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Volume 272, Number 45, Issue of November 7, 1997 pp. 28726-28731
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Regulation of Human Chemokine Receptors CXCR4
ROLE OF PHOSPHORYLATION IN DESENSITIZATION AND INTERNALIZATION

(Received for publication, August 27, 1997)

Bodduluri Haribabu Dagger , Ricardo M. Richardson Dagger , Ian Fisher Dagger , Silvano Sozzani , Stephen C. Peiper ** , Richard Horuk Dagger Dagger , Hydar Ali Dagger and Ralph Snyderman Dagger §§

From the Departments of Dagger  Medicine and §§ Immunology, Duke University Medical Center, Durham, North Carolina 27710, the  Instuito di Ricerche Farmacologiche, "Mario Negri," Milan, Italy, the ** James Graham Brown Cancer Center, Louisville, Kentucky 40292, and the Dagger Dagger  Department of Immunology, Berlex Biosciences, Richmond, California 94804

Members of the chemokine receptor family CCR5 and CXCR4 have recently been shown to be involved in the entry of human immunodeficiency virus (HIV) into target cells. Here, we investigated the regulation of CXCR4 in rat basophilic leukemia cells (RBL-2H3) stably transfected with wild type (Wt CXCR4) or a cytoplasmic tail deletion mutant (Delta Cyto CXCR4) of CXCR4. The ligand, stromal cell derived factor-1 (SDF-1) stimulated higher G-protein activation, inositol phosphate generation, and a more sustained calcium elevation in cells expressing Delta Cyto CXCR4 relative to Wt CXCR4. SDF-1 and phorbol 12-myristate 13-acetate (PMA), but not a membrane permeable cAMP analog induced rapid phosphorylation as well as desensitization of Wt CXCR4. Phosphorylation of Delta Cyto CXCR4 was not detected under any of these conditions. Despite lack of receptor phosphorylation, calcium mobilization by SDF-1 in Delta Cyto CXCR4 cells was partially desensitized by prior treatment with SDF-1. Of interest, the rapid release of calcium was inhibited without affecting the sustained calcium elevation, indicating independent regulatory pathways for these processes. PMA completely inhibited phosphoinositide hydrolysis and calcium mobilization in Wt CXCR4 but only partially inhibited these responses in Delta Cyto CXCR4. cAMP also partially inhibited these responses in both Wt CXCR4 and Delta Cyto CXCR4. SDF-1, PMA, and cAMP caused phosphorylation of phospholipase Cbeta 3 in Wt and Delta Cyto CXCR4 cells. Both SDF-1 as well as PMA induced rapid internalization of Wt CXCR4. SDF-1 but not PMA induced internalization of Delta Cyto CXCR4 albeit at reduced levels relative to Wt CXCR4. These results indicate that signaling and internalization of CXCR4 are regulated by receptor phosphorylation dependent and independent mechanisms. Desensitization of CXCR4 signaling, independent of receptor phosphorylation, appears to be a consequence of the phosphorylation of phospholipase Cbeta 3.


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