Bisphenol A and polychlorinated biphenyls enhance the cancer stem cell properties of human ovarian cancer cells by activating the WNT signaling pathway.

Abstract

Cancer stem cells (CSCs) are a very small subpopulation that have stem-cell qualities, such as exhibiting self-renewal, immortality, and pluripotency, and the capability to differentiate into different tumor cell subtypes. CSCs contribute to tumor onset, expansion, metastasis, resistance and recurrence. Meanwhile, organic pollutants, including nonpersistent pollutants, such as bisphenol A (BPA), and persistent pollutants, such as polychlorinated biphenyls (PCBs), are toxic chemicals that can be readily ingested via dietary exposure and other exposure routes and can accumulate through the food chain. Many organic pollutants increase the risk of ovarian cancer depending on their estrogenic effects. Nonetheless, most previous studies have focused on the toxic effects of these pollutants on the proliferation, metastasis and development of ovarian cancer cells. However, little research has investigated the adverse effect of these pollutants on ovarian cancer stem cells. The current study found that BPA, PCB126 and PCB153 greatly enhanced the formation of cancer stem-like cell spheres of OVCAR-3 cells (human ovarian cancer cells) under low-dose exposure. In parallel, the CD44highCD24low cell subpopulation was increased in treated cells relative to untreated cells. Elevated expression of cancer stem cell markers, including ALDH1A1, CD133, SOX2, NANOG and OCT4, was demonstrated in treated cells compared to untreated cells. In summary, these data demonstrate that the oncogenic effects of pollutants can be evaluated according to changes in caner stem cell properties.

• Authors: Yifan Guo, Bin Li, Xu Yan, Xinming Shen, Juan Ma, Sijin Liu, Daoqiang Zhang
• Journal: Chemosphere (Chemosphere) Vol. 246 Pg. 125775 (May 2020) ISSN: 1879-1298 [Electronic] England
• PMID: 31918092 (Publication Type: Journal Article)
• Copyright: Copyright © 2020 Elsevier Ltd. All rights reserved.

Chemical References

• Benzhydryl Compounds
• CD44 protein, human
• Hyaluronan Receptors
• Phenols
• Polychlorinated Biphenyls
• bisphenol A
• 3,4,5,3',4'-pentachlorobiphenyl

Topics

• Apoptosis
• Benzhydryl Compounds (toxicity)
• Cell Line, Tumor
• Female
• Humans
• Hyaluronan Receptors
• Neoplastic Stem Cells
• Ovarian Neoplasms (metabolism)
• Phenols (toxicity)
• Polychlorinated Biphenyls (metabolism, toxicity)
• Toxicity Tests
• Wnt Signaling Pathway (drug effects, physiology)