Abstract
To investigate the antitumor and antimetastatic polysaccharide from the mature leaves of green tea, GTE-II was purified using size exclusion chromatography. GTE-II consisted of 15 different sugars including rarely observed sugars such as 2-O-methyl-fucose, 2-O-methyl-xylose, apiose, aceric acid, 3-deoxy-d-manno-2-octulosonic acid, and 3-deoxy-d-lyxo-2-heptulosaric acid, which were characteristics of pectic polysaccharide rhamnogalacturonan-II. Treatment of peritoneal macrophages with GTE-II not only increased interleukin (IL)-6 and IL-12 production, but also had significantly increased tumoricidal activity against Yac-1 tumor cells than those obtained from untreated mice. In an assay of natural killer (NK) cell activity, intravenous administration of GTE-II significantly stimulated NK cytotoxicity against Yac-1 tumor cells. Furthermore, the depletion of NK cells by injection of rabbit anti-asialo GM1 serum eliminated the inhibitory effect of GTE-II on B16BL6 melanoma cells. These data suggest that GTE-II inhibits tumor metastasis, and its antitumor effect is associated with activation of macrophages and NK cells.
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