Abstract
T-cell derived suppressor factor(s) (SF) specific for azobenzenearsonate (ABA) were prepared by the mechanical disruption of suppressor cells. Such suppressor factors were adsorbed to and recovered from immunoadsorbents prepared from the F(ab')2 fragments of rabbit immunoglobulin directed against the cross-reactive idiotype of A/J anti-ABA antibodies. These ABA-suppressor factors were not retained on Sepharose 4B immunoadsorbent columns which had been coupled with F(ab')2 fragments or normal rabbit immunoglobulins prepared from prebleeds of rabbits used to make anti-idiotypic antiserum. The specificity of the F(ab')2 rabbit anti-idiotypic serum was established by direct idiotypic-binding assays and by affinity purification over an immunoadsorbent consisting of CRI+ anti-ABA immunoglobulin from A/J mice. ABA-suppressor factors were shown to be specifically absorbed and eluted from F(ab')2 anti-idiotypic columns. Futhermore, the eluted suppressor factor can be specifically reabsorbed and recovered from a second anti-idiotypic immunoadsorbent. The concordance between antigen- binding specificity and the presence of idiotypic determinants was demonstrated by adsorbing ABA SF to antigen columns and then fractionating the ABA-specific factor on anti-idiotypic immunoadsorbents. ABA-suppressor factors were shown to be specifically retained on immunoadsorbents directed against major histocompatibility complex (MHC) determinants. Factor eluted from anti-MHC columns could then be specifically adsorbed to anti-idiotypic immunoadsorbents. This suggests that the same molecular complex that is recognized by the H-2 alloantiserum is specifically adsorbed to an anti-idiotypic immunoadsorbent. Genetic analysis of the expression of CRI+ suppressor factor was performed using the C.AL-20 mouse strain which has the AL/N allotype and produces CRI+ anti-ABA immunoglobulins. The implication of these findings to the nature of T-cell-derived regulatory molecules is discussed.
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Selected References
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