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J. Exp. Med.,
Volume 186, Number 10, November 17, 1997 1757-1762
By

From the Department of * Oncology and Chemokines are a structurally related family of cytokines that are important for leukocyte trafficking. The C-C chemokine monocyte chemoattractant protein-1 (MCP-1) is a potent
monocyte activator in vitro and has been associated with monocytic infiltration in several inflammatory diseases. One C-C chemokine receptor, CCR2, has been identified that mediates
in vitro responses to MCP-1 and its close structural homologues. CCR2 has also recently been
demonstrated to be a fusion cofactor for several HIV isolates. To investigate the normal physiological function of CCR2, we generated mice with a targeted disruption of the ccr2 gene.
Mice deficient for CCR2 developed normally and had no hematopoietic abnormalities. However, ccr2
Experimental Pathology, Bristol-Myers Squibb
Pharmaceutical Research Institute, Princeton, New Jersey 08543-4000; and the § Department of
Microbiology, Bristol-Myers Squibb Pharmaceutical Research Institute, Wallingford, Connecticut
06492-7660
/
mice failed to recruit macrophages in an experimental peritoneal inflammation
model. In addition, these mice were unable to clear infection by the intracellular bacteria, Listeria monocytogenes. These results suggest that CCR2 has a nonredundant role as a major mediator
of macrophage recruitment and host defense against bacterial pathogens and that MCP-1 and
other CCR2 ligands are effectors of those functions.
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