspergillus spp, Candida spp, Cryptococcus spp, by emerging pathogens for example, the Mucoral and finally of endemic mycosis as those caused by Histoplasma spp. and Coccidioides spp. The adverse effects of the triazoles are less frequent compared to those caused by amphotericin B, the main ones being hepatics, gastrointestinals and cardiovasculars, such as the prolongation of the QT interval. The pharmacological interactions are common and occur with molecules that use the substrates of the CYP3A4 cytochrome, for example: antiretroviral, anti-tuberculous and immunomodulators. The history, pharmacological characteristics and clinical trials are reviewed.


Subject(s)
Azoles/pharmacology , Microbial Sensitivity Tests , Fluconazole , Itraconazole , Drug Resistance, Fungal , Voriconazole , Antifungal Agents
5.
Pesqui. vet. bras ; 40(2): 102-106, Feb. 2020. tab, graf
Article in English | ID: biblio-1098449

ABSTRACT

Susceptibility testing is essential to inform the correct management of Aspergillus infections. In this study we present antifungal susceptibility profile of A. fumigatus isolates recovered from lungs of birds with and without aspergillosis. Fifty three isolates were tested for their antifungal susceptibility to voriconazole (VRC), itraconazole (ITZ), amphotericin (AMB) and caspofungin (CSP) using the M38-A2 broth microdilution reference method. Five isolates were resistant to more than one antifungal drug (CSP + AMB, VRC + ITZ and AMB + ITZ). Fifteen (28%) isolates with susceptible increased exposure (I) to ITZ were sensible to VRC. Resistance to AMB (>2µg/mL) was observed in only four isolates. Eleven (21%) A. fumigatus present resistance to ITZ (13%) and VRC (8%). Fungal isolation from respiratory samples has been regarded as being of limited usefulness in the ante mortem diagnosis of aspergillosis in birds. However, the results suggest that the detection and antifungal susceptibility profile may be helpful for monitoring of therapy for avian species and where antifungal resistance might be emerging and what conditions are associated to the event.(AU)


Os testes de suscetibilidade são essenciais para informar o correto manejo das infecções por Aspergillus. Neste estudo apresentamos o perfil antifúngico de isolados de A. fumigatus provenientes de pulmões de aves com e sem aspergilose. Cinqüenta e três isolados foram testados quanto à susceptibilidade antifúngica ao voriconazol (VRC), itraconazol (ITZ), anfotericina B (AMB) e caspofungina (CSP) pelo método de referência de microdiluição do caldo M38-A2. Cinco isolados foram resistentes a mais de um antifúngico (CSP + AMB, VRC + ITZ e AMB + ITZ). Quinze (28%) isolados suscetíveis - com exposição aumentada (I) ao ITZ foram sensíveis ao VRC. A resistência ao AMB (>2µg/mL) foi observada em apenas quatro isolados. Onze (21%) A. fumigatus apresentaram resistência a ITZ (13%) e VRC (8%). O isolamento de fungos de amostras respiratórias tem sido considerado de utilidade limitada no diagnóstico ante mortem de aspergilose em aves. No entanto, os resultados sugerem que a detecção e o perfil de suscetibilidade a antifúngicos podem ser úteis para o monitoramento da terapia de espécies aviárias, assim como a emergência da resistência antifúngica e quais condições podem estar associadas ao evento.(AU)


Subject(s)
Animals , Poultry Diseases , Aspergillosis/drug therapy , Aspergillosis/veterinary , Aspergillus fumigatus/isolation & purification , Aspergillus fumigatus/drug effects , Chickens , Drug Resistance, Fungal/drug effects , Antifungal Agents/therapeutic use
6.
Rev. Soc. Bras. Med. Trop ; 53: e20200013, 2020. tab, graf
Article in English | LILACS, ColecionaSUS, SES-SP | ID: biblio-1136810

ABSTRACT

Abstract Fusarium spp. has been associated with a broad spectrum of emerging infections collectively termed fusariosis. This review includes articles published between 2005 and 2018 that describe the characteristics, clinical management, incidence, and emergence of these fungal infections. Fusarium solani and F. oxysporum are globally distributed and represent the most common complexes. Few therapeutic options exist due to intrinsic resistance, especially for the treatment of invasive fusariosis. Therefore, the use of drug combinations could be an important alternative for systemic antifungal resistance. Increase in the number of case reports on invasive fusariosis between 2005 and 2018 is evidence of the emergence of this fungal infection.


