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Lasers in Medical Science

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01.04.2016 | Original Article

Photodynamic inactivation of Klebsiella pneumoniae biofilms and planktonic cells by 5-aminolevulinic acid and 5-aminolevulinic acid methyl ester

verfasst von: Chengcheng Liu, Yingli Zhou, Li Wang, Lei Han, Jin’e Lei, Hafiz Muhammad Ishaq, Sean P. Nair, Jiru Xu

Erschienen in: Lasers in Medical Science | Ausgabe 3/2016

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Abstract

The treatment of Klebsiella pneumoniae, particularly extended-spectrum β-lactamase (ESBL)-producing K. pneumoniae, is currently a great challenge. Photodynamic antimicrobial chemotherapy is a promising approach for killing antibiotic-resistant bacteria. The aim of this study was to evaluate the capacity of 5-aminolevulinic acid (5-ALA) and its derivative 5-ALA methyl ester (MAL) in the presence of white light to cause photodynamic inactivation (PDI) of K. pneumoniae planktonic and biofilm cells. In the presence of white light, 5-ALA and MAL inactivated planktonic cells in a concentration-dependent manner. Biofilms were also sensitive to 5-ALA and MAL-mediated PDI. The mechanisms by which 5-ALA and MAL caused PDI of ESBL-producing K. pneumonia were also investigated. Exposure of K. pneumonia to light in the presence of either 5-ALA or MAL induced cleavage of genomic DNA and the rapid release of intracellular biopolymers. Intensely denatured cytoplasmic contents and aggregated ribosomes were also detected by transmission electron microscopy. Scanning electron microscopy showed that PDI of biofilms caused aggregated bacteria to detach and that the bacterial cell envelope was damaged. This study provides insights into 5-ALA and MAL-mediated PDI of ESBL-producing K. pneumoniae.

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Titel: Photodynamic inactivation of Klebsiella pneumoniae biofilms and planktonic cells by 5-aminolevulinic acid and 5-aminolevulinic acid methyl ester
verfasst von: Chengcheng Liu
Yingli Zhou
Li Wang
Lei Han
Jin’e Lei
Hafiz Muhammad Ishaq
Sean P. Nair
Jiru Xu
Publikationsdatum: 01.04.2016
Verlag: Springer London
Erschienen in: Lasers in Medical Science / Ausgabe 3/2016
Print ISSN: 0268-8921
Elektronische ISSN: 1435-604X
DOI: https://doi.org/10.1007/s10103-016-1891-1

Springer Medizin

Abstract

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