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The Journal of Immunology, 1999, 162: 1392-1400.
Copyright © 1999 by The American Association of Immunologists

cAMP Up-Regulates Cell Surface Expression of Lymphocyte CXCR4: Implications for Chemotaxis and HIV-1 Infection1

Steve W. Cole2,*, Beth D. Jamieson* and Jerome A. Zack*,{dagger}

* UCLA AIDS Institute, Department of Medicine, and {dagger} Department of Microbiology and Molecular Genetics, University of California at Los Angeles School of Medicine, Los Angeles, CA 90095

The chemokine receptor CXCR4 mediates lymphocyte chemotaxis in response to stromal cell-derived factor-1 (SDF-1) and functions as a coreceptor for T cell-tropic strains of HIV-1. We examined the role of the cAMP-protein kinase A (PKA) signaling pathway in regulating expression of CXCR4. In response to exogenous dibutyryl cAMP or cAMP-inducing ligands, cell surface expression of CXCR4 was increased by up to 10-fold on CD3/CD28-stimulated PBMC and by up to sixfold on unstimulated PBMC. cAMP did not alter receptor mRNA levels or affect the size of the total CXCR4 pool. However, cAMP did significantly reduce CXCR4 internalization rates and thereby increased the fraction of the total CXCR4 pool expressed on the cell surface. cAMP-induced increases in CXCR4 expression counteracted SDF-1-induced receptor internalization and enhanced both chemotactic response to SDF-1 and cellular vulnerability to HIV-1 infection. Thus, altered chemokine receptor expression may provide one mechanism by which cAMP-inducing ligands influence lymphocyte localization and HIV pathogenesis.




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