Molecular cloning and characterization of a human eotaxin receptor expressed selectively on eosinophils - PubMed (original) (raw)

Comparative Study

Molecular cloning and characterization of a human eotaxin receptor expressed selectively on eosinophils

P D Ponath et al. J Exp Med. 1996.

Abstract

The chemokine eotaxin is unusual in that it appears to be a highly specific chemoattractant for eosinophils. Ligand-binding studies with radiolabeled eotaxin demonstrated a receptor on eosinophils distinct from the known chemokine receptors CKR-1 and -2. The distinct eotaxin binding site on human eosinophils also bound RANTES (regulated on activation T expressed and secreted) and monocyte chemotactic protein (MCP)3. We have now isolated a cDNA from eosinophils, termed CKR-3, with significant sequence similarity to other well characterized chemokine receptors. Cells transfected with CKR-3 cDNA bound radiolabeled eotaxin specifically and with high affinity, comparable to the binding affinity observed with eosinophils. This receptor also bound RANTES and MCP-3 with high affinity, but not other CC or CXC chemokines. Furthermore, receptor transfectants generated in a murine B cell lymphoma cell line migrated in transwell chemotaxis assays to eotaxin, RANTES, and MCP-3, but not to any other chemokines. A monoclonal antibody recognizing CKR-3 was used to show that eosinophils, but not other leukocyte types, expressed this receptor. This pattern of expression was confirmed by Northern blot with RNA from highly purified leukocyte subsets. The restricted expression of CKR-3 on eosinophils and the fidelity of eotaxin binding to CKR-3, provides a potential mechanism for the selective recruitment and migration of eosinophils within tissues.

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Comment in

• Chemokines active on eosinophils: potential roles in allergic inflammation.
  Kita H, Gleich GJ. Kita H, et al. J Exp Med. 1996 Jun 1;183(6):2421-6. doi: 10.1084/jem.183.6.2421. J Exp Med. 1996. PMID: 8676062 Free PMC article. Review. No abstract available.

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