Abstract
The aim of this study was to evaluate the potential association of urinary Bisphenol A (BPA) levels with estrogen receptor alpha (ESR1) promoter % methylation and relative telomere length in a sample of 482 participants. Urinary BPA concentration was measured using organic phase extraction followed by high performance liquid chromatography mass spectroscopy. Peripheral blood ESR1 promoter % methylation and relative telomere length were measured using direct bisulfite sequencing and real-time polymerase chain reaction, respectively. The mean ± SD urinary BPA concentration adjusted for urinary creatinine was 2.90 ± 4.81 (μg/g creatinine) with a median of 1.86 μg/g creatinine (min–max: <LOD −69.85). There was a potentially non-monotonic relationship between adjusted urinary BPA concentrations and ESR1 promoter % methylation in men. As a matter of fact, for the lowest tertile of ESR1 promoter % methylation, the OR and 95% CI of the middle and highest tertiles of urinary adjusted BPA were 2.54 (1.01–6.39) and 1.64 (0.55–4.86) when compared to the lowest BPA tertile, respectively. After adjustment for potential confounders, similar results remained in men and appeared in the whole cohort. As for relative telomere length, there was a significant trend whereby higher adjusted urinary BPA concentrations were significantly associated with shorter relative telomere length in females. For instance, for the shortest relative telomere length tertile, the OR and 95% CI of the middle and highest tertiles of urinary adjusted BPA were 2.91 (1.38–6.16) and 3.19 (1.57–6.49) when compared to the lowest BPA tertile, respectively. This trend remained significant after adjustment for potential confounders.
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Long-term exposure to “low-dose” bisphenol A decreases mitochondrial DNA copy number, and accelerates telomere shortening in human CD8 + T cells
Scientific Reports Open Access 25 September 2020
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Acknowledgements
This work was supported by the American University of Beirut Faculty of Medicine seed grant to Dr. Hani Tamim and Research grant to Dr. Nathalie K. Zgheib as well as a Lebanese National Council for Scientific Research (LNCSR) PhD scholarship award to Miss Zainab Awada.
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Awada, Z., Sleiman, F., Mailhac, A. et al. BPA exposure is associated with non-monotonic alteration in ESR1 promoter methylation in peripheral blood of men and shorter relative telomere length in peripheral blood of women. J Expo Sci Environ Epidemiol 29, 118–128 (2019). https://doi.org/10.1038/s41370-018-0030-4
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DOI: https://doi.org/10.1038/s41370-018-0030-4
Keywords
- Bisphenol A
- Estrogen receptor alpha
- relative telomere length
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