Higher levels of B‐cell mutation in the early germinal centres of an inefficient secondary antibody response to a variant influenza haemagglutinin. Issue 1 (11th March 2019)

• Record Type: Journal Article
• Authors: Tennant, Richard K.; Holzer, Barbara; Love, John; Tchilian, Elma; White, Harry N.
• Is Part Of: Immunology. Volume 157:Issue 1(2019)
• Page Start: 86
• Page End: 91
• Publication Date: 2019-03-11
• Subjects: affinity maturation -- antibodies -- B‐cell memory -- cross‐reactive -- influenza virus; Immunology -- Periodicals
• DOI: 10.1111/imm.13052
• Languages: English
• ISSNs: 0019-2805

Abstract

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. Abstract : Antibody memory and protective vaccine responses against variant virus proteins are poorly understood despite their importance to understanding viral disease epidemics. We have analysed the secondary antibody response to a variant influenza haemagglutinin and show that participation of highly mutated B cells in the germinal centres is associated with poor affinity maturation to the variant antigen. This provides a new focus for understanding the enhanced pathology often seen with secondary infections by variant viruses.