title: Effect of cisplatin on the plasma membrane phosphatase activities in ascites sarcoma-180 cells: a cytochemical study.
abstract: To study the effects of cisplatin [cis-dichlorodiammine-platinum (II)] on tumor cells in the presence or absence of the immune system, animals with ascites sarcoma-180 tumor burden were treated with therapeutic dose levels (9 mg/kg). Similarly, ascites sarcoma-180 cells were maintained in tissue culture media containing the same levels of the drug. Cell samples were taken from the animals at 12-hr intervals for 3 days, whereas samples were drawn from the tissue cultures at 15-, 30-, 45-, and 60-min and at 2-, 3-, 4-, and 5-hr intervals. Treated and untreated cells from in vitro and in vivo experiments, when checked for alkaline phosphatase, 5'-nucleotidase, Ca2+-ATPase, and Na+-K+-ATPase, show a gradual decrease in activity on the plasma membrane. It takes about 60 min for inactivation of any enzyme in vitro, whereas it takes 2 days in in vivo experiments. Quantitative analysis show alkaline phosphatase activity drops from 9.7 to 4.9 nmol in just 15 min, and drops further to 0.79 nmol after 2 hr. Inactivation of various plasma membrane enzymes, resulting in permeability changes, is probably responsible for cell death.
mesh_terms: D015720:5'-Nucleotidase; D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D000252:Calcium-Transporting ATPases / Q000378:metabolism; D002462:Cell Membrane / Q000201:enzymology*; D002945:Cisplatin / Q000494:pharmacology*; D005260:Female; D006651:Histocytochemistry; D051379:Mice; D008815:Mice, Inbred Strains; D009708:Nucleotidases / Q000378:metabolism; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism*; D012510:Sarcoma 180 / Q000201:enzymology* / Q000648:ultrastructure; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
chemical_list: D009708:Nucleotidases; D000469:Alkaline Phosphatase; D010744:Phosphoric Monoester Hydrolases; D015720:5'-Nucleotidase; D000252:Calcium-Transporting ATPases; D000254:Sodium-Potassium-Exchanging ATPase; D002945:Cisplatin