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Antifungal Activity of the Biphosphinic Cyclopalladate C7a against Candida albicans Yeast Forms In Vitro and In Vivo

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Munoz, Julian E. ; Rossi, Diego C. P. ; Ishida, Kelly ; Spadari, Cristina C. ; Melhem, Marcia S. C. ; Garcia, Daniel M. ; Caires, Antonio C. F. ; Taborda, Carlos P. ; Rodrigues, Elaine G.
Número total de Autores: 9
Tipo de documento: Artigo Científico
Citações Web of Science: 5

Vulvovaginal and invasive candidiasis are frequent conditions in immunosuppressed individuals caused by Candida albicans and non-albicans Candida spp. Fluconazole and Amphotericin B are the main drugs used to fight the infection. However, resistance to fluconazole and other azole antifungal drugs is an important clinical problem that encourages the search for new therapeutic alternatives. In this work, we evaluate the antifungal activity of the biphosphinic cyclopalladate C7a in the in vitro and in vivo model. Our results showed fungicidal activity, with low values of minimal inhibitory concentrations and minimum fungicidal concentrations, even for fluconazole and/or miconazole resistant Candida isolates. Fluorescence microscopy and transmission electron microscopy revealed that the compound was able to inhibit the formation of hyphae/pseudohyphae and, moreover, promoted morphological alterations in cellular organelles and structures, such as disruption of cell wall, apparent mitochondrial swelling, chromatin marginalization into the nuclei and increased numbers of electronlucent vacuoles. C7a significantly decreased the biofilm formation and reduced the viability of yeast cells in mature biofilms when tested against a virulent C. albicans strain. In vivo assays demonstrated a significant decrease of fungal burden in local (vaginal canal) and disseminated (kidneys) infection. In addition, we observed a significant increase in the survival of the systemically infected animals treated with C7a. Our results suggest C7a as a novel therapeutic agent for vaginal and disseminated candidiasis, and an alternative for conventional drug-resistant Candida. (AU)

Processo FAPESP: 13/18655-3 - Paracoccidioides lutzii: desenvolvimento de vacina terapêutica a partir de antígenos específicos para serem utilizados em vacina combinada com o peptídeo P10 de P. brasiliensis
Beneficiário:Carlos Pelleschi Taborda
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/08760-1 - Paracoccidioides lutzii: novos desafios no desenvolvimento de uma vacina terapêutica. Fase 1: modelo experimental murino
Beneficiário:Diego Conrado Pereira Rossi
Linha de fomento: Bolsas no Brasil - Doutorado