Potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism
Abstract Lethal systemic fungal infections of Candida species are increasingly common, especially in immune compromised patients. By in vitro screening of small molecule mimics of naturally occurring host defense peptides (HDP), we have identified several active antifungal molecules, which also exhi...
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Nature Portfolio
2017
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oai:doaj.org-article:639646d14ae24c37b3def738170a856b2021-12-02T16:08:11ZPotent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism10.1038/s41598-017-04462-62045-2322https://doaj.org/article/639646d14ae24c37b3def738170a856b2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04462-6https://doaj.org/toc/2045-2322Abstract Lethal systemic fungal infections of Candida species are increasingly common, especially in immune compromised patients. By in vitro screening of small molecule mimics of naturally occurring host defense peptides (HDP), we have identified several active antifungal molecules, which also exhibited potent activity in two mouse models of oral candidiasis. Here we show that one such compound, C4, exhibits a mechanism of action that is similar to the parent HDP upon which it was designed. Specifically, its initial interaction with the anionic microbial membrane is electrostatic, as its fungicidal activity is inhibited by cations. We observed rapid membrane permeabilization to propidium iodide and ATP efflux in response to C4. Unlike the antifungal peptide histatin 5, it did not require energy-dependent transport across the membrane. Rapid membrane disruption was observed by both fluorescence and electron microscopy. The compound was highly active in vitro against numerous fluconazole-resistant clinical isolates of C. albicans and non-albicans species, and it exhibited potent, dose-dependent activity in a mouse model of invasive candidiasis, reducing kidney burden by three logs after 24 hours, and preventing mortality for up to 17 days. Together the results support the development of this class of antifungal drug to treat invasive candidiasis.Lorenzo P. MenzelHossain Mobaswar ChowdhuryJorge Adrian Masso-SilvaWilliam RuddickKlaudia FalkovskyRafael VoronaAndrew MalsbaryKartikeya CherabuddiLisa K. RyanKristina M. DiFrancoDavid C. BriceMichael J. CostanzoDamian WeaverKatie B. FreemanRichard W. ScottGill DiamondNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017) |
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Medicine R Science Q Lorenzo P. Menzel Hossain Mobaswar Chowdhury Jorge Adrian Masso-Silva William Ruddick Klaudia Falkovsky Rafael Vorona Andrew Malsbary Kartikeya Cherabuddi Lisa K. Ryan Kristina M. DiFranco David C. Brice Michael J. Costanzo Damian Weaver Katie B. Freeman Richard W. Scott Gill Diamond Potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism |
| description |
Abstract Lethal systemic fungal infections of Candida species are increasingly common, especially in immune compromised patients. By in vitro screening of small molecule mimics of naturally occurring host defense peptides (HDP), we have identified several active antifungal molecules, which also exhibited potent activity in two mouse models of oral candidiasis. Here we show that one such compound, C4, exhibits a mechanism of action that is similar to the parent HDP upon which it was designed. Specifically, its initial interaction with the anionic microbial membrane is electrostatic, as its fungicidal activity is inhibited by cations. We observed rapid membrane permeabilization to propidium iodide and ATP efflux in response to C4. Unlike the antifungal peptide histatin 5, it did not require energy-dependent transport across the membrane. Rapid membrane disruption was observed by both fluorescence and electron microscopy. The compound was highly active in vitro against numerous fluconazole-resistant clinical isolates of C. albicans and non-albicans species, and it exhibited potent, dose-dependent activity in a mouse model of invasive candidiasis, reducing kidney burden by three logs after 24 hours, and preventing mortality for up to 17 days. Together the results support the development of this class of antifungal drug to treat invasive candidiasis. |
| format |
article |
| author |
Lorenzo P. Menzel Hossain Mobaswar Chowdhury Jorge Adrian Masso-Silva William Ruddick Klaudia Falkovsky Rafael Vorona Andrew Malsbary Kartikeya Cherabuddi Lisa K. Ryan Kristina M. DiFranco David C. Brice Michael J. Costanzo Damian Weaver Katie B. Freeman Richard W. Scott Gill Diamond |
| author_facet |
Lorenzo P. Menzel Hossain Mobaswar Chowdhury Jorge Adrian Masso-Silva William Ruddick Klaudia Falkovsky Rafael Vorona Andrew Malsbary Kartikeya Cherabuddi Lisa K. Ryan Kristina M. DiFranco David C. Brice Michael J. Costanzo Damian Weaver Katie B. Freeman Richard W. Scott Gill Diamond |
| author_sort |
Lorenzo P. Menzel |
| title |
Potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism |
| title_short |
Potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism |
| title_full |
Potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism |
| title_fullStr |
Potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism |
| title_full_unstemmed |
Potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism |
| title_sort |
potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism |
| publisher |
Nature Portfolio |
| publishDate |
2017 |
| url |
https://doaj.org/article/639646d14ae24c37b3def738170a856b |
| work_keys_str_mv |
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