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Journal of Hazardous Materials

Journal of Hazardous Materials

IF: 12.2
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Di (2-ethyl-hexyl) phthalate disrupts placental growth in a dual blocking mode

Published:5 January 2022 DOI: 10.1016/j.jhazmat.2021.126815 PMID: 34396966
Cong-Cong Sun, Shuai Zhao, Ling-Luo Chu, Shan-Yu Zhang, Yan-Ling Li, Mei-Fang Sun, Qu-Nan Wang, Yichao Huang, Jun Zhang, Hua Wang, Lan Gao, De-Xiang Xu, Shi-Chen Zhang, Tao Xu, Ling-Li Zhao

Abstract

Di (2-ethyl-hexyl) phthalate (DEHP) is a widely used plasticizer. Maternal DEHP exposure inhibits cell proliferation and reduces placentas size, which associates with fetal growth restriction and adulthood diseases. However, the mechanism of placental cell proliferation inhibition by DEHP remains elusive. This study investigated the effect of DEHP on placental cell proliferation from cell cycle arrest. Utilizing in vitro and in vivo experiments, we investigated cell cycle arrest, DNA double-strand break (DSB) repair, genotoxic stress response, and micronuclei formation. Most DEHP metabolizes to mono (2-Ethylhexyl) phthalate (MEHP) and distributes to organs quickly, so MEHP and DEHP were used in cultured cell and animal experiments, respectively. Here, a double blocking mode for the proliferation inhibition of the placental cell was revealed. One is that the classical DSB repair pathways were suppressed, which arrested the cell cycle at the G2/M phase. The other is that DEHP stimulated an elevated level of progesterone, which blocked the cell cycle at metaphase by disrupting chromosome arrangement. These two sets of events facilitated micronuclei formation and resulted in cell proliferation inhibition. This findings provide a novel mechanistic understanding for DEHP to inhibit placental cell proliferation.

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