Subject(s)
Humans , Communicable Diseases, Emerging/parasitology , Fusariosis/parasitology , Fusarium/classification , Antifungal Agents/administration & dosage , Brazil/epidemiology , Incidence , Communicable Diseases, Emerging/drug therapy , Communicable Diseases, Emerging/epidemiology , Drug Resistance, Fungal , Fusariosis/drug therapy , Fusariosis/epidemiology
7.
Rev. Soc. Bras. Med. Trop ; 53: e20190214, 2020. tab, graf
Article in English | LILACS | ID: biblio-1057290

ABSTRACT

Abstract INTRODUCTION: The aim of this study was to evaluate some virulence factors in Candida albicans isolates from patients with onychomycosis and determine the correlation between these factors and the antifungal resistance profile. METHODS: Seventy species of C. albicans were confirmed using polymerase chain reaction amplification of the HWP1 gene. According to the Clinical & Laboratory Standards Institute guidelines, the susceptibility profile of four antifungal agents was investigated, and the production of aspartyl protease, phospholipase, haemolysin, and biofilm was determined. The correlation between these profiles was also investigated. RESULTS: The isolates indicated different levels of resistance and production of virulence factors. Significant correlations were observed between the minimum inhibitory concentration (MIC) of fluconazole/itraconazole and biofilm production, between phospholipase production and fluconazole/itraconazole MIC, and between fluconazole MIC and hemolytic activity in C. albicans isolates. The results also showed significant correlations between phospholipase activity and biofilm production. CONCLUSIONS: Our findings will contribute to a better understanding of the pathogenesis of C. albicans and characterize the relationship between virulence factors and antifungal resistance, which may suggest new therapeutic strategies considering the possible involvement of the virulence mechanism in the effectiveness of treatment.


Subject(s)
Humans , Candida albicans/pathogenicity , Onychomycosis/microbiology , Virulence Factors , Antifungal Agents/pharmacology , Nails/microbiology , Phospholipases/biosynthesis , Candida albicans/drug effects , Candida albicans/ultrastructure , Microscopy, Electron, Scanning , Microbial Sensitivity Tests , Polymerase Chain Reaction , Biofilms/growth & development , Drug Resistance, Fungal , Aspartic Acid Proteases/biosynthesis , Hemolysis
8.
Rev. Pesqui. (Univ. Fed. Estado Rio J., Online) ; 12: 505-509, jan.-dez. 2020. tab
Article in English, Portuguese | LILACS, BDENF | ID: biblio-1097201

ABSTRACT

Objetivo: avaliar a eficácia antimicrobiana da terapia fotodinâmica no tratamento da candidíase oral em pessoas vivendo com HIV/aids. Método: estudo experimental, qualitativo e descritivo com 18 pessoas vivendo com HIV/aids que manifestavam a candidíase oral, maiores de 18 anos, que estavam em tratamento no Hospital Universitário Gaffrée e Guinle. Este grupo subdividiu-se em um grupo controle, composto por sete pessoas, que recebeu tratamento com a terapia fotodinâmica e antifúngicos, e um grupo experimental, com 11, que recebeu apenas a terapia fotodinâmica. A evolução do tratamento de cada participante foi acompanhada por registros fotográficos em duas consultas, inicial e final. Esta pesquisa foi aprovada pelo Comitê de Ética em Pesquisa do hospital, parecer número 2.431.107. Resultados: a maioria dos participantes apresentou melhora clínica, ainda que discreta, e em apenas um houve piora clínica. Conclusão: a terapia fotodinâmica antimicrobiana pode ser eficaz no tratamento da candidíase oral em pessoas vivendo com HIV/Aids


Objective: evaluate the antimicrobial efficacy of photodynamic therapy in the treatment of oral candidiasis in people living with HIV/ aids. Method: experimental, qualitative and descriptive study with 18 people living with HIV/aids who presented oral candidiasis, over 18 years of age, who were being treated at the Gaffrée and Guinle University Hospital. This group was subdivided into a control group, composed of seven people, who received treatment with photodynamic and antifungal therapy, and an experimental group, with 11, who received only the photodynamic therapy. The evolution of the treatment of each participant was followed by photographic registers in two appointments, initial and final. This research was approved by the Research Ethics Committee from the hospital, dictum number 2.431.107. Results: most of the participants showed clinical improvement, albeit discrete, and in only one there was clinical worsening. Conclusion: antimicrobial photodynamic therapy may be effective in the treatment of oral candidiasis in people living with HIV/Aids


