Functional role of skull lymphoid structures in CNS immunosurveillance.

Skull bone marrow contains lymphoid structures with germinal-center-like formations that support CNS immune surveillance and anti-tumor responses in mice.

• Why it matters: Understanding how the CNS interacts with the immune system is crucial for developing treatments for neurological diseases and brain cancers, yet the specific immune mechanisms remain unclear.
• What they did: The study identified lymphoid structures in the skull bone marrow featuring follicular-helper-like T cells that activate B cells and respond to CNS-derived antigens, especially in brain cancer models.
• The result: These structures enable CNS immune surveillance and may influence immune responses in various neurological conditions, opening new avenues for immunotherapy targeting the skull marrow.