Journal of Leukocyte Biology, Vol 51, Issue 2 103-108, Copyright © 1992 by Society for Leukocyte Biology
JOURNAL ARTICLE |
M Gaudry, AC Caon, C Gilbert, S Lille and PH Naccache
Centre de Recherche en Inflammation et Immunologie-Rhumatologie, CHUL, Ste Foy, Quebec, Canada.
Erbstatin, a recently described inhibitor of tyrosine kinases, has been used to examine the potential role of tyrosine phosphorylation in human neutrophil locomotion. Preincubation of human neutrophils with erbstatin inhibited both spontaneous and directed migration induced by chemotactic factors such as formylmethionylleucylphenylalanine (fMet-Leu-Phe) and leukotriene B4. The decreased migratory responses were correlated with an inhibition of adherence of neutrophils to serum-coated surfaces. Erbstatin did not, however, affect the adherence of human neutrophils to uncoated surfaces. These results indicated that the inhibitory effects of erbstatin were specific and not due to a generalized alteration of the surface of human neutrophils. To elucidate the mechanism of the inhibitory effect of erbstatin on adherence properties, the expression of the leukocyte integrin Mo1 was studied. Erbstatin induced a small but significant increase in the expression of Mo1, but decreased the stimulation of the expression of Mo1 elicited by fMet-Leu-Phe. These results suggest that mechanisms in addition to alteration of the number of surface integrins are involved in the inhibition of neutrophil adherence and locomotion by erbstatin.
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