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題 名 | Effects of Quorum Sensing Signal Molecules on the Hydrogen Peroxide Resistance Against Planktonic Pseudomonas Aeruginosa=定額感應訊號分子對懸浮綠膿桿菌細胞過氧化氫抗性之影響 |
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作 者 | 黃慶璨; 石佩青; | 書刊名 | 微免與感染雜誌 |
卷 期 | 33:3 2000.09[民89.09] |
頁 次 | 頁154-158 |
分類號 | 414.83 |
關鍵詞 | 定額感應訊號分子; 懸浮綠膿桿菌細胞; 過氧化氫; Homoserine lactones; Hydrogen peroxide; Quorum sensing; Resistance; |
語 文 | 英文(English) |
英文摘要 | The effects of quorum sensing signal molecules in Pseudomonas aeruginosa, N-butanoyl-L-homoserinelactone (C4-HSL) and N-(3-oxododecanoyl) -L-homoserinelactone (3-oxo-C12-HSL) on planktonic cell resistance against hydrogen peroxide were studied. In P. aeruginosa JP2 cells with the deletion of lasl and rhll, the viable cell concentration decreased with time and was reduced by about 4 log after 2 h of 7.5 mM H�烙�� treatment, while only a 2-log reduction was found for the wild type P. aeruginosa PAO1 cells. When cultured with 20% PAO1 spent medium, P. aeruginosa JP2 showed similar hydrogen peroxide resistance to that seen in P. aeruginosa PAO1. Culturing with 20% JP2 spent medium or with 10 μM C4-HSL ad 20 μM 3-oxo-C12-HSL did not affect P. aeruginosa JP2 cell susceptibility to hydrogen peroxide. Although both 20% PAO1 and JP2 spent media reacted with H�烙�� and reduced H�烙�� to 50% of the strength of the original concentration, the remaining H�烙�� was still sufficient to kill P. aeruginosa JP2. These results indicate that the difference in cell resistance against H�烙 between P. aeruginosa PAO1 and JP2 was related to the existence of gene products of the lasl and rhll systems. However, adding synthetic homoserine lactones alone did not increase P. aeruginosa JP2 cell resistance to H�烙�� as seen in the experiments adding PAO1 spent medium. Determination of the detailed relation between cascade regulation in P. aeruginosa and its cell resistance to H�烙�� will require further investigation. |
本系統中英文摘要資訊取自各篇刊載內容。