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

Dominant Myelopoietic Effector Functions Mediated by Chemokine Receptor CCR1

By Hal E. Broxmeyer,*Dagger Scott Cooper,*Dagger Giao Hangoc,*Dagger Ji-Liang Gao,§ and Philip M. Murphy§

From the * Department of Microbiology/Immunology, the Department of Medicine, and the Walther Oncology Center, Indiana University School of Medicine, Indianapolis, Indiana 46202; the Dagger  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

Macrophage inflammatory protein (MIP)-1alpha , 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-1alpha binds at least three chemokine receptors. To determine if CCR1 was dominantly mediating the above activities of MIP-1alpha , CCR1-deficient (-/-) mice, produced by targeted gene disruption, were used. MIP-1alpha 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-1alpha 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-1alpha . These results implicate CCR1 as a dominant receptor for MIP-1alpha enhancement of proliferation of lineage-committed MPCs and for mobilization of MPCs to the blood. CCR1 is not a dominant receptor for MIP-1alpha suppression of MPC proliferation, but it does negatively impact G-CSF-induced MPC mobilization.

Key words: CC chemokine receptor 1;  macrophage inflammatory protein 1alpha ;  progenitor cells;  proliferation;  mobilization


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