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, 236 (1), 212-7

STRL22 Is a Receptor for the CC Chemokine MIP-3alpha

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STRL22 Is a Receptor for the CC Chemokine MIP-3alpha

F Liao et al. Biochem Biophys Res Commun.

Abstract

STRL22 is a human seven transmembrane domain orphan receptor related to known chemokine receptors and expressed in peripheral blood lymphocytes, tumor infiltrating lymphocytes and lymphoid tissues. MIP-3alpha/LARC/Exodus is a CC chemokine that is chemotactic for lymphocytes and that is expressed in activated cells, including monocytes, T cells, endothelial cells, and fibroblasts, and in liver, lung, and some lymphoid tissues. We report here that STRL22-transfected human embryonic kidney 293 cells demonstrated specific binding for MIP-3alpha and that MIP-3alpha, but no other chemokines, produced a calcium flux in the STRL22-transfected cells. We show that MIP-3alpha, unlike other chemokines, produced a calcium flux in freshly-isolated peripheral blood lymphocytes and we show that MIP-3alpha also produced a signal in tumor infiltrating lymphocytes that express STRL22. Since STRL22 is the sixth functional CC chemokine receptor identified, it should be re-named CCR6.

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