title: Sheep red blood cells enhance T-lymphocyte proliferation.
abstract: Small numbers of sheep red blood cells (SRBC) markedly augmented the proliferation of T lymphocytes activated by antigens or mitogens. This effect occurred with as few as one SRBC per T lymphocyte and with intact or osmotically lysed red cells. When increasing numbers of SRBC was added to T lymphocyte cultures stimulated with PHA or autologous cells, T lymphocyte proliferation peaked sharply at 10 to 50 SRBC per T cell. The SRBC did not influence resting T-lymphocytes. Rather, the effect occurred after T lymphocyte activation during cell division. There was a detectable increase in interleukin 2 (IL-2) receptor generation but not in IL-2 production by activated T lymphocytes cultured with SRBC versus medium alone. Finally, anti-T11 antibody could inhibit the SRBC enhancing effect on T-lymphocyte function, suggesting that an empty erythrocyte (E) receptor on the T lymphocyte was necessary for the SRBC action.
mesh_terms: D000818:Animals; D004912:Erythrocytes / Q000502:physiology* / Q000648:ultrastructure; D006801:Humans; D007376:Interleukin-2 / Q000378:metabolism; D008213:Lymphocyte Activation; D011955:Receptors, Drug / Q000502:physiology; D012397:Rosette Formation; D012756:Sheep / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D007376:Interleukin-2; D011955:Receptors, Drug