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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/09/825/11 $2.00
Volume 186, Number 6, September 15, 1997 825-835

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

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

From the * Geneva Biomedical Research Institute, GlaxoWellcome Research and Development, Geneva, Switzerland; Dagger  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-3alpha 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-3alpha is expressed predominantly in inflamed and mucosal tissues. MIP-3alpha 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-3alpha 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-3alpha acts through a novel CC chemokine receptor. Therefore, we used degenerate oligonucleotide-based reverse transcriptase PCR to identify candidate MIP-3alpha 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-3alpha , and that its activation leads to pertussis toxin-sensitive and phospholipase C-dependent intracellular Ca2+ mobilization when it is expressed in HEK 293 cells.


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