High blood pressure harms multiple organs at cell level
High blood pressure is the most common risk factor for cardiovascular disease worldwide. Yet how that damage unfolds across different organs simultaneously has remained poorly understood. A new study maps this at the level of individual cells.
Scientists analyzed tissue from multiple organs in people and animals with and without high blood pressure (hypertension). Using single-cell analysis, a technique that measures gene activity in individual cells, they identified which cell types in each organ respond to elevated blood pressure. The study was published in Science.
The findings show that hypertension does not have a single uniform effect. Different cell types respond in the heart compared to the kidneys or blood vessels. Damage proceeds through different molecular pathways depending on the organ. That partly explains why a single antihypertensive drug does not work equally well for all organ complications.
What happens inside the cells
In each organ, specific supporting cell types, such as smooth muscle cells in vessel walls and fibroblasts in the heart, appeared to respond first. They activate genes associated with inflammation and scarring (fibrosis). These are the same processes involved in tissue aging. The atlas thus draws a direct link between blood pressure, inflammation, and tissue aging.
An atlas as a starting point
The researchers present their data as a cross-organ atlas: a detailed map of which cells are affected in which organs during hypertension. Such an atlas is a starting point for targeted treatments. Rather than simply lowering blood pressure in general, future therapies might address specific cellular processes organ by organ. Translation to clinical applications will require further research.
From a longevity perspective, this is significant: chronic low-grade inflammation across multiple organs simultaneously is a hallmark of accelerated aging. Hypertension appears to drive that process, and understanding the mechanisms organ by organ makes more precise interventions conceivable.
Search terms to explore further: single-cell hypertension organ damage, vascular fibrosis aging, cross-organ inflammaging