title: Expression of bioactive porcine interferon-gamma by recombinant Lactococcus lactis.
abstract: Lactococcus lactis is an immunomodulator and candidate live mucosal delivery vehicle for vaccine antigens and for biologically active molecules, including immunoregulatory cytokines such as interferon-gamma (IFN-gamma). To provide a tool for investigating downregulation of allergic predisposition of pigs to experimental food allergy, porcine IFN-gamma was cloned and expressed as a fusion protein with the usp45 secretion signal. Immunoblot analysis with polyclonal anti-pIFN-gamma-antibody demonstrated that the recombinant porcine IFN-gamma (rpIFN-gamma) protein was expressed in the L. lactis transformants as a secreted product. Activity of rpIFN-gamma was confirmed by ability to upregulate class II major histocompatibility complex (MHC) on cells of the porcine monocytic cell line 3D4/31. The L. lactis producing biologically active rpIFN-gamma will be used to investigate its possible ability to modulate the allergic immune response phenotype of pigs.
authors.affiliation: Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
authors.forename: Prithy
authors.initials: P
authors.lastname: Rupa
authors.forename: Vicente
authors.initials: V
authors.lastname: Monedero
authors.forename: Bruce N
authors.initials: BN
authors.lastname: Wilkie
mesh_terms: D000818:Animals; D002460:Cell Line; D004797:Enzyme-Linked Immunosorbent Assay; D005786:Gene Expression Regulation / Q000187:drug effects; D005802:Genes, MHC Class II / Q000502:physiology; D005818:Genetic Engineering; D007371:Interferon-gamma / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D013294:Lactococcus lactis / Q000235:genetics* / Q000378:metabolism*; D016676:Macrophages, Alveolar / Q000187:drug effects / Q000378:metabolism; D013552:Swine
chemical_list: D007371:Interferon-gamma