title: Activation of bovine neutrophils by recombinant interferon-gamma.
abstract: The effect of recombinant bovine interferon-gamma (r-IFN-gamma) on neutrophil functions was investigated and compared to the effects of an unpurified lymphokine preparation. Incubation of purified bovine neutrophils with r-IFN-gamma or antigen-induced lymphokine for 2.5 hr at 37 degrees C resulted in impairment of the ability of neutrophils to migrate under agarose, and an enhancement of their ability to mediate antibody-dependent and antibody-independent cell-mediated cytotoxicity against chicken erythrocytes. Neither the lymphokine preparation nor the r-IFN-gamma had any influence on Staphylococcus aureus ingestion, or iodination by neutrophils. The lymphokine preparation enhanced cytochrome c reduction by neutrophils and was weakly chemotactic, whereas the r-IFN-gamma had neither of these effects. Only 5 min of r-IFN-gamma preincubation with neutrophils were needed to trigger protein synthesis by the neutrophils resulting in inhibition of random migration. Therefore, recombinant interferon-gamma acts as a neutrophil migration inhibition factor and a neutrophil activation factor resulting in enhanced neutrophil-mediated antibody-dependent and -independent cell-mediated cytotoxicity. Many, but not all, of the in vitro effects of an unpurified lymphokine preparation on neutrophil function can be attributed to the interferon-gamma contained in the lymphokine.
mesh_terms: D000818:Animals; D002417:Cattle; D002634:Chemotaxis, Leukocyte / Q000187:drug effects; D002645:Chickens; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D004912:Erythrocytes / Q000378:metabolism; D007371:Interferon-gamma / Q000494:pharmacology*; D007700:Kinetics; D008715:Methionine / Q000378:metabolism; D009504:Neutrophils / Q000276:immunology* / Q000378:metabolism / Q000502:physiology; D010587:Phagocytosis / Q000187:drug effects; D012313:RNA / Q000096:biosynthesis; D011994:Recombinant Proteins / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000276:immunology
chemical_list: D011994:Recombinant Proteins; D012313:RNA; D007371:Interferon-gamma; D008715:Methionine