Sodium citrate contributes to the platelet storage lesion

Transfusion
Todd M GetzStephen J Wagner

Abstract

Sodium citrate has become the preferred anticoagulant used for apheresis collection and has been included in commercial platelet additive solutions (PASs) since PAS-II. It was suggested that citrate be included in PASs to prevent spontaneous aggregation. Reports in cell lines and cord blood have demonstrated that concentrations of citrate present in PAS formulations (10 mM) cause apoptosis. We evaluated whether the removal of citrate from PAS-III could improve platelet storage. Study 1 evaluated the effects of a citrate dose response on the storage of platelets in 65% PAS containing sodium chloride, sodium acetate, and phosphate. Study 2 compared the cell quality and function of platelets stored in 65% citrate-free PAS-III or PAS-III containing 10 mM of citrate. Measurements included cell count, blood gases, flow cytometry analysis of surface activation markers, and aggregation. Study 1 identified that inclusion of citrate in PAS resulted in a dose-dependent increase in glucose utilization, lactate formation, P-selectin expression, phosphatidylserine (PS) exposure, and reactive oxygen species (ROS) formation. Study 2 showed similar results in which platelets stored in citrate-free PAS-III benefited through better maintenance of...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis