title: Cloning and pharmacological characterization of CXCR1 and CXCR2 from Macaca fascicularis.
abstract: Two genes with high sequence homology to human CXCR1 (hCXCR1) and CXCR2 (hCXCR2) were cloned from blood of cynomolgus monkey (Macaca fascicularis). Comparison of the expression pattern of these receptors in different species demonstrated that, like in humans, cynomolgus CXCR1 (cCXCR1) and CXCR2 (cCXCR2) are highly expressed in blood. Membranes from transfected BaF3 cells expressing cCXCR1 bind interleukin (IL)-8 with an affinity similar to hCXCR1 (Kd values, 170 +/- 87 and 103 +/- 37 pM, respectively) and show low binding affinity to Gro-alpha. Cynomolgus CXCR2 also binds hIL-8 but with somewhat higher affinity than the hCXCR2 (46 +/- 28 and 220 +/- 14 pM, respectively). Surprisingly, cCXCR2 has a reduced binding affinity to hGro-alpha (3.7 +/- 2.2 nM), a specific ligand of hCXCR2 (540 +/- 140 pM). Furthermore, the CXCR2-specific antagonist SB225002 [N-(2-hydroxy-4-nitrophenyl)-N'-(2-bromophenyl)urea] is 10-fold more potent in inhibiting IL-8 binding to hCXCR2 than to cCXCR2, suggesting that some of the observed differences in the amino acid sequences of the human and monkey receptor affect ligand binding sites or the conformation of the receptor. Both cynomolgus receptors were functionally active in inducing guanosine 5'-O-(3-thio)triphosphate exchange on membranes in response to IL-8 and Gro-alpha and in mediating chemotactic activity of recombinant BA/F3 cells in response to IL-8 and Gro-alpha. These results identify the products of the novel cynomolgus genes as functional homologs of hCXCR1 and hCXCR2.
authors.affiliation: Department of Immunology, Schering-Plough Research Institute, Kenilworth, New Jersey 07033, USA.
authors.forename: R William
authors.initials: RW
authors.lastname: Hipkin
authors.forename: Gregory
authors.initials: G
authors.lastname: Deno
authors.forename: Jay
authors.initials: J
authors.lastname: Fine
authors.forename: Yongliang
authors.initials: Y
authors.lastname: Sun
authors.forename: Brian
authors.initials: B
authors.lastname: Wilburn
authors.forename: Xuedong
authors.initials: X
authors.lastname: Fan
authors.forename: Waldemar
authors.initials: W
authors.lastname: Gonsiorek
authors.forename: Maria T
authors.initials: MT
authors.lastname: Wiekowski
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015870:Gene Expression; D006801:Humans; D016209:Interleukin-8 / Q000494:pharmacology; D008252:Macaca fascicularis / Q000235:genetics*; D008969:Molecular Sequence Data; D023062:Receptors, Interleukin-8A / Q000737:chemistry / Q000187:drug effects / Q000235:genetics*; D023063:Receptors, Interleukin-8B / Q000737:chemistry / Q000187:drug effects / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity
chemical_list: D016209:Interleukin-8; D023062:Receptors, Interleukin-8A; D023063:Receptors, Interleukin-8B