LONG-TERM exposure to air pollution was associated with a significantly increased risk of aortic stenosis, according to new research that also identified a potential interaction between environmental exposure and genetic susceptibility.
Aortic stenosis is a progressive heart valve disease in which the aortic valve narrows, restricting blood flow from the heart. As the condition advances, it can lead to heart failure, reduced quality of life, and premature death. While air pollution is already recognised as a major cardiovascular risk factor, its specific role in the development of aortic stenosis has remained unclear.
Air Pollution and Aortic Stenosis Risk
Researchers analysed data from the UK Biobank to investigate whether long-term exposure to common air pollutants influenced the risk of developing aortic stenosis. The study focused on fine particulate matter (PM2.5), coarse particulate matter (PM10), nitrogen dioxide (NO2), and nitrogen oxides (NOx).
The findings showed that higher exposure to each pollutant was associated with a greater risk of incident aortic stenosis. For every standard deviation increase in exposure, the risk rose by 60% for PM2.5, 37% for PM10, 37% for NO2, and 36% for NOx. The associations remained consistent across multiple validation analyses designed to test the robustness of the results.
Genetic Susceptibility Amplifies Risk
The researchers also examined whether genetic predisposition influenced the relationship between air pollution and aortic stenosis. They found evidence of both joint and interactive effects, suggesting that individuals with a higher genetic susceptibility may be particularly vulnerable to the harmful cardiovascular effects of polluted air.
These findings highlight the importance of considering both environmental and genetic factors when assessing future cardiovascular risk.
Biological Clues Behind the Association
To explore potential mechanisms, the team conducted network toxicology and bioinformatics analyses. Several key genes linked to particulate matter exposure and aortic stenosis were identified.
These genes were enriched in pathways involved in lipid metabolism, atherosclerosis, fluid shear stress, and interleukin-17 signalling, all of which have previously been implicated in cardiovascular disease and valve degeneration. The results provide biological support for the epidemiological findings and offer insights into how air pollution may contribute to the development of aortic stenosis.
Implications for Public Health
The authors noted that the findings were replicated in an independent cohort, strengthening confidence in the observed associations. However, as an observational study, the research cannot definitively prove causation.
Nevertheless, the results suggest that reducing exposure to air pollution could represent an important strategy for lowering the burden of aortic stenosis. The study also underscores the need for future research exploring how environmental and genetic risk factors interact to influence cardiovascular health and disease progression.
Reference
Ma Y et al. Epidemiological and bioinformatics analyses of air pollution and genetic susceptibility in aortic stenosis risk. Nat Commun. 2026; DOI:10.1038/s41467-026-73026-y.
Featured image: nilanka on Adobe Stock
