期刊
FEMS MICROBIOLOGY LETTERS
卷 244, 期 2, 页码 297-304出版社
WILEY-BLACKWELL
DOI: 10.1016/j.femsle.2005.01.055
关键词
N-acylhomoserine lactone; Burkholderia cepacia; Pseudomonas aeruginosa; quorum sensing; cystic fibrosis
类别
Pseudomonas aeruginosa and species of the Burkholderia cepacia complex are the primary bacterial pathogens contributing to lung disease in patients with cystic fibrosis. Quorum sensing systems using N-acyl homoserine lactone (AHL) signal molecules are involved in the regulation of a number of virulence factors in these species. Extracts of mucopurulent respiratory secretions from 13 cystic fibrosis patients infected with P. aeruginosa and/or strains of the B. cepacia complex were fractionated using reverse-phase fast pressure liquid chromatography and analyzed for the presence of AHLs using a traI-luxCDABE-based reporter that responds to AHLs with acyl chains ranging between 4 and 12 carbons. Using this assay system, a broad range of AHLs were detected and identified despite being present at low concentrations in limited sample volumes. N-(3-oxo-dodecanoyl)-L-homoserine lactone, N-(3oxo-decanoyl)-L-homoserine lactone and N-octanoyl-L-homoserine lactone (OHL) were the AHLs most frequently identified. OHL and N-decanoyl-L-homoserine lactone were detected in nanomolar concentrations compared to picomolar amounts of the 3-oxo-derivatives of the AHLs identified. (c) 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.
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