Abstract
Inorganic arsenic (iAs) is a carcinogen and could increase the risks of bladder, lung, and skin cancer. Mining and smelting of non-ferrous metals are common occupational arsenic exposures. In this study, 125 individuals working in non-ferrous metal smelting plants were separated into two groups according to urinary total arsenic (TAs) levels: group 1, TAs < 100 μg/g Cr; group 2, TAs ≥ 100 μg/g Cr. Demographic characteristics of participants were obtained by questionnaire interview. Levels of E-cadherin soluble ectodomain fragment (sEcad) and epidermal growth factor (EGF) in workers urine were determined by ELISA test. We found that concentrations of sEcad and EGF present in urine were significantly elevated in the high urinary arsenic group 2 compared with the low urinary arsenic group 1. Urinary levels of the shedding of E-cadherin soluble ectodomain fragment (sEcad) and epidermal growth factor (EGF) were positively related to the concentrations of iAs in urine after adjusting for the confounding effects. A positive correlation between sEcad and EGF concentrations in urine was also observed. In order to verify the effects of iAs on sEcad and EGF, the human uroepithelial cell line (SV-HUC-1) was treated with NaAsO2 for 24 h in vitro. sEcad and EGF levels in the 4 μM NaAsO2-treated SV-HUC-1 cell medium significantly increased compared to the control group. In conclusion, urinary levels of sEcad and EGF increased in higher urinary arsenic workers of non-ferrous metal plants and are closely associated with urinary iAs concentration. The results suggested that sEcad and EGF may potentially be preclinical prognostic factors of bladder injury and early detection in arsenic exposure individuals.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC) (81373023 and 81673207) and the Program for Liaoning Innovative Research Team in University (LT2015028).
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All participants provided informed consents before the questionnaire interview and then donated urine. The study was approved by the China Medical University Ethics Committee.
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The authors declare that they have no conflict of interest.
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Liu, J., Jin, P., Liu, S. et al. sEcad and EGF Levels Increased in Urine of Non-ferrous Metal Workers and Medium of Uroepithelial Cell Line Treated by Arsenic. Biol Trace Elem Res 183, 32–39 (2018). https://doi.org/10.1007/s12011-017-1124-x
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DOI: https://doi.org/10.1007/s12011-017-1124-x