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Leukemic Cells Create Bone Marrow Niches That Disrupt the Behavior of Normal Hematopoietic Progenitor Cells
Angela Colmone,
Maria Amorim,
Andrea L. Pontier,
Sheng Wang,
Elizabeth Jablonski,
Dorothy A. Sipkins*
Abstract:
The host tissue microenvironment influences malignant cell proliferationand metastasis, but little is known about how tumor-inducedchanges in the microenvironment affect benign cellular ecosystems.Applying dynamic in vivo imaging to a mouse model, we show thatleukemic cell growth disrupts normal hematopoietic progenitorcell (HPC) bone marrow niches and creates abnormal microenvironmentsthat sequester transplanted human CD34+ (HPC-enriched) cells.CD34+ cells in leukemic mice declined in number over time andfailed to mobilize into the peripheral circulation in responseto cytokine stimulation. Neutralization of stem cell factor(SCF) secreted by leukemic cells inhibited CD34+ cell migrationinto malignant niches, normalized CD34+ cell numbers, and restoredCD34+ cell mobilization in leukemic mice. These data suggestthat the tumor microenvironment causes HPC dysfunction by usurpingnormal HPC niches and that therapeutic inhibition of HPC interactionwith tumor niches may help maintain normal progenitor cell functionin the setting of malignancy.
Department of Medicine, Section of Hematology/Oncology, The University of Chicago, 5841 South Maryland Avenue MC 2115, Chicago, IL 60637, USA.
* To whom correspondence should be addressed: E-mail: dsipkins{at}medicine.bsd.uchicago.edu
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