Cloning of a human seven-transmembrane domain receptor, LESTR, that is highly expressed in leukocytes - PubMed (original) (raw)
. 1994 Jan 7;269(1):232-7.
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- PMID: 8276799
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Cloning of a human seven-transmembrane domain receptor, LESTR, that is highly expressed in leukocytes
M Loetscher et al. J Biol Chem. 1994.
Free article
Abstract
Several chemotactic agonists including interleukin-8 (IL-8) and related cytokines have been shown to activate and attract leukocytes via seven-transmembrane domain, GTP-binding protein-coupled receptors. A cDNA clone, LESTR, encoding a protein of 352 amino acids, corresponding to a novel receptor of this type, was isolated from a human blood monocyte cDNA library. The sequence of the deduced protein, LESTR (leukocyte-derived seven-transmembrane domain receptor), has 92.6% identity with that of a recently reported bovine neuropeptide Y (NPY) receptor, boLCR1 (Rimland, J., Xin, W., Sweetnam, P., Saijoh, K., Nestler, E. J., and Duman, R. S. (1991) Mol. Pharmacol. 40, 869-875). LESTR, however, is more similar (> 34%) to the IL-8 receptors, IL-8R1 and IL-8R2, than to several NPY receptors of different origin (< 20%). In the monocyte library, LESTR cDNA fragments were about 20 times as frequent as cDNA coding for IL-8R1 and IL-8R2, and much higher levels of LESTR- than IL-8R-specific mRNA were found in human blood neutrophils and lymphocytes. LESTR transcripts, by contrast, were low or undetectable in several neuroblastoma cell lines that are widely used to study NPY functions. Transfected cells expressing high levels of LESTR mRNA did not bind radiolabeled NPY, IL-8, NAP-2, GRO alpha, PF4, IP10, MCP-1, MCP-3, MIP-1 alpha, HC14, I309, RANTES, C3a, or LTB4. NPY also failed to bind to neutrophils, monocytes, and lymphocytes, to elicit responses in vitro such as Ca2+ changes, shape change, chemotaxis, enzyme release, and the respiratory burst, and to induce leukocyte accumulation upon injection in rats and rabbits. Although the ligand for LESTR could not be identified among a large number of chemotactic cytokines, the high expression in white blood cells and the marked sequence relation to IL-8R1 and IL-8R2 suggest that LESTR may function in the activation of inflammatory cells.
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