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Journal Article Ppublish 32 citations

PubMed: 37890265 DOI: 10.1016/j.envint.2023.108270

Air pollution and epigenetic aging among Black and White women in the US.

Environ Int 181:108270

Authors: Sarah H Koenigsberg, Che-Jung Chang, Jennifer Ish, Zongli Xu, Jacob K Kresovich, Kaitlyn G Lawrence, Joel D Kaufman, Dale P Sandler, Jack A Taylor, Alexandra J White

Affiliations

  • Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, 123 W. Franklin St. Chapel Hill, NC 27517, USA; Epidemiology Branch, National Institute of Environmental Health Sciences, 111 TW Alexander Dr, Research Triangle Park, NC 27709, USA.
  • Epidemiology Branch, National Institute of Environmental Health Sciences, 111 TW Alexander Dr, Research Triangle Park, NC 27709, USA.
  • Epidemiology Branch, National Institute of Environmental Health Sciences, 111 TW Alexander Dr, Research Triangle Park, NC 27709, USA; Departments of Cancer Epidemiology and Breast Oncology, H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL 33612, USA.
  • Departments of Environmental & Occupational Health Sciences, Medicine, and Epidemiology University of Washington, 4225 Roosevelt Way NE, Seattle, WA 98105, USA.
  • Epidemiology Branch, National Institute of Environmental Health Sciences, 111 TW Alexander Dr, Research Triangle Park, NC 27709, USA.

Abstract

BACKGROUND

DNA methylation-based measures of biological aging have been associated with air pollution and may link pollutant exposures to aging-related health outcomes. However, evidence is inconsistent and there is little information for Black women.

OBJECTIVE

We examined associations of ambient particulate matter <2.5 μm and <10 μm in diameter (PM 2.5 and PM 10) and nitrogen dioxide (NO 2) with DNA methylation, including epigenetic aging and individual CpG sites, and evaluated whether associations differ between Black and non-Hispanic White (NHW) women.

METHODS

Validated models were used to estimate annual average outdoor residential exposure to PM 2.5, PM 10, and NO 2 in a sample of self-identified Black (n=633) and NHW (n=3493) women residing in the contiguous US. We used sampling-weighted generalized linear regression to examine the effects of pollutants on six epigenetic aging measures (primary: DunedinPACE, GrimAgeAccel, and PhenoAgeAccel; secondary: Horvath intrinsic epigenetic age acceleration [EAA], Hannum extrinsic EAA, and skin & blood EAA) and epigenome-wide associations for individual CpG sites. Wald tests of nested models with and without interaction terms were used to examine effect measure modification by race/ethnicity.

RESULTS

Black participants had higher median air pollution exposure than NHW participants. GrimAgeAccel was associated with both PM 10 and NO 2 among Black participants, (Q4 versus Q1, PM 10: β=1.09, 95% CI: 0.16-2.03; NO 2: β=1.01, 95% CI 0.08-1.94) but not NHW participants (p-for-heterogeneity: PM 10=0.10, NO 2=0.20). In Black participants, we also observed a monotonic exposure-response relationship between NO 2 and DunedinPACE (Q4 versus Q1, NO 2: β=0.029, 95% CI: 0.004-0.055; p-for-trend=0.03), which was not observed in NHW participants (p-for-heterogeneity=0.09). In the EWAS, pollutants were significantly associated with differential methylation at 19 CpG sites in Black women and one in NHW women.

CONCLUSIONS

In a US-wide cohort study, our findings suggest that air pollution is associated with DNA methylation alterations consistent with higher epigenetic aging among Black, but not NHW, women.

MeSH

Environmental Pollutants, Air Pollution, Aging, Air, Environmental Pollution, Environmental Health

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