Brain blood-vessel cell makeup differs with age in mice
One cell type lining tiny brain vessels accounted for 45% of vessel-lining cells sampled from old mice, compared with 57% from young mice.
68,316 brain ecs
Limit: The gene-activity analysis involved only six male mice
Edited by Boris Djordjevic · AgingResearch.News
In a cross-sectional animal study, researchers compared brain blood-vessel lining cells from three 14-week-old and three 84-week-old male C57BL/6J mice. They measured gene activity in individual cells and identified five cell subtypes.
Older mice had a smaller share of one subtype lining capillaries, the smallest blood vessels, and larger shares of arterial cells and one venous subtype. Many genes were less active in older mice, although overall gene-activity trends were largely similar across subtypes. Analyses of potential signals between cells suggested that signaling activity was redistributed among cell subtypes in older mice. The authors concluded that age-related changes in these cells contribute to disruption of the blood-brain barrier.
Why it matters
The blood-brain barrier helps control what enters the brain from the blood and weakens with age. Mapping its vessel-lining cells may help researchers investigate the processes involved in that decline.
Caveats
This cross-sectional comparison cannot establish that the cell differences caused barrier damage. The gene-activity analysis involved only six male mice.
The paper
Single-cell transcriptomic analysis reveals age-related remodeling of brain endothelial cells
Tulane University
Aging Brain, Jul 31, 2026, Open access
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