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*
Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892; and
Division of Infectious Diseases, Georgetown University, Washington, DC 20057
The chemokine receptors CXCR4 and CCR5 have been identified as major coreceptors for HIV-1 entry into CD4+ T cells. The majority of primary HIV-1 isolates in early disease use CCR5 as a coreceptor, whereas during disease progression with the emergence of syncytium-inducing viruses, CXCR4 is also used. We performed a cross-sectional study in which we evaluated the expression of two HIV-1 coreceptors, CCR5 and CXCR4, in whole blood samples taken from HIV-1-infected and uninfected individuals. We demonstrate that CXCR4 on CD4+ and CD8+ T cells, and CD14+ monocytes is significantly down-regulated, and CCR5 expression on CD4+ T cells is up-regulated in HIV-infected individuals compared with uninfected controls. Coreceptor expression correlated with the level of cellular activation in vivo in both HIV-infected and uninfected individuals, with CXCR4 being expressed predominantly on quiescent (HLA-DR-) T cells and CCR5 being expressed predominantly on activated (HLA-DR+) T cells. Lower expression of CXCR4 and higher expression of CCR5 on CD4+ T cells correlated with advancing disease. In addition, a tendency for greater activation of CXCR4+CD4+ T cells in patients with advanced disease was observed. Patients who harbored syncytium-inducing viruses, however, could not be distinguished from those who harbored nonsyncytium-inducing viruses based on the level of CD4+ T cell activation or chemokine receptor expression.
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