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Human renal glomerular epithelial cells possess membrane urokinase receptors. Addition of purified active urokinase to these cells in serum free minimum medium induced a dose-dependent increase in 3H-thymidine incorporation and a doubling of cell number after 48 hours of incubation. Both receptor occupancy and enzymatic activity of u-PA were required to stimulate cell proliferation. This effect was inhibited by down regulation of protein kinase C (PKC) or by H7, an inhibitor of PKC. It involved a pertussis toxin-sensitive pathway. This effect of urokinase was additive with EGF but not with thrombin growth factor activity and was not inhibited by aprotinin, an inhibitor of plasmin.
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