Objetivo: evaluar la eficacia antimicrobiana de la terapia fotodinámica en el tratamiento de la candidiasis bucal en personas que viven con VIH/sida. Método: estudio experimental, cualitativo y descriptivo con 18 personas viviendo con VIH/sida que manifestaban la candidiasis bucal, mayores de 18 años, que estaban en tratamiento en el Hospital Universitario Gaffrée y Guinle. Este grupo se subdividió en grupo control, compuesto por siete personas, que recibió tratamiento con la terapia fotodinámica y antifúngicos, y un grupo experimental, con 11, que recibió sólo la terapia fotodinámica. La evolución del tratamiento de cada participante fue acompañada por registros fotográficos en dos consultas, inicial y final. La investigación fue aprobada por el Comité de Ética en Investigación del lugar, dictamen número 2.431.107. Resultados: la mayoría de los participantes presentó mejoría clínica, aunque discreta, y en apenas uno hubo empeoramiento clínico. Conclusión: la terapia fotodinámica antimicrobiana puede ser eficaz en el tratamiento de la candidiasis bucal en personas que viven con el VIH/Sida


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Aged, 80 and over , Photochemotherapy/statistics & numerical data , Candidiasis, Oral/therapy , AIDS-Related Opportunistic Infections/therapy , Photochemotherapy/methods , Candidiasis, Oral/epidemiology , Acquired Immunodeficiency Syndrome/therapy , HIV , Drug Resistance, Fungal
9.
Rio de Janeiro; s.n; 2020. 90 p. ilus.
Thesis in Portuguese | LILACS | ID: biblio-1178117

ABSTRACT

As espécies Cryptococcus neoformans e Cryptococcus gatti representam patógenos fúngicos ambientais encapsulados que afetam não apenas indivíduos imunocomprometidos, mas também indivíduos aparentemente imunocompetentes. No Brasil, a criptococose permanece sendo uma das infecções fúngicas sistêmicas mais importantes. Em humanos, a fagocitose de Cryptococcus hipocapsular por macrófagos foi associada com longo prazo de sobrevida do paciente. Com base no papel fundamental da cápsula criptocócica na doença, analisamos a diversidade de estruturas capsulares em 23 isolados de excretas de pombos, coletados nos municípios de Boa Vista, Bonfim e Pacaraima, no estado de Roraima (Norte do Brasil). Todos os isolados foram identificados como C. neoformans (genótipo VNI) por espectrometria de massa MALDI-TOF. Através de uma combinação de microscopia de fluorescência, citometria de fluxo, ELISA e métodos espectrofotométricos, cada isolado foi fenotipicamente caracterizado, o que incluiu medidas de taxas de crescimento a 30 e 37ºC, pigmentação, tamanho do corpo celular, dimensões capsulares, reatividade sorológica, produção de urease e capacidade de secreção de glucuronoxilomanana (GXM), o principal componente capsular de C. neoformans. Foi também avaliada a sensibilidade aos antifúngicos fluconazol e AmB. Com exceção da melanização, uma grande diversidade foi observada considerando todos os parâmetros testados em nosso estudo. Vale ressaltar que isolados hiper e hipo produtores de GXM foram identificados, além de isolados com perfis de hiper e hiporreatividade com o anticorpo monoclonal reconhecedor do polissacarídeo.


As dimensões capsulares também foram altamente variáveis nos isolados analisados. A produção de GXM extracelular foi correlacionada positivamente com dimensões capsulares, atividade da urease e tamanho da célula. Inesperadamente, as concentrações de GXM não se correlacionaram com a reatividade sorológica com a cápsula criptocócica. Os testes de sensibilidade aos antifúngicos revelaram alta sensibilidade dos isolados frente a AmB. Foram observados valores de susceptibilidade superiores para o fluconazol (8.0 µg/mL) em dois isolados (151A1 e 176A1) em comparação com a cepa padrão H99 / ATCC 208821 (2.0 µg/mL). Estes resultados revelam uma alta diversidade na capacidade de C. neoformans ambientais em produzir componentes capsulares, o que pode afetar o curso da criptococose humana. (AU)


Subject(s)
Humans , Cryptococcosis , Cryptococcus neoformans , Drug Resistance, Fungal , Drug Collateral Sensitivity
11.
Arq. bras. med. vet. zootec. (Online) ; 71(3): 819-827, May-June 2019. tab, graf
Article in English | ID: biblio-1011330

