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

Cell Rep. 2023 Jul 25;42(7):112823. doi: 10.1016/j.celrep.2023.112823. Epub 2023 Jul 17.

Abstract

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: CP: Cancer; CP: Immunology; SMYD3; antitumor immune response; head and neck cancer; interferon response.

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • CCAAT-Enhancer-Binding Proteins
  • CD8-Positive T-Lymphocytes
  • Head and Neck Neoplasms* / drug therapy
  • Head and Neck Neoplasms* / genetics
  • Histone-Lysine N-Methyltransferase* / genetics
  • Humans
  • Interferon Type I*
  • Papillomavirus Infections*
  • Squamous Cell Carcinoma of Head and Neck* / drug therapy
  • Squamous Cell Carcinoma of Head and Neck* / genetics
  • Ubiquitin-Protein Ligases

Substances

  • CCAAT-Enhancer-Binding Proteins
  • Histone-Lysine N-Methyltransferase
  • Interferon Type I
  • SMYD3 protein, human
  • Ubiquitin-Protein Ligases
  • UHRF1 protein, human