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Discrepancy between viable counts and light output as viability measurements, following ciprofloxacin challenge of self-bioluminescent Pseudomonas aeruginosa biofilms

Marques, Cl�udia N.H.; Salisbury, Vyvyan C.; Greenman, John; Bowker, Karen E.; Nelson, Shona M.

Authors

Cl�udia N.H. Marques

Vyvyan C. Salisbury

John Greenman

Karen E. Bowker

Shona M. Nelson



Abstract

Objectives: To utilize bioluminescence to follow the effect of ciprofloxacin challenge on Pseudomonas aeruginosa biofilms. Methods: The Sorbarod continuous perfusion culture system was used for the cultivation of biofilms of a self-bioluminescent strain of P. aeruginosa PAO1. Biofilms were challenged with ciprofloxacin (5 mg/L) in the perfusing medium for 3 h and allowed to recover to pre-challenge population levels before initiation of a second 3 h challenge. In addition to determining eluate and biofilm cell survival by conventional viable plate counts, light output was monitored via a luminometer and a low-light-level ICCD camera, to give an indication of metabolism. The effect of drug challenge on biofilm structure was investigated using an environmental scanning electron microscope, which allowed discernment of changes to the three-dimensional biofilm architecture. Results: On challenge with ciprofloxacin, eluate light output measurements declined to a lesser extent than viable counts for the same samples and also indicated that post-challenge recovery of the biofilm metabolism did not occur as rapidly as suggested by viable count data. Photon detection by ICCD camera allowed real-time, non-invasive imaging of metabolic activity within intact biofilms. Conclusions: The application of a bioluminescent reporter strain to biofilm research provides valuable real-time positional data on the efficacy of anti-biofilm treatment strategies. © The Author 2005. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved.

Citation

Nelson, S. M., Bowker, K. E., Greenman, J., Salisbury, V. C., & Marques, C. N. (2005). Discrepancy between viable counts and light output as viability measurements, following ciprofloxacin challenge of self-bioluminescent Pseudomonas aeruginosa biofilms. Journal of Antimicrobial Chemotherapy, 56(4), 665-671. https://doi.org/10.1093/jac/dki285

Journal Article Type Article
Publication Date Oct 1, 2005
Journal Journal of Antimicrobial Chemotherapy
Print ISSN 0305-7453
Electronic ISSN 1460-2091
Publisher Oxford University Press (OUP)
Peer Reviewed Not Peer Reviewed
Volume 56
Issue 4
Pages 665-671
DOI https://doi.org/10.1093/jac/dki285
Keywords P. aeruginosa, biofilms, bioluminescence
Public URL https://uwe-repository.worktribe.com/output/1052055
Publisher URL http://dx.doi.org/10.1093/jac/dki285


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