Abstract
Untreated SC (B2/B2) chicken spleen or thymus cells (2 × 10 7) caused significantly increased [ 3H]thymidine incorporation in spleens of heavily irradiated FP (B15/B21) recipient chicks on Day 4 after iv injection. Mitomycin-treated SC spleen cells or spleen cells treated with rabbit anti-T-cell serum and complement failed to raise the [ 3H]thymidine incorporation over that in uninjected, bursa cell-injected or FP spleen cell-injected controls. However, the combination of mitomycin-treated spleen or thymus cells and anti-T-treated spleen cells caused an increased [ 3H]thymidine uptake, suggesting the recruitment of non-T cells into proliferation by alloreactive mitomycin-treated T cells. Bursa cells did not proliferate during GVH reactions even though they could be shown to undergo proliferation in vivo upon mitogen (lipopolysaccharide and dextran sulfate) stimulation. In contrast, anti-T-treated spleen cells from agammaglobulinemic chickens were recruited into proliferation, suggesting that the recruited cell was not only not a T cell, but also no pre-B or B cell and most likely represented a cell of the monocyte-macrophage series.
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