Overview
- Published in Science Translational Medicine, the Trinity College Dublin–led study used contrast MRI on 47 retired football, rugby and boxing athletes about 12 years after retirement, with 17 showing widespread permeability.
- Compared with non-contact athletes and non-athletes, those with greater barrier disruption performed worse on memory and cognitive tests.
- Postmortem examinations of brains from people with CTE revealed infiltration of blood proteins and immune cells in affected regions, supporting a vascular–immune pathway.
- The authors say blood–brain barrier–focused imaging could help identify at-risk individuals and enable prospective monitoring in current players, pending validation in larger longitudinal cohorts.
- Researchers and commentators point to potential trials of BBB-stabilizing or anti-inflammatory drugs, and Irish clinicians are calling for government-led reviews of return-to-play rules and broader safety policy.