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KMID : 0545120070170071120
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Journal of Microbiology and Biotechnology
2007 Volume.17 No. 7 p.1120 ~ p.1126
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Assessment of Lipopolysaccharide-binding Activity of Bifidobacterium and Its Relationship with Cell Surface Hydrophobicity, Autoaggregation, and Inhibition of Interleukin-8 Production
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Park Myeong-Soo
Kim Min-Jeong
Ji Geun-Eog
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Abstract
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This study was performed to screen probiotic bifidobacteria for their ability to bind and neutralize lipopolysaccharides (LPS) from Escherichia coli and to verify the relationship between LPS-binding ability, cell surface hydrophobicity (CSH), and inhibition of LPS-induced interleukin-8 (IL-8) secretion by HT-29 cells of the various bifidobacterial strains. Ninety bifidobacteria isolates from human feces were assessed for their ability to bind fluorescein isothiocyanate (FITC)-labeled LPS from E. coli. Isolates showing 30-60% binding were designated LPS-high binding (LPS-H) and those with less than 15% binding were designated LPS-low binding (LPS-L). The CSH, autoaggregation (AA), and inhibition of LPS-induced IL-8 release from HT-29 cells of the LPS-H and LPS-L groups were evaluated. Five bifidobacteria strains showed high levels of LPS binding, CSH, AA, and inhibition of IL-8 release. However, statistically significant correlations between LPS binding, CSH, AA, and reduction of IL-8 release were not found. Although we could isolate bifidobacteria with high LPS-binding ability, CSH, AA, and inhibition of IL-8 release, each characteristic should be considered as strain dependent. Bifidobacteria with high LPS binding and inhibition of IL-8 release may be good agents for preventing inflammation by neutralizing Gramnegative endotoxins and improving intestinal health
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KEYWORD
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Aggregation, bifidobacteria, cell surface hydrophobicity, interleukin-8, lipopolysaccharides
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