Hidden immune structure in the skull may protect the brain

Biologists from Washington University School of Medicine in St. Louis have identified a previously unknown immune structure within the skull that appears to act as a protective hub for the brain. The findings were published in the journal Nature. Researchers discovered specialized lymphoid formations in the bone marrow of mouse skulls. These structures serve as centers for generating an immune response specifically aimed at protecting the brain. Previously, it was believed that such structures were absent in this region. Mechanism of the Immune Niche The team, led by Jonathan Kipnis, used fluorescent tracer proteins to track the movement of molecules from neurons to the skull's bone marrow. The study revealed that data is exchanged through microscopic channels in the dura mater (the outermost membrane of the brain), meaning the skull functions as an "immune niche" rather than just a structural frame.