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Maternal and newborn metabolomic changes associated with urinary polycyclic aromatic hydrocarbon metabolite concentrations at delivery: an untargeted approach

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Abstract

Introduction

Prenatal exposure to polycyclic aromatic hydrocarbons (PAHs) has been associated with adverse human health outcomes. To explore the plausible associations between maternal PAH exposure and maternal/newborn metabolomic outcomes, we conducted a cross-sectional study among 75 pregnant people from Cincinnati, Ohio.

Method

We quantified 8 monohydroxylated PAH metabolites in maternal urine samples collected at delivery. We then used an untargeted high-resolution mass spectrometry approach to examine alterations in the maternal (n = 72) and newborn (n = 63) serum metabolome associated with PAH metabolites. Associations between individual maternal urinary PAH metabolites and maternal/newborn metabolome were assessed using linear regression adjusted for maternal and newborn factors while accounting for multiple testing with the Benjamini-Hochberg method. We then conducted functional analysis to identify potential biological pathways.

Results

Our results from the metabolome-wide associations (MWAS) indicated that an average of 1% newborn metabolome features and 2% maternal metabolome features were associated with maternal urinary PAH metabolites. Individual PAH metabolite concentrations in maternal urine were associated with maternal/newborn metabolome related to metabolism of vitamins, amino acids, fatty acids, lipids, carbohydrates, nucleotides, energy, xenobiotics, glycan, and organic compounds.

Conclusion

In this cross-sectional study, we identified associations between urinary PAH concentrations during late pregnancy and metabolic features associated with several metabolic pathways among pregnant women and newborns. Further studies are needed to explore the mediating role of the metabolome in the relationship between PAHs and adverse pregnancy outcomes.

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Data Availability

Raw data would be available upon request to the corresponding authors. The R code to perform the analyses are available via a GitHub repository: https://github.com/jagadeeshpuvvula/PAH_MWAS.

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Acknowledgements

We acknowledge the staff assistance from Department of Obstetrics and Gynecology at University of Cincinnati in participant recruitment. We are thankful to our study participants for their time and efforts.

Funding

This research was funded by pilot projects from the National Institute of Environmental Health Sciences (NIEHS) and supported by the Center of Environmental Genetics (P30ES006096) at the University of Cincinnati. This project was also supported by grants from the Veteran Affairs [VA-I01BX005395 (SMH, YKL), VA‐IK6BX006182 (SMH)], NIEHS [R01ES032675 (SMH, YKL), P30ES013508, R01ES028277 (AC), R01ES033054 (AC), R01ES032836 (JMB)], Department of Defense [DoD‐W81XWH‐22‐1‐0152 (SMH, YKL, AC)], and National Science Foundation [RII Track‐2 FEC, Award #2217824 (SMH, YKL)].

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AC, JP, KEM, JMB, AMV, SMH, YKL, SSK, ZPP, EAD, and SH conceptualized the study. EDF collected maternal urine, for exposure assessment; and blood (maternal and cord) for metabolomics. DK processed blood samples for metabolomics. KEM, KDP, DPJ, and VT provided metabolomics expertise and performed untargeted metabolome assays. JP performed statistical analysis with guidance from AC, JMB, and KEM. JP drafted the manuscript. All authors reviewed, edited, and approved the final version of the manuscript.

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Correspondence to Jagadeesh Puvvula or Aimin Chen.

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Puvvula, J., Manz, K.E., Braun, J.M. et al. Maternal and newborn metabolomic changes associated with urinary polycyclic aromatic hydrocarbon metabolite concentrations at delivery: an untargeted approach. Metabolomics 20, 6 (2024). https://doi.org/10.1007/s11306-023-02074-y

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