Navegando por Assunto "Fonsecaea pedrosoi"

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Acesso aberto (Open Access)
Análise da interação in vitro entre Fonsecaea pedrosoi e macrofagos peritoneais de camundongos C57/BL6 e BALB/c
(Universidade Federal do Pará, 2008-04-02) YAMANO, Suellen Sirleide Pereira; SALGADO, Claudio Guedes; http://lattes.cnpq.br/2310734509396125
Chromoblastomycosis (CBM) is a chronic, subcutaneous, granulomatous infection caused by traumatic implantation in the skin of several dematiaceous fungi, usually Fonsecaea pedrosoi. Brazil has second highest disease prevalence in the world and Para State is the most endemic area. Histologically, CBM is characterized by the presence of multinucleated giant cells and sclerotic cells can be found engulfed by macrophages. The objective of this study was to analyze the different aspects of interaction between peritoneal macrophages from BALB/c or C57/BL6 mice with F. pedrosoi conidia or sclerotic cells, calculating infection, phagocytosis and cellular fusion rates. The results showed phagocytosis and infection rates with conidia higher than sclerotic cells to BALB/c (p <0.05), while the rate of cellular fusion was higher for sclerotic cells interaction, with Langhans giant cells formation, in comparison to foreign-body giant cells after interaction with conidia. Macrophages from BALB/c co-cultured with conidia produced more TNF-α than control group after 3 to 72 hours, and more IL-10 after 3h. Macrophages interacting with sclerotic cells produced more TNF-α than control group after 1h and 3h, and the amount of IL-10 was higher after 72h of interaction. In the co-culture of C57/BL6 macrophages with conidia, the presence of large vacuoles after 24h was observed, while in the coculture with sclerotic cells, macrophages were detached from coverslip glasses after 24 h. Our results indicate higher levels of TNF-α after interaction of conidia compared to controls at 1 and 72 h and increase of IL-10 after 48h. However, after interaction with sclerotic cells, only IL-10 differed from control, being higher after 1 to 48 hours. All of these data suggest that macrophage response to fungus is different between BALB/c and C57/BL6 mice, differing also on the response of the same type macrophage for each fungal form, sclerotic cells apparently being more immunogenic than conidia.
Acesso aberto (Open Access)
Análise morfológica in vitro da ação de antifúngicos em cepas de Fonsecaea pedrosoi
(Universidade Federal do Pará, 2014-02-21) MASSOUD JUNIOR, Heleno Ramos; SALGADO, Claudio Guedes; http://lattes.cnpq.br/2310734509396125
Choromoblastomycosis (CBM) is a disease caused by traumatic implantation of many species of melanized fungi. The State of Pará is the major endemic area in Brazil and Fonsecaea pedrosoi is the major etiological agent. The treatment is not standardized and many forms of interventions are related in the literature. In the other hand, the in vitro susceptibility test to antifungal drugs may help in the therapeutic choice and in the identification of resistant strains. The objective of this work is to evaluate the in vitro susceptibility of 20 F. pedrosoi clinical isolates to itraconazole (ITZ), ketoconazole (KCZ), fluconazole (FCZ) and terbinafine (TBF) as well as the possible morphological alterations induced by ITZ or TBF in the Minimal Inhibitory Concentration (MIC) and high concentrations. The tests were performed according to the Clinical and Laboratory Standards Institute (CLSI, M38-A2 document) recommendations. The final concentrations of ITZ, TBF and KCZ in each test were to 16 to 0.03 μg/mL. To FCZ the final concentrations were to 64 to 0.125 μg/mL. The MIC was defined as the lowest drug concentration that inhibit 100% the visual growth when compared to the non-treated group after five days of incubation at 30°C. ITZ proved to be the most effective drug in vitro against F. pedrosoi (CIM 90= 1μg/mL). TBF showed a low drug activity with 70% of the isolates with MIC ≥ 0.5 μg/mL. The conidia morphological analysis revealed an increasing in the diameter, an interruption of the cellular division and the formation of little chains after the treatment with ITZ in the MIC. At the high concentration used in the susceptibility test we noticed an irregular shape, a detachment of pigmented material from the cell wall and a vacuolization. Rupture in cell wall and amorphous conidia were observed at 32 μg/mL and 64 μg/mL. Significant alterations were not observed after treatment with TBF at the same concentrations. Moreover, the 5-fluorocytocise (5-FC) and FCZ do not stop the conidia growth at high concentrations. However, ultrastructure alterations were noticed after treatment with 5-FC 64 μg/mL. Thus, it is suggested a different morphological pattern after ITZ or TBF treatment during the in vitro susceptibility test. In synthesis, ITZ shown better in vitro antifungal activity while 5-FC only provoked structures alterations in the highest concentration tested.
Acesso aberto (Open Access)
Isolation of Fonsecaea pedrosoi from thorns of Mimosa pudica, a probable natural source of chromoblastomycosis
(2004-02) SALGADO, Claudio Guedes; SILVA, Jorge Pereira da; DINIZ JUNIOR, José Antônio Picanço; SILVA, Moisés Batista da; COSTA, Patricia Fagundes da; TEIXEIRA, Cláudio Eduardo Corrêa; SALGADO, Ubirajara Imbiriba
We report the isolation of Fonsecaea pedrosoi from thorns of the plant Mimosa pudica L. at the place of infection identified by one of our patients. Clinical diagnosis of chromoblastomycosis was established by direct microscopic examination and cultures from the patient's lesion. The same species was isolated from the patient and from the plant. Scanning electron microscopy of the surface of the thorns showed the characteristic conidial arrangement of F. pedrosoi. These data indicate that M. pudica could be a natural source of infection for the fungus F. pedrosoi.