Isolation and characterization of quorum‐sensing signalling molecules in Pseudomonas aeruginosa isolates recovered from nosocomial infections

Abstract

Pseudomonas aeruginosa is one of the most common pathogens in nosocomial infections. Many studies have documented the role of quorum-sensing (QS) systems in antibiotic tolerance of P. aeruginosa. N-acyl homoserine lactones (AHLs) serve as QS signalling molecules and can be a target for modulating bacterial pathogenicity. In this study, nosocomial isolates of P. aeruginosa were characterized for the presence of different types of QS signalling molecules. AHLs were solvent extracted and quantified by determination of β-galactosidase activity using the Escherichia coli MG4 reporter strain. Further characterization was performed by analytical thin layer chromatography coupled with detection using the Agrobacterium tumefaciens A136 biosensor strain. All P. aeruginosa isolates produced AHLs, but there were differences in the quantity and nature of AHLs. We identified AHLs belonging to C4-homoserine lactone (HSL), C6-HSL, C8-HSL, C10-HSL and C12-HSL. AHL profiling of P. aeruginosa isolates showed differences in the amounts and types of AHLs, suggesting differences in the virulence factors and the potential for infection. Our results may be investigated further using animal model systems.

Microbial dormancy and prevention of healthcare-associated infections

“…При этом, учитывая недавно опубликованные данные о способности некоторых бактериальных метаболитов с функцией аларминов как индуцировать КП, так и модулировать активность клеток иммунной системы [53][54][55][56][57], представляется особенно важным интенсифицировать изучение тех взаимодействий макро-и микроорганизмов, которые приводят к генерации и сохранению КП. Ведь накопление КП в компартментах тканей организма после разрешения или временного утихания воспалительных реакций может быть основой рецидивов инфекции при реверсии КП в бактерии с высоким пролиферативным потенциалом.…”