Diethyl phthalate enhances expression of SIRT1 and DNMT3a during apoptosis in PC12 cells

Authors

  • Yongkun Sun,

    1. Environmental Adaptation Science, Division of Environmental Science Development, Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
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  • Zhikun Guo,

    1. Key Laboratory for Medical Tissue Regeneration of Henan Province, Xinxiang Medical University, Department of Basic Medicine Xinxiang Medical University, Xinxiang, China
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  • Shouhei Iku,

    1. Key Laboratory for Medical Tissue Regeneration of Henan Province, Xinxiang Medical University, Department of Basic Medicine Xinxiang Medical University, Xinxiang, China
    2. Beijing Academy of Science and Technology, Beijing, China
    3. Jiangsu Alphay Biological Technology Co., Ltd, Nantong, China
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  • Takeshi Saito,

    1. Division of Health Sciences, Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
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  • Masaaki Kurasaki

    Corresponding author
    1. Environmental Adaptation Science, Division of Environmental Science Development, Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
    2. Group of Environmental Adaptation Science, Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan
    • Correspondence to: M. Kurasaki, Group of Environmental Adaptation Science, Faculty of Environmental Earth Science, Hokkaido University, 060–0810 Sapporo, Japan. Email: kura@ees.hokudai.ac.jp

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ABSTRACT

Diethyl phthalate (DEP) works as a phthalate plasticizer and is ubiquitously used in personal care products, cosmetics, medical equipment and pharmaceutical coating. DEP is considered a potential endocrine disruptor. Previously we found DEP-enhanced apoptosis induced by serum deprivation in PC12 cells. However, the relationship between DEP and longevity-related factors, sirtuins and epigenetic factors (e.g. DNA methyltransferases) remains unclear, because genome modification caused by chemical toxicity, sirtuins and epigenetic factors have played key roles in abnormal metabolism and development. Here, we investigate whether DEP affects sirtuins (SIRT1 and SIRT2) and methyltranferases (DNMT1 and DNMT3a) on the apoptosis of PC12 cells. We found that DNMT3a was significantly decreased by serum deprivation. However, DNMT3a, DNMT3b and SIRT1 were significantly increased under the enhancement of apoptosis induced by serum deprivation. These results suggest that SIRT1, DNMT3a and DNMT3b play multiple and complex roles in different apoptotic stages. Our results showed DEP triggered epigenetic factors on PC12 cells apoptosis under nutrition stress. Finally, our results suggest that monitoring epigenetic factors such as DNMT3a, DNMT3b and SIRT1 could be a useful tool for chemical toxicity risk assessment. Copyright © 2012 John Wiley & Sons, Ltd.

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