Inhibition of Polymorphonuclear Leukocyte Capping by A Chemotactic Factor

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Abstract
Incubation of human polymorphonuclear leukocytes with colchicine and fluorescein-concanavalin A leads to the formation of a polarized cap of fluorescence not seen if cells are incubated with fluorescein-Con A alone. When cells are preincubated with a chemotactic factor before colchicine treatment, the capping is inhibited in a dose-related manner. Studies with α-methylmannoside indicate that the caps represent extracellular fluorescein-Con A and are not areas of Con A internalization. Experiments utilizing an irreversible inhibitor of serine esterases suggest that a chemotactic factor-activated enzyme is involved in the inhibition of cap formation in the human neutrophil.