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- W4246163089 abstract "Cellular receptors for plasminogen and tissue plasminogen activator (t- PA) regulate plasminogen activation and cell-associated proteolytic activity. The characteristics of the interactions of both ligands with monocytes and monocytoid cell lines bear certain similarities, including affinity (kd approximately 1 mumol/L) capacity and susceptibility to carboxypeptidase treatment. Therefore, we have undertaken the present study to determine directly whether t-PA and plasminogen share common binding sites on cells. We found that recombinant human single-chain t-PA (rt-PA) could inhibit the binding of 125I-plasminogen to the cells and, conversely, plasminogen could inhibit 125I-rt-PA binding. This relationship was observed with 9 cell types, including both adherent cells and cells in suspension. In addition, under several conditions of cell treatment, plasminogen and t- PA receptor expression was modulated in parallel. Furthermore, molecules that have been implicated as candidate plasminogen receptors, gangliosides, and an alpha-enolase--related molecule, also interacted with t-PA. These results suggest that at least a component of the binding sites for plasminogen is shared with t-PA. Occupancy of these sites by either or both ligand(s) should result in arming the cells with the proteolytic activity of plasmin." @default.
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- W4246163089 date "1993-10-15" @default.
- W4246163089 modified "2023-10-18" @default.
- W4246163089 title "Competition between plasminogen and tissue plasminogen activator for cellular binding sites" @default.
- W4246163089 doi "https://doi.org/10.1182/blood.v82.8.2433.bloodjournal8282433" @default.
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