Bovine natural cell mediated cytotoxicity (NCMC): activation by cytokines.
Incubation of bovine peripheral blood mononuclear leukocytes (PBML) with the cytokines (CK) IL-2, alpha-IFN, gamma-IFN or IL-4 resulted in significant increases in natural cell mediated cytotoxicity (NCMC) over endogenous levels, as determined in an 18 h 51Cr-release assay using the human K562 or mouse Yac-1 target cell lines. Endogenous cytotoxic activity of bovine natural effector cells (NEC) using K562 or Yac-1 target cells was minimal (killing less than 8%). After 18 h of incubation with the CK hurIL-2, alpha-bovrIFN, gamma-bovrIFN or hurIL-4, NEC had significant increases in cytotoxic activity for both K562 and Yac-1 target cells. Significant increases in cytotoxic activity were not found after incubation of NEC with IL-1 or beta-IFN. Specific killing varied with CK concentration in a dose dependent manner and was proportional to effector:target cell ratio. Activation of the bovine NEC by CK was rapid, occurring within 6-12 h of incubation with alpha-IFN or gamma-IFN and within 12-18 h of incubation with IL-2. Incubation of bovine PBML with IL-2 and alpha- or gamma-IFN or with alpha-IFN and gamma-IFN showed that these CK do not act in a synergistic manner to increase NCMC in the bovine NEC.
Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin, Madison 53706.
J
J
Jensen
R D
RD
Schultz
D000818:Animals; D001685:Biological Factors / Q000494:pharmacology*; D002417:Cattle / Q000276:immunology*; D016207:Cytokines; D003602:Cytotoxicity, Immunologic / Q000276:immunology*; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D014407:Tumor Cells, Cultured
D001685:Biological Factors; D016207:Cytokines