Identificação molecular, virulência e suscetibilidade aos antifúngicos das espécies do complexo Candida parapsilosis
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2014-08-26
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Universidade Federal de Goiás
Resumo
The Candida species are associated with clinical manifestations that can characterize from superficial infections up to systemic involvement. Non-albicans species are considered emerging, and Candida parapsilosis is the main etiological agent in several casuistics. The secondary alcohol dehydrogenase (SADH) gene amplification and restriction fragment analysis by enzyme digestion BanI allows differentiation of C. parapsilosis in a species complex formed by C. parapsilosis sensu stricto, C. orthopsilosis and C. metapsilosis that may present behaviors different virulence and response to antifungal agents. Thus, this study aims to identify the species of the C. parapsilosis complex, obtained from mycology collection of the Mycology Laboratory of the Institute of Tropical Pathology and Public Health, Federal University of Goiás, using molecular methods, as well as the characterization of factors virulence and in vitro susceptibility to different antifungal agents. For the distinction between the species, was performed a polymerase chain reaction followed by digestion with restriction enzyme BanI. After the identification of 87 isolates from blood (54) and nails (33), the determination of virulence factors such as proteases, esterase, phospholipase, hemolysins, adhesion, biofilm formation and switching phenomenon were performed. The profile of in vitro susceptibility to amphotericin B, fluconazole, itraconazole, voriconazole, posaconazole and caspofungin were performed using the Etest® method. The results showed that C. parapsilosis sensu stricto is the most common in our region (78), followed by C.orthopsilosis (5) C. metapsilosis (4). There was no difference between the behavior of virulence by the three species, but noted that there is divergence in the susceptibility to antifungal agents. Isolates of C. parapsilosis sensu stricto were less susceptible to amphotericin B, itraconazole and caspofungin compared with the susceptibility patterns of C. orthopsilosis and C. metapsilosis. A percentage of 10.2% of the isolates of C. parapsilosis sensu stricto no were susceptible to caspofungin. This paper reports the first identification of species of the C. parapsilosis complex in the state of Goiás, Brazil, and shows the importance of determining antifungal susceptibility to appropriate therapy.
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ATAÍDES, F. S. Identificação molecular, virulência e suscetibilidade aos antifúngicos das espécies do complexo Candida parapsilosis. 2014. 132 f. Tese (Doutorado em Medicina Tropical e Saúde Publica) - Universidade Federal de Goiás, Goiânia, 2014.