Increased Responsiveness of Stored Platelets after Short-Term Refrigeration

Area of Science:

• Hematology
• Transfusion Medicine
• Platelet Biology

Background:

• Platelet refrigeration is explored for enhanced therapeutic responsiveness in acute hemorrhage.
• Cold temperature (CT) storage alleviates inhibitory signaling, boosting platelet reactivity.
• Short-term CT effects on apheresis-derived platelet concentrates (APC) require confirmation.

Purpose of the Study:

• To confirm the effects of short-term refrigeration on APC.
• To investigate the impact of 1-hour cold storage on platelet function and signaling.

Main Methods:

• APC were stored at room temperature for 1-2 days, then refrigerated for 1 hour.
• Platelet reactivity assessed via aggregation studies and fibrinogen binding (flow cytometry).
• Inhibitory signaling explored through VASP phosphorylation (flow cytometry/Western blot) and cyclic nucleotide levels.

Main Results:

• 1-hour cold storage increased APC aggregation responses to ADP, collagen, and TRAP-6.
• Elevated TRAP-6-induced fibrinogen binding was observed post-refrigeration.
• Decreased VASP phosphorylation and altered cGMP/cAMP levels indicated attenuated inhibitory signaling.

Conclusions:

• Short-term (1-hour) refrigeration of APC enhances platelet aggregation and responsiveness.
• This 'on demand' refrigeration may improve platelet preparation for hemorrhage treatment.
• Further studies are warranted to validate APC refrigeration for clinical application.