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Laboratories of
*
Host Defenses and
Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
CC chemokine receptors 1 and 3 (CCR1 and CCR3) are expressed by
eosinophils; however, factors regulating their expression and function
have not previously been defined. Here we analyze chemokine receptor
expression and function during eosinophil differentiation, using the
eosinophilic cell line HL-60 clone 15 as a model system. RNA for CCR1,
-3, -4, and -5 was not detectable in the parental cells, and the cells
did not specifically bind CC chemokines. Cells treated with butyric
acid acquired eosinophil characteristics; expressed mRNA for CCR1 and
CCR3, but not for CCR4 or CCR5; acquired specific binding sites for
macrophage-inflammatory protein-1
and eotaxin (the selective
ligands for CCR1 and CCR3, respectively); and exhibited specific
calcium flux and chemotaxis responses to macrophage-inflammatory
protein-1
, eotaxin, and other known CCR1 and CCR3 agonists. CCR3 was
expressed later and at lower levels than CCR1 and could be further
induced by IL-5, whereas IL-5 had little or no effect on CCR1
expression. Consistent with the HIV-1 coreceptor activity of CCR3,
HL-60 clone 15 cells induced with butyric acid and IL-5 fused with HeLa
cells expressing CCR3-tropic HIV-1 envelope glycoproteins, and
fusion was blocked specifically by eotaxin or an anti-CCR3
mAb. These data suggest that CCR1 and CCR3 are markers of late
eosinophil differentiation that are differentially regulated by IL-5 in
this model.
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