Abstract
Cellular senescence is implicated in aging or age-related diseases. Sonic hedgehog (Shh) signaling, an inducer of embryonic development, has recently been demonstrated to inhibit cellular senescence. However, the detailed mechanisms to activate Shh signaling to prevent senescence is not well understood. Here, we demonstrate that Protein arginine methyltransferase 7 (PRMT7) promotes Shh signaling via GLI2 methylation which is critical for suppression of cellular senescence. PRMT7-deficient mouse embryonic fibroblasts (MEFs) exhibited a premature cellular senescence with accompanied increase in the cell cycle inhibitors p16 and p21. PRMT7 depletion results in reduced Shh signaling activity in MEFs while PRMT7 overexpression enhances GLI2-reporter activities that are sensitive to methylation inhibition. PRMT7 interacts with and methylates GLI2 on arginine residues 225 and 227 nearby a binding region of SUFU, a negative regulator of GLI2. This methylation interferes with GLI2-SUFU binding, leading to facilitation of GLI2 nuclear accumulation and Shh signaling. Taken together, these data suggest that PRMT7 induces GLI2 methylation, reducing its binding to SUFU and increasing Shh signaling, ultimately leading to prevention of cellular senescence.
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Acknowledgements
This research was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) (NRF-2016R1A2B2007179; NRF-2017M3A9D8048710; NRF-2016R1A5A2945889; NRF-2019R1A2C2006233) to J.S.K. and (NRF-2018R1D1A1B07041884) to T.A.V.
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T.A.V., H.J.J., B.K.K., Y.E.L. contributed to the experimental design, research and data analysis. T.A.V., H.C. and J.S.K. wrote the manuscript.
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Vuong, T.A., Jeong, HJ., Lee, HJ. et al. PRMT7 methylates and suppresses GLI2 binding to SUFU thereby promoting its activation. Cell Death Differ 27, 15–28 (2020). https://doi.org/10.1038/s41418-019-0334-5
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DOI: https://doi.org/10.1038/s41418-019-0334-5
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