Abstract
Antigen-specific suppressor T-cell hybridomas release soluble suppressor factors (TsF) in the supernatant that modulate both in vivo delayed-type hypersensitivity and in vitro plaque-forming cell responses in an antigen-specific manner. To study the relationship between the T-cell receptor (TcR) and TsF, we developed a series of TcR alpha- or TcR beta- expression variants from suppressor T-cell hybridomas that expressed the CD3-TcR alpha/beta complex. We demonstrate that loss of TcR alpha but not TcR beta mRNA was accompanied by the concomitant loss of suppressor bioactivity. Homologous transfection of TcR alpha cDNA into a TcR alpha- beta+ clone reconstituted both CD3-TcR expression and suppressor function. Furthermore, suppressor activity from TcR beta- variants was specifically absorbed by antigen and anti-TcR alpha antibodies, but not by anti-CD3 or anti-TcR beta affinity columns. These data directly establish a role for the TcR alpha chain in suppressor T-cell function and suggest that the TcR alpha chain is part of the antigen-specific TsF molecule.
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