Abstract
The effect of immunological function of GD3 on normal bovine lymphocyte was examined with various in vitro assay systems. The GD3 level in sera from enzootic bovine leukemia (EBL) cattle was significantly increased compared with that of normal cattle (EBL: 0.62±0.24μg/ml; normal cattle: 0.33±0.09μg/ml, P<0.05). Lymphocyte blastogenesis elicited by concanavalin A was inhibited by addition of a 50μg/ml concentration, or more, of GD3. Inhibitory effect of GD3 in IL-2-dependent T cell line and EBL tumor cell line was hardly observed compared with normal peripheral blood mononuclear cells. GD3 also inhibited mixed lymphocyte reaction and allo cytotoxic T lymphocyte reaction.
