Abstract
YTH N6-methyladenosine RNA binding protein 2 (YTHDF2) undergoes phase separation in response to the stimulation of high concentration of arsenite, suggesting that oxidative stress, the major mechanism of arsenite toxicity, may play a role in YTHDF2 phase separation. However, whether arsenite-induced oxidative stress is involved in phase separation of YTHDF2 has yet to be established. To explore the effect of arsenite-induced oxidative stress on YTHDF2 phase separation, the levels of oxidative stress, YTHDF2 phase separation, and N6-methyladenosine (m6A) in human keratinocytes were detected after exposure to various concentrations of sodium arsenite (0-500 µM; 1 h) and antioxidant N-acetylcysteine (0–10 mM; 2 h). We found that arsenite promoted oxidative stress and YTHDF2 phase separation in a concentration-dependent manner. In contrast, pretreatment with N-acetylcysteine significantly relieved arsenate-induced oxidative stress and inhibited YTHDF2 phase separation. As one of the key factors to YTHDF2 phase separation, N6-methyladenosine (m6A) levels in human keratinocytes were significantly increased after arsenite exposure, accompanied by upregulation of m6A methylesterase levels and downregulation of m6A demethylases levels. On the contrary, N-acetylcysteine mitigated the arsenite-induced increase of m6A and m6A methylesterase and the arsenite-induced decrease in m6A demethylase. Collectively, our study firstly revealed that oxidative stress induced by arsenite plays an important role in YTHDF2 phase separation driven by m6A modification, which provides new insights into the arsenite toxicity from the phase-separation perspective.
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This study was supported by the grant from the National Natural Science Foundation of China (Grant No. 82073510) to Zunzhen Zhang.
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Jin Man, Qian Zhang and Zunzhen Zhang contributed to the study conception and design. Jin Man, Qian Zhang, Tianhe Zhao and Donglei Sun performed the experiments. Weilian Sun and Keyan Long provided help with the experiments and data analysis. The first draft of the manuscript was written by Jin Man and Zunzhen Zhang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Man, J., Zhang, Q., Zhao, T. et al. Oxidative Stress Induced by Arsenite is Involved in YTHDF2 Phase Separation. Biol Trace Elem Res 202, 885–899 (2024). https://doi.org/10.1007/s12011-023-03728-7
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DOI: https://doi.org/10.1007/s12011-023-03728-7