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A sub-population of stem cells termed side population (SP) has a unique ability for the efflux of Hoechst 33342 dye. Recently, it was hypothesized that efflux properties might facilitate the efflux of accumulated chemotherapeutic drugs and as such constitute a tumor escape mechanism. As SP characterization in leukemia is incomplete, we characterized SP frequencies in 19 children diagnosed with acute B cell precursor leukemia (BCP-ALL), AML and T-ALL and described engraftment properties in immune-compromised NOD.Cg-Prkdc(scid)IL2rg(tmWjl)/Sz (NSG) mice. SP cells are detectable in children and mice irrespective of the origin of the leukemia and flow-cytometric analysis reveals that the SP population is a distinct sub-population. Functionally, the SP size remains stable over serial transplantations indicating that the "stemness" potential of our SP sample cohort was overall low. SP cells exist in pediatric leukemia and are maintainable in NSG mice. Thus, our observations may facilitate down-stream characterization of LSCs in future studies. Copyright © 2015 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.


Maya C Andre, Kai-Erik Witte, Reinhard A Hoerrmann, Anja Schmitt, Rupert Handgretinger, Martin Ebinger. Hoechst 33342 Staining Identifies the Progenitor Side Population in NOD.Cg-PrkdcscidIL2rgtmWjl/Sz Mice Harboring Pediatric Leukemias. In vivo (Athens, Greece). 2015 Nov-Dec;29(6):661-9

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PMID: 26546522

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