Características genotípicas e fenotípicas de Candida Albicans isoladas da cavidade bucal de pacientes transplantados renais com ênfase na ação do extrato bruto de Eugenia uniflora em fatores de virulência

• Ano de defesa: 2013
• Autor(a) principal: Silva, Walicyranison Plinio da
• Orientador(a): Chaves, Guilherme Maranhão
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio Grande do Norte
• Programa de Pós-Graduação: Programa de Pós-Graduação em Ciências Farmacêuticas
• Departamento: Bioanálises e Medicamentos
• País: BR
• Palavras-chave em Português: Candida albicans. Candidíase oral. Pacientes transplantados renais. Genotipagem. Fatores de virulência. Eugenia uniflora. Produtos naturais
• Palavras-chave em Inglês: Candida albicans. Oral candidiasis. Kidney transplant recipients. Genotyping. Virulence factors. Eugenia uniflora. Natural products
• Área do conhecimento CNPq: CNPQ::CIENCIAS DA SAUDE::FARMACIA
• Link de acesso: https://repositorio.ufrn.br/jspui/handle/123456789/13499

Candida albicans is a diploid yeast that in some circumstances may cause oral or oropharyngeal infections. The investigation of natural products is mandatory for the discovery of new targets for antifungal drugs development. This study aimed to determine the genotypes of 48 clinical isolates of C. albicans obtained from the oral cavity of kidney transplant patients from two distinct geographic regions of Brazil. In addition, we investigated three virulence factors in vitro: phospholipase activity, morphogenesis and the ability to evade from polymorphonuclear neutrophils. The expression of these virulence factors in vitro was also investigated in the presence of the crude extract of Eugenia uniflora. The genotype A was the most prevalent (30 isolates; 62.5%), followed by genotype C (15 isolates; 31.5%) and genotype B (3 isolates; 6.25%). When microsatellite technique with primer M13 was applied, 80% of the isolates from the South were placed within the same cluster. All Genotype C strains were grouped together within two different clusters. Genotype C was considered more resistant to PMNs attack than genotypes A and B. Strains isolated from the South of Brazil showed higher ability to combat PMNs phagocytosis. We found a high rate of genotype C strains isolated from the oral cavity of this group of patients. The crude extract of E. uniflora inhibited proper hypha formation and phagocytosis by PMNs, but had no significant effect on phospholipase activity. This study characterized oral C. albicans strains isolated from kidney transplant recipients and will contribute for the better understanding of the pathogenesis and alternative therapeutics for oral candidiasis