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J. Exp. Med.,
Volume 188, Number 8, October 19, 1998 1413-1419
By
§




From the * Department of Medicine, the Leukocyte migration into sites of inflammation involves multiple molecular interactions between leukocytes and vascular endothelial cells, mediating sequential leukocyte capture, rolling, and firm adhesion. In this study, we tested the role of molecular interactions between fractalkine (FKN), a transmembrane mucin-chemokine hybrid molecule expressed on activated
endothelium, and its receptor (CX3CR1) in leukocyte capture, firm adhesion, and activation
under physiologic flow conditions. Immobilized FKN fusion proteins captured resting peripheral
blood mononuclear cells at physiologic wall shear stresses and induced firm adhesion of resting
monocytes, resting and interleukin (IL)-2-activated CD8+ T lymphocytes and IL-2-activated
NK cells. FKN also induced cell shape change in firmly adherent monocytes and IL-2-activated lymphocytes. CX3CR1-transfected K562 cells, but not control K562 cells, firmly adhered
to FKN-expressing ECV-304 cells (ECV-FKN) and tumor necrosis factor
Department of Immunology, and the § Department of
Pediatrics, Duke University Medical Center, Durham, North Carolina 27710; and the
Shionogi
Institute for Medical Science, Settsu 566, Japan
-activated human
umbilical vein endothelial cells. This firm adhesion was not inhibited by pertussis toxin,
EDTA/EGTA, or antiintegrin antibodies, indicating that the firm adhesion was integrin independent. In summary, FKN mediated the rapid capture, integrin-independent firm adhesion,
and activation of circulating leukocytes under flow. Thus, FKN and CX3CR1 mediate a novel
pathway for leukocyte trafficking.
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