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© The Rockefeller University Press, 0022-1007/1997/9/825/ $5.00
The Journal of Experimental Medicine, Volume 186, Number 6, September 15, 1997 825-835


Articles

Cloning and Characterization of a Specific Receptor for the Novel CC Chemokine MIP-3{alpha} from Lung Dendritic Cells

Christine A. Power*, Dennis J. Church*, Alexandra Meyer*, Sami Alouani*, Amanda E.I. Proudfoot*, Ian Clark-Lewis{ddagger}, Silvano Sozzani§, Alberto Mantovani§, and Timothy N.C. Wells*

From the * Geneva Biomedical Research Institute, GlaxoWellcome Research and Development, Geneva, Switzerland; {ddagger} University of British Columbia, Vancouver, Canada; and § Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy

Dendritic cells are potent antigen-presenting cells involved in the initiation of immune responses. The trafficking of these cells to tissues and lymph nodes is mediated by members of the chemokine family. Recently, a novel CC chemokine known as MIP-3{alpha} or liver and activation-regulated chemokine has been identified from the EMBL/GenBank/DDBJ expressed sequence tag database. In the present study, we have shown that the messenger RNA for MIP-3{alpha} is expressed predominantly in inflamed and mucosal tissues. MIP-3{alpha} produced either synthetically or by human embryonic kidney 293 cells is chemotactic for CD34+-derived dendritic cells and T cells, but is inactive on monocytes and neutrophils. MIP-3{alpha} was unable to displace the binding of specific CC or CXC chemokines to stable cell lines expressing their respective high affinity receptors, namely CCR1–5 and CXCR1 and CXCR2, suggesting that MIP-3{alpha} acts through a novel CC chemokine receptor. Therefore, we used degenerate oligonucleotide-based reverse transcriptase PCR to identify candidate MIP-3{alpha} receptors in lung dendritic cells. Our results show that the orphan receptor known as GCY-4, CKRL-3, or STRL-22 is a specific receptor for MIP-3{alpha}, and that its activation leads to pertussis toxin–sensitive and phospholipase C–dependent intracellular Ca2+ mobilization when it is expressed in HEK 293 cells.


Address correspondence to Dr. C.A. Power, Geneva Biomedical Research Institute, GlaxoWellcome Research and Development S.A., 14, chemin des Aulx, 1228, Plan-les-Ouates, Geneva, Switzerland. Phone: 00-41-22-7069-752; FAX: 00-41-22-7946-965; E-mail: CAP15123{at}ggr.co.uk

1 Abbreviations used in this paper: CAT, cloramphenicol acetyl transferase; DARC, Duffy antigen receptor; DCs, dendritic cells; DCCR2, dendritic cell chemokine receptor 2; EST, expressed sequence tag; HEK, human embryonic kidney; LAMCs, loosely adherent mononuclear cells; LARC, liver and activation-regulated chemokine; mRNA, messenger RNA; PLC, phospholipase C; RT, reverse transcriptase; SDF-1, stromal cell– derived factor-1.


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