Cell Reports (Jul 2023)

SMYD3 represses tumor-intrinsic interferon response in HPV-negative squamous cell carcinoma of the head and neck

  • Nupur Nigam,
  • Benjamin Bernard,
  • Samantha Sevilla,
  • Sohyoung Kim,
  • Mohd Saleem Dar,
  • Daniel Tsai,
  • Yvette Robbins,
  • Kyunghee Burkitt,
  • Cem Sievers,
  • Clint T. Allen,
  • Richard L. Bennett,
  • Theophilus T. Tettey,
  • Benjamin Carter,
  • Lorenzo Rinaldi,
  • Mark W. Lingen,
  • Houssein Sater,
  • Elijah F. Edmondson,
  • Arfa Moshiri,
  • Abbas Saeed,
  • Hui Cheng,
  • Xiaolin Luo,
  • Kevin Brennan,
  • Vishal Koparde,
  • Chen Chen,
  • Sudipto Das,
  • Thorkell Andresson,
  • Abdalla Abdelmaksoud,
  • Madhavi Murali,
  • Seiji Sakata,
  • Kengo Takeuchi,
  • Raj Chari,
  • Yusuke Nakamura,
  • Ravindra Uppaluri,
  • John B. Sunwoo,
  • Carter Van Waes,
  • Jonathan D. Licht,
  • Gordon L. Hager,
  • Vassiliki Saloura

Journal volume & issue
Vol. 42, no. 7
p. 112823

Abstract

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Summary: Cancers often display immune escape, but the mechanisms are incompletely understood. Herein, we identify SMYD3 as a mediator of immune escape in human papilloma virus (HPV)-negative head and neck squamous cell carcinoma (HNSCC), an aggressive disease with poor response to immunotherapy with pembrolizumab. SMYD3 depletion induces upregulation of multiple type I interferon (IFN) response and antigen presentation machinery genes in HNSCC cells. Mechanistically, SMYD3 binds to and regulates the transcription of UHRF1, encoding for a reader of H3K9me3, which binds to H3K9me3-enriched promoters of key immune-related genes, recruits DNMT1, and silences their expression. SMYD3 further maintains the repression of immune-related genes through intragenic deposition of H4K20me3. In vivo, Smyd3 depletion induces influx of CD8+ T cells and increases sensitivity to anti-programmed death 1 (PD-1) therapy. SMYD3 overexpression is associated with decreased CD8 T cell infiltration and poor response to neoadjuvant pembrolizumab. These data support combining SMYD3 depletion strategies with checkpoint blockade to overcome anti-PD-1 resistance in HPV-negative HNSCC.

Keywords