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Oxidative damage mediates the association between polycyclic aromatic hydrocarbon exposure and lung function
Summary
Polycyclic aromatic hydrocarbon (PAH) exposure is linked to reduced lung function, potentially mediated by oxidative DNA damage. This study found that oxidative DNA damage plays a role in the association between high-molecular-weight PAH exposure and decreased forced vital capacity (FVC).
Area of Science:
- Environmental Health
- Toxicology
- Pulmonary Medicine
Background:
- Polycyclic aromatic hydrocarbons (PAHs) exposure is associated with reduced lung function.
- The role of oxidative damage in this association is not fully understood.
- This study investigates oxidative DNA and lipid damage as potential mediators.
Purpose of the Study:
- To explore the mediating role of oxidative DNA or lipid damage in the association between PAH exposure and lung function.
- To quantify the relationship between urinary PAH metabolites, oxidative stress markers, and lung function parameters.
Main Methods:
- Measured urinary monohydroxy polycyclic aromatic hydrocarbon metabolites (OH-PAHs), 8-hydroxy-2'-deoxyguanosine (8-OHdG), and 8-isoprostane (8-iso-PGF2α) in 3367 participants.
- Assessed lung function parameters including FEV1 and FVC.
- Utilized linear mixed models and mediation analysis to examine associations and mediation effects.
Main Results:
- Increased urinary OH-PAHs were associated with decreased FEV1 and FVC.
- Positive dose-response relationships were observed between OH-PAHs and oxidative damage markers (8-OHdG, 8-iso-PGF2α).
- Urinary 8-OHdG mediated 14.22% of the association between high-molecular-weight OH-PAHs and FVC.
Conclusions:
- Oxidative DNA damage may mediate the adverse effects of high-molecular-weight PAH exposure on lung function.
- Findings suggest a mechanism linking PAH exposure to lung function decline through oxidative stress.
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