A human blood vessel atlas maps how arteries age
Aging is not evenly distributed across the body. Even in blood vessels, a tissue everyone has, the process unfolds differently in each cell type. A new study maps this in detail for the first time in humans.
Researchers analysed the gene activity patterns of thousands of individual cells from human blood vessels, sampled across a wide age range. The result is a detailed atlas of vascular aging. The study, published in Nature Aging, identified several notable changes: with increasing age, the formation of new blood vessels (angiogenesis) declines, how cells sense and respond to mechanical forces shifts, and a specific gene activity pattern linked to cell aging (the state in which cells stop dividing and become dysfunctional) becomes more prominent.
Why blood vessel aging matters
Blood vessels do more than carry blood. They regulate the delivery of oxygen and nutrients to every organ. As vessels age, tissues receive less adequate blood supply. This contributes to cardiovascular disease, but also to aging of organs such as the brain and kidneys.
The atlas shows that a consistent pattern of gene activity is linked to cell aging in blood vessel wall cells called endothelial cells. That pattern is even recognisable in the vessels of other mammals, suggesting it reflects a fundamental aging mechanism.
What this atlas enables
A detailed map of vascular aging is useful for several purposes. Researchers can use it to identify specific cell types most vulnerable to aging. That could provide leads for new treatments aimed at slowing vascular deterioration.
The findings are based on human tissue, which is a strength compared to many studies that use animals instead. However, this type of study cannot on its own establish whether the observed changes cause aging or result from it.
Search terms for further reading: blood vessel cell gene activity and aging, decline of new blood vessel growth in aging, vascular cell aging single-cell analysis