Abstract
Earlier, indirect evidence for rabbit subpopulations differing in Fc receptors and in response to mitogen has been directly tested. T cells were purified from spleen suspension by removal of adherent cells, followed by removal of Ig-bearing cells on petri dishes coated with antibody, directed against the light chain allotype of Ig receptors. The purified cells were further fractionated by formation of EA rosettes and separation on Ficoll-Hypaque. T cells which lacked Fc receptors had a larger response when stimulated with Con A or PHA than did T cells which possessed Fc receptors. Both subpopulations responded more when irradiated nonadherent B cells were added to the mixture, but the extent of help was the same for both cell populations. T cells which contained both Fc receptor-bearing cells and cells which lacked the receptor had a response which was intermediate between that of the two separated subpopulations.
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