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[Platelet aggregations and glycoproteins].

N Yamamoto1, M Arai, K Tanoue

  • 1Department of Cardiovascular Research, Tokyo Metropolitan Institute of Medical Science.

Rinsho Byori. the Japanese Journal of Clinical Pathology
|March 1, 1992
PubMed
Summary

Platelet membrane glycoprotein deficiencies impact aggregation. Monoclonal antibodies TM83 and TM60 target GPIIb/IIIa and GPIb, inhibiting platelet function and revealing key roles in aggregation.

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Area of Science:

  • Hematology
  • Molecular Biology
  • Immunology

Context:

  • Platelet membrane glycoproteins are crucial for hemostasis and thrombosis.
  • Deficiencies in glycoproteins like GPIIb/IIIa, GPIb, and GPIV lead to distinct bleeding disorders such as Glanzmann's thrombasthenia and Bernard-Soulier syndrome.

Purpose:

  • To investigate the roles of GPIIb/IIIa, GPIb, and GPIV in platelet aggregation.
  • To characterize the genetic basis of Bernard-Soulier syndrome.
  • To develop and evaluate novel monoclonal antibodies for targeting platelet glycoproteins.

Summary:

  • Examined platelet aggregation in Glanzmann's thrombasthenia, Bernard-Soulier syndrome, and GPIV-deficient platelets.
  • Identified a double heterozygote inheritance pattern for GPIb abnormality in Bernard-Soulier syndrome.
  • Demonstrated negligible role of GPIV in platelet aggregation.
  • Developed monoclonal antibodies TM83 (anti-GPIIIa) and TM60 (anti-GPIb) that inhibit GPIIb/IIIa complex and GPIb function, respectively.
  • Showed TM83 targets a Ca2+-sensitive epitope on GPIIIa/GPIIb/IIIa essential for fibrinogen binding.

Impact:

  • Provides insights into the specific functions of key platelet glycoproteins in aggregation.
  • Characterizes the genetic etiology of Bernard-Soulier syndrome.
  • Highlights the potential of TM83 and TM60 antibodies as research tools and potential therapeutic agents for modulating platelet function.

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