Metabolomics evaluation of early-storage red blood cell rejuvenation at 4 degrees C and 37 degrees C

BACKGROUND: Refrigerated red blood cell (RBC) storage results in the progressive accumulation of biochemical and morphological alterations collectively referred to as the storage lesion. Storage-induced metabolic alterations can be in part reversed by rejuvenation practices. However, rejuvenation requires an incubation step of RBCs for 1 hour at 37 degrees C, limiting the practicality of providing on-demand, rejuvenated RBCs. We tested the hypothesis that the addition of rejuvenation solution early in storage as an adjunct additive solution would prevent-in a time window consistent with the average age of units transfused to sickle cell recipients at Duke (15 days)-many of the adverse biochemical changes that can be reversed via standard rejuvenation, while obviating the incubation step. STUDY DESIGN AND METHODS: Metabolomics analyses were performed on cells and supernatants from AS-1 RBC units (n54), stored for 15 days. Units were split into pediatric bag aliquots and stored at 4 degrees C. These were untreated controls, washed with or without rejuvenation, performed under either standard (37 degrees C) or cold (4 degrees C) conditions. RESULTS: All three treatments removed most metabolic storage by-products from RBC supernatants. However, only standard and cold rejuvenation provided significant metabolic benefits as judged by the reactivation of glycolysis and regeneration of adenosine triphosphate and 2,3-diphosphoglycerate. Improvements in energy metabolism also translated into increased capacity to restore the total glutathione pool and regenerate oxidized vitamin C in its reduced (ascorbate) form. CONCLUSION: Cold and standard rejuvenation of 15-day-old RBCs primes energy and redox metabolism of stored RBCs, while providing a logistic advantage for routine blood bank processing workflows.