Association between urinary levels of bisphenol-A and estrogen metabolism in Korean adults
- Association between urinary levels of bisphenol-A and estrogen metabolism in Korean adults
- 김은지; 이동호; 정봉철; 표희수; 이정애
- Bisphenol-A; Steroid hormone; Estrogen metabolism; Hydroxylase; Urine
- Issue Date
- The Science of the total environment
- VOL 470, 1401-1407
- Bisphenol-A (BPA) possesses estrogenic properties both in vitro and in vivo as an endocrine disrupting chemical.
Humans experience a long-term and cumulative exposure to BPA. BPA was detectable in 97.3% of 1904 urine
specimens from Korean adults. We investigated urinary estrogen concentrations in subjects with low and high
BPA concentrations and its possible association with estrogen metabolism. Urine samples were collected from
a high BPA concentration group (BPA-H; n = 100, 11.05 ± 20.47 μg/g creatinine) and a low BPA concentration
group (BPA-L; n = 100, 0.70 ± 0.22 μg/g creatinine) from Korea Biomonitoring Program of Hazardous Materials
Survey 2009.2010. Urinary estrogens were enzymatically hydrolyzed, extracted, and then derivatized for
quantitative analysis by gas chromatography.mass spectrometry. Estrogen levels were higher in the BPA-H
group than in the BPA-L group. Concentrations of estrone, 17β-estradiol, and their hydroxylated metabolites
in both men and women were significantly higher in the BPA-H group than in the BPA-L group (p b 0.04).
Furthermore, in the BPA-H group, estrogen metabolism to 4-hydroxy-estrone and 4-hydroxy-17β-estradiol
was more active than that to 2-hydroxy-estrone and 2-hydroxy-17β-estradiol. Although single measurement
and/or single spot urine samples limit the measurement of long-term exposure to BPA, we found significant
differences of estrogenmetabolismin the BPA-H and the BPA-L groups. The increase of hydroxyestrogens, especially
4-hydroxyestrogens, can be an important factor resulting negative effects of prolonged exposure to BPA.
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