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Skull Bone Marrow Holds Hidden Immune Hub That Fights Brain Cancer

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WashU scientists found lymph node-like immune structures in skull bone marrow that respond fast to brain tumors in mice, pointing to new glioblastoma therapies.

Scientists at Washington University School of Medicine in St. Louis have found immune structures resembling lymph nodes tucked inside the bone marrow of the skull, and early experiments in mice suggest they act as a fast-acting defense against brain cancer. The work, published in the journal *Nature*, is the first to locate immune coordination centers of this type inside bone.

The team, led by senior author Jonathan Kipnis, reported that these structures sit close enough to the brain to mount a response before signals of trouble reach lymph nodes elsewhere in the body. The researchers also detected comparable immune cells in samples of human skull bone marrow, an indication that the system is unlikely to be confined to mice.

"This study reveals that the skull bone marrow is far more than just a structural framework -- it harbors previously unrecognized hubs for brain-specific immune responses," said Kipnis, the Alan A. and Edith L. Wolff Distinguished Professor of Pathology & Immunology and a BJC Investigator at WashU Medicine. He said the finding "changes how we view neuroimmune interactions and opens exciting new avenues for treating brain tumors and other neurological diseases."

For decades, researchers assumed the brain operated apart from the immune system. That assumption has unraveled over the past several years, in part through earlier work from the Kipnis laboratory. His group previously identified lymphatic vessels running through the dura mater, the tough outer membrane that wraps the brain just under the skull. The team later described narrow physical channels linking the skull, the dura and brain tissue, forming a passage that lets immune cells and cellular waste move between the brain and the neighboring skull bone marrow.

Tracking proteins into the bone

In the new study, the scientists traced proteins as they exited the brain, passed through those channels and settled in the skull bone marrow. Inside, they found organized immune clusters that mirrored the architecture of lymph nodes. Such nodes act as command posts for the immune system, where T follicular helper cells assist B cells in churning out the antibodies the body uses to fight infection and disease.

Uncovering that arrangement in otherwise healthy bone caught the researchers off guard. "We have never seen such structures in healthy bone marrow before," said first author Jang Hyun Park, a postdoctoral research fellow in the Kipnis lab who is launching his own laboratory at the Korea Advanced Institute of Science and Technology this fall. "It is an exciting discovery that points out that a complex brain requires its own specialized immune structures to defend it."

Testing the hubs against glioblastoma

To learn whether the structures do more than exist, the team turned to a mouse model of glioblastoma, one of the most aggressive brain cancers. Using a drug, the researchers switched off the skull immune hubs in some animals. In those mice, tumors advanced faster than in animals whose hubs were left working, and the affected mice did not live as long. The results tied the local immune centers directly to the body's response against the cancer.

The scientists then asked whether the hubs could be pushed to work harder. They designed a treatment meant to ramp up antibody production inside the skull bone marrow, blending three immune-stimulating proteins into a gel and applying it directly under the scalp. The approach set off a wave of immune activity aimed at the tumors.

Notably, that activity started in the immune hubs within the skull bone marrow and only spread outward afterward, matching the study's picture of the skull as a first line of defense positioned unusually close to the brain.

The findings reframe the skull as an active participant in protecting the brain rather than a passive shell. Because the researchers delivered their experimental gel just beneath the scalp, the work also raises the prospect of treatments aimed squarely at the skull rather than the brain itself. Whether the strategy can be adapted for people remains to be tested, but the presence of similar immune cells in human skull bone marrow gives the researchers a concrete reason to keep looking. For now, the results add a new layer to a fast-shifting understanding of how the brain and the immune system stay in contact.

skull immune organ, brain cancer immunity, glioblastoma treatment, skull bone marrow, Jonathan Kipnis WashU, neuroimmune research, brain tumor therapy, Nature study

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