Improved micro-sampling methodology enables accurate platelet function analysis.

Area of Science:

• Biomedical Science
• Hematology
• Translational Research

Background:

• Platelet function assays are crucial for diagnosing and managing bleeding disorders.
• Traditional venipuncture for these assays is invasive and can limit point-of-care testing.
• Developing minimally invasive micro-sampling methods is essential for improving patient comfort and accessibility.

Purpose of the Study:

• To develop and evaluate novel micro-sampling techniques for platelet function analysis in both human and mouse models.
• To compare the accuracy and reliability of micro-sampling methods against standard venipuncture and terminal bleeding techniques.
• To assess the potential of these methods for facilitating point-of-care platelet function testing.

Main Methods:

• Blood collection via finger-prick (capillary) and venipuncture (venous) in humans (n=14).
• Blood collection via modified tail vein bleeding and terminal bleeding in mice (n=5).
• Platelet activation assessment using flow cytometry measuring fibrinogen binding and P-selectin exposure in response to agonists (ADP, CRP-XL, TRAP-6).

Main Results:

• Human capillary and venous samples showed comparable platelet sensitivity (EC50) and capacity, with a notable exception in P-selectin exposure to CRP-XL.
• Mouse micro-sampling (tail vein) and terminal bleeding methods yielded similar EC50 and capacity values for platelet activation.
• The developed micro-sampling methods demonstrated viability as alternatives to standard procedures, maintaining assay accuracy.

Conclusions:

• Novel finger-prick and tail vein micro-sampling methods are effective for platelet function analysis in humans and mice.
• These minimally invasive techniques preserve assay accuracy, offering improved accessibility for point-of-care testing.
• The methods contribute to the reduction and refinement of animal models in biomedical research.