Overview
- Published in Science Translational Medicine, the Trinity College Dublin–led research provides the first in‑living imaging evidence that repetitive head impacts can leave the blood–brain barrier leaky for years.
- Researchers scanned 47 retired football, rugby and boxing athletes an average of 12 years post‑career using contrast‑enhanced MRI, with 17 showing extensive leakage; non‑contact athletes and non‑athletes showed minimal signs.
- Greater leakiness tracked with worse performance on memory and executive function tests, indicating a link between vascular disruption and cognitive deficits.
- Postmortem brains diagnosed with CTE showed immune‑cell and blood‑protein infiltration consistent with barrier failure, supporting a proposed inflammation‑driven cascade that can include p‑Tau buildup.
- Authors propose BBB‑focused MRI for risk stratification, call for longitudinal monitoring of current players, and suggest trials of barrier‑reinforcing or anti‑inflammatory drugs alongside reviews of return‑to‑play policies.