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J. Biol. Chem., Vol. 263, Issue 10, 4516-4519, 04, 1988
TJ Kunicki, DJ Nugent, SJ Staats, RP Orchekowski, EA Wayner and WG Carter
Blood Center of Southeastern Wisconsin, Milwaukee 53233.
A monoclonal antibody, P1H5, to the human fibroblast class II extracellular matrix receptor (ECMR II) specifically inhibits human fibroblast adhesion to collagen and immunoprecipitates a cell surface receptor containing an alpha and beta subunit of approximately 140 kilodaltons each (Wayner, E. A., and Carter, W. G. (1987) J. Cell Biol. 105, 1873-1884). We report here that P1H5 also specifically inhibits adhesion of unactivated human platelets to type I and III collagens, but not to fibronectin. Immunoprecipitation of the class II ECMR from Triton X-100 detergent lysates of platelets, after cell surface iodination, identified the platelet collagen receptor. Peptide mapping confirmed that the II alpha and II beta subunits immunoprecipitated from platelets are structurally homologous with those derived from fibroblasts. The platelet ECMR II alpha and -beta subunits comigrate with platelet membrane glycoproteins Ia and IIa, respectively, on two- dimensional nonreduced-reduced sodium dodecyl sulfate-polyacrylamide gel electrophoresis gels. These results indicate that platelet and fibroblast adhesion to collagen are both mediated by a similar receptor and that the alpha and beta subunits of this receptor are identical to platelet membrane glycoproteins Ia and IIa, respectively. Although glycoprotein Ia has been previously implicated as a collagen binding protein, our results are the first direct evidence that platelet glycoprotein Ia is associated with glycoprotein IIa in a heterodimer complex and that this complex, by mediating platelet attachment, is an actual receptor for platelet adhesion to collagen.
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