Evaluation of Different Preparation Procedures of Pathogen Reduction Technology(Mirasol®)-Treated Platelets Collected by Plateletpheresis

Abstract

Background: The Mirasol® pathogen reduction technology (PRT) for platelet concentrates (PC) uses riboflavin and UV light (270–360 nm). We evaluated the impact of PRT on platelets in comparison to standard single-donor PC. Material and Methods: Platelets were resuspended in autologous plasma. After 2 h rest without agitation, PC were split into an untreated control unit (C-PC) and an immediately treated unit (T-PC) (series I). In series IV, split PC were stored under agitation over night before PRT was carried out. Platelet quality was assessed by pH, glucose consumption, lactate production rate, LDH, soluble sCD62p and CD62p expression with and without TRAP (thrombin receptor-activating peptide) over 7 days. Results: Series I: On day 5, pH values were lower for T-PC (6.8 ± 0.2 vs. 7.4 ± 0.1, C-PC), accompanied by a higher glucose consumption rate of 0.069 ± 0.016 vs. 0.035 ± 0.006 mmol/10¹² platelets/h and lactate production rate of 0.126 ± 0.031 vs. 0.063 ± 0.011 mmol/10¹² platelets/h. CD62p using TRAP was lower for T-PC (50 ± 11 vs. 62 ± 14%). Baseline activation was higher in T-PC (35 ± 12 vs. 28 ± 15%). Longer initial rest time had no impact on these results (series II/III/IV). Conclusion: PRT leads to an increase of platelet metabolism and activation independent of the length of the initial rest times. PC resuspended in autologous plasma should be stored at maximum up to day 5.