BACKGROUND: Previously, we evaluated the Mirasol pathogen reduction technology (PRT) system on platelet (PLT) function before resuspension. We now evaluated this system in the presence of PLT additive solution (PAS).STUDY DESIGN AND METHODS: Double-dose PLTs (n = 15) were generated using a commercially available apheresis system (Trima, Version 5.2, CaridianBCT) allowing for the resuspension in SSP+ (MacoPharma) immediately after collection. Paired units (n = 30) were PRT treated (M) or remained untreated (C) and analyzed for metabolism (pH, pO(2) , glucose, lactate, adenosine triphosphate [ATP]), swirl, hypotonic shock response (HSR), turbidometric aggregation, CD62P expression, annexin A5 and lactate dehydrogenase (LDH) release, mitochondrial enzymatic reduction activity (MTS), transmembrane mitochondrial potential (Äø), and surface coverage (SC) during shear-induced adhesion throughout 8 days of storage.RESULTS: As seen previously, PRT treatment of PLT units, containing a mean of 3.9 ? 10(11) ± 0.3 ? 10(11) PLTs in 397 ± 10 mL with a 32% to 34% plasma carryover, was associated with significantly (p < 0.001) increased cell activation, acidity, and glycolytic flux. PRT treatment appeared to up regulate both oxidative pathway and adhesional properties as evidenced by significantly higher MTS reduction, oxygen consumption, and shear-induced SC on Day 1 (p ? 0.016). While no significant differences were found for LDH release and ATP content (except for Day 8), M units were significantly inferior (p ? 0.021) for aggregation (TRAP-6); for Äø and annexin A5 release (by Day 5); and for swirl, HSR, and MTS reduction (by Day 7).CONCLUSION: PRT treatment in the presence of PAS was comparable to PRT treatment before resuspension preserving ATP content and mitochondrial function.
Adenosine Triphosphate Blood Platelets