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Inorganic arsenic influences cell apoptosis by regulating the expression of MEG3 gene

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Abstract

Arsenic is a wildly distributed carcinogen in the environment. Arsenic-induced apoptosis has been extensively studied in therapeutics and toxicology. LncRNA MEG3 has been extensively studied as apoptosis regulatory gene in recent years. However, it stays unclear regarding how the mechanism of MEG3 regulates arsenic-induced apoptosis. Our focus was to explore the effects of MEG3 on arsenic-induced apoptosis. MTS assay was used to test cell viability, and qRT-PCR was for the examination of gene expressions. The effect of the apoptosis and necrosis after knockdown MEG3 was detected with double staining. Our results demonstrated that MEG3 expression was positively correlated with the concentration of three arsenic species (inorganic arsenic (iAs), monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA)) (p < 0.05). The ability of iAs to induce MEG3 expression was much higher compared with that induced by MMA and DMA. In addition, our experiments confirmed that MEG3 knockdown increased cell viability and arsenic-induced apoptosis, but cell viability decreased after iAs treatment. Moreover, LncRNA MEG3 regulated apoptosis via down-regulate API5 while up-regulate CASP7, CCND3 and APAF1. It is further proved that arsenic-induced apoptosis increased after the knockdown of MEG3, which regulates these genes. These findings provide experimental evidence and possible mechanisms for subsequent research on the effects of arsenic on health.

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Acknowledgements

This work was financially sponsored by the National Natural Science Foundation of China (Grant No. 81860572).

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Authors and Affiliations

  1. School of Public Health, Kunming Medical University, No.1168 Chunrongxi Road Chenggong District, Kunming, Yunnan Province, China

    Mengjie Wang, Jingwen Tan, Chenglan Jiang, Shuting Li, Xinan Wu & Yuefeng He

  2. College of Pharmaceutic Science, Yunnan University of Chinese Medicine, No.1076 Yuhua Road Chenggong District, Kunming, Yunnan Province, China

    Guanghui Ni

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  1. Mengjie Wang
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Correspondence to Guanghui Ni or Yuefeng He.

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Wang, M., Tan, J., Jiang, C. et al. Inorganic arsenic influences cell apoptosis by regulating the expression of MEG3 gene. Environ Geochem Health 43, 475–484 (2021). https://doi.org/10.1007/s10653-020-00740-x

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