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Structure and Function of Platelets01:18

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The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
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Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets
10:08

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Published on: November 22, 2024

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Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets.

Marta Brambilla1, Alessia Becchetti1, Kevin Nallio1

  • 1Centro Cardiologico Monzino IRCCS.

Journal of Visualized Experiments : Jove
|December 9, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a standardized flow cytometry protocol to accurately measure Tissue Factor (TF)-positive platelets, crucial for assessing thrombotic risk in clinical settings. The method quantifies intracellular and surface TF in resting and activated platelets from whole blood or plasma.

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Area of Science:

  • Hematology
  • Immunology
  • Biotechnology

Background:

  • Tissue Factor (TF) is a key initiator of blood coagulation and thrombus formation.
  • TF is stored intracellularly in a subset of human platelets and exposed upon activation.
  • Increased TF-positive platelets correlate with prothrombotic states, but their accurate measurement is challenging.

Purpose of the Study:

  • To establish a standardized flow cytometry protocol for quantifying TF-positive platelets.
  • To enable reliable assessment of both intracellular and surface TF in various platelet preparations.
  • To address past controversies in TF-positive platelet evaluation.

Main Methods:

  • Detailed protocol for flow cytometry analysis of TF-positive platelets in whole blood, platelet-rich plasma (PRP), and washed platelets.
  • Includes procedures for sample collection, preparation, cell stimulation, labeling, fixation, and permeabilization.
  • Specific guidance on flow cytometry settings for accurate platelet population identification and TF event analysis.

Main Results:

  • The protocol allows for quantification of TF-positive platelets under resting and activated conditions.
  • It differentiates between intracellular and surface TF expression.
  • The method is applicable to both whole blood and isolated platelet fractions, with considerations for PRP preparation.

Conclusions:

  • A standardized, detailed protocol for measuring TF-positive platelets using flow cytometry has been developed.
  • This method provides a reliable tool for assessing platelet-associated TF, aiding in the evaluation of thrombotic risk.
  • The protocol addresses pre-analytical variables and offers comprehensive steps for accurate quantification.