title: Antimetastatic effect of PSK, a protein-bound polysaccharide, against the B16-BL6 mouse melanoma.
abstract: We examined the effect of PSK, a protein-bound polysaccharide, upon in vivo metastasis and in vitro invasion of the B16-BL6 mouse melanoma cells. (1) PSK suppressed in vivo artificial and spontaneous lung metastases of B16-BL6 in C57BL/6 mice. (2) PSK in a dose-dependent fashion suppressed in vitro invasion and chemotaxis of the tumor cells using filters coated with a reconstituted basement membrane. (3) PSK had little effect on DNA synthesis in tumor cells in vitro, but suppressed tumor cell adhesion to, degradation of, and haptotaxis to components of the basement membrane. (4) PSK suppressed the binding of tumor cells to components of the basement membrane. These findings suggest that PSK may suppress metastasis through inhibition of tumor cell invasion and that this effect is the result of interactions between PSK and components of the basement membrane.
authors.affiliation: Biomedical Research Laboratories, Kureha Chemical Industry, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Matsunaga
authors.forename: M
authors.initials: M
authors.lastname: Ohhara
authors.forename: Y
authors.initials: Y
authors.lastname: Oguchi
authors.forename: H
authors.initials: H
authors.lastname: Iijima
authors.forename: H
authors.initials: H
authors.lastname: Kobayashi
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology*; D002448:Cell Adhesion / Q000187:drug effects; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D004354:Drug Screening Assays, Antitumor / Q000379:methods; D005260:Female; D008175:Lung Neoplasms / Q000188:drug therapy / Q000556:secondary; D008546:Melanoma, Experimental / Q000188:drug therapy / Q000556:secondary; D051379:Mice; D008807:Mice, Inbred BALB C; D009362:Neoplasm Metastasis; D011509:Proteoglycans / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D000903:Antibiotics, Antineoplastic; D011509:Proteoglycans; C010770:polysaccharide-K