title: Enhancement of lung-colonizing ability of cloned low-metastatic Lewis lung carcinoma cells by treatment with highly polar compounds.
abstract: Treatment of low-metastatic Lewis lung carcinoma cells (P-29) with dimethylsulfoxide (DMSO) in vitro enhanced their lung-colonizing ability. The effects of other highly polar compounds on the lung-colonizing ability of P-29 cells were examined. The following compounds were found to enhance the lung-colonizing ability of the cells: acetamide, N-methylacetamide, N-methylformamide, N,N-dimethylformamide, piperidone and hexamethylphosphoric triamide. Treatment of P-29 cells with DMSO or other polar compounds resulted in increases in activities of degradative enzymes, such as cathepsin B and plasminogen activator. The increases in cathepsin B and plasminogen activator activities were apparent after a 24 h treatment with DMSO and were suppressed by simultaneous treatment with cycloheximide, which suggested that they were due to syntheses of new proteins. DMSO-treated P-29 cells degraded [3H]leucine-labelled subendothelial matrix much more than did untreated cells. P-29 cells treated with DMSO or other polar compounds became attached to culture dishes more rapidly and were more resistant to detachment by trypsin treatment than untreated cells. A significant correlation was found between the degrees of adhesiveness of P-29 cells treated with various polar compounds and their lung-colonizing abilities.
mesh_terms: D000818:Animals; D002277:Carcinoma / Q000473:pathology*; D002403:Cathepsins / Q000378:metabolism; D002448:Cell Adhesion / Q000187:drug effects; D003513:Cycloheximide / Q000494:pharmacology; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D008175:Lung Neoplasms / Q000556:secondary*; D051379:Mice; D008810:Mice, Inbred C57BL; D009362:Neoplasm Metastasis; D010960:Plasminogen Activators / Q000378:metabolism; D013329:Structure-Activity Relationship; D014357:Trypsin
chemical_list: D003513:Cycloheximide; D002403:Cathepsins; D010960:Plasminogen Activators; D014357:Trypsin; D004121:Dimethyl Sulfoxide