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alpha IIb beta 3 redistribution triggered by receptor cross-linking

S R Simmons1, P A Sims, R M Albrecht

  • 1Department of Animal Health and Biomedical Sciences, University of Wisconsin, Madison 53706, USA.

Arteriosclerosis, Thrombosis, and Vascular Biology
|December 31, 1997
PubMed
Summary
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Platelet receptor cross-linking, not just ligand binding, initiates fibrinogen redistribution. This movement of fibrinogen/integrin complexes is crucial for platelet function.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Platelets play a critical role in hemostasis and thrombosis.
  • Integrin alpha IIb beta 3 is a key receptor involved in platelet aggregation.
  • Fibrinogen binding to alpha IIb beta 3 triggers important cellular responses.

Purpose of the Study:

  • To investigate the mechanisms initiating fibrinogen/integrin redistribution on platelets.
  • To differentiate the roles of ligand occupancy versus receptor cross-linking in triggering this movement.

Main Methods:

  • Utilized gold-conjugated fibrinogen and monoclonal antibodies targeting alpha IIb beta 3.
  • Employed monovalent fibrinogen fragments (RGDS, HHLGGAKQAGDV) to assess ligand binding.
  • Investigated receptor cross-linking using polyclonal anti-mouse IgG and antibody conjugation to gold particles.

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Main Results:

  • Monovalent fibrinogen fragments did not induce receptor redistribution.
  • Binding of monoclonal antibodies alone did not trigger movement.
  • Cross-linking of bound antibodies or fibrinogen initiated redistribution, mimicking fibrinogen's effect.

Conclusions:

  • Receptor cross-linking, rather than simple ligand occupancy, is the primary signal for fibrinogen/alpha IIb beta 3 complex redistribution.
  • This finding clarifies the initial events in integrin-mediated platelet responses.