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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2010; 38(2): 198-206

녹차 폴리페놀에 노출된 Imipenem 내성 Pseudomonas aeruginosa의 항균효과 및 세포반응

Antibacterial Effects and Cellular Responses of Imipenem-resistant Pseudomonas aeruginosa Exposed to Green Tea Polyphenols

You-Jin Song , Yun-Seok Cho and Kye-Heon Oh

Department of Biotechnology, Soonchunhyang University, 1Department of Biotechnology, Soonchunhyang University, 2Department of Biotechnology, Soonchunhyang University

Abstract

The aim of this work was to investigate the synergically bactericidal effects and cellular responses of tea polyphenols (TPP) and imipenem on imipenem-resistant Pseudomonas aeruginosa. Imipenem-resistant Ps. aeruginosa was isolated from patient in hospital. The bactericidal effects of TPP and imipenem were evaluated on the basis of its minimum inhibitory concentrations (MIC). The combined use of TPP and imipenem resulted in 16-fold and 8-fold reductions in the MICs of imipenem for the imipenem-susceptible and imipenem-resistant Ps. aeruginosa, respectively. The bactericidal effects of the imipenem and TPP against the Ps. aeruginosa was evaluated using the time-kill assay. The synergetic effects of the combinations of TPP and imipenem against Ps. aeruginosa were confirmed. Western blot using anti-DnaK and anti-GroEL monoclonal antibodies was performed to investigate the expression of stress shock proteins (SSPs) in imipenem-susceptible and imipenem-resistant strains exposed to TPP. The amount of SSPs were induced as the exposure time increased and decreased. The molecular weights of DnaK and GroEL were 70 kDa and 60 kDa, respectively. SDS-PAGE with silver staining revealed that the amount of lipopolysaccharides (LPS) increased or decreased in the strain treated to different concentrations and exposing periods of TPP. Scanning electron microscopic analysis demonstrated the presence of umblicated and wrinkled surfaces for cells treated with TPP or imipenem.

Keywords: Green tea polyphenols, imipenem, Pseudomonas aeruginosa, synergic effect

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