Red blood cell (RBC) encapsulated L-asparaginase is a novel therapeutic for the treatment of asparagine
auxotrophic malignancies. The enzyme-loaded red blood cells function as bioreactors to deplete bloodstream substrate.
This delivery system provides improved pharmacodynamics with protection from circulating proteolytic enzymes and
avoidance of early liver or renal clearance. The “drug” is manufactured with ABO and Rh compatible donor blood when a
prescription is received. Because of the industrial scale manufacturing, the “drug” is transfused the day of receipt at the
clinical site. Preliminary clinical studies show utility in childhood and adult acute lymphoblastic leukemia. Based on previous
studies of applications in different diseases and assessment of different biomarkers, we propose this agent offers a
safe and potentially effective treatment for a subset of chemotherapy refractory acute myeloid leukemia patients. The history,
chemistry, biology, pharmacology, and relevant clinical experiences with L-asparaginase as well as the properties
and proposed protocols with the red cell-encapsulated enzyme are reviewed.
Keywords: Red blood cell encapsulation, L-asparaginase and AML, Red blood cell (RBC), novel therapeutic, bloodstream, pharmacodynamics, proteolytic enzyme, leukemia, chemotherapy, pharmacology, encapsulated enzyme
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