Feasibility evaluation of two novel systems for the automated preparation and extended storage of DMSO cryopreserved platelets

Abstract

BackgroundManufacturing methods for dimethyl sulfoxide (DMSO)‐cryopreserved platelets (CPPs) are manual and labor intensive. Thawing and prepare‐for‐transfusion steps are in an open system that requires transfusion within 4 h. A fill‐and‐finish system (CUE) can automate the manufacturing process. A newly configured bag system allows freezing, thawing, and use of resuspension solutions while maintaining the functionally closed system, and extending the post‐thaw shelf life beyond 4 h. Our objective is to evaluate the feasibility of the CUE system and the functionally closed bag system.Study design and MethodsDMSO was volumetrically added to double‐dose apheresis platelets, concentrated, and delivered to a 50‐ or 500‐mL ethylene‐vinyl acetate (EVA) bag by the CUE (n = 12). The functionally closed bag system contained 25 mL platelet additive solution 3 (PAS‐3) in a 50‐mL EVA bag. Control CPP (n = 2) were manually prepared. PAS‐3 and CPP were thawed together. CPP were stored up to 98 h (20–24°C) and tested using a standard assay panel.ResultsCUE prepared CPP met the design targets: volume, platelet content, and DMSO concentration. CUE CPP P‐selectin was high. CD42b, phosphatidylserine (PS) expression, and live cell percentage were favorable compared to controls and favorably maintained over storage. The thrombin generation potency was slightly reduced compared to controls. The 50 mL EVA bag maintained pH for up to 30 h, and the 500 mL EVA bag beyond 76 h.DiscussionThe CUE system presents a technically feasible method to prepare CPP. A functionally closed bag system with resuspension solution was successful and can extend the post‐thaw storage time of CPP.

Cryopreserved Platelets in a Non-Toxic DMSO-Free Solution Maintain Hemostatic Function In Vitro

“…The most recent studies comprising trehalose or trehalose combined with phosphate have been conducted to decrease the pre-activation of the platelets [26,27]. Studies have also tried to remove DMSO prior to and post-freezing to reduce the final concentration of DMSO [28,29]. Furthermore, the usage of controlled-rate freezing (CRF) was evaluated by our group to study the risk of intracellular ice formation or dehydration during the freezing process.…”