Rupture Forces among Human Blood Platelets at different Degrees of Activation

TL;DR

This study measures the rupture forces between human blood platelets at various activation levels, revealing how activation and receptor blockade influence platelet adhesion strength, with implications for biocompatibility and platelet disorder assessment.

Contribution

First direct measurement of single platelet-platelet rupture forces at different activation states, advancing understanding of platelet mechanics during activation and aggregation.

Findings

Rupture force increases with platelet activation degree

Receptor blockade reduces rupture force

Quantitative data useful for biocompatibility and drug testing

Abstract

Little is known about mechanics underlying the interaction among platelets during activation and aggregation. Although the strength of a blood thrombus has likely major biological importance, no previous study has measured directly the adhesion forces of single platelet-platelet interaction at different activation states. Here, we filled this void first, by minimizing surface mediated platelet activation and second, by generating a strong adhesion force between a single platelet and an AFM cantilever, preventing early platelet detachment. We applied our setup to measure rupture forces between two platelets using different platelet activation states, and blockade of platelet receptors. The rupture force was found to increase proportionally to the degree of platelet activation, but reduced with blockade of specific platelet receptors. Quantification of single platelet-platelet interaction provides major perspectives for testing and improving biocompatibility of new materials; quantifying the effect of drugs on platelet function; and assessing the mechanical characteristics of acquired/inherited platelet defects.