title: Calcium stimulation of plasminogen activator secretion/production by swiss 3T3 cells.
abstract: Actively growing Swiss 3T3 cells secret high levels of plasminogen activator which decreases after the cells become confluent. In contrast, simian virus 40-transformed 3T3 cells secrete large amounts of plasminogen activator independent of cell density (Chou, I.-N., O'Donnel, S.P., Black, P.H., and Roblin, R.O. (1977) J. Cell. Physiol. 91, 31-38). These results suggest a correlation between active cell multiplication and plasminogen activator secretion in both 3T3 and simian virus-transformed 3T3 cells. The data reported herein indicate that treatment of both subconfluent and confluent Swiss 3T3 cells with high concentrations of Ca2+ (final 3.0 to 4.9 mM) increases the amounts of both secreted and cell-associated plasminogen activator in a dose-dependent manner. In addition, the ionophore A23187 (19 to 95 nM) in the presence of a normal level of Ca2+ (1.8 mM) stimulates both production and secretion of plasminogen activator from growing 3T3 cells. The Ca2+ stimulation of plasminogen activator production/secretion may be related to the mitogenic effect of Ca2+.
mesh_terms: D000001:Calcimycin / Q000494:pharmacology; D002118:Calcium / Q000494:pharmacology*; D002471:Cell Transformation, Neoplastic; D002478:Cells, Cultured; D010960:Plasminogen Activators / Q000378:metabolism*; D013539:Simian virus 40; D013268:Stimulation, Chemical
chemical_list: D000001:Calcimycin; D010960:Plasminogen Activators; D002118:Calcium