Interaction between T cells and non-T cells in suppression of cytotoxic lymphocyte responses.
J Immunol, 1979/8;123(2):745-50.
Truitt GA, Dennison DK, Rich RR, Rich SS
PMID: 156762
Impact factor: 5.426
Abstract
Generation of cytotoxic T lymphocytes (CTL) in mixed leukocyte cultures was suppressed by a factor elaborated by alloantigen-activated T cells. This suppressor factor, CTL-TsF, in contrast to a factor that suppresses proliferative responses in mixed leukocyte reactions (MLR-TsF), was effective only when added during the first 24 hr of a 6-day-culture period. Moreover, removal of CTL-TsF 24 hr after culture initiation failed to restore CTL responses. CTL activity could be rescued from suppressed cultures, however, by addition of 2-mercaptoethanol on days 3 or 4. Similarly, transfer of nonadherent cells at 3 or 4 days from cultures treated with CTL-TsF to cultures of adherent cells initiated in control factor restored CTL responses. Mixing experiments with cells pulsed with CTL-TsF for 4 hr at culture initiation identified a target of CTL-TsF as a Thy-1 negative cell that was adherent to plastic and to Sephadex G-10. Suppression was not due to interference with physiologic accessory cell function, but more likely was accomplished via a negative signal from CTL-TsF-pulsed cells. The results thus suggest that CTL-TsF acts early, but reversibly, in the CTL differentiative process via a second suppressor effector cell, possibly a macrophage.
MeSH terms
Animals; Antilymphocyte Serum; Cell Adhesion; Cell Communication; Cells, Cultured; Cytotoxicity, Immunologic; Immunosuppression Therapy; Lymphocyte Culture Test, Mixed; Male; Mice; Mice, Inbred BALB C; Mice, Inbred C57BL; Mice, Inbred CBA; Mice, Inbred DBA; Spleen; T-Lymphocytes; Time Factors
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