title: Activation of bovine peripheral blood gammadelta T cells for cell division and IFN-gamma production.
abstract: Bovine peripheral blood gammadelta T cells have been evaluated for effector function (IFN-gamma production) and clonal expansion in a variety of systems including following activation by mitogens, IL-12, and stimulation, through the T cell receptor (TCR) with anti-CD3 monoclonal antibody (mAb), a cell-bound molecule and a soluble antigenic extract. To evaluate cell division, carboxyfluorescein succinimidyl ester (CFSE) loading of cells and flow cytometric analysis were used, while IFN-gamma production was evaluated by intracytoplasmic staining. It was found that bovine gammadelta T cells produced IFN-gamma and clonally expanded when stimulated through the TCR/CD3 complex by a cell-associated autologous molecule on monocyte, by bacterial components following in vivo sensitization of gammadelta T cells with a leptospira vaccine or by anti-CD3 mAb. In addition, gammadelta T cells were activated efficiently for effector function but not clonal expansion by culturing with IL-12. In contrast, stimulation by Con A or PMA/ionomycin induced efficient replication but only low level IFN-gamma production which was not enhanced by the presence of IL-12. In several systems the amount of IFN-gamma produced per cell by gammadelta T cells was less than that produced by CD4 T cells in the same cultures.
authors.affiliation: Paige Laboratory, Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, USA. cbaldwin@vasci.umass.edu
authors.forename: C L
authors.initials: CL
authors.lastname: Baldwin
authors.forename: T
authors.initials: T
authors.lastname: Sathiyaseelan
authors.forename: B
authors.initials: B
authors.lastname: Naiman
authors.forename: A M
authors.initials: AM
authors.lastname: White
authors.forename: R
authors.initials: R
authors.lastname: Brown
authors.forename: S
authors.initials: S
authors.lastname: Blumerman
authors.forename: A
authors.initials: A
authors.lastname: Rogers
authors.forename: S J
authors.initials: SJ
authors.lastname: Black
mesh_terms: D000818:Animals; D017252:CD3 Complex / Q000276:immunology; D002417:Cattle; D002455:Cell Division; D007371:Interferon-gamma / Q000096:biosynthesis*; D018664:Interleukin-12 / Q000494:pharmacology; D015759:Ionomycin / Q000494:pharmacology; D008213:Lymphocyte Activation; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000032:analysis*; D016176:T-Lymphocyte Subsets / Q000276:immunology*
chemical_list: D017252:CD3 Complex; D016692:Receptors, Antigen, T-Cell, gamma-delta; D018664:Interleukin-12; D015759:Ionomycin; D007371:Interferon-gamma