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<p>Latent Epstein-Barr Virus (EBV) infection promotes cancers derived from B-lymphocytes and epithelial cells by mechanisms that largely remain unclear. EBV-encoded nuclear antigen 1 (EBNA1) is uniformly expressed in EBV-associated cancers; however, how EBNA1 contributes to cancer progression is not known. The <i>MUC1</i> gene evolved in mammals to protect barrier tissues from viral infections. We report that <i>MUC1</i> is upregulated in EBV-associated gastric cancers (EBVaGCs). Our results demonstrate that EBNA1 and the oncogenic MUC1-C subunit form an auto-regulatory complex that controls expression of EBNA1, MUC1-C and host cellular genes. EBNA1 appropriates MUC1-C to (i) induce DNA methyltransferase (DNMT) expression and DNA methylation, (ii) suppress <i>CDKN1A</i> encoding p21 to promote proliferation, and (iii) upregulate survivin to confer survival. MUC1-C is also co-opted for localization of EBNA1 in chromatin, expression of EBV latency genes and suppression of lytic genes. Targeting MUC1-C thereby induces the switch of EBV latency to activation of the lytic phase. We further demonstrate that MUC1-C is necessary for EBVaGC stem cell (CSC) state as evidenced by regulation of NOTCH stemness genes and self-renewal capacity. These findings and the demonstration that EBV positivity has no significant effect on survival of patients with GCs indicate that EBNA1 exploits MUC1-C to maintain EBV latency and that prolonged activation of MUC1-C in response to chronic EBV infection promotes EBVaGC malignant progression.</p><p></p>

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MUC1-C auto-regulatory complex with EBNA1 is responsible for latent Epstein-Barr virus-associated gastric cancer progression

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月5日

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  • Hiroki Ozawa,
  • Yin Wang,
  • Henry G. Withers,
  • Naoki Haratake,
  • Ayako Nakashoji,
  • Atrayee Bhattacharya,
  • Atsushi Fushimi,
  • Chie Kikutake,
  • Kazuhiro Yamanoi,
  • Shaowen White,
  • Keyi Wang,
  • Tatsuaki Daimon,
  • Keisuke Shigeta,
  • Kazumasa Fukuda,
  • Hirofumi Kawakubo,
  • Yuko Kitagawa,
  • Mark D. Long,
  • Benjamin E. Gewurz,
  • Donald Kufe

摘要

Latent Epstein-Barr Virus (EBV) infection promotes cancers derived from B-lymphocytes and epithelial cells by mechanisms that largely remain unclear. EBV-encoded nuclear antigen 1 (EBNA1) is uniformly expressed in EBV-associated cancers; however, how EBNA1 contributes to cancer progression is not known. The MUC1 gene evolved in mammals to protect barrier tissues from viral infections. We report that MUC1 is upregulated in EBV-associated gastric cancers (EBVaGCs). Our results demonstrate that EBNA1 and the oncogenic MUC1-C subunit form an auto-regulatory complex that controls expression of EBNA1, MUC1-C and host cellular genes. EBNA1 appropriates MUC1-C to (i) induce DNA methyltransferase (DNMT) expression and DNA methylation, (ii) suppress CDKN1A encoding p21 to promote proliferation, and (iii) upregulate survivin to confer survival. MUC1-C is also co-opted for localization of EBNA1 in chromatin, expression of EBV latency genes and suppression of lytic genes. Targeting MUC1-C thereby induces the switch of EBV latency to activation of the lytic phase. We further demonstrate that MUC1-C is necessary for EBVaGC stem cell (CSC) state as evidenced by regulation of NOTCH stemness genes and self-renewal capacity. These findings and the demonstration that EBV positivity has no significant effect on survival of patients with GCs indicate that EBNA1 exploits MUC1-C to maintain EBV latency and that prolonged activation of MUC1-C in response to chronic EBV infection promotes EBVaGC malignant progression.