B-cell memory in malaria: Myths and realities

Area of Science:

• Immunology
• Infectious Diseases
• Malariology

Background:

• B-cell and antibody responses are vital for controlling malaria parasite levels and immune pathology.
• Antibodies generated against Plasmodium parasites offer protection against reinfection.
• While long-lasting B-cell memory is observed in experimental models and human malaria, antibody responses in young children can be transient, suggesting impaired maintenance of circulating antibodies.

Purpose of the Study:

• To review recent literature on B-cell responses to Plasmodium infections.
• To investigate the controversial role of atypical memory B cells (AMB) in malaria immunity.
• To challenge existing perspectives on B-cell dysfunction in Plasmodium-infected individuals.

Main Methods:

• Literature review of studies on B-cell responses in malaria.
• Analysis of research on atypical memory B cells (AMB) in various chronic infections and conditions.
• Synthesis of conflicting findings regarding AMB function and contribution to immunity.

Main Results:

• Atypical memory B cells (AMB), characterized by inhibitory receptors and hyporesponsiveness, are expanded in malaria and other chronic infections.
• Contrasting evidence exists on AMB functionality; some studies suggest they are dysfunctional, while others indicate they can produce antibodies and contribute to protection.
• The precise role of AMB in malaria immunity remains debated, with implications for understanding long-term B-cell memory.

Conclusions:

• The maintenance of long-lived antibody responses in malaria, particularly in young children, is complex and potentially influenced by atypical memory B cells (AMB).
• Current understanding of AMB function in Plasmodium infections is controversial, necessitating further research to resolve their role in protective immunity versus immune dysfunction.
• Re-evaluation of established views on B-cell responses is needed to fully elucidate immunity to malaria.