title: Enhancement of anti-cancer activity of cisdiaminedichloroplatinum by the protein-bound polysaccharide of Coriolus versicolor QUEL (PS-K) in vitro.
abstract: The protein-bound polysaccharide of Coriolus versicolor QUEL (PS_K) expresses superoxide dismutase (SOD) mimicking activity. Examination was made of the effects of PS-K on cancer cell lines following administration of the anti-cancer drug cisdiaminedichloroplatinum (cisplatin). Cell proliferation of each cell line was inhibited markedly by cisplatin from 0.5 to 5 micrograms/0.5 ml per well. Fifty percent of the inhibitory concentration (IC50) was 0.33 micrograms/0.5 ml per well in NRK-49F and human ovarian cancer cells, and 1.5 micrograms/0.5 ml per well in H4-II-E. PS-K 50 micrograms/0.5 ml per well prevented cytotoxicity due to cisplatin toward NRK-49F, but enhanced the cytotoxicity on H4-II-E and human ovarian cancer cells. Increase in lipid peroxide and decrease in SOD activity were observed following an IC50 dose of cisplatin. With PS-K 50 micrograms/0.5 ml per well, all the above were augmented in H4-II-E and ovarian cancer cells, but diminished in NRK-49F cell line. PS-K may have effect on cancer patients through its combining with cisplatin.
authors.affiliation: Molecular Biology Laboratory, Kitasato University School of Medicine, Kanagawa, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: K
authors.initials: K
authors.lastname: Kariya
authors.forename: K
authors.initials: K
authors.lastname: Saigenji
authors.forename: K
authors.initials: K
authors.lastname: Nakamura
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology*; D002374:Catalase / Q000378:metabolism; D002945:Cisplatin / Q000494:pharmacology*; D005979:Glutathione Peroxidase / Q000378:metabolism; D006801:Humans; D008054:Lipid Peroxides / Q000378:metabolism; D011509:Proteoglycans / Q000494:pharmacology*; D051381:Rats; D013482:Superoxide Dismutase / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D000903:Antibiotics, Antineoplastic; D008054:Lipid Peroxides; D011509:Proteoglycans; C010770:polysaccharide-K; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D002945:Cisplatin