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Related Experiment Videos

Affinity modulation in platelet alpha 2 beta 1 following ligand binding

N Gofer-Dadosh1, A Klepfish, H Schmilowitz

  • 1Hemostasis Research Laboratory, Rabin Medical Center, Petah Tiqva, Israel.

Biochemical and Biophysical Research Communications
|March 27, 1997
PubMed
Summary

Platelet alpha-2 beta-1 receptors bind collagen with higher affinity after ligand binding. This interaction involves a new, intrareceptor disulfide bond, enhancing receptor-ligand interactions.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Platelet adhesion to collagen is crucial for hemostasis.
  • The alpha-2 beta-1 integrin is a key receptor mediating platelet-collagen interactions.
  • The precise mechanism of affinity modulation for alpha-2 beta-1 remains incompletely understood.

Purpose of the Study:

  • To investigate ligand-induced changes in the affinity of platelet alpha-2 beta-1 for collagen.
  • To identify the molecular mechanisms underlying enhanced alpha-2 beta-1 receptor-ligand binding.

Main Methods:

  • Labeled viable platelets were passed through fibrillar collagen columns.
  • Stringent lysis conditions were used to isolate high-affinity receptor fractions.
  • Elution with DTT and SDS, followed by Western blotting and antibody-based functional assays.

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  • Investigated elution with EDTA, chaotropic agents, low pH, DTT, and acetic acid.

    • Main Results:

    • A high-affinity fraction of alpha-2 beta-1 was eluted using DTT and SDS.
    • Antibodies against this fraction inhibited collagen-specific platelet adhesion and aggregation.
    • EDTA, chaotropic agents, or low pH did not elute the high-affinity fraction.
    • DTT followed by acetic acid successfully eluted the high-affinity fraction.

    Conclusions:

    • Ligand binding induces the formation of a new, intrareceptor disulfide bond in a fraction of alpha-2 beta-1.
    • This disulfide bond formation increases the receptor's affinity for its ligand (collagen).
    • This mechanism contributes to the functional regulation of platelet-collagen interactions.