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Volume 271, Number 36, Issue of September 6, 1996 pp. 21814-21819
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

Differential Regulation of G-protein-mediated Signaling by Chemokine Receptors

(Received for publication, April 10, 1996, and in revised form, June 25, 1996)

Hidenori Arai Dagger and Israel F. Charo §

From the Dagger  Gladstone Institute of Cardiovascular Disease, the § Department of Medicine, and the  Daiichi Research Center, University of California, San Francisco, California 94141-9100

Monocyte chemoattractant protein-1 (MCP-1) is a member of a family of chemotactic cytokines that induce directed migration of leukocytes via activation of seven-transmembrane domain receptors. To identify G-proteins that couple to the two forms of the MCP-1 receptor, as well as to related chemokine receptors, we have performed cotransfection experiments in mammalian cells. In COS-7 cells, the type A and type B MCP-1 receptors coupled to Galpha i, Galpha q, and Galpha 16, whereas the macrophage inflammatory protein-1alpha /RANTES (regulated on activation, normal T cell-expressed and secreted) receptor (C-CR1) coupled to Galpha i and Galpha q but failed to couple to Galpha 16. In HEK-293 cells, however, the MCP-1 receptors and C-CR1 coupled to Galpha q but failed to couple to Galpha 16. In contrast, the interleukin-8 and C5a receptors did not couple to Galpha q in either COS-7 or HEK-293 cells but did couple to Galpha 16. Exchange of intracellular loops between the MCP-1 and interleukin-8 receptors to create chimeric receptors revealed that the third loop of the MCP-1 receptor accounted for virtually all of the coupling to Galpha q. We conclude that the MCP-1 and related chemokine receptors couple to multiple G-proteins, that coupling is cell type-specific, and that the third intracellular loop of the C-C type receptors mediates Galpha q coupling.




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