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The Journal of Immunology, Vol 149, Issue 10 3260-3272, Copyright © 1992 by American Association of Immunologists
ARTICLES |
MA Newman, CR Mainhart, CP Mallett, TB Lavoie and SJ Smith-Gill
Laboratory of Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.
We tested 49 BALB/c antilysozyme mAb from seven intervals during the immune response to lysozyme for patterns of specificity and avidity. We found that the antibody epitopes in composite covered at least 80% of the lysozyme surface, and their patterns of overlap suggest a continuum of potential antibody epitopes. Previously observed regional specificities, which emerged at different times in the immune response, were more discretely defined in late response antibodies, when the majority of mAb could be assigned to one of three functionally nonoverlapping complementation groups. The area covered by each antigenic region may be greater than an individual epitope, and may include multiple epitopes that overlap structurally and functionally to varying degrees. Connectivity between antigenic regions was seen in interactions among early and late stage antibodies, and among secondary stage mAb, but not among tertiary stage mAb from hyperimmunized mice. Patterns of overlap of early and late response antibodies suggest that the organization of antibody specificities change during the progression from primary to secondary to tertiary response. Over the same period in the response, the average relative avidity of IgG1 kappa mAb did not increase, suggesting that "affinity maturation" of serum antibodies reflects an increase in the number and diversity of antibodies, rather than an overall increase in the avidity of individual antibodies.
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