ABSTRACT

In this study, we described the antifungal activity of three Brazilian propolis extracts: brown, green and from jataí bees against Sporothrix brasiliensis. The extracts were obtained from ethanolic extraction and their chemical composition was determined by high-performance liquid chromatography coupled to mass spectrometry. The cellular toxicity was measured in MDBK (Madin-Darby Bovine Kidney) cells and quantified by the MTT assay (3- (4,5 dimethylthiazol-2yl -2,5-diphenyl-2H bromine tetrazolato). For antifungal activity, the minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) were determined by broth microdilution. The results showed that cell toxicity was not observed at lower concentrations (0.097 to 0.39μg/ml) for all extracts in comparison to cell control. Among the chemical compounds identified, caffeic acid, p-coumaric acid, chlorogenic acid, ferulic acid and rutin were quantified. In antifungal activity, green and jataí did not exhibit activity against the isolates (MIC and MFC greater than 0.78mg/ml). However, all isolates of S. brasiliensis were sensitive to brown propolis (MIC of 0.09 to 0.78mg/ml), including the standard strain (P<0.001). Among the Brazilian propolis studied, the brown propolis showed activity against the S. brasiliensis isolates and more studies should be undertaken in order to evaluate its promising use in the treatment of sporotrichosis.(AU)


Neste estudo, descreveu-se a atividade antifúngica de três extratos de própolis brasileiras: marrom, verde e de abelhas jataí (Tetragonisca angustula), contra Sporothrix brasiliensis. Os extratos foram obtidos de extração etanólica, e a sua composição química foi determinada por cromatografia líquida de alta eficiência, acoplada à espectrometria de massa. A toxicidade celular foi medida em células MDBK (Madin-Darby Bovine Kidney), avaliada por observação microscópica e quantificada pelo ensaio MTT (3- (4,5-dimetiltiazol-2-ilo -2,5-difenil-2H bromo tetrazolato). Para a atividade antifúngica, determinou-se a concentração inibitória mínima (CIM) e a concentração fungicida mínima (CFM) por meio de microdiluição em caldo. Os resultados mostraram que a toxicidade celular não foi observada em concentrações menores (0,097 a 0,39μg/ml). Entre os compostos químicos identificados, foram quantificados o ácido cafeico, ácido p-cumárico, ácido clorogênico, ácido ferúlico e a rutina. Na atividade antifúngica, as própolis verde e jataí não apresentaram atividade contra os isolados (CIM e CFM maior que 0,78mg/ml), porém todos os isolados de S. brasiliensis foram sensíveis à própolis marrom (CIM de 0,09 a 0,78mg/ml), incluindo a cepa padrão (P<0,001). Entre as própolis brasileiras estudadas, a marrom mostrou atividade contra S. brasiliensis, e mais estudos devem ser realizados para avaliar seu uso promissor no tratamento da esporotricose.(AU)


Subject(s)
Humans , Animals , Propolis/analysis , Propolis/therapeutic use , Sporothrix/isolation & purification , Itraconazole/therapeutic use , Drug Resistance, Fungal , Apitherapy/veterinary , Antifungal Agents/analysis
12.
Rev. iberoam. micol ; 36(2): 55-60, 2019. tab
Article in English | LILACS, ColecionaSUS, CONASS, SES-RS | ID: biblio-1121303

ABSTRACT

Background: The number of fungal infections has increased in recent years in Rio Grande do Sul (RS), Brazil. Epidemiological studies are important for proper control of infections. Aims: To evaluate the etiology of fungal infections in patients in RS, from 2003 to 2015. Methods: This is a retrospective and longitudinal study carried out at Mycology Department of Central Laboratory of RS; 13,707 samples were evaluated. The variables sex, age, site of infection, and etiologic agent were analyzed. Susceptibility of Candida to fluconazole was tested in samples collected in 2015from 51 outpatients. Results: Of the 13,707 samples, 840 cases (6.12%) of fungal infections were found and included in the analyses; female gender accounted for the 55.9% of the cases. The main fungus was Candida albicans (450 cases, 53.38%; p < 0.001). Onychomycosis was the most frequent infection in superficial mycoses. Systemic mycoses accounted for 54.05% of the cases, from which 68.8% occurred in males, mainly HIVpositive (33.11%), and the main etiologic agent in these cases was Cryptococcus neoformans (73.13%). Among 51 samples tested for susceptibility to fluconazole, 78.43% of Candida isolates were susceptible; 5.88% were susceptible in a dose-dependent manner, and 15.69% were resistant. Conclusions: C. albicans is a common cause of fungal infections in RS, accounting for half of the cases;resistance to antifungals was found in non-hospitalized patients. In addition, women seem to be moresusceptible to fungal infections than men, however men show more systemic mycoses than women. Thenails are the most common site of infection. (AU)


