The Impact of Air Pollution on Kidney Function: A Two-Sample Mendelian Randomization Study.

Area of Science:

• Environmental Health
• Nephrology
• Genetic Epidemiology

Background:

• Chronic kidney disease (CKD) poses a significant global health burden.
• Emerging evidence suggests a link between air pollution and kidney dysfunction, but causal relationships remain unclear.
• Key air pollutants include particulate matter (PM2.5, PM2.5-10, PM10) and nitrogen oxides (NOx, NO2).

Purpose of the Study:

• To investigate the potential causal impact of various air pollutants on kidney function.
• To utilize Mendelian randomization (MR) to assess genetic links between air pollution exposure and kidney disease indicators.

Main Methods:

• A two-sample Mendelian randomization (MR) study design was employed.
• Summary data from genome-wide association studies (GWAS) were utilized.
• Multiple MR methods (IVW, MR-Egger, weighted median, etc.) were applied, with sensitivity analyses to ensure robustness.

Main Results:

• Exposure to PM2.5-10 was significantly associated with increased CKD risk, reduced estimated glomerular filtration rate (eGFRcrea, eGFRcys).
• Nitrogen oxides (NOx) showed a causal link with decreased eGFRcys.
• Nitrogen dioxide (NO2) exposure correlated with elevated urine albumin-to-creatinine ratio (UACR).
• No significant associations were found for PM2.5 or PM10 exposure with kidney function markers.

Conclusions:

• Mendelian randomization analysis supports a genetic causal relationship between specific air pollutants (PM2.5-10, NOx, NO2) and impaired kidney function.
• Findings highlight air pollution as a potential contributor to kidney disease pathogenesis.
• Further research into mechanisms and clinical implications for air pollution-mediated kidney diseases is warranted.