STING-mediated degradation of IFI16 negatively regulates apoptosis by inhibiting p53 phosphorylation at serine 392.
STING-mediated degradation of IFI16 negatively regulates apoptosis by inhibiting p53 phosphorylation at serine 392.
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STING 介导的 IFI16 降解通过抑制 p53 丝氨酸 392 磷酸化来负向调节细胞凋亡
DOI:
10.1016/j.jbc.2021.100930
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发表时间:
2021-08
期刊:
影响因子:
--
通讯作者:
Ma F
中科院分区:
文献类型:
--
作者:
Li D;Xie L;Qiao Z;Mai S;Zhu J;Zhang F;Chen S;Li L;Shen F;Qin Y;Yao H;He S;Ma F
Interferon-γ–inducible factor 16 (IFI16) triggers stimulator of interferon (IFN) genes (STING)–dependent type I IFN production during host antiviral immunity and facilitates p53-dependent apoptosis during suppressing tumorigenesis. We have previously reported that STING-mediated IFI16 degradation negatively regulates type I IFN production. However, it is unknown whether STING also suppresses IFI16/p53-dependent apoptosis via degradation of IFI16. Here, our results from flow cytometry apoptosis detection and immunoblot assays show that IFI16 and nutlin-3, a p53 pathway activator, synergistically induce apoptosis in U2OS and A549 cells. Protein kinase R–triggered phosphorylation of p53 at serine 392 is critical for the IFI16-p53–dependent apoptosis. However, overexpression of STING suppresses p53 serine 392 phosphorylation, p53 transcriptional activity, expression of p53 target genes, and p53-dependent mitochondrial depolarization and apoptosis. In summary, our current study demonstrates that STING-mediated IFI16 degradation negatively regulates IFI16-mediated p53-dependent apoptosis in osteosarcoma and non–small cell lung cancer cells, which suggests a protumorigenic role for STING in certain cancer types because of its potent ability to degrade upstream IFI16.
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