Air Pollution: Another Threat to HDL Function.

Area of Science:

• Environmental Health
• Cardiovascular Medicine
• Toxicology

Background:

• Epidemiological studies consistently link air pollution exposure, particularly fine particulate matter (PM2.5), to increased cardiovascular disease incidence.
• Air pollution is recognized as a modifiable risk factor for cardiovascular mortality, acute coronary syndrome, stroke, heart failure, and arrhythmias.
• Adverse effects are observed even at low pollution levels, suggesting no safe threshold exists.

Purpose of the Study:

• To review the impact of air pollution on cardiovascular disease.
• To explore the effects of air pollution on high-density lipoprotein (HDL) function.
• To identify knowledge gaps regarding air pollutant effects on HDL.

Main Methods:

• Review of epidemiological studies and scientific literature.
• Analysis of associations between air pollutants (e.g., PM2.5) and cardiovascular outcomes.
• Examination of evidence on air pollution's impact on HDL cholesterol levels and function.

Main Results:

• Long-term air pollution exposure may accelerate atherosclerosis via inflammation and oxidative stress, affecting dyslipidemia and hypertension.
• Evidence suggests air pollution impairs HDL function, reducing cholesterol efflux capacity, antioxidant/anti-inflammatory potential, and nitric oxide release.
• The impact on HDL-cholesterol levels remains debated, but functional impairments are increasingly recognized.

Conclusions:

• Air pollution poses a significant risk to cardiovascular health, impacting multiple disease pathways.
• Dysfunction of high-density lipoproteins (HDL) is a potential mechanism through which air pollution exerts adverse cardiovascular effects.
• Further research is crucial to understand pollutant-specific effects on HDL function and underlying mechanisms.