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Quantification of ethyl glucuronide, ethyl sulfate, nicotine, and its metabolites in human fetal liver and placenta

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Abstract

Purpose

Tobacco and alcohol use during pregnancy is serious public health concerns and result in adverse developmental outcomes. Identifying in utero exposure is often achieved through meconium analysis or via maternal self-report. In this study, we analyzed fetal liver and placenta to examine second trimester alcohol and smoking exposure.

Methods

A validated liquid chromatography–tandem mass spectrometry method for simultaneous analysis of nicotine and its metabolites and alcohol markers (ethyl glucuronide: EtG and ethyl sulfate: EtS) was employed to analyze 193 fetal liver and 48 placenta (n = 47 paired) samples from electively terminated pregnancies.

Results

EtG, EtS, and nicotine markers’ limits of detection were 0.7–20 ng/g in fetal samples. Ninety-eight fetal liver and 23 placenta samples were EtG/EtS-positive, while 137 liver and 25 placenta samples were positive for tobacco exposure. When both alcohol markers were present in samples, EtG/EtS ratios were 1.6–11.1 in 17 livers and 2.5–31.1 in 10 placentas. Median (range) summed tobacco marker concentrations were 422 (1.0–2776) and 154 (1.6–1621) ng/g in livers and placentas, respectively. Median EtG and nicotine marker concentrations were higher in liver than placenta in paired samples. Strong evidence of exposure occurred in 11 and 22 pairs, respectively, when both samples were positive for alcohol and/or tobacco markers.

Conclusions

These paired fetal liver and placenta alcohol and tobacco data provided a unique means for examining the effects of in utero exposure, a critical first step in selecting fetal samples for proteomic and RNA sequencing studies that could provide mechanisms for adverse developmental outcomes.

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Acknowledgements

This research was supported by the Medical Research Council (UK) grant MR/L01 0011/1 and the Intramural Research Program at the National Institute on Drug Abuse of the National Institutes of Health. Paired fetal liver and placenta samples were graciously provided by the Joint Medical Research Council/Wellcome Trust (grant number 099175/Z/12/Z) Human Developmental Biology Resource (www.hdbr.org).

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Correspondence to Marilyn A. Huestis.

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The authors declare that they have no conflicts of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of all involved institutions and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Collection of fetal liver material was approved by the National Health Service Grampian Research Ethics Committees (REC04/S0802/21). This article does not contain any studies with animals performed by any of the authors. Informed consent was obtained from all individual participants included in the study. No identify information is included in this article.

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Swortwood, M.J., Bartock, S.H., Scheidweiler, K.B. et al. Quantification of ethyl glucuronide, ethyl sulfate, nicotine, and its metabolites in human fetal liver and placenta. Forensic Toxicol 36, 102–112 (2018). https://doi.org/10.1007/s11419-017-0389-2

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  • DOI: https://doi.org/10.1007/s11419-017-0389-2

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