title: Lymphotoxin production by subsets of T cells.
abstract: Lymphotoxin is produced by T cells sensitized to antigen upon re-exposure in vitro. It is also elicited by mitogen treatment. Its production has been correlated with delayed-type hypersensitivity and it may be a mediator of that phenomenon. We have examined the Ly phenotype of the subset(s) of T cells that produce lymphotoxin in order to investigate the relationship of lymphotokin killing to allo-killing mediated by Ly2+ T cells. We have found that Ly1 T cells sensitized to ovalbumin secrete more lymphotoxin than Ly2 cells. The ovalbumin-sensitized T cells do not lyse their target in a short term 51Cr-release assay even when "glued" to the target with Con A. Thus, lymphotoxin-producing cells differ phenotypically from the previously defined cytotoxic T cells that bear the Ly2 differentiation marker.
mesh_terms: D000818:Animals; D000961:Antilymphocyte Serum / Q000494:pharmacology; D003208:Concanavalin A / Q000494:pharmacology; D003602:Cytotoxicity, Immunologic; D000939:Epitopes; D005260:Female; D006183:H-2 Antigens; D008233:Lymphotoxin-alpha / Q000096:biosynthesis*; D051379:Mice; D008810:Mice, Inbred C57BL; D010047:Ovalbumin / Q000276:immunology; D011817:Rabbits; D013601:T-Lymphocytes / Q000145:classification* / Q000378:metabolism
chemical_list: D000961:Antilymphocyte Serum; D000939:Epitopes; D006183:H-2 Antigens; D008233:Lymphotoxin-alpha; D003208:Concanavalin A; D010047:Ovalbumin