Increased levels of bisphenol A (BPA) in Thai girls with precocious puberty

Background: Reports on the secular trend of pubertal onset indicate a recent earlier start especially in girls.-Bisphenol A (BPA), which posses estrogenic activity, might be a cause of advanced puberty. The objective of the study was to determine the association between BPA and advanced puberty. Methods: A cross-sectional study was conducted in patients with advanced puberty (n=41) compared to age-matched controls (n=47). Anthropometric measurements, estradiol, basal and gonadotropin releasing hormone (GnRH)-stimulated follicle stimulating hormone (FSH) and luteinizing hormone (LH) levels, uterine sizes, ovarian diameters and bone ages were obtained. Urinary BPA concentrations were analyzed by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC/MSMS) with the lower limit of quantification (LLOQ) of 0.05 ng/mL. Results: The median adjust-BPA concentration in advanced puberty group was higher than in control groups [1.44 vs. 0.59 mu g/g creatinine (Cr): p<0.05]. We also found that the median adjust-BPA concentration in girls with advanced puberty who were overweight/obese, was greater than in the normal pubertal overweight/obese girls (1.74 vs. 0.59 mu g/g Cr: p<0.05), and was in the same trend among normal weight girls with advanced and normal puberty (0.83 vs. 0.49 mu g/g Cr: p=0.09), but not statistically significant. Conclusions: The present findings suggest that BPA exposure appears to be related to an earlier age at onset of puberty especially in obese girls.