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http://dx.doi.org/10.9799/ksfan.2012.25.4.941

Immuno-stimulating Activities of Polysaccharide Fractions Isolated from Persimmon Leaves  

Shin, Young-A (Dept. of Alternative Medicine, Graduate School, Kyonggi University)
Park, Hye-Ryung (Dept. of Food Science and Biotechnology, Kyonggi University)
Hong, Hee-Do (Korea Food Research Institute)
Shin, Kwang-Soon (Dept. of Food Science and Biotechnology, Kyonggi University)
Publication Information
The Korean Journal of Food And Nutrition / v.25, no.4, 2012 , pp. 941-950 More about this Journal
Abstract
In order to develop new physiologically active polysaccharides from persimmon leaves, two different crude polysaccharides were prepared using hot water (PLW-0) and pectinase digestion (PLE-0) and their immuno-stimulating activities were estimated. PLW-0 and PLE-0 showed similar sugar compositions with 15 different sugars, including rarely observed sugars in general polysaccharides 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, but the uronic acid content of PLE-0 was lower than that of PLW-0 caused by pectinase treatment. Both PLW-0 and PLE-0 showed potent anti-complementary activity in a dose-dependent manner which was similar to a known immuno-stimulating polysaccharide, PSK, from Coriolus versicolor. The activity of PLE-0 at a low concentration ($100{\mu}g/m{\ell}$) was higher than that of PLW-0. In an in vitro cytotoxicity analysis, PLW-0 and PLE-0 (up to $1,000{\mu}g/m{\ell}$) did not affect the growth of peritoneal macrophages and Colon 26-M3.1 carcinoma cells. In contrast, they enhanced lymphocyte proliferation activity. Peritoneal macrophages stimulated with PLW-0 and PLE-0 produced various cytokines, such as IL-6 and IL-12. However, PLE-0 was more effective on the cytokine production. Intravenous administration of PLW-0 and PLE-0 significantly augmented natural killer (NK) cell cytotoxicity against Yac-1 tumor cells 3 days after the treatment of polysaccharide fractions. But NK cells obtained from the PLE-treated group showed higher tumoricidal activity even at a low dose of $40{\mu}g$/mouse. In experimental lung metastasis of Colon 26-M3.1 carcinoma cells, prophylactic administration of PLW-0 and PLE-0 significantly inhibited lung metastasis in a dose-dependent manner and PLE-0 was more effective on the inhibition of cancer metasasis. The results lead us to conclude that the pectinase-treated process is indispensable to preparing polysaccharides with higher immune-stimulating activity from persimmon leaves.
Keywords
persimmon leaves; polysaccharide; immune-stimulating activity; anti-metastatic activity;
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Times Cited By KSCI : 7  (Citation Analysis)
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