Comparison of platelet aggregability and P-selectin surface expression on platelets isolated by different methods

Area of Science:

• Hematology
• Biochemistry
• Cell Biology

Background:

• Platelet isolation is crucial for various research applications.
• Common methods like washing and centrifugation can induce platelet activation.
• Preserving platelet function during isolation is essential for accurate experimental results.

Purpose of the Study:

• To compare the efficacy of three common platelet isolation methods.
• To evaluate the impact of isolation techniques on platelet aggregability and activation markers.
• To identify the optimal method for preserving platelet function.

Main Methods:

• Comparison of three platelet isolation techniques: washing, metrizamide-gradient centrifugation, and modified gel-filtration.
• Modified gel-filtration utilized BSA-Sepharose gel for enhanced platelet recovery.
• Assessment of platelet aggregability using ADP activation and P-selectin expression via fluorescence.
• Comparison with control platelets in native plasma.

Main Results:

• Gel-filtered platelets exhibited comparable aggregability to control platelets when activated with ADP.
• Platelets isolated via washing or centrifugation showed significantly higher P-selectin expression (twice the signal) compared to gel-filtered platelets and native platelets.
• Centrifugation-based methods induced a low but significant level of platelet activation.

Conclusions:

• Modified gel-filtration is a superior method for isolating blood platelets, preserving their aggregability.
• Washing and centrifugation methods lead to artificial platelet activation, affecting experimental outcomes.
• Gel-filtration minimizes platelet activation, making it ideal for studies requiring functional platelets.