Monocyte chemoattractant protein 1 (MCP-1) is a CC chemokine that attracts monocytes, memory T lymphocytes, and natural killer cells. Because other chemokines have similar target cell specificities and because CCR2, a cloned MCP-1 receptor, binds other ligands, it has been uncertain whether MCP-1 plays a unique role in recruiting mononuclear cells in vivo. To address this question, we disrupted SCYA2 (the gene encoding MCP-1) and tested MCP-1–deficient mice in models of inflammation. Despite normal numbers of circulating leukocytes and resident macrophages, MCP-1−/− mice were specifically unable to recruit monocytes 72 h after intraperitoneal thioglycollate administration. Similarly, accumulation of F4/80+ monocytes in delayed-type hypersensitivity lesions was impaired, although the swelling response was normal. Development of secondary pulmonary granulomata in response to Schistosoma mansoni eggs was blunted in MCP-1−/− mice, as was expression of IL-4, IL-5, and interferon γ in splenocytes. In contrast, MCP-1−/− mice were indistinguishable from wild-type mice in their ability to clear Mycobacterium tuberculosis. Our data indicate that MCP-1 is uniquely essential for monocyte recruitment in several inflammatory models in vivo and influences expression of cytokines related to T helper responses.
Abnormalities in Monocyte Recruitment and Cytokine Expression in Monocyte Chemoattractant Protein 1–deficient Mice
The authors thank Dr. Arlene Sharpe for blastocyst injections; Dr. Abul Abbas for helpful comments and encouragement; Drs. Rolf Freter and Charles Stiles for the 5′ genomic MCP-1 fragment; Dr. Maja Sirotkovic for technical help; and the staff of the Animal Resource Division at Dana-Farber Cancer Institute for its superb care and handling of the mice used in this study. We also appreciate the administrative support of Laurie Geronimo.
This work was funded by National Institutes of Health grants CA-53091, HL-35276, and HL-51366. B.J. Rollins is a Scholar of the Leukemia Society of America.
Address correspondence to Barrett Rollins, Dana-Farber Cancer Institute, 44 Binney St., Boston, MA 02115. Phone: 617-632-3896; Fax: 617-632-5417; E-mail: [email protected]
Abbreviations used in this paper: DNFB, 2,4-dinitro-1-fluorobenzene; DTH, delayed-type hypersensitivity; MCP, monocyte chemoattractant protein; MIP, macrophage inflammatory protein; SEA, Schistosome egg antigen.
Bao Lu, Barbara J. Rutledge, Long Gu, Joseph Fiorillo, Nicholas W. Lukacs, Steven L. Kunkel, Robert North, Craig Gerard, Barrett J. Rollins; Abnormalities in Monocyte Recruitment and Cytokine Expression in Monocyte Chemoattractant Protein 1–deficient Mice . J Exp Med 16 February 1998; 187 (4): 601–608. doi: https://doi.org/10.1084/jem.187.4.601
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