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Cell. 1989 Sep 8;58(5):945-53.

Recognition of distinct adhesive sites on fibrinogen by related integrins on platelets and endothelial cells.

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Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.


Endothelial cells and activated platelets express integrin-type receptors responsible for adhesion to fibrinogen. We have located distinct integrin-directed endothelial cell and platelet attachment sites on immobilized fibrinogen using a combination of synthetic peptides, fibrinogen fragments, and specific anti-peptide monoclonal antibodies. Endothelial cells exclusively recognize an Arg-Gly-Asp-containing site near the C-terminus of the alpha chain (alpha residues 572-574) but fail to recognize the Arg-Gly-Asp sequence in the N-terminal region of the same chain (alpha residues 95-97). In contrast, platelets do not require either Arg-Gly-Asp sequence for binding to intact fibrinogen and are capable of recognizing, in addition to the alpha 572-574 sequence, a site at the C-terminus of the gamma chain (gamma residues 400-411). These data suggest a molecular mechanism whereby platelets and endothelial cells interact with distinct sites on the fibrinogen molecule during hemostasis and wound healing.

[Indexed for MEDLINE]

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