Defining B cell immunodominance to viruses

Area of Science:

• Immunology
• Virology
• Vaccinology

Background:

• Immunodominance (ID) describes the hierarchical immune response to multiple antigens.
• B cell and antibody ID are crucial for immunity to pathogens but remain poorly understood.
• The influenza A virus hemagglutinin (HA) presents a complex immunogen with multiple antigenic sites.

Purpose of the Study:

• To investigate B cell and antibody immunodominance hierarchies against the influenza A virus hemagglutinin globular domain.
• To characterize the dynamics of antibody ID during an evolving immune response.
• To explore the phenomenon of original antigenic suppression.

Main Methods:

• Utilized inbred mice to study immune responses to influenza A virus HA.
• Analyzed B cell and serum antibody hierarchies against five major HA antigenic sites.
• Employed passive antibody transfer and sequential infection models.
• Investigated the impact of antigen formulation and delivery on ID.

Main Results:

• Established a reproducible immunodominance hierarchy for B cells and antibodies against influenza HA antigenic sites.
• Observed that the antibody ID hierarchy is dynamic, changing with immune progression.
• Demonstrated that antigen formulation and delivery influence the observed hierarchy.
• Identified 'original antigenic suppression,' where antibodies inhibit memory responses to the initial antigenic site.

Conclusions:

• The study provides a framework for understanding antibody immunodominance in viral infections.
• Findings highlight the plasticity of antibody responses and the phenomenon of original antigenic suppression.
• Results have implications for designing more effective vaccines against influenza and other complex pathogens.
• Further research into antibody ID can enhance strategies for controlling viral diseases.