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. 1987 Apr;60(4):531–538.

Monoclonal B-cell response to diphtheria toxoid: evidence for cross-reactive epitopes.

B Autran, F Triebel, M Viguier, M Jolivet, P Falmagne, P Debre
PMCID: PMC1453290  PMID: 2438207

Abstract

Our previous studies on the human specific B- and T-cell responses against diphtheria toxoid (DT) had shown that the B- and T-cell antigenic determinants were mostly assembled topographic sites with large intra-molecular cross-reactivities. In order to characterize further the B-cell responses against DT, and to investigate these cross-reactivities, we have produced 54 murine monoclonal antibodies (moAbs) against the native DT. Determination of their antigenic specificity showed that 25 moAbs recognized conformational determinants on the native DT, 20 moAbs reacted against the A fragment (DTA) of the toxin, and nine moAbs reacted with at least three distinct highly purified CNBr peptides of the B fragment (DTB); some of them simultaneously recognized two or three purified CNBr peptides of DTB. As shown by cross-inhibition studies, the epitopes cross-reacting with those moAbs were distinct. Previously described sequence data indicated that these epitopes were not induced by repetitive amino-acid sequences. Finally, a cross-reactive idiotype was shared by moAbs specific for the CB1 and the CB3 peptides of DTB. Altogether, these data indicate that anti-DT moAbs are mostly directed against conformational determinants, and may cross-react with several DTB CNBr peptides.

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Selected References

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