Abstract:
OBJECTIVE:The increasing importance of dermatophytoses and emerging resistance of dermatophytes to current synthetic antifungals have stimulated the search for safer and more effective alternative drugs from natural sources. The present study was carried out to identify antagonistic bacteria of soil origin with strong inhibitory activities on the growth of major human pathogenic dermatophytes. MATERIALS AND METHODS:Antifungal activity of isolated soil bacteria was screened against the dermatophytes from three genera Microsporum (M. canis, M. gypseum), Epidermophyton (E. floccosum) and Trichophyton (T. mentagrophytes, T. rubrum, T. violaceum, T. tonsurans) by using visual plate agar assay method. A Pseudomonas chlororaphis isolate S105, identified at the species level by 16S ribosomal RNA sequence analysis, was reported as the strongest antagonistic bacterium. P. chlororaphis S105 culture supernatant (PCCS) was examined against tested dermatophytes by GY (glucose-yeast extract) broth bioassay in 6-well microplates. Antifungal compound of the bacterium was partially purified from the culture supernatant through a purification scheme of methanol extraction, Diaion HP20 ion-exchange chromatography and preparative thin layer chromatography. RESULTS:P. chlororaphis S105 was the most potent inhibitor of fungal growth for all tested dermatophytes with a percent inhibition ranged from 57.1% to 99.8%. The PCCS suppressed the growth of all fungi tested in the range of 18.5% to 84.8%. Partially purified antifungal compound of the bacterium was identified as a phenazine-like compound with an Rf value of 0.51. The compound inhibited fungal growth by 73.6% to 97.9% on GY broth. Fungal growth inhibition was significant for all dermatophytes tested in comparison with the controls (Anova, P<0.05). CONCLUSION:With respect to the strong inhibitory activity of P. chlororaphis against pathogenic dermatophytes reported here, it may be considered as a rich source of useful metabolites with potential application in antifungal drug discovery.
journal_name
J Mycol Medjournal_title
Journal de mycologie medicaleauthors
Ranjbariyan A,Shams-Ghahfarokhi M,Razzaghi-Abyaneh Mdoi
10.1016/j.mycmed.2014.01.117subject
Has Abstractpub_date
2014-06-01 00:00:00pages
e57-64issue
2eissn
1156-5233issn
1773-0449pii
S1156-5233(14)00118-8journal_volume
24pub_type
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journal_title:Journal de mycologie medicale
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doi:10.1016/j.mycmed.2016.05.005
更新日期:2016-09-01 00:00:00
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journal_title:Journal de mycologie medicale
pub_type: 杂志文章
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journal_title:Journal de mycologie medicale
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journal_title:Journal de mycologie medicale
pub_type: 杂志文章,评审
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journal_title:Journal de mycologie medicale
pub_type: 杂志文章
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更新日期:2012-03-01 00:00:00
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journal_title:Journal de mycologie medicale
pub_type: 杂志文章,meta分析,评审
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更新日期:2017-06-01 00:00:00
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pub_type: 杂志文章
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更新日期:2019-06-01 00:00:00
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pub_type: 杂志文章
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更新日期:2012-03-01 00:00:00
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更新日期:2018-03-01 00:00:00
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pub_type: 杂志文章
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更新日期:2014-06-01 00:00:00
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journal_title:Journal de mycologie medicale
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