Effects of recombinant granulocyte-macrophage colony-stimulating factor on bovine peripheral blood and mammary gland neutrophil function in vitro.
Modulation of peripheral blood and mammary gland neutrophil function following in vitro exposure to recombinant bovine granulocyte-macrophage colony-stimulating factor (rBoGM-CSF) was studied. Bovine blood and mammary gland neutrophils were cultured for 9 h in media containing 0.005, 0.05 or 0.5 microgram/mL rBoGM-CSF. Neutrophils treated with rBoGM-CSF exhibited significantly more chemotactic and bactericidal activities and tended to produce more superoxide anion than control cells. The effects of rBoGM-CSF on bovine neutrophil populations appeared to be dose-dependent. The production of superoxide anion and the bactericidal activity of mammary gland neutrophils were consistently higher than blood neutrophils. Only moderate increases in lipopolysaccharide-induced mammary gland neutrophil functions were observed following incubation with rBoGM-CSF which suggests that there may be a threshold of immunomodulation for these prestimulated cells. It may be possible to augment the functional capacity of bovine neutrophil populations in vivo through the therapeutic application of rBoGM-CSF and consequently enhance resistance of dairy cattle to bacterial infections.
Sordillo
L M
LM
Veterinary Infectious Disease Organization, University of Saskatchewan, Saskatoon.
Afseth
G
G
Davies
G
G
Babiuk
L A
LA
D000818:Animals; D002417:Cattle / Q000276:immunology*; D002478:Cells, Cultured; D002634:Chemotaxis, Leukocyte / Q000187:drug effects; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D007111:Immunity, Cellular / Q000187:drug effects; D008321:Mammary Glands, Animal / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D008414:Mastitis, Bovine / Q000517:prevention & control; D009504:Neutrophils / Q000187:drug effects* / Q000276:immunology; D009580:Nitroblue Tetrazolium / Q000378:metabolism; D010084:Oxidation-Reduction; D010587:Phagocytosis / Q000187:drug effects; D011994:Recombinant Proteins / Q000494:pharmacology; D013481:Superoxides / Q000378:metabolism
D011994:Recombinant Proteins; D013481:Superoxides; D009580:Nitroblue Tetrazolium; D016178:Granulocyte-Macrophage Colony-Stimulating Factor