MOLECULAR-CLONING AND FUNCTIONAL EXPRESSION OF A NOVEL CC-CHEMOKINE RECEPTOR CDNA FROM A HUMAN BASOPHILIC CELL-LINE

被引:250
作者
POWER, CA
MEYER, A
NEMETH, K
BACON, KB
HOOGEWERF, AJ
PROUDFOOT, AEI
WELLS, TNC
机构
[1] Glaxo Inst. for Molecular Biology, CH-1228 Plan-les-Ouates, Geneva
[2] Glaxo Inst. for Molecular Biology, 1228 Plan-les-Ouates, Geneva, 14, chemin des Aulx
[3] DNAX Inst. of Molec. and Cell. Biol., Palo Alto
关键词
D O I
10.1074/jbc.270.33.19495
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We report the cloning and characterization of a novel basophil CC chemokine receptor, K5-5, from the human immature basophilic cell line KU-812. The predicted protein sequence of K5-5 shows only 49% identity to the macrophage inflammatory protein-1 alpha/RANTES receptor (CC CKR-1) and 47% identity to monocyte chemotactic protein-1 receptor (b form), suggesting that this cDNA encodes a novel member of the CC chemokine receptor family. Analysis of K5-5 mRNA expression indicates that it is restricted to leukocyte-rich tissues, In addition, we have shown significant levels of K5-5 mRNA in human basophils, which were up-regulated by treatment with interleukin-5. The CC chemokines, macrophage inflammatory protein-1 alpha, RANTES, and monocyte chemotactic protein-1 were able to stimulate a Ca2+-activated chloride channel in Xenopus laevis oocytes injected with R5-5 cRNA, whereas no signal was detected in response to monocyte chemotactic protein-2, macrophage inflammatory protein-1 beta, or the CXC chemokine, interleukin-8. Taken together, these results indicate for the first time the presence of a CC chemokine receptor on basophils, which functions as a ''shared'' CC chemokine receptor and may therefore be implicated in the pathogenesis of basophil-mediated allergic diseases.
引用
收藏
页码:19495 / 19500
页数:6
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