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Proc Natl Acad Sci U S A. 1991 Nov 01;88(21):9528-32. doi: 10.1073/pnas.88.21.9528.

Cross-reactions and specificities of monoclonal antibodies against myelin basic protein and against the synthetic copolymer 1.

Proceedings of the National Academy of Sciences of the United States of America

D Teitelbaum, R Aharoni, M Sela, R Arnon

Affiliations

  1. Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel.

PMID: 1719533 PMCID: PMC52751 DOI: 10.1073/pnas.88.21.9528
Free PMC Article

Abstract

Antibody cross-reactivity is here demonstrated between basic protein (BP), the encephalitogenic molecule of myelin, and copolymer 1 (Cop 1), the synthetic amino acid copolymer, which has a suppressive effect on experimental allergic encephalomyelitis and is effective in reducing the number of relapses in exacerbating-remitting multiple sclerosis. This cross-reactivity is conclusively established using mouse monoclonal antibodies (mAbs). About a third of anti-rat BP mAbs and most of anti-mouse BP mAbs cross-reacted with Cop 1. This cross-reactivity could be demonstrated with anti-BP mAbs of different specificities. In addition, several anti-Cop 1 hybridomas cross-reacted with BP. This cross-reactivity was verified in several assay systems, including competitive inhibition experiments. Moreover, some anti-BP mAbs and anti-Cop 1 mAbs reacted in a heteroclitic manner and favored the cross-reactive antigen over the immunogen. In contrast to the mAbs, no cross-reactivity could be demonstrated with the antisera of immunized mice. This observation may reflect the different B-cell populations expressed in the mAb response as compared to the polyclonal response. Thus, the use of mAbs has uncovered specificities that are not evident in antisera and has revealed pronounced cross-reactivity between BP and Cop 1 at the B-cell level. These results further establish the immunological interrelationships between Cop 1 and BP, demonstrated earlier at the T-cell level.

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