Abstract
Plasminogen activator activity was demonstrated in two carcinoma cell lines: A549 cells derived from a human alveolar epithelial carcinoma; and ZHC cells derived from a rat hepotoma. Beoth cells had intracellular plasminogen activator activity throughout their cell cycles and in each case this activity reached a maxumum. For A549 cells the maximal activity took place either during the G2 phase or in the course of the S to G2 transition, suggesting that plasminogen activator might play a role in cell division. For ZHC cells, the maximal activity occurred at the start of the S phase, suggesting that in these cells plasminogen activator might be involved in DNA replication.
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