In vitro differential activity of phospholipases and acid proteinases of clinical isolates of Candida

Revista da Sociedade Brasileira de Medicina Tropical

Aurean D'eça Júnior²  Anderson França Silva¹  Fernanda Costa Rosa²  Sílvio Gomes Monteiro²  Patrícia De Maria Silva Figueiredo²  Cristina De Andrade Monteiro² 

[1] ,Centro Universitário do Maranhão Núcleo de Doenças Infecciosas e Parasitárias São Luis MA

关键词: Candida;    Virulence factors;    Phospholipases;    Proteases;    Candida;    Fatores de virulência;    Fosfolipases;    Proteinases;   

DOI  :  10.1590/S0037-86822011005000036

来源: SciELO

【 摘 要 】

INTRODUCTION: Candida yeasts are commensals; however, if the balance of normal flora is disrupted or the immune defenses are compromised, Candida species can cause disease manifestations. Several attributes contribute to the virulence and pathogenicity of Candida, including the production of extracellular hydrolytic enzymes, particularly phospholipase and proteinase. This study aimed to investigate the in vitro activity of phospholipases and acid proteinases in clinical isolates of Candida spp. METHODS: Eighty-two isolates from hospitalized patients collected from various sites of origin were analyzed. Phospholipase production was performed in egg yolk medium and the production of proteinase was verified in a medium containing bovine serum albumin. The study was performed in triplicate. RESULTS: Fifty-six (68.3%) of isolates tested were phospholipase positive and 16 (44.4%) were positive for proteinase activity. C. tropicalis was the species with the highest number of positive isolates for phospholipase (91.7%). Statistically significant differences were observed in relation to production of phospholipases among species (p<0,0001) and among the strains from different sites of origin (p=0.014). Regarding the production of acid protease, the isolates of C. parapsilosis tested presented a larger number of producers (69.2%). Among the species analyzed, the percentage of protease producing isolates did not differ statistically (χ2=1.9 p=0.5901 (χ2=1.9 p=0.5901). CONCLUSIONS: The majority of C. non-albicans and all C. albicans isolates were great producers of hydrolytic enzymes and, consequently, might be able to cause infection under favorable conditions.

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