Abstract
Paracoccidioides brasiliensis is a thermodimorphic fungus associated with paracoccidioidomycosis (PCM), the most common systemic mycosis in Latin America. PCM treatment involves a long-term chemotherapeutic approach and relapses occur at an alarming frequency. Moreover, the emergence of strains with increased drug-resistance phenotypes puts constant pressure on the necessity to develop new alternatives to treat systemic mycoses. In this work, we show that the phenothiazine (PTZ) derivative thioridazine (TR) inhibits in vitro growth of P. brasiliensis yeasts at micromolar concentrations. We employed microarray hybridization to examine how TR affects gene expression in this fungus, identifying ~1800 genes that were modulated in response to this drug. Dataset evaluation showed that TR inhibits the expression of genes that control the onset of the cell wall integrity (CWI) response, hampering production of all major structural polysaccharides of the fungal cell wall (chitin, α-glucan and β-glucan). Although TR and other PTZs have been shown to display antimicrobial activity by various mechanisms, inhibition of CWI signaling has not yet been reported for these drugs. Thus, TR may provide a novel approach to treat fungal infections by targeting cell wall biogenesis.
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This work was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo—FAPESP [Grant numbers #09/50114-7, #09/50115-3, #06/0995-9, #12/12247-8]; and Fundação de Amparo ao Ensino e à Pesquisa. Some of the authors were also supported by scholarship grants from the following Brazilian agencies: CAPES (ACO, DLJ, VCA, DLSR and FBM), CNPq (DAB and ROVB) and FAPESP (DSS).
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Daniela Leite Jabes and Ana Claudia de Freitas Oliveira contributed equally to this work.
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Jabes, D.L., de Freitas Oliveira, A.C., Alencar, V.C. et al. Thioridazine inhibits gene expression control of the cell wall signaling pathway (CWI) in the human pathogenic fungus Paracoccidioides brasiliensis . Mol Genet Genomics 291, 1347–1362 (2016). https://doi.org/10.1007/s00438-016-1184-1
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DOI: https://doi.org/10.1007/s00438-016-1184-1