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J. Exp. Med.,
Volume 187, Number 3, February 2, 1998 439-444
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From the * Istituto di Ricerche Farmacologiche `Mario Negri', 20157 Milan, Italy; The immunosuppressive and antiinflammatory cytokine interleukin (IL) 10 selectively upregulates the expression of the CC chemokine receptors CCR5, 2, and 1 in human monocytes by
prolonging their mRNA half-life. IL-10-stimulated monocytes display an increased number of
cell surface receptors for, and better chemotactic responsiveness to, relevant agonists than do
control cells. In addition, IL-10-stimulated monocytes are more efficiently infected by HIV
BaL. This effect was associated to the enhancement of viral entry through CCR5. These data
add support to an emerging paradigm in which pro- and antiinflammatory molecules exert reciprocal and opposing influence on chemokine agonist production and receptor expression.
the AIDS
Immunopathogenesis Unit, San Raffaele Scientific Institute, 20132 Milan, Italy; § the Geneva
Biomedical Research Institute, Glaxo Wellcome Research and Development, Geneva, Switzerland;
the Section of Pathology and Immunology, Department of Biotechnology, University of Brescia,
25123 Brescia, Italy; and ¶ Millennium Biotherapeutics Inc., Cambridge, MA
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