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The Journal of Immunology, Vol 142, Issue 9 3180-3186, Copyright © 1989 by American Association of Immunologists

ARTICLES

IgE-dependent regulation of human basophil adherence to vascular endothelium

BS Bochner, DW MacGlashan Jr, GV Marcotte and RP Schleimer
Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21239.

Mechanisms favoring the recruitment of circulating human basophils to extravascular sites of allergic inflammation are unknown. The basophil secretagogues anti-IgE, and pollen allergens rye grass I and ragweed Ag E (Lol p I and Amb a I) were tested for their ability to promote basophil adherence to umbilical vein endothelial cells. Co-incubation of endothelial cells and basophils with anti-IgE resulted in time and dose-dependent increases in basophil adhesion. These effects were due to activation of the basophil, required both magnesium and calcium, occurred before or in the absence of histamine release, and were seen at concentrations of stimulus below the usual range of secretagogue activity. In contrast, anti-IgE or Ag stimulation of neutrophils, or basophils from donors non-responsive to anti-IgE or Ag with respect to histamine release, had no effect on cell adherence. mAb 60.3, recognizing the CD18 leukocyte adhesion molecule, inhibited anti-IgE- induced enhancement of basophil-endothelial cell binding. Exposure of basophils to low concentrations of Ag in vivo may selectively initiate basophil infiltration into tissue sites of allergic inflammation by enhancing their adherence to endothelium.


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