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  • Title: Treatment of mouse L-cells with phorbol myristate acetate induces the secretion of a plasminogen activator inhibitor which binds to human and mouse urokinase and human tissue plasminogen activator.
    Author: Rehemtulla A, Gates J, Hart DA.
    Journal: Comp Biochem Physiol B; 1987; 88(1):277-83. PubMed ID: 3119281.
    Abstract:
    1. Serum-free conditioned medium from L-cells or L-cells treated with the tumor-promotor phorbol myristate acetate (PMA) was analyzed for plasminogen activator (PA) and plasminogen activator inhibitor (PAI) activity. Conditioned medium from control or PMA-treated cells did not contain detectable PA activity when assayed by SDS-PAGE and zymography. 2. Conditioned medium from PMA-treated cells, but not control cells, contained a PAI of Mr = 40,000 da when assayed by reverse zymography. 3. The L-cell PAI formed SDS-stable complexes with purified human (homo sapiens) urokinase and tissue plasminogen activator, as well as, mouse (Mus musculus) urinary PA. 4. These results indicate that biochemical and immunological differences between human and mouse urokinase and human urokinase and human tissue plasminogen activator do not influence the interaction of the L-cell PAI with these enzymes.
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