title: Bovine interleukin-12 and modulation of IFNgamma production.
abstract: The effects of IL-12 on the responses of cattle peripheral blood mononuclear cells (PBMC) to bovine respiratory syncytial virus (BRSV) antigen and ovalbumin (OVA) were tested, in vitro. IL-12 did not affect the proliferative responses of PBMC to these antigens but markedly accelerated and augmented the level of IFNgamma secreted. When tested on lymphoblasts rather than resting T-cells IL-12 also enhanced proliferation. In contrast IL-4 and, to greater extent, IL-10 inhibited the response. The effect of IL-12 on IFNgamma synthesis was confirmed at the level of IFNgamma. mRNA expression using Taqman PCR. CD4 and CD8 T-cell populations produced IFNgamma, however, CD4 T-cells comprised the largest contributors to the IFNgamma production. Gamma/delta T-cells did not contribute markedly. A comparison of the species cross-reactivity showed bovine IL-12 was also active in the human system. This study shows that antigen-driven responses in cattle can be significantly influenced by exogenous cytokines and suggests the IL-12/IL-10 balance is crucial for regulation of IFNgamma.
authors.affiliation: Division of Immunology and Pathology, Institute for Animal Health, Newbury, Berkshire, UK. collinsr@bbsrc.ac.uk
authors.forename: R A
authors.initials: RA
authors.lastname: Collins
authors.forename: C J
authors.initials: CJ
authors.lastname: Howard
authors.forename: S E
authors.initials: SE
authors.lastname: Duggan
authors.forename: D
authors.initials: D
authors.lastname: Werling
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects* / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000187:drug effects* / Q000276:immunology; D002417:Cattle; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis* / Q000235:genetics; D016753:Interleukin-10 / Q000494:pharmacology; D018664:Interleukin-12 / Q000494:pharmacology*; D015847:Interleukin-4 / Q000494:pharmacology; D008213:Lymphocyte Activation / Q000187:drug effects / Q000276:immunology; D051379:Mice; D010047:Ovalbumin; D016133:Polymerase Chain Reaction / Q000662:veterinary; D012333:RNA, Messenger / Q000378:metabolism; D018112:Respiratory Syncytial Virus, Bovine; D013045:Species Specificity
chemical_list: D012333:RNA, Messenger; D016753:Interleukin-10; D018664:Interleukin-12; D015847:Interleukin-4; D007371:Interferon-gamma; D010047:Ovalbumin