Subject(s)
Humans , Male , Female , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Adult , Middle Aged , Fungi/classification , Mycoses/epidemiology , Brazil/epidemiology , Fluconazole/pharmacology , Prevalence , Retrospective Studies , Longitudinal Studies , Drug Resistance, Fungal , Fungi/drug effects
13.
Article in English | WPRIM | ID: wpr-773417

ABSTRACT

OBJECTIVE@#To evaluate the synergy of the Burkholderia signaling molecule cis-2-dodecenoic acid (BDSF) and fluconazole (FLU) or itraconazole (ITRA) against two azole-resistant C. albicans clinical isolates in vitro and in vivo.@*METHODS@#Minimum inhibitory concentrations (MICs) of antibiotics against two azole-resistant C. albicans were measured by the checkerboard technique, E-test, and time-kill assay. In vivo antifungal synergy testing was performed on mice. Analysis of the relative gene expression levels of the strains was conducted by quantitative reverse-transcription polymerase chain reaction (qRT-PCR).@*RESULTS@#BDSF showed highly synergistic effects in combination with FLU or ITRA with a fractional inhibitory concentration index of ⪕ 0.08. BDSF was not cytotoxic to normal human foreskin fibroblast cells at concentrations of up to 300 μg/mL. The qRT-PCR results showed that the combination of BDSF and FLU/ITRA significantly inhibits the expression of the efflux pump genes CDR1 and MDR1 via suppression of the transcription factors TAC1 and MRR1, respectively, when compared with FLU or ITRA alone. No dramatic difference in the mRNA expression levels of ERG1, ERG11, and UPC2 was found, which indicates that the drug combinations do not significantly interfere with UPC2-mediated ergosterol levels. In vivo experiments revealed that combination therapy can be an effective therapeutic approach to treat candidiasis.@*CONCLUSION@#The synergistic effects of BDSF and azoles may be useful as an alternative approach to control azole-resistant Candida infections.


Subject(s)
Antifungal Agents , Pharmacology , Burkholderia cenocepacia , Chemistry , Candida albicans , Physiology , Candidiasis , Drug Therapy , Drug Resistance, Fungal , Fatty Acids, Monounsaturated , Fluconazole , Pharmacology , Humans , Microbial Sensitivity Tests , Triazoles , Metabolism
14.
Article in English | WPRIM | ID: wpr-776892

ABSTRACT

Antifungal drug resistance is a significant clinical problem, and antifungal agents that can evade resistance are urgently needed. In infective niches, resistant organisms often co-existed with sensitive ones, or a subpopulation of antibiotic-susceptible organisms may evolve into resistant ones during antibiotic treatment and eventually dominate the whole population. In this study, we established a co-culture assay in which an azole-resistant Candida albicans strain was mixed with a susceptible strain labeled with green fluorescent protein to mimic in vivo conditions and screen for antifungal drugs. Fluconazole was used as a positive control to verify the validity of this co-culture assay. Five natural molecules exhibited antifungal activity against both susceptible and resistant C. albicans. Two of these compounds, retigeric acid B (RAB) and riccardin D (RD), preferentially inhibited C. albicans strains in which the efflux pump MDR1 was activated. This selectivity was attributed to greater intracellular accumulation of the drugs in the resistant strains. Changes in sterol and lipid compositions were observed in the resistant strains compared to the susceptible strain, and might increase cell permeability to RAB and RD. In addition, RAB and RD interfered with the sterol pathway, further aggregating the decrease in ergosterol in the sterol synthesis pathway in the MDR1-activated strains. Our findings here provide an alternative for combating resistant pathogenic fungi.


