Association between air pollution and osteoporosis: A Mendelian randomization study

Area of Science:

• Environmental Health
• Bone Metabolism
• Genetic Epidemiology

Background:

• Osteoporosis (OP) is a major health concern in aging societies.
• Emerging evidence suggests a link between air pollution and increased OP incidence, but causality remains unproven.
• Understanding environmental risk factors for OP is crucial for public health interventions.

Purpose of the Study:

• To investigate the potential causal relationship between exposure to specific air pollutants and total-body bone mineral density (BMD).
• To assess the association between air pollution and the risk of developing osteoporosis using genetic data.
• To provide evidence for public health strategies aimed at mitigating OP.

Main Methods:

• Mendelian randomization (MR) analysis was employed to assess causality.
• Utilized summary statistics from genome-wide association studies (GWAS) for air pollutants (nitrogen oxides, PM2.5) and BMD.
• Inverse variance weighting (IVW) was the primary analytical method, with checks for heterogeneity and pleiotropy.

Main Results:

• A potential causal association was found between higher exposure to nitrogen oxides and PM2.5 and lower total-body BMD.
• The MR analysis indicated a significant inverse relationship: nitrogen oxides (β = -0.59, P = 0.008) and PM2.5 (β = -0.60, P = 0.025).
• No evidence of heterogeneity or pleiotropy was detected, strengthening the findings.

Conclusions:

• This study provides compelling genetic evidence for a causal link between nitrogen oxides, PM2.5 exposure, and reduced BMD, contributing to osteoporosis development.
• Air pollution is associated with an elevated risk of osteoporosis.
• Reducing exposure to specific air pollutants like nitrogen oxides and PM2.5 may be a viable strategy for osteoporosis prevention.