Overview
- A Washington University study published Thursday found that dendritic cells in peripheral lymph nodes prime CD8+ T cells that then infiltrate the brain and worsen tau-driven neurodegeneration in mouse models.
- Genetically removing those peripheral dendritic cells stopped the rise of brain T cells, cut neurodegeneration and preserved cognition in the mice even though tau levels in the brain stayed the same.
- The work implicates classical dendritic cells type 1 (cDC1) and CD8+ T cells and raises the possibility that tau-derived material reaching cervical lymph nodes triggers the response, a mechanism the team plans to test.
- Researchers say the pathway points to treatment targets outside the blood–brain barrier that could be manipulated with existing immune therapies, but they warn the findings are preclinical and human relevance is not yet shown.
- The study builds on Holtzman lab findings that brain T cells drive tau damage and motivates follow-up experiments to test late-life interventions, selective targeting of neck lymph nodes, and the molecular homing signals used by T cells.