Subject(s)
ATP-Binding Cassette Transporters , Genetics , Metabolism , Antifungal Agents , Chemistry , Metabolism , Pharmacology , Azoles , Pharmacology , Biosynthetic Pathways , Genetics , Candida albicans , Chemistry , Metabolism , Cell Membrane , Chemistry , Metabolism , Coculture Techniques , Drug Resistance, Fungal , Ergosterol , Metabolism , Fungal Proteins , Genetics , Metabolism , Lipids , Chemistry , Molecular Structure , Permeability , Phenyl Ethers , Chemistry , Metabolism , Pharmacology , Sterols , Chemistry , Metabolism , Stilbenes , Chemistry , Metabolism , Pharmacology , Triterpenes , Chemistry , Metabolism , Pharmacology
15.
Clin. biomed. res ; 39(4): 341-345, 2019.
Article in Portuguese | LILACS | ID: biblio-1087506

ABSTRACT

O gênero Candida possui várias espécies conhecidas e que podem tornar-se patogênicas em determinadas situações. Candida blankii é uma espécie emergente que, na última década, foi identificada como um agente de doenças sistêmicas. Ainda não existe um protocolo de tratamento específico, apesar de que n os poucos casos registrados na literatura a terapia adotada foi efetiva. O objetivo deste estudo foi realizar uma revisão bibliográfica para coletar informações relevantes sobre este patógeno como um possível agente etiológico em infecções sistêmicas, bem como sua epidemiologia e os aspectos de sua patogenicidade. (AU)


The genus Candida has several known species and may become pathogenic in certain situations. Candida blankii is an emerging species that in the past decade has been identified as an agent of systemic diseases. There is no specific treatment protocol yet, although in the few cases reported in the literature the therapy adopted was effective. The objective of this study was to conduct a literature review to collect relevant information about this pathogen as a possible etiological agent in systemic infections, as well as its epidemiology and aspects of pathogenicity. (AU)


Subject(s)
Humans , Candida/classification , Candida/drug effects , Candida/pathogenicity , Communicable Diseases, Emerging/genetics , Drug Resistance, Fungal/genetics , Disease Susceptibility/epidemiology
16.
Univ. med ; 60(1)2019. tab
Article in English | LILACS, COLNAL | ID: biblio-995036

ABSTRACT

Introducción: Candida spp. es una levadura comensal de la microbiota humana. Por características del hospedero, las infecciones del torrente sanguíneo pueden aparecer y causar una gran morbimortalidad. Métodos: Estudio restrospectivo transversal analítico de los cultivos positivos para Candida spp. entre 2008 y 2014 en un hospital universitario en Bogotá, Colombia. Se evaluaron las características clínicas y microbiológicas presentes previo a la toma de la primera muestra de sangre positiva y se determinaron asociaciones con infecciones por especies no C. albicans (NCA). Resultados: Se incluyeron 123 casos de candidemia. C. albicans fue la especie más aislada (42 %). Sin embargo, las especies NCA como grupo fueron observadas más frecuentemente. Más del 70 % de los casos presentaron manejo en la unidad de cuidado intensivo, con una mediana de estancia de 14 días previo a la primera muestra de sangre positiva. Se detectaron numerosas características médicas; sin embargo, ninguna estuvo asociada con candidemia por especies NCA. Se observó resistencia a por lo menos un antifúngico en el 29 % de los casos, aunque en una muestra reducida de pruebas de sensibilidad. Conclusiones: Nuestros resultados sustentan el viraje mundial hacia la candidemia por especies NCA; pero no encontramos asociaciones clínicas en este grupo. Debe dársele prioridad a la identificación de factores de riesgo y a la optimización de los puntajes de predicción, que permitan identificar pacientes en riesgo que se beneficien de terapia preventiva.


Introduction: Candida species are commensal yeasts of the human microbiota. However, due to several host's conditions, bloodstream infections may arise causing high morbimortality. Methods: Retrospective cross-sectional analytical study of positive blood cultures for Candida spp. between 2008'2014 at a university hospital in Bogotá. Colombia. We evaluated clinical and microbiological characteristics prior to the first positive blood sample was obtained and determined associations with non'C. albicans (NCA) species infections. Results: We included 123 candidemia cases. C. albicans was the most frequently isolated species (42%). However; NCA species as a group were observed more often. Over 70% of cases were managed at the ICU, with a median stay of 14 days. Several medical factors were frequently observed, however none appeared to be associated with NCA species candidemia. Resistance to at least one antifungal agent was observed in 29% of cases, although a reduced sample of susceptibility tests was available. Conclusions: Our results support a worldwide shift towards NCA candidemia. However, clinical features were not associated with NCA infections. The identification of risk factors and the improvement of prediction scores must be prioritized, in order to identify' patients at high risk who may benefit of pre-emptive therapy.


