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ADAM 15 is an adhesion receptor for platelet GPIIb-IIIa and induces platelet activation

Harald Langer1, Andreas E May, Andreas Bültmann

  • 1The Medizinische Klinik III, Universitätsklinikum Tübingen, Eberhard-Karls-Universität Tübingen, Tübingen, Germany.

Thrombosis and Haemostasis
|November 5, 2005
PubMed

Insights

Metargidin (ADAM15) acts as an adhesion receptor on endothelial cells, mediating platelet adhesion and activation. This interaction promotes thrombus formation, suggesting ADAM15 as a potential target for antithrombotic therapies in cardiovascular diseases.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Cardiovascular Research

Background:

  • Atherosclerosis involves cell adhesion and matrix degradation.
  • ADAM15 (a disintegrin and metalloproteinase) possesses metalloproteinase and RGD domains.
  • Endothelial cell and platelet interactions are crucial in cardiovascular pathologies.

Purpose of the Study:

  • To investigate ADAM15's role as an endothelial cell adhesion receptor.
  • To examine ADAM15 interactions with platelets regarding adhesion, activation, and thrombus formation.

Main Methods:

  • Studied ADAM15 expression on human umbilical vein endothelial cells (HUVECs).
  • Assessed platelet adhesion to immobilized recombinant ADAM15 under static and shear conditions.
  • Utilized blocking antibodies against integrins (GPIIb-IIIa, αvβ3).
  • Measured platelet secretion markers (CD62P, CD40L) after soluble ADAM15 incubation.

Main Results:

  • ADAM15 is expressed on HUVECs.
  • Platelet adhesion to ADAM15 was enhanced under static and shear conditions, mediated by GPIIb-IIIa.
  • Soluble ADAM15 bound to activated GPIIb-IIIa and induced platelet secretion.
  • Adherent platelets on ADAM15 attracted additional platelets, promoting thrombus formation.

Conclusions:

  • ADAM15 functions as an endothelial adhesion receptor for platelets via GPIIb-IIIa.
  • Platelet adhesion to ADAM15 triggers activation, secretion, and thrombus development.
  • ADAM15 presents a potential therapeutic target for antithrombotic strategies in cardiovascular diseases.

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