Abstract
Agents formerly shown to induce rapid macrophage spreading were examined for their ability to modify the migration of macrophages in the capillary tube assay. Products of the activation of the contact phase of blood coagulation as well as the purified component Bb, the large cleavage fragment of factor B of the alternative complement pathway produced a dose-dependent inhibition of migration. In addition, inflammatory macrophages elicited with either a lipopolysaccharide endotoxin or thioglycollate medium exhibited rapid spreading and inhibited migration, whereas resident cells did not. A close correlation existed, therefore, between enhanced spreading and inhibited migration under both in vitro induced and in vivo situations. Cleavage products of component C5 of the classical complement pathway enhanced macrophage migration and did not alter spreading. In mixtures of C5 cleavage products and Bb, the predominant peptide determined the outcome of the reaction. Factor B, a normal secretory product of macrophages, may represent a common substrate for several of the proteases that induce spreading, inhibit migration, and lead to the generation of the enzymatically active fragment Bb.
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