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The major challenge in the development of small molecule chemokine receptor antagonists is the lack of cross-species activity to the receptor in the preclinical species. Rabbit models have been widely used to study the role of various inflammatory molecules in the development of inflammatory processes. Therefore, in this study, we report the cloning and characterization of rabbit CCR2. Data regarding the activity of the CCR2 antagonist will provide valuable tools to perform toxicology and efficacy studies in the rabbit model.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Sequence alignment indicated that rabbit CCR2 shares 80 % identity to human CCR2b. Tissue distribution indicated that rabbit CCR2 is abundantly expressed in spleen and lung. Recombinant rabbit CCR2 expressed as stable transfectants in U-937 cells binds radiolabeled<jats:sup>125<\/jats:sup>I-mouse JE (murine MCP-1) with a calculated<jats:italic>K<\/jats:italic><jats:sub><jats:italic>d<\/jats:italic><\/jats:sub>of 0.1 nM. In competition binding assays, binding of radiolabeled mouse JE to rabbit CCR2 is differentially competed by human MCP-1, -2, -3 and -4, but not by RANTES, MIP-1\u03b1 or MIP-1\u03b2. U-937\/rabbit CCR2 stable transfectants undergo chemotaxis in response to both human MCP-1 and mouse JE with potencies comparable to those reported for human CCR2b. Finally, TAK-779, a dual CCR2\/CCR5 antagonist effectively inhibits the binding of<jats:sup>125<\/jats:sup>I-mouse JE (<jats:italic>IC<\/jats:italic><jats:sub>50<\/jats:sub>= 2.3 nM) to rabbit CCR2 and effectively blocks CCR2-mediated chemotaxis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>In this study, we report the cloning of rabbit CCR2 and demonstrate that this receptor is a functional chemotactic receptor for MCP-1.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1471-2172-6-15","type":"journal-article","created":{"date-parts":[[2005,7,8]],"date-time":"2005-07-08T06:13:42Z","timestamp":1120803222000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Cloning and functional characterization of the rabbit C-C chemokine receptor 2"],"prefix":"10.1186","volume":"6","author":[{"given":"Deshun","family":"Lu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiu-juan","family":"Yuan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"suffix":"Jr","given":"Robert J","family":"Evans","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amy T","family":"Pappas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"He","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eric W","family":"Su","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chafiq","family":"Hamdouchi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chandrasekar","family":"Venkataraman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2005,7,7]]},"reference":[{"key":"76_CR1","doi-asserted-by":"crossref","first-page":"909","DOI":"10.1182\/blood.V90.3.909","volume":"90","author":"BJ Rollins","year":"1997","unstructured":"Rollins BJ: Chemokines. 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