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. 1992 Feb;60(2):623–629. doi: 10.1128/iai.60.2.623-629.1992

Genetic control of immune responses in mice to synthetic peptides of a Streptococcus mutans surface protein antigen.

I Takahashi 1, K Matsushita 1, T Nisizawa 1, N Okahashi 1, M W Russell 1, Y Suzuki 1, E Munekata 1, T Koga 1
PMCID: PMC257675  PMID: 1370433

Abstract

The immune responses to a cell surface protein antigen (PAc) of Streptococcus mutans and a peptide corresponding to residues 301 to 319 of the protein antigen [PAc(301-319)] in various strains of mice were studied, with attention being given to the haplotype of major histocompatibility complex (MHC) class II genes. Subcutaneous immunization of mice carrying the MHC class II I-Ad gene [BALB/c, B10.D2, B10.GD, and (B10.D2 x B10.G)F1 mice] with the peptide induced strong serum immunoglobulin G (IgG) responses to recombinant PAc (rPAc) and the peptide. Subcutaneous immunization of mice carrying the haplotype k or b of the H-2 I-A gene (C3H/HeN, C57BL/6, B10.BR, B10.A, or B10 mice) with the peptide induced intermediate serum IgG responses to rPAc and the peptide, and subcutaneous immunization of mice carrying the haplotype s or q of the H-2 I-A gene (DBA/1, B10.S, or B10.G mice) induced weak serum IgG responses to rPAc and the peptide compared with the responses of mice carrying the I-Ad gene. PAc(301-319) strongly induced PAc(301-319)-specific T-cell proliferation in B10.D2 mice but not in B10.G mice. The T-cell proliferation in B10.D2 mice was inhibited by treatment of antigen-presenting cells with anti-I-Ad monoclonal antibody but not with anti-I-Ab monoclonal antibody. These results indicate that the immune responses to the peptide in mice are genetically restricted or dominated by the MHC class II gene (I-Ad). To map antigenic epitopes in PAc(301-319) and PAc in mice bearing different H-2 haplotypes, 10 overlapping decapeptides covering PAc(301-319) and 153 decapeptides covering the entire mature PAc were synthesized. Of 10 decapeptides covering PAc(301-319), 6, 7, 1, and 1 decapeptides showed strong reactions with anti-PAc(301-319) sera from B10.D2 (H-2d), B10.GD (H-2g2), B10.BR (H-2k), and B10.A (H-2a) mice, respectively. None of these overlapping decapeptides reacted with anti-PAc(301-319) sera from B10.S (H-2s) and B10.G (H-2q) mice. Epitope-scanning analyses of the mature PAc molecule showed that antigenic epitopes scattered throughout the molecule and that antigenic epitope patterns differed in mice with different H-2 haplotypes. In addition, there was little overlap of immunogenic peptides among the mice with different haplotypes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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