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Eradicating uropathogenic Escherichia coli biofilms with a ciprofloxacin–dinitroxide conjugate

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Abstract

Urinary tract infections (UTIs) are amongst the most common and prevalent infectious diseases worldwide, with uropathogenic Escherichia coli (UPEC) reported as the main causative pathogen. Fluoroquinolone antibiotics are commonly used to treat UTIs but for infections involving UPEC biofilms, which are commonly associated with catheter use and recurrent episodes, ciprofloxacin is often ineffective. Here we report the development of a ciprofloxacin–dinitroxide (CDN) conjugate with potent UPEC biofilm-eradication activity. CDN 11 exhibited a 2-fold increase in potency over the parent antibiotic ciprofloxacin against UPEC biofilms. Moreover, CDN 11 resulted in almost complete UPEC biofilm cell eradication (99.7%) at concentrations as low as 12.5 μM, and significantly potentiated ciprofloxacin's biofilm-eradication activity against UPEC upon co-administration. The biofilm-eradication activity of CDN 11 highlights the potential of nitroxide functionalized antibiotics as a promising strategy for the treatment of biofilm-related UTIs.

Graphical abstract: Eradicating uropathogenic Escherichia coli biofilms with a ciprofloxacin–dinitroxide conjugate

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Publication details

The article was received on 01 Feb 2019, accepted on 19 Feb 2019 and first published on 25 Feb 2019


Article type: Research Article
DOI: 10.1039/C9MD00062C
Med. Chem. Commun., 2019, Advance Article

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    Eradicating uropathogenic Escherichia coli biofilms with a ciprofloxacin–dinitroxide conjugate

    A. D. Verderosa, J. Harris, R. Dhouib, M. Totsika and K. E. Fairfull-Smith, Med. Chem. Commun., 2019, Advance Article , DOI: 10.1039/C9MD00062C

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