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Structure and Function of Platelet Glycocalicin.

G A Jamieson1, T Okumura1, M Hasitz1

  • 1The American National Red Cross, Blood Research Laboratory, Bethesda, Maryland, U.S.A.

Thrombosis and Haemostasis
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Platelet glycocalicin, a glycoprotein, inhibits aggregation and binds thrombin. Its structure and function are key to understanding platelet activity and bleeding disorders.

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Area of Science:

  • Biochemistry
  • Hematology
  • Molecular Biology

Background:

  • Platelet glycocalicin is a major glycoprotein on the platelet surface.
  • It plays a role in platelet aggregation and adhesion.
  • Understanding its structure is crucial for platelet function research.

Purpose of the Study:

  • To review current knowledge on platelet glycocalicin structure and function.
  • To elucidate the role of glycocalicin in thrombin-induced platelet aggregation.
  • To investigate the relationship between glycocalicin, glycoprotein I, and thrombin binding.

Main Methods:

  • Purification of glycocalicin.
  • Assays for platelet aggregation inhibition (thrombin, ristocetin).
  • Analysis of thrombin binding activity.
  • Studies using chymotrypsin-modified platelets and Bernard-Soulier disease platelets.

Main Results:

  • Purified glycocalicin inhibits platelet aggregation induced by thrombin and ristocetin.
  • Thrombin binding activity resides in the peptide tail (45,000 Mr) of glycocalicin.
  • Glycocalicin is functionally and immunologically identical to membrane-bound glycoprotein I.
  • Thrombin binding is proportional to the amount of glycocalicin/glycoprotein I present.

Conclusions:

  • Platelet glycocalicin is a key inhibitor of platelet aggregation.
  • The peptide tail of glycocalicin contains the thrombin binding site.
  • Platelets possess a single class of binding sites for thrombin, mediated by glycocalicin/glycoprotein I.