Overview
- The peer-reviewed study was published on June 10, 2026 in Nature Neuroscience and reports single-cell evidence for a damaging interaction in human aneurysm walls.
- Researchers profiled more than 100,000 individual cells and mapped 19 distinct cell types to create an atlas of healthy and aneurysm artery tissue.
- They found loss of smooth muscle cells and replacement by activated, scar-forming fibroblasts that sit next to macrophages and send a signal that makes those macrophages produce matrix-degrading enzymes.
- Blocking the fibroblast signal in lab experiments caused macrophages to make fewer destructive enzymes, which supports a causal feedback loop but remains preclinical and needs replication and safety testing.
- Early funding from the Brain Aneurysm Foundation supported the work, and the findings could eventually change practice by adding biology-based risk markers and stabilization treatments to current size-based monitoring rules.