Subject(s)
Candidiasis/epidemiology , Drug Resistance, Fungal , Candidemia/history
17.
Rev. Soc. Bras. Med. Trop ; 52: e20180473, 2019. tab
Article in English | LILACS | ID: biblio-990445

ABSTRACT

Abstract INTRODUCTION: Candidiasis is the most frequent opportunistic mycosis in humans and can cause mortality, particularly in immunodeficient patients. One major concern is the increasing number of infections caused by drug-resistant Candidas trains, as these cannot be efficiently treated with standard therapeutics. The most common mechanism of fluconazole resistance in Candida is mutation of ERG11, a gene involved in the biosynthesis of ergosterol, a compound essential for cell integrity and membrane function. METHODS: Based on this knowledge, we investigated polymorphisms in the ERG11 gene of 3 Candida species isolated from immunocompromised and immunocompetent patients. In addition, we correlated the genetic data with the fluconazole susceptibility profile of the Candida isolates. RESULTS: A total of 80 Candida albicans, 8 Candida tropicalis and 6 Candida glabrata isolates were obtained from the saliva of diabetic, kidney transplant and immunocompetent patients. Isolates were considered susceptible to fluconazole if the minimum inhibitory concentration was lower than 8 μg/mL. The amino acid mutations F105L, D116E, K119N, S137L, and K128T were observed in C. albicans isolates, and T224C and G263A were found in C. tropicalis isolates. CONCLUSIONS: Despite the high number of polymorphisms observed, the mutations occurred in regions that are not predicted to interfere with ergosterol synthesis, and therefore are not related to fluconazole resistance.


Subject(s)
Humans , Male , Female , Adult , Aged , Polymorphism, Genetic/drug effects , Candida/drug effects , Candida/genetics , Fluconazole/pharmacology , Kidney Transplantation , Diabetes Mellitus/microbiology , Antifungal Agents/pharmacology , Reference Values , Saliva/microbiology , Candida/isolation & purification , DNA, Fungal/genetics , Microbial Sensitivity Tests , Polymerase Chain Reaction , Drug Resistance, Fungal/genetics , Immunocompetence , Middle Aged , Mutation/drug effects
18.
Int. arch. otorhinolaryngol. (Impr.) ; 22(4): 400-403, Oct.-Dec. 2018. tab
Article in English | LILACS | ID: biblio-975604

ABSTRACT

Abstract Introduction Otomycosis is a common problem in otolaryngology practice. However, we usually encounter some difficulties in its treatment because many patients show resistance to antifungal agents, and present high recurrence rate. Objectives To determine the fungal pathogens that cause otomycosis as well as their susceptibility to the commonly used antifungal agents. Additionally, to discover the main reasons for antifungal resistance. Methods We conducted an experimental descriptive study on 122 patients clinically diagnosed with otomycosis from April 2016 to April 2017. Aural discharge specimens were collected for direct microscopic examination and fungal culture. In vitro antifungal susceptibility testing was performed against the commonly used antifungal drugs. We tested the isolated fungi for their enzymatic activity. Results Positive fungal infection was found in 102 samples. The most common fungal pathogens were Aspergillus and Candida species, with Aspergillus niger being the predominant isolate (51%). The antifungal susceptibility testing showed that mold isolates had the highest sensitivity to voriconazole (93.48%), while the highest resistance was to fluconazole (100%). For yeast, the highest sensitivity was to nystatin (88.24%), followed by amphotericin B (82.35%), and the highest resistance was to terbinafine (100%), followed by Itraconazole (94.12%). Filamentous fungi expressed a high enzymatic ability, making them more virulent. Conclusion The Aspergillus and Candida species are the most common fungal isolates in otomycosis. Voriconazole and Nystatin are the medications of choice for the treatment of otomycosis in our community. The high virulence of fungal pathogens is owed to their high enzymatic activity. Empirical use of antifungals should be discouraged.


Subject(s)
Humans , Male , Female , Infant , Child, Preschool , Child , Adolescent , Adult , Middle Aged , Aged , Drug Resistance, Fungal , Otomycosis/microbiology , Fungi/isolation & purification , Antifungal Agents/pharmacology , Aspergillus/isolation & purification , Aspergillus niger/isolation & purification , Yeasts/isolation & purification , Candida/isolation & purification , Microbial Sensitivity Tests , Amphotericin B/pharmacology , Epidemiology, Descriptive , Epidemiology, Experimental , Itraconazole/pharmacology , Voriconazole/pharmacology , /pharmacology
19.
Rev. chil. infectol ; 35(4): 377-385, ago. 2018. tab
Article in Spanish | LILACS | ID: biblio-978048

