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Cell and Tumor Biology |
Departments of 1 Cancer Research, 2 Structural Biology, and 3 Molecular Biology, Abbott Laboratories, Abbott Park, Illinois
Requests for reprints: Don Davidson, Department of Cancer Research, Abbott Laboratories, Department 48R, Building AP9, 100 Abbott Park Road, Abbott Park, IL 60064. Phone: 847-937-8547; Fax: 847-937-4150; E-mail: don.j.davidson{at}abbott.com.
Kringle 5 (K5) of human plasminogen has been shown to inhibit angiogenesis by inducing the apoptosis of proliferating endothelial cells. Peptide regions around the lysine-binding pocket of K5 largely mediate these effects, particularly the peptide PRKLYDY, which we show to compete with K5 for the binding to endothelial cells. The cell surface binding site for K5 that mediates these effects has not been defined previously. Here, we report that glucose-regulated protein 78, exposed on cell surfaces of proliferating endothelial cells as well as on stressed tumor cells, plays a key role in the antiangiogenic and antitumor activity of K5. We also report that recombinant K5-induced apoptosis of stressed HT1080 fibrosarcoma cells involves enhanced activity of caspase-7, consistent with the disruption of glucose-regulated protein 78-procaspase-7 complexes. These results establish recombinant K5 as an inhibitor of a stress response pathway, which leads to both endothelial and tumor cell apoptosis.
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