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Related Collections Phagocytes Chemokines, Cytokines, and Interleukins Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 April 2001, Vol. 97, No. 7, pp. 1920-1924 CHEMOKINES Eotaxin is a natural antagonist for CCR2 and an agonist for CCR5 Patricia Ogilvie, Giuseppe Bardi, Ian Clark-Lewis, Marco Baggiolini, and Mariagrazia Uguccioni From the Institute for Research in Biomedicine, Bellinzona, Switzerland; Theodor Kocher Institute, University of Bern, Bern, Switzerland; Biochemical Research Center, University of British Columbia, Vancouver, Canada. Eotaxin is a potent inducer of eosinophil chemotaxis and was considered as a selective ligand of the CC chemokine receptor 3 (CCR3), which is expressed on eosinophils, basophils, and Th2 lymphocytes. This study shows that eotaxin also interacts with CCR2 and CCR5 and can, thus, affect the responses of monocytes, which express both receptors. In human monocytes pretreatment with eotaxin decreased responsiveness to MCP-1, a selective ligand for CCR2, as well as to RANTES and MIP-1, which bind to CCR5. Similar effects were obtained with transfected cells expressing CCR2 or CCR5, but here a difference became apparent: Eotaxin triggered CCR5 at a concentration of 100 nM but not CCR2 even at 1 µM, suggesting an antagonistic effect on this receptor. In agreement with this observation, eotaxin induced internalization of CCR5 but not of CCR2 in human monocytes and transfected cells. Binding studies showed that eotaxin displaces 125 I-MCP-1 from monocytes in a concentration-dependent manner, and functional experiments showed that eotaxin inhibits MCP-1-induced chemotaxis and enzyme release. The results demonstrate that eotaxin is a CCR5 agonist and a CCR2 antagonist. 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