ABSTRACT

Resumen Introducción: Se desconocen los factores asociados a la candidiasis oral en población pediátrica con infección por VIH de los países en desarrollo. Objetivo: Identificar los factores asociados a la colonización por Candida, candidiasis oral y la susceptibilidad in vitro a antifúngicos, en niños y adolescentes con infección por VIH institucionalizados en la ciudad de Tijuana, México. Materiales y Métodos: Se examinó la cavidad oral de 30 niños y adolescentes con infección por VIH, se obtuvo una muestra de la mucosa oral para identificar las especies de Candida mediante cultivo y auxonograma. La susceptibilidad a los antifúngicos se determinó de acuerdo al CLSI. Los indicadores del estado inmunológico y falla virológica se clasificaron conforme a la OMS. Resultados: Se identificaron seis especies de Candida, 53% colonizantes y 47% causantes de candidiasis. Los factores asociados a candidiasis fueron alta carga viral (p = 0,001), menor recuento de LTCD4+ (p = 0,002) y esquema TARAA (p ≤ 0,014). La especie prevalente fue C. glabrata (33%); sin embargo, C. albicans (27%) fue más resistente a fluconazol (p = 0,001). Las especies resistentes a itraconazol se identificaron en esquemas que incluyen un INNTR (p = 0,041). Conclusiones: Los niños y adolescentes con infección por VIH institucionalizados mostraron una prevalencia elevada de Candida spp. colonizante y resistencia a los antifúngicos relacionada con los INNTR .


Background: Factors associated with candidiasis and colonization in HIV-positive children and adolescents in developing countries are not well understood. Aim: To identify the factors associated with oral Candida colonization and candidiasis in institutionalized HIV-positive children and adolescents in Tijuana, México, as well as the response of the isolates to antifungals. Materials and Methods: Sample of the oral mucosa of 30 HIV positive children and adolescents were obtained to isolate and identify Candida species by culture and metabolic profile. Antifungal drugs susceptibility was determined according to CLSI. Indicators of immunological and virologic failure were classified in accordance to WHO criteria. Results: Six Candida species were identified from oral mucosa, 53% colonizers and 47% in candidiasis. Factors associated with candidiasis and oral colonization were viral load (p = 0,001), CD4+ counts (p = 0,002) and HAART regimen (p ≤ 0,014). The most prevalent species was C. glabrata (33%), but C. albicans (27%) was more resistant to fluconazole (p = 0,001). Itraconazol resistant species were identified in regimens that include an NNRTI (p = 0,041). Conclusion: HIV-positive children and adolescents living in an orphanage showed high prevalence of colonizing Candida spp. and resistance to antifungals, related to NNRTI.


Subject(s)
Humans , Male , Female , Infant , Child, Preschool , Child , Adolescent , Adult , Young Adult , Candida albicans/isolation & purification , Candidiasis, Oral/microbiology , HIV Infections/complications , AIDS-Related Opportunistic Infections/microbiology , Mouth Mucosa/microbiology , Candida albicans/classification , Candidiasis, Oral/classification , Candidiasis, Oral/drug therapy , Fluconazole/therapeutic use , HIV Infections/drug therapy , Cross-Sectional Studies , Prospective Studies , Risk Factors , AIDS-Related Opportunistic Infections/drug therapy , Itraconazole/therapeutic use , Viral Load , Drug Resistance, Fungal , Mexico , Antifungal Agents/therapeutic use
20.
An. bras. dermatol ; 93(3): 462-464, May-June 2018. tab
Article in English | LILACS | ID: biblio-1038269

ABSTRACT

Abstract: The number of new cases of emerging fungal infections has increased considerably in recent years, mainly due to the large number of immunocompromised individuals. The objective of this study was to evaluate the susceptibility of emerging fungi to fluconazole, itraconazole and amphotericin B by disk diffusion method. In 2015, 82 emerging fungi were evaluated in IPB-LACEN/RS and 13 (15.8%) were resistant: 10/52 were from superficial mycoses and 3/30 from systemic mycoses. The data from the study point to the need for permanent vigilance regarding the careful evaluation in the prescription and clinical and laboratory follow-up of patients affected by fungal infections.


Subject(s)
Humans , Male , Female , Adult , Aged , Drug Resistance, Fungal , Fungi/drug effects , Antifungal Agents/therapeutic use , Microbial Sensitivity Tests , Fluconazole/therapeutic use , HIV Infections/complications , Amphotericin B/therapeutic use , Itraconazole/therapeutic use , Fungi/isolation & purification , Mycoses/microbiology , Mycoses/drug therapy , Antifungal Agents/pharmacology
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