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The Journal of Immunology, Vol 148, Issue 4 1261-1264, Copyright © 1992 by American Association of Immunologists

ARTICLES

Characterization of complementary DNA clones encoding the rabbit IL-8 receptor

J Lee, WJ Kuang, GC Rice and WI Wood
Department of Molecular Biology Genetech, Inc., South San Francisco, CA 94080.

IL-8 is a proinflammatory cytokine that functions as a chemoattractant for neutrophils. Recently, cDNA clones encoding the human neutrophil IL- 8R were isolated by an expression cloning strategy. The amino acid sequence of the human IL-8R was sufficiently similar to a published sequence for an isoform of the rabbit FMLP receptor that we considered the possibility that the rabbit sequence might bind IL-8 as well. In order to establish its ligand specificity, we have isolated and characterized cDNA clones encoding the rabbit receptor. These cDNA clones, when expressed in mammalian cells, confer high affinity IL-8 binding (Kd = 3.6 nM), lack detectable binding of FMLP, and produce a transient increase in the intracellular Ca2+ concentration in response to IL-8 but not to FMLP. These data demonstrate that the reported rabbit FMLP receptor is the rabbit IL-8R, not an isoform of the FMLP receptor. In addition, the amino acid sequence of the rabbit IL-8R encoded by these cDNA clones differs at 23 amino acids (of 355) from that previously published.


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