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J. Exp. Med.,
Volume 189, Number 12, June 21, 1999 1987-1992
By



From the * Department of Microbiology/Immunology, the Department of Medicine, and the Walther
Oncology Center, Indiana University School of Medicine, Indianapolis, Indiana 46202; the Macrophage inflammatory protein (MIP)-1
Walther
Cancer Institute, Indianapolis, Indiana 46208; and the § Laboratory of Host Defenses, National
Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892
, a CC chemokine, enhances proliferation of mature subsets of myeloid progenitor cells (MPCs), suppresses proliferation of immature MPCs,
and mobilizes mature and immature MPCs to the blood. MIP-1
binds at least three chemokine receptors. To determine if CCR1 was dominantly mediating the above activities of MIP-1
,
CCR1-deficient (
/
) mice, produced by targeted gene disruption, were used. MIP-1
enhanced colony formation of marrow granulocyte/macrophage colony-forming units (CFU-GM),
responsive to stimulation by granulocyte/macrophage colony-stimulating factor (GM-CSF),
and CFU-M, responsive to stimulation by M-CSF, from littermate control CCR1+/+ but not
CCR1
/
mice. Moreover, MIP-1
did not mobilize MPCs to the blood or synergize with
G-CSF in this effect in CCR1
/
mice. However, CCR1
/
mice were increased in sensitivity to MPC mobilizing effects of G-CSF. Multi-growth factor-stimulated MPCs in CCR1
/
and CCR1+/+ marrow were equally sensitive to inhibition by MIP-1
. These results implicate
CCR1 as a dominant receptor for MIP-1
enhancement of proliferation of lineage-committed
MPCs and for mobilization of MPCs to the blood. CCR1 is not a dominant receptor for
MIP-1
suppression of MPC proliferation, but it does negatively impact G-CSF-induced
MPC mobilization.
;
progenitor
cells;
proliferation;
mobilization
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