Association between fine particulate matter and coronary heart disease: A miRNA microarray analysis

Area of Science:

• Environmental Health
• Cardiovascular Disease Epidemiology
• Molecular Biology

Background:

• Particulate matter (PM2.5) is linked to coronary heart disease (CHD), but biological mechanisms are not fully understood.
• Research is needed to elucidate how PM2.5 exposure influences cardiovascular health.
• Identifying specific molecular pathways is crucial for understanding PM2.5's impact on CHD.

Purpose of the Study:

• To investigate the biological mechanisms underlying the association between PM2.5 exposure and CHD risk.
• To explore the role of microRNAs, specifically miR-4726-5p, in mediating this relationship.
• To examine the interaction between PM2.5, miR-4726-5p, and blood pressure in CHD development.

Main Methods:

• Cross-sectional study of 942 CHD patients and 1723 controls with residential stability.
• Utilized satellite-based PM2.5 estimates (1998-2019) and microRNA microarray analysis.
• Performed pathway analysis and assessed mediation and interaction effects, including blood pressure.

Main Results:

• Higher PM2.5 exposure was associated with increased CHD risk (OR=1.22 per 10 μg/m³ increase).
• Systolic blood pressure mediated 6.6% of the PM2.5-CHD association.
• An interaction effect between PM2.5 and miR-4726-5p was observed, influencing CHD development via RhoA regulation and blood pressure.

Conclusions:

• PM2.5 exposure significantly increases CHD risk.
• miR-4726-5p and PM2.5 interact to affect CHD development, partly through modulation of blood pressure.
• Understanding these molecular and physiological interactions is key to mitigating air pollution's cardiovascular impact.