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Higher levels of B‐cell mutation in the early germinal centres of an inefficient secondary antibody response to a variant influenza haemagglutinin
Author(s) -
Tennant Richard K.,
Holzer Barbara,
Love John,
Tchilian Elma,
White Harry N.
Publication year - 2019
Publication title -
immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.297
H-Index - 133
eISSN - 1365-2567
pISSN - 0019-2805
DOI - 10.1111/imm.13052
Subject(s) - memory b cell , germinal center , avidity , biology , original antigenic sin , antigen , virology , antibody , antibody response , adjuvant , b cell , virus , immunology , influenza a virus , antigenic drift
Summary Designing improved vaccines against mutable viruses such as dengue and influenza would be helped by a better understanding of how the B‐cell memory compartment responds to variant antigens. Towards this we have recently shown, after secondary immunization of mice with a widely variant dengue virus envelope protein with only 63% amino acid identity, that IgM + memory B cells with few mutations supported an efficient secondary germinal centre ( GC ) and serum response, superior to a primary response to the same protein. Here, further investigation of memory responses to variant proteins, using more closely related influenza virus haemagglutinins ( HA ) that were 82% identical, produced a variant‐induced boost response in the GC dominated by highly mutated B cells that failed, not efficiently improving serum avidity even in the presence of extra adjuvant, and that was worse than a primary response. This supports a hypothesis that over a certain level of antigenic differences, cross‐reactive memory B‐cell populations have reduced competency for affinity maturation. Combined with our previous observations, these findings also provide new parameters of success and failure in antibody memory responses.