title: IFN gamma and IL-4 production by CD4, CD8 and WC1 gamma delta TCR(+) T cells from cattle lymph nodes and blood.
abstract: The synthesis of IFN gamma and IL-4 by CD4, CD8 and WC1 gamma delta TCR(+) T cell sub-populations, and T cells stained with activation/memory-sub-set markers has been examined by flow cytometric analysis. Cells from blood, prescapular, bronchial and mesenteric lymph nodes and Peyer's patches were incubated with phorbol 12-myristate 13-acetate (PMA), ionomycin and brefeldin-A before staining. Lymphocytes that stained for cytoplasmic IFN gamma were evident within the CD4 and CD8 populations from all tissues and also in the WC1 population from lymph nodes. IL-4 producing cells were primarily evident within the CD4 population. IFN gamma synthesis was evident within both CD45RO(+) and CD45RB(+) populations, but IL-4 synthesis was predominantly by cells that were CD45RO(+)/CD45RB(-). Expression of CD62L is not related to functional memory in CD4(+) T cells from cattle and CD62L(+) cells, particularly from the lymph nodes draining the skin and the lungs, stained with mAb to IFN gamma and IL-4. The findings indicate that at least for CD4(+) T cells, where CD45 isoform expression is related to functional memory, these two cytokines are produced predominantly by cells with a memory phenotype. The observation that some WC1(+) cells produce IFN gamma implies the presence of distinct sub-sets of this gamma delta TCR(+) population cattle and suggests a functional role.
authors.affiliation: Compton Laboratory, Department of Immunology and Pathology, Institute for Animal Health, Compton, Newbury RG20 7NN, UK.
authors.forename: P
authors.initials: P
authors.lastname: Sopp
authors.forename: C J
authors.initials: CJ
authors.lastname: Howard
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000378:metabolism*; D018414:CD8-Positive T-Lymphocytes / Q000378:metabolism*; D002417:Cattle; D007156:Immunologic Memory; D007371:Interferon-gamma / Q000096:biosynthesis*; D015847:Interleukin-4 / Q000096:biosynthesis*; D019041:L-Selectin / Q000032:analysis; D017493:Leukocyte Common Antigens / Q000032:analysis; D008198:Lymph Nodes / Q000378:metabolism*; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000032:analysis*; D016176:T-Lymphocyte Subsets / Q000378:metabolism
chemical_list: D016692:Receptors, Antigen, T-Cell, gamma-delta; D019041:L-Selectin; D015847:Interleukin-4; D007371:Interferon-gamma; D017493:Leukocyte Common Antigens