Suppressive Effects on Cancer Cell Proliferation of the Enhancement of Superoxide Dismutase (SOD) Activity Associated with the Protein-Bound Polysaccharide of Coriolus versicolor QUEL

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Abstract
The protein-bound polysaccharide of Coriolus versicolor QUEL (PS-K) expresses superoxide dismutase (SOD) mimicking activity. Examination was made of the suppressive effects of PS-K on cancer cell lines cultured in vitro. SOD activity of incorporated PS-K was 5.88 u/mg in LLC-WRC-256 (Walker 256 fibrosarcoma) cells and 4.73 u/mg in NRK-49F (rat normal kidney fibroblast) cells. SOD activity in both cell types was enhanced about 7-8 times that of the original PS-K. PS-K was not incorporated into H4-11-E or H4—11-E-C3 (rat hepatoma) cells. SOD activity of 1 mg/ml PS-K incubated with cell homogenates of LLC-WRC-256 cells for 6 hours increased from 0.68 u/mg to 1.35 u/mg. SOD activity of PS-K lmg/ml in 0.05 M phosphate buffer incubated with 50 μM NADPH increased from 0.68 u/mg to 1.38 u/mg. The consumption of NADPH at the same concentration was confirmed spectrophotometically by incubation with PS-K. The mechanism for the enhancement of SOD activity associated with PS-K is considered to be collaboration with NADPH as an electron donor in the cytoplasm of cancer cells whose SOD and coupling enzyme activities are significantly lower than in normal cells.

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