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We have recently demonstrated that tetanus toxin (TT) selectively inhibited gamma interferon-(IFN-gamma)-induced, but not basal, lysozyme activity in the GG2EE macrophage cell line. By an indirect immunofluorescence technique, we show that tetanus toxin, as well as the BIIb tetanus toxin-derived fragment, selectively binds to IFN-gamma-treated cells but fails to bind to control cells. Moreover, BIIb fragment and TT share the same binding sites, as demonstrated by competition/displacement experiments. These data indicate that IFN-gamma pretreatment results in the acquisition of tetanus toxin binding sites on GG2EE cells by a mechanism(s) yet to be identified.
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