PI3K/AKT/mTOR通路
细胞生物学
蛋白激酶B
流式细胞术
化学
活性氧
细胞毒性
肌动蛋白细胞骨架
细胞迁移
分子生物学
生物
细胞
细胞骨架
信号转导
体外
生物化学
作者
Mengmeng Yao,Xiaoli Ji,Yuqing Zhang,Zhilei Mao,Xia Chi
出处
期刊:Annals of Translational Medicine
[AME Publishing Company]
日期:2022-04-01
卷期号:10 (7): 402-402
被引量:2
摘要
Cerium dioxide nanoparticles (CeO2 NPs) are increasingly used as diesel additive, causing a lot of concern about their toxic effects when released into the atmosphere. To date, there is little knowledge about the toxic effects of CeO2 NPs on the female reproductive system.The morphology and size distribution of CeO2 NPs was observed by transmission electronic microscope (TEM) and Zetasizer Nano, respectively. The uptake of CeO2 NPs by cells was also observed by TEM after treatment. The cytotoxicity of CeO2 NPs was studied by Cell Counting Kit-8 (CCK-8), the cellular invasive and migratory ability was examined by transwell assay, the cell apoptosis and reactive oxygen species (ROS) were studied by flow cytometry (FCM), and the mRNAs and proteins expressions were revealed by quantitative real-time PCR (qRT-PCR) and western blotting. The cytoskeletons and autophagy levels were revealed by immunofluorescence. The target regulation of miR-99 to mammalian target of rapamycin (mTOR) was proved by dual luciferase reporter assay after transfection.We studied the cytotoxic effects of CeO2 NPs on human trophoblastic cells (HTR-8/Svneo) and found that the invasive and migratory abilities of HTR-8/SVneo cells were decreased after CeO2 NPs exposure. Immunofluorescence assays showed that the cellular microtubule networks and microfilament arrangement were obviously altered, and although the expression of cytoskeleton proteins (α-tubulin, β-tubulin, actin) did not change, the protein levels of invasion- and migration-related factors [matrix metalloproteinase 2 (MMP2), protein kinases B (AKT), mTOR] were decreased in exposed cells. Accordingly, the expression level of miR-99 family members (miR-99a, miR-99b, miR-100), which can regulate mTOR, was significantly increased after CeO2 NPs exposure. Dual luciferase reporter assay indicated that the miR-99 family members directly targeted mTOR.CeO2 NPs impaired the invasive and migratory abilities, which play an important role in embryo implantation, as well as determining placental function and embryonic development.
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