B Cell Immunology in Malaria Infection

B cells are central to the immune defence against malaria, mediating pathogen clearance through antibody production and contributing to long-term protection via memory responses. Following blood-stage infection, naïve B cells recognise parasite antigens and undergo activation in lymphoid tissues, forming germinal centres where they proliferate, undergo somatic hypermutation and differentiate into antibody-secreting plasma cells or memory B cells. However, repeated exposure to Plasmodium species often disrupts this process, leading to the expansion of atypical memory B cells with altered receptor signalling and diminished effector function. As a result, high-affinity antibodies may be slow to develop or short-lived in endemic populations, undermining durable immunity. Current research highlights the balance between antibody breadth and avidity, the role of regulatory B cell subsets in modulating inflammation, and the critical support provided by T follicular helper cells. Understanding the mechanisms behind B cell subset dynamics, antibody maturation and memory maintenance is essential for designing next-generation vaccines and immunotherapies that elicit robust, long-lived protection against diverse Plasmodium antigens across varied transmission settings.

Research from Nature Portfolio

Recent studies have elucidated how chronic malaria exposure shapes B cell homeostasis. In high-transmission regions, individuals accumulate atypical memory B cells that correlate positively with the diversity of antigen-specific antibodies but negatively with antibody strength. Although repeated infections impair the development of high-avidity antibodies, an expanded antibody repertoire appears to compensate by targeting a broader range of merozoite antigens. Functional assays demonstrate that in vitro parasite growth inhibition is more closely linked to antibody breadth than to binding to free merozoites, suggesting that vaccine strategies should aim to elicit diverse antibody specificities alongside quality-enhancing maturation processes.

B Cell Immunology in Malaria Infection publication trend

The graph below shows the total number of articles in b cell immunology in malaria infection across all publications each year (not limited to Nature Index journals).

Technical terms

Atypical memory B cell: A subset of memory B cells characterised by altered surface markers and reduced B cell receptor signalling, often expanded during chronic malaria exposure.

Germinal centre: Specialized structures within lymphoid organs where B cells proliferate, undergo somatic hypermutation and differentiate into plasma cells or memory B cells.

Antibody avidity: The overall strength with which a multivalent antibody binds to its antigen, reflecting affinity maturation.

Antibody breadth: The range of distinct antigenic variants or epitopes recognised by an individual’s antibody repertoire.

T follicular helper cell (Tfh cell): A subset of CD4+ T cells that provides essential signals for B cell activation, germinal centre formation and affinity maturation.

References

1. Current understanding of the immune potential of B-cell subsets in malarial pathogenesis. Frontiers in Microbiology (2023).
2. Atypical memory B cell frequency correlates with antibody breadth and function in malaria immune adults. Scientific Reports (2024).
3. Malaria-associated atypical memory B cells exhibit markedly reduced B cell receptor signaling and effector function. eLife (2015).
4. T follicular helper cells regulate the activation of B lymphocytes and antibody production during Plasmodium vivax infection. PLOS Pathogens (2017).
5. Development of B Cell Memory in Malaria. Frontiers in Immunology (2019).
6. The Plasmodium falciparum-Specific Human Memory B Cell Compartment Expands Gradually with Repeated Malaria Infections. PLOS Pathogens (2010).
7. B‐cell memory in malaria: Myths and realities. Immunological Reviews (2019).