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Determination of the spatiotemporal dependence of Pseudomonas aeruginosa biofilm viability after treatment with NLC-colistin

Authors Sans-Serramitjana E, Jorba M, Pedraz JL, Vinuesa T, Viñas M

Received 4 April 2017

Accepted for publication 6 May 2017

Published 12 June 2017 Volume 2017:12 Pages 4409—4413


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Dr Thomas Webster

Eulalia Sans-Serramitjana,1 Marta Jorba,1 José Luis Pedraz,2 Teresa Vinuesa,1 Miguel Viñas1

1Laboratory of Molecular Microbiology and Antimicrobials, Department of Pathology and Experimental Therapeutics, University of Barcelona, Barcelona, 2Laboratory of Pharmaceutics, University of the Basque Country (UPV/EHU), Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina, Vitoria, Spain

Abstract: The emergence of colistin-resistant Pseudomonas aeruginosa in cystic fibrosis (CF) patients, particularly after long-term inhalation treatments, has been recently reported. Nanoencapsulation may enable preparations to overcome the limitations of conventional pharmaceutical forms. We have determined the time-dependent viability of P. aeruginosa biofilms treated with both free and nanoencapsulated colistin. We also examined the relationship between the optimal anti-biofilm activity of nanostructured lipid carrier (NLC)-colistin and the structural organization of the biofilm itself. The results showed the more rapid killing of P. aeruginosa bacterial biofilms by NLC-colistin than by free colistin. However, the two formulations did not differ in terms of the final percentages of living and dead cells, which were higher in the inner than in the outer layers of the treated biofilms. The effective anti-biofilm activity of NLC-colistin and its faster killing effect recommend further studies of its use over free colistin in the treatment of P. aeruginosa infections in CF patients.

Keywords: cystic fibrosis, colistin sulfate, lipid nanoparticles, P. aeruginosa, confocal laser scanning microscopy, anti-biofilm activity

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