title: Polymorphonuclear leukocyte-inhibitory factor of Bordetella pertussis. I. Extraction and partial purification of phagocytosis- and chemotaxis-inhibitory activities.
abstract: A new factor that inhibited phagocytosis to opsonized targets and chemotaxis of PMN was extracted from B. pertussis cells, and named PMN-inhibitory factor (PIF). Cells in phase I produced 10 times more PIF than those in phase III, and like other phase I-associated components--the hemagglutinin, the histamine-sensitizing factor and agglutinogens--PIF showed degenerative, phenotypic variation during in vitro culture of phase I bacteria. PIF was partially purified by four steps, including adsorption chromatography on Dansyl-aminononamethylene Sepharose. The resulting fraction was heterogeneous but showed little histamine-sensitizing and cytotoxic activities and was free from LPS, the hemagglutinin and a leukocyte agglutinin. The inherent resistance of B. pertussis cells, in either phase I or III, as demonstrated also in the present study, and PIF-mediated defiance against immunological defense mechanism may constitute a complex host-parasite relation in experimental infections with B. pertussis.
mesh_terms: D001886:Bordetella pertussis / Q000032:analysis* / Q000254:growth & development / Q000378:metabolism; D002634:Chemotaxis, Leukocyte; D006801:Humans; D008222:Lymphokines / Q000096:biosynthesis / Q000302:isolation & purification* / Q000494:pharmacology; D009504:Neutrophils; D010587:Phagocytosis
chemical_list: D008222:Lymphokines