The Journal of Experimental Medicine
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J. Exp. Med.
Volume 186, Number 1, July 7, 1997 165-170

BRIEF DEFINITIVE REPORT:
Identification of CCR8: A Human Monocyte and Thymus Receptor for the CC Chemokine I-309

By H. Lee Tiffany,* Laura L. Lautens,Dagger Ji-Liang Gao,* James Pease,*par Massimo Locati,* Christophe Combadiere,* William Modi, Tom I. Bonner,Dagger § and Philip M. Murphy*

From the * Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, and the Dagger  Laboratory of Cell Biology and § Section on Genetics, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland 20892; par  the Krebs Institute, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield, S10 2TN, United Kingdom; the  Biological Carcinogenesis and Development Program, Program Resources, Incorporated/Dyncorp, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, Maryland 21702-1201

The human CC chemokine I-309 is a potent monocyte chemoattractant and inhibits apoptosis in thymic cell lines. Here, we identify a specific human I-309 receptor, and name it CCR8 according to an accepted nomenclature system. The receptor has seven predicted transmembrane domains, is expressed constitutively in monocytes and thymus, and is encoded by a previously reported gene of previously unknown function named, alternatively, CY6, TER1, and CKR-L1. After transfection with the CY6 open reading frame, a mouse pre-B cell line exhibited calcium flux and chemotaxis in response to I-309 (EC50 = 2 nM for each), whereas 20 other chemokines were inactive. Signaling was sensitive to pertussis toxin, suggesting coupling to a Gi-type G protein. These properties parallel those of endogenous I-309 receptors expressed in an HL-60 clone 15 cell line model. The apparent monogamous relationship between I-309 and CCR8 is unusual among known CC chemokines and known CC chemokine receptors. CCR8 may regulate monocyte chemotaxis and thymic cell line apoptosis.


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