Intermediate and Long-term Exposure to Air Pollution and Temperature and the Extracellular MicroRNA Profile of Participants in the Normative Aging Study (NAS)
Overview
Authors
Affiliations
Background: The molecular effects of intermediate and long-term exposure to air pollution and temperature, such as those on extracellular microRNA (ex-miRNA) are not well understood but may have clinical consequences.
Objectives: To assess the association between exposure to ambient air pollution and temperature and ex-miRNA profiles.
Methods: Our study population consisted of 734 participants in the Normative Aging Study (NAS) between 1999 and 2015. We used high-resolution models to estimate four-week, eight-week, twelve-week, six-month, and one-year moving averages of PM, O, NO, and ambient temperature based on geo-coded residential addresses. The outcome of interest was the extracellular microRNA (ex-miRNA) profile of each participant over time. We used a longitudinal quantile regression approach to estimate the association between the exposures and each ex-miRNA. Results were corrected for multiple comparisons and ex-miRNAs that were still significantly associated with the exposures were further analyzed using KEGG pathway analysis and Ingenuity Pathway Analysis.
Results: We found 151 significant associations between levels of PM, O, NO, and ambient temperature and 82 unique ex-miRNAs across multiple quantiles. Most of the significant results were associations with intermediate-term exposure to O, long-term exposure to PM, and both intermediate and long-term exposure to ambient temperature. The exposures were most often associated with the 75th and 90th percentile of the outcomes. Pathway analyses of significant ex-miRNAs revealed their involvement in biological pathways involving cell function and communication as well as clinical diseases such as cardiovascular disease, respiratory disease, and neurological disease.
Conclusion: Our results show that intermediate and long-term exposure to all our exposures of interest were associated with changes in the ex-miRNA profile of study participants. Further studies on environmental risk factors and ex-miRNAs are warranted.
Climate change and epigenetic biomarkers in allergic and airway diseases.
Cardenas A, Fadadu R, Bunyavanich S J Allergy Clin Immunol. 2023; 152(5):1060-1072.
PMID: 37741554 PMC: 10843253. DOI: 10.1016/j.jaci.2023.09.011.