Monoclonal anti-idiotype induces protection against the cytotoxicity of the trichothecene mycotoxin T-2.
An IgG1 mAb, designated HD11, specific for the trichothecene mycotoxin T-2 and capable of neutralizing its cytotoxicity was used to generate a syngeneic monoclonal anti-Id antibody. The generated anti-Id mAb, designated DE8, specifically bound to HD11 anti-T-2 mAb, and not to IgG1 mAb of irrelevant specificity or to normal mouse Ig. DE8 inhibited the binding of HD11 anti-T-2 to T-2-BSA-coated plates, whereas a control anti-Id mAb did not, suggesting recognition of an Id determinant associated with the T-2 binding site of HD11. Moreover, the binding of HD11 to DE8 and that of DE8 to HD11 were specifically inhibited by free T-2 mycotoxin. DE8 mAb was efficient in abrogating the protective effect of HD11 in the cytotoxicity of T-2 on the human epidermoid carcinoma cell line Hep-2. In vivo immunization of BALB/c mice with DE8 conjugated to KLH induced an anti-T-2 antibody titer comparable to that obtained with T-2-OVA immunization, whereas immunization with unconjugated DE8 resulted in a lower titered anti-T-2 response. Immunization with DE8-keyhole limpet or with unconjugated DE8 induced anti-T-2 antibody responses characterized by expression of "HD11-like" Id and by protection against T-2 cytotoxicity. However, the T-2-OVA-induced anti-T-2 response lacked the HD11+ Id and was only partially protective against T-2 cytotoxicity. This represents the first demonstration of the use of an anti-Id based vaccine in the in vivo induction of a protective antibody response against the cytotoxicity of a nonproteinaceous, small m.w. biologic toxin, whose very toxic nature precludes its use as the immunogen.
Chanh
T C
TC
Department of Virology and Immunology, Southwest Foundation for Biomedical Research, San Antonio, TX 78284.
Rappocciolo
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Hewetson
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JF
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology*; D000911:Antibodies, Monoclonal / Q000276:immunology*; D007114:Immunization; D007130:Immunoglobulin Idiotypes / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D012717:Sesquiterpenes / Q000276:immunology*; D013605:T-2 Toxin / Q000037:antagonists & inhibitors / Q000276:immunology*
D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D007130:Immunoglobulin Idiotypes; D012717:Sesquiterpenes; D013605:T-2 Toxin