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Original Article
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Volume 351:657-667 August 12, 2004 Number 7
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Granulocyte–Macrophage Progenitors as Candidate Leukemic Stem Cells in Blast-Crisis CML
Catriona H.M. Jamieson, M.D., Ph.D., Laurie E. Ailles, Ph.D., Scott J. Dylla, Ph.D., Manja Muijtjens, M.S., Carol Jones, B.A., James L. Zehnder, M.D., Jason Gotlib, M.D., Kevin Li, Ph.D., Markus G. Manz, M.D., Armand Keating, M.D., Charles L. Sawyers, M.D., and Irving L. Weissman, M.D.

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 by Clarke, M. F.

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ABSTRACT

Background The progression of chronic myelogenous leukemia (CML) to blast crisis is supported by self-renewing leukemic stem cells. In normal mouse hematopoietic stem cells, the process of self-renewal involves the {beta}-catenin–signaling pathway. We investigated whether leukemic stem cells in CML also use the {beta}-catenin pathway for self-renewal.

Methods We used fluorescence-activated cell sorting to isolate hematopoietic stem cells, common myeloid progenitors, granulocyte–macrophage progenitors, and megakaryocyte–erythroid progenitors from marrow during several phases of CML and from normal marrow. BCR-ABL, {beta}-catenin, and LEF-1 transcripts were compared by means of a quantitative reverse-transcriptase–polymerase-chain-reaction assay in normal and CML hematopoietic stem cells and granulocyte–macrophage progenitors. Confocal fluorescence microscopy and a lymphoid enhancer factor/T-cell factor reporter assay were used to detect nuclear {beta}-catenin in these cells. In vitro replating assays were used to identify self-renewing cells as candidate leukemic stem cells, and the dependence of self-renewal on {beta}-catenin activation was tested by lentiviral transduction of hematopoietic progenitors with axin, an inhibitor of the {beta}-catenin pathway.

Results The granulocyte–macrophage progenitor pool from patients with CML in blast crisis and imatinib-resistant CML was expanded, expressed BCR-ABL, and had elevated levels of nuclear {beta}-catenin as compared with the levels in progenitors from normal marrow. Unlike normal granulocyte–macrophage progenitors, CML granulocyte–macrophage progenitors formed self-renewing, replatable myeloid colonies, and in vitro self-renewal capacity was reduced by enforced expression of axin.

Conclusions Activation of {beta}-catenin in CML granulocyte–macrophage progenitors appears to enhance the self-renewal activity and leukemic potential of these cells.


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From the Division of Hematology (C.H.M.J., J.L.Z., J.G.) and the Institute of Cancer and Stem Cell Biology and Medicine, Departments of Pathology and Developmental Biology (C.H.M.J., L.E.A., S.J.D., M.M., C.J., J.L.Z., K.L., M.G.M., I.L.W.), Stanford University School of Medicine, Stanford, Calif.; Princess Margaret Hospital, University of Toronto, Toronto (A.K.); and the University of California at Los Angeles, Los Angeles (C.L.S.).

Address reprint requests to Dr. Weissman at the Department of Pathology, Stanford University School of Medicine, B257 Beckman Center, 279 Campus Dr., Stanford, CA 94305-5323, or at ljquinn{at}stanford.edu.

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