Abstract
Basophils have been shown to accumulate in allergic airways and other extravascular sites. Mechanisms responsible for the selective recruitment of basophils from the blood into tissue sites remain poorly characterized. In this study, we characterized human basophil rolling and adhesion on HUVECs under physiological shear flow conditions. Interestingly, treatment of endothelial cells with the basophil-specific cytokine IL-3 (0.01-10 ng/ml) promoted basophil and eosinophil, but not neutrophil, rolling and exclusively promoted basophil adhesion. Preincubation of HUVECs with an IL-3R-blocking Ab (CD123) before the addition of IL-3 inhibited basophil rolling and adhesion, implicating IL-3R activation on endothelial cells. Incubation of basophils with neuraminidase completely abolished both rolling and adhesion, indicating the involvement of sialylated structures in the process. Abs to the beta(1) integrins, CD49d and CD49e, as well as to P-selectin and P-selectin glycoprotein ligand 1, inhibited basophil rolling and adhesion. Furthermore, blocking chemokine receptors expressed by basophils, such as CCR2, CCR3, and CCR7, demonstrated that CCR7 was involved in the observed recruitment of basophils. These data provide novel insights in...Continue Reading
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