title: [A suppressive effect of PSK, a protein-bound polysaccharide preparation, on tumor growth: a new effect of PSK on cell motility].
abstract: We found that PSK has ambidextrous effects on cell motility. PSK enhances macrophage motility and inhibits tumor cell motility, when the capillary tube method was used in vitro. Macrophage motility was enhanced with increasing concentration of PSK. PSK inhibited tumor cell motility, i.e. Ehrlich tumor cells, EL-4 lymphoma cells and human leukemic cells, in dose dependent fashion. Macrophages and tumor cells were incubated with medium containing PSK for varying times at 37 degrees C and then washed with medium to eliminate PSK thoroughly. The motility of macrophages and tumor cells was enhanced and inhibited, respectively, with increasing pre-incubation time. When PSK-treated tumor cells were injected into the abdominal wall of C57BL/6 mice, PSK-treated tumor cells were less invasive than non-treated ones in mice. These phenomena are concern neither with the change of cellular viability nor that of cell proliferation.
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000818:Animals; D002286:Carcinoma, Ehrlich Tumor / Q000473:pathology*; D002464:Cell Migration Inhibition; D002465:Cell Movement; D007942:Leukemia, Experimental / Q000473:pathology*; D008223:Lymphoma / Q000473:pathology*; D008264:Macrophages / Q000276:immunology / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D011509:Proteoglycans / Q000494:pharmacology*
chemical_list: D000276:Adjuvants, Immunologic; D011509:Proteoglycans; C010770:polysaccharide-K