PIWIL2 interacting with IKK to regulate autophagy and apoptosis in esophageal squamous cell carcinoma.

PIWIL2 interacting with IKK to regulate autophagy and apoptosis in esophageal squamous cell carcinoma.
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DOI:
10.1038/s41418-020-00725-4
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发表时间:
2021-06
影响因子:
12.4
通讯作者:
Ma Y
Ma Y
中科院分区:
生物学1区
文献类型:
--
作者:
Zhao X;Huang L;Lu Y;Jiang W;Song Y;Qiu B;Tao D;Liu Y;Ma Y

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食管鳞状细胞癌(ESCC)是中国最常见的恶性肿瘤之一,也是癌症死亡的主要原因之一。已有研究表明,自噬和凋亡抑制对ESCC细胞的存活至关重要。然而,潜在的机制仍有待澄清。最近,我们发现PIWIL2是一种新的癌睾丸蛋白,在ESCC中高表达,并与患者的高t期和低5年生存率相关。我们进一步的研究表明,PIWIL2可以直接结合IKK并促进其磷酸化,导致i -κB磷酸化,进而导致NF-κB核易位,从而抑制细胞凋亡。同时,PIWIL2竞争性地抑制IKK与TSC1的结合,从而使mTORC1通路失活,从而抑制ULK1磷酸化和自噬的启动。小鼠异种移植模型表明PIWIL2能够以ikk依赖的方式促进ESCC的生长。本研究首次发现PIWIL2可调节ESCC患者的自噬和凋亡,并与预后不良相关,为PIWIL2在肿瘤发生中的作用提供了新的认识。
Esophageal squamous cell carcinoma (ESCC) is one of the most common malignancies and cause of death from cancer in China. Previous studies showed that autophagy and apoptosis inhibition are critical for the survival of ESCC cells. However, the underlying mechanisms remain to be clarified. Recently, we found that PIWIL2, a novel cancer testis protein, is highly expressed in ESCC and associated with high T-stage and poor 5-year survival rate in patients. Our further study showed that PIWIL2 can directly bind to IKK and promote its phosphorylation, leading to phosphorylation of IκB and subsequently nuclear translocation of NF-κB for apoptosis inhibition. Meanwhile, PIWIL2 competitively inhibits binding of IKK to TSC1, and thus deactivate mTORC1 pathway which suppresses ULK1 phosphorylation and initiation of autophagy. The mouse xenograft model suggested that PIWIL2 can promote ESCC growth in an IKK-dependent manner. This present work firstly revealed that PIWIL2 can play a role in regulating autophagy and apoptosis, and is associated with poor prognosis in ESCC patients, providing novel insights into the roles of PIWIL2 in tumorigenesis.
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