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An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers

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Resolution and reconstitution of interplatelet recognition during aggregation.

G Agam¹, A Livne

¹Department of Biology, Ben-Gurion University of the Negev, Beer Sheva, Israel.

Thrombosis and Haemostasis

|June 16, 1988

Summary

Fixed platelets with bound fibrinogen or thrombospondin can mediate aggregation. This study shows both proteins are key to platelet recognition during aggregation, enabling new insights into blood clotting mechanisms.

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Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells

Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells

Published on: October 26, 2009

Area of Science:

Biochemistry
Hematology
Cell Biology

Background:

Previous studies indicated fixed platelets with bound fibrinogen passively aggregate via released thrombospondin.
Thrombospondin selectively recognizes bound fibrinogen on aggregating platelets.

Purpose of the Study:

To investigate if fixed platelets with bound thrombospondin also participate passively in aggregation.
To fully resolve and reconstitute interplatelet recognition mechanisms using fibrinogen and thrombospondin.

Main Methods:

Demonstrating passive participation with fixed platelets bearing covalently-bound thrombospondin.
Utilizing two systems for resolution and reconstitution of platelet aggregation: (a) fixed platelets with bound fibrinogen aggregated with soluble thrombospondin, (b) fixed platelets with bound fibrinogen and fixed platelets with bound thrombospondin aggregated when combined.

Main Results:

The phenomenon of passive participation was confirmed with fixed platelets bearing covalently-bound thrombospondin.
Successful aggregation was achieved in both experimental systems, demonstrating reconstituted interplatelet recognition.
Aggregation occurred when fixed platelets with bound fibrinogen were stirred with soluble thrombospondin.
Aggregation occurred when fixed platelets with bound fibrinogen and fixed platelets with bound thrombospondin were combined and stirred.

Conclusions:

Fibrinogen and thrombospondin are crucial for molecular mechanisms of interplatelet recognition during aggregation.
These findings elucidate the roles of fibrinogen and thrombospondin in platelet aggregation and recognition.