Journal
CHEMOSPHERE
Volume 291, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132767
Keywords
Decabromodiphenyl ether; Hepatotoxicity; Oxidative stress; Intrinsic apoptotic pathway; Ca2+
Categories
Funding
- National Key R&D Program of China [2017YFC1600302]
- Key R&D Program of Jiangxi Province of China [20192ACB60006]
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This study investigated the effects of BDE-209 on mouse liver and revealed that it leads to an imbalance of redox and promotes apoptosis with a mitochondria-dependent manner. BDE-209 induced changes in mitochondrial morphology and increased ER-mitochondrial contact. ER stress was involved in the apoptosis process, and there was overloaded mitochondrial Ca2+ in hepatocytes of BDE-209 treated mice.
Decabromodiphenyl ether (BDE-209) tends to accumulate in lipid-rich tissues and targets the liver since its high lipophilicity. This study aimed to investigate the effects of BDE-209 on mouse liver and reveal the underlying toxicological mechanisms. Here we firstly confirmed that treatment of BDE-209 could lead to an imbalance of redox and promote apoptosis with a mitochondria-dependent manner in mice livers. Next, the transmission electron microscope (TEM) image revealed BDE-209 induced changes in mitochondrial morphology and increased endoplasmic reticulum (ER) - mitochondrial contact. ER stress was involved in the apoptosis process, which was displayed by the enhancive ER stress makers . Finally, from the increased abundance of cellular pivotal Ca2+ signals transducer CaM, activating Ca2+ release channel Sig-1R and IP3R1, and the stronger fluorescence density of mitochondria-specifically Ca2+ labeled probe Rhod-2 in vitro, we summarized that there was overloaded mitochondrial Ca2+ in hepatocytes of BDE-209 treated mice. In conclusion, these results partly illustrated evidence to reveal a potential mechanism of BDE-209-induced hepatoxicity, where oxidative stress induced-ER stress led to the over-release of Ca2+, followed by the overloaded mitochondrial Ca2+, and cell apoptosis initiated. Our findings provided a theoretical basis for further studying.
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