Platelet factor 4 release from the platelets stored in platelet concentrates

Area of Science:

• Blood banking and transfusion medicine
• Hematology
• Platelet physiology

Background:

• Platelet concentrates (PCs) are crucial for hemostasis.
• Maintaining the integrity of granular components in platelets during storage is essential for their function upon infusion.
• Platelet factor 4 (PF-4) is an alpha-granular component released from platelets.

Purpose of the Study:

• To investigate factors influencing the release of PF-4 from platelets during PC storage.
• To understand the relationship between storage conditions and PF-4 release.

Main Methods:

• Studied PF-4 release from stored platelet concentrates.
• Assessed the impact of sedimentation and agitation on PF-4 release.
• Correlated PF-4 release with pH changes and platelet count per unit volume.

Main Results:

• Sedimentation and agitation significantly increased PF-4 release.
• PF-4 release correlated with a decrease in PC pH after one day of storage at 22°C.
• Higher platelet counts per unit volume were associated with increased PF-4 release and faster pH decline.

Conclusions:

• Concentrated pH is a critical factor affecting PF-4 release during PC storage.
• Reducing platelet count per unit volume in PCs enhances the preservation of granular components.
• Maintaining intact platelet metabolism during storage is vital for preserving platelet function.