Federation of Clinical Immunology Societies (FOCIS)

Jang Hyun Park discusses how adaptive immunity monitors the central nervous system through lymphoid structures in skull bone marrow. The study identifies germinal-centre-like formations containing follicular-helper-like T cells that promote B-cell activation and humoral responses through CD40L, IL-21 and interferon-gamma signalling. In mouse models, these cells respond to CNS-derived antigens and contribute to anti-tumour immunity in the brain. The findings establish a local site of antigen-specific CNS surveillance and raise questions about its role across neurological diseases.