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The immune response to a synthetic peptide, H3 HA1(305-328), representing the C'-terminal 24 amino acid residues of the HA1 chain of the hemagglutinin of the H3 subtype of influenza virus is controlled by genes in the I region of the major histocompatibility complex. Mice of the H-2d haplotype are high responders and produce antibody for several months after a single injection of peptide without carrier. Mice of the H-2b, H-2k, and H-2q haplotypes are low antibody responders. Investigation of recombinant and congenic mouse strains revealed that high responsiveness requires the genes that encode the I-Ed molecule. Immunoassays, involving direct binding to analogs of this peptide and inhibition by both these analogs and synthetic epitopes, were used to analyze the specificity of the polyclonal response. In BALB/c mice, the primary antibody response is directed principally against the antigenic site 314-LKLAT-318, whereas the secondary response after a boost is predominantly directed to a distinct site, 320-MRNVPEKQT-328. The T-cell response to the peptide H3 HA1(305-328), as measured by antigen-induced proliferation of primed T cells in vitro, is also I-Ed restricted in high-responder H-2d mice and is directed against an antigenic site that does not require the four C-terminal residues unique to the H3 influenza subtype. A different epitope appears to be recognized by T cells from CBA (H-2k) mice, which proliferate to a moderate extent on exposure to the peptide but, nevertheless, do not provide help for an antibody response.

Genetic control and fine specificity of the immune response to a synthetic peptide of influenza virus hemagglutinin