Thromb Haemost 1998; 79(01): 186-194
DOI: 10.1055/s-0037-1614248
Review Article
Schattauer GmbH

Expression of Thrombospondin 1 on the Surface of Activated Platelets Mediates their Interaction with the Heavy Chains of Human Kininogens through Lys 244-Pro 254

Authors

  • Raul A. DeLa Cadena

    1   From the Sol Sherry Thrombosis Research Center, Philadelphia, USA
    2   From the Department of Pathology and Laboratory Medicine, Philadelphia, USA
  • Satya P. Kunapuli

    1   From the Sol Sherry Thrombosis Research Center, Philadelphia, USA
    4   From the Department of Physiology, Temple University School of Medicine, Philadelphia, USA
  • Daniel A. Walz

    5   From the Department of Physiology, Wayne State University School of Medicine, Detroit, USA
  • Robert W. Colman

    1   From the Sol Sherry Thrombosis Research Center, Philadelphia, USA
    3   From the Department of Medicine, Philadelphia, USA
    4   From the Department of Physiology, Temple University School of Medicine, Philadelphia, USA
Weitere Informationen

Publikationsverlauf

Received 26. Februar 1997

Accepted after resubmission 03. September 1997

Publikationsdatum:
08. Dezember 2017 (online)

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Summary

Platelet thrombospondin (TSP1) forms a complex with high (HK) and low (LK) molecular weight kininogens. We isolated a proteolytic fragment from HK and LK heavy chains (12 kDa) recognized by TSP1 with a N-terminal sequence, K244ICVGCPRDIP254. Lys244-Pro254 oxidized to cyclic form prevented binding of 125I-LK to TSP1. This effect was abolished by reduction and alkylation. Oxidized peptide KICVGCPRDIP (100 μM) reversed the known inhibitory effects of LK or HK (1 μM), on thrombin-induced platelet activation, suggesting this peptide forms part of the cell binding site on HK and LK for activated platelets. KICVGCPRDIP completely inhibited the binding of 125I-LK to activated platelets. However, the peptide only partially inhibited binding of 125I-HK to platelets, suggesting an additional binding site on the HK light chain. Fluorescein-labeled KICVGCPRDIP bound directly and specifically to activated platelets. A monoclonal antibody directed to TSP1 partially inhibited the binding of 125I-HK to activated but not inactivated platelets. We conclude residues Lys244-Pro254 on kininogen heavy chain is responsible for binding to thrombospondin on the surface of activated platelets.