トチノキ(Aesculus turbinata BLUME)種皮ポリフェノールによるHelicobacter pyloriの胃癌細胞株MKN 45への接着抑制作用

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Polyphenolic compounds have been shown to have growth inhibitory action on Helicobacter pylori (H. pylori). Previously, we demonstrated that seed shells of the Japanese horse chestnut (Aesculus turbinata BLUME) are rich in polymerized polyphenol compounds. In this study, we have examined the effects of polyphenolic compounds from the seed shells of the Japanese horse chestnut on adherence of H. pylori to MKN 45 cells, a human stomach cancer cell line. Polyphenolic compounds, which are composed of monomeric forms of (+)-catechin and (-)-epicatechin and polymeric proanthocyanidins, reportedly inhibited the colony formation of H. pylori on agar plates (minimal inhibitory concentration: 180μg/ml). Interestingly, the polyphenolic compounds also inhibited adherence of H. pylori to MKN 45 cells at concentrations that showed no growth inhibitory action on H. pylori. When the polyphenolic compounds were further fractionated by gel filtration chromatography depending on the degrees of polymerization, fractions including polymeric proanthocyanidins exhibited higher inhibitory effects compared with a fraction containing lower-molecular weight compounds. MKN 45 cells reportedly produced IL-8 spontaneously, and IL-8 production was increased by H. pylori infection. We found that polymeric proanthocyanidins significantly and dose-dependently reduced the H. pylori-induced IL-8 production as well as the spontaneous IL-8 production. Our results raise the possibility that polymeric proanthocyanidins contained in the seed shells of the Japanese horse chestnut may prevent infection and inflammatory responses by H. pylori.
2011-02-20

トチノキ(Aesculus turbinata BLUME)種皮ポリフェノールによるHelicobacter pyloriの胃癌細胞株MKN 45への接着抑制作用

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