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Assessment of in vivo antimicrobial activity of the carbene silver(I) acetate derivative SBC3 using Galleria mellonella larvae

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Abstract

The antimicrobial drug candidate 1,3-dibenzyl-4,5-diphenyl-imidazol-2-ylidene silver(I) acetate (SBC3) was evaluated for its ability to function in vivo using larvae of Galleria mellonella. A SBC3 concentration of 25 μg/ml inhibited the growth of Staphylococcus aureus by 71.2 % and Candida albicans by 86.2 % in vitro. Larvae inoculated with 20 μl of SBC3 solution showed no ill effects up to a concentration of 250 μg/ml but administration of 500 μg/ml resulted in a 40 % reduction in larval survival and administration of a dose of 1,000 μg/ml resulted in total larval death at 24 h. Larvae inoculated with S. aureus or C. albicans and subsequently administered SBC3 showed increased survival. Administration of SBC3 to larvae did not boost the insect immune response as indicated by lack of an increase in the density of circulating haemocytes (immune cells). The abundance of a number of proteins involved in the insect immune response was reduced in larvae that received 20 μl SBC3 solution of 100 μg/ml. This is the first demonstration of the in vivo activity of SBC3 against S. aureus and C. albicans and demonstrates that SBC3 does not stimulate a non-specific immune response in larvae.

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Acknowledgments

The authors thank University College Dublin for funding for FH. NB is the recipient of a Hume Scholarship from NUI Maynooth.

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Authors and Affiliations

  1. Department of Biology, National University of Ireland Maynooth, Co Kildare, Ireland

    Niall Browne & Kevin Kavanagh

  2. UCD School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland

    Frauke Hackenberg, Wojciech Streciwilk & Matthias Tacke

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  1. Niall Browne
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  2. Frauke Hackenberg
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  3. Wojciech Streciwilk
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  4. Matthias Tacke
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  5. Kevin Kavanagh
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Correspondence to Kevin Kavanagh.

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Browne, N., Hackenberg, F., Streciwilk, W. et al. Assessment of in vivo antimicrobial activity of the carbene silver(I) acetate derivative SBC3 using Galleria mellonella larvae. Biometals 27, 745–752 (2014). https://doi.org/10.1007/s10534-014-9766-z

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  • DOI: https://doi.org/10.1007/s10534-014-9766-z

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