Abstract
The antimycotic activity of fatty acids has long been known, and their presence in human skin and sweat appears to protect the host against superficial mycoses. Undecanoic acid is a medium-chain fatty acid that has been used in the treatment of dermatophytoses in humans. In this study, we selected one Trichophyton rubrum undecanoic acid-resistant strain that showed a marked reduction in its capacity to grow on human nail fragments, which correlated with the reduced activity of secreted keratinolytic proteases. Moreover, the susceptibility of T. rubrum to undecanoic acid is also dependent on the carbon source utilized by both control and resistant strains. The growth of the control strain was strongly inhibited by undecanoic acid in Sabouraud medium or in cultures supplemented with low-fat milk, whereas it was ineffective when the cultures were supplemented with Tween 20 or keratin as the carbon source, suggesting that nutrient conditions are crucial in establishing a susceptibility to antifungal drugs, which is helpful for the isolation and characterization of resistant strains, and in the screening for new antifungal drugs.
References
Ammendola S, Lembo A, Battistoni A, Tagliatesta P, Ghisalberti C, Desideri A (2009) 10-undecanhydroxamic acid, a hydroxamate derivative of the undecanoic acid, has strong antimicrobial activity through a mechanism that limits iron availability. FEMS Microbiol Lett 294:61–67
Apodaca G, Mckerrow JH (1990) Expression of proteolytic activity by cultures of Trichophyton rubrum. J Med Vet Mycol 28:159–171
Baldo A, Tabart J, Vermout S, Mathy A, Collard A, Losson B, Mignon B (2008) Secreted subtilisins of Microsporum canis are involved in adherence of arthroconidia to feline corneocytes. J Med Microbiol 57:1152–1156
Brito-Madurro AG, Cuadros-Orellana S, Madurro JM, Martinez-Rossi NM, Rossi A (2005) Effect of undecanoic acid on the production of esterases and lipases by Aspergillus nidulans. Ann Microbiol 55:291–294
Brito-Madurro AG, Prade RA, Madurro JM, Santos MA, Peres NTA, Cursino-Santos JR, Martinez-Rossi NM, Rossi A (2008) A single amino acid substitution in one of the lipases of Aspergillus nidulans confers resistance to the antimycotic drug undecanoic acid. Biochem Genet 46:557–565
Cuadros SC, Martinez-Rossi NM, Rossi A (1999) Identification and linkage mapping of the phsA gene of Aspergillus nidulans, where mutation affects growth and pigmentation of colonies in a temperature- and pH-dependent way. FEMS Microbiol Lett 171:103–106
Das SK, Banerjee AB (1982a) Effect of undecanoic acid on phospholipid metabolism in Trichophyton rubrum. Sabouraudia 20:267–272
Das SK, Banerjee AB (1982b) Effect of undecanoic acid on the production of exocellular lipolytic and keratinolytic enzymes by undecanoic acid-sensitive and -resistant strains of Trichophyton rubrum. Sabouraudia 20:179–184
Ferreira-Nozawa MS, Silveira HCS, Ono CJ, Fachin AL, Rossi A, Martinez-Rossi NM (2006) The pH signaling transcription factor PacC mediates the growth of Trichophyton rubrum on human nail in vitro. Medical Mycology 44:641–645
Garg AP, Muller J (1993) Fungitoxicity of fatty acids against dermatophytes. Mycoses 36:51–63
Kumamoto CA (2008) Molecular mechanisms of mechanosensing and their roles in fungal contact sensing. Nat Rev Microbiol 6:667–673
Maranhão FCA, Paião FG, Martinez-Rossi NM (2007) Isolation of transcripts over-expressed in human pathogen Trichophyton rubrum during growth in keratin. Microb Pathog 43:166–172
Martinez-Rossi NM, Peres NTA, Rossi A (2008) Antifungal resistance mechanisms in dermatophytes. Mycopathologia 166:369–383
Monod M (2008) Secreted proteases from dermatophytes. Mycopathologia 166:285–294
Paião FG, Segato F, Cursino-Santos JR, Peres NTA, Martinez-Rossi NM (2007) Analysis of Trichophyton rubrum gene expression in response to cytotoxic drugs. FEMS Microbiol Lett 271:180–186
Peres NTA, Sanches PR, Falcão JP, Silveira HCS, Paião FG, Maranhão FCA, Gras DE, Segato F, Cazzaniga RA, Mazucato M, Cursino-Santos JR, Aquino-Ferreira R, Rossi A, Martinez-Rossi NM (2010) Transcriptional profiling reveals the expression of novel genes in response to various stimuli in the human dermatophyte Trichophyton rubrum. BMC Microbiol 10:39
Silveira HCS, Gras DE, Cazzaniga RA, Sanches PR, Rossi A, Martinez-Rossi NM (2010) Transcriptional profiling reveals genes in the human pathogen Trichophyton rubrum that are expressed in response to pH signaling. Microb Pathog 48:91–96
Tsuboi R, Ko I, Takamori K, Ogawa H (1989) Isolation of a keratinolytic proteinase from Trichophyton mentagrophytes with enzymatic activity at acidic pH. Infect Immun 57:3479–3483
Acknowledgments
This study was supported by grants from the Brazilian funding agencies Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and Fundação de Apoio ao Ensino, Pesquisa e Assistência do Hospital das Clínicas de Ribeirão Preto (FAEPA). We thank M. Mazucato for technical assistance.
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Peres, N.T.A., Cursino-Santos, J.R., Rossi, A. et al. In vitro susceptibility to antimycotic drug undecanoic acid, a medium-chain fatty acid, is nutrient-dependent in the dermatophyte Trichophyton rubrum . World J Microbiol Biotechnol 27, 1719–1723 (2011). https://doi.org/10.1007/s11274-010-0613-2
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DOI: https://doi.org/10.1007/s11274-010-0613-2