RNF31 inhibition sensitizes tumors to bystander killing by innate and adaptive immune cells

Zhengkui Zhang, Xiangjun Kong, Maarten A. Ligtenberg, Susan E. van Hal-van Veen, Nils L. Visser, Beaunelle de Bruijn, Kelly Stecker, Pim W. van der Helm, Thomas Kuilman, Esmée P. Hoefsmit, David W. Vredevoogd, Georgi Apriamashvili, Beau Baars, Emile E. Voest, Sjoerd Klarenbeek, Maarten Altelaar, Daniel S. Peeper*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Tumor escape mechanisms for immunotherapy include deficiencies in antigen presentation, diminishing adaptive CD8+ T cell antitumor activity. Although innate natural killer (NK) cells are triggered by loss of MHC class I, their response is often inadequate. To increase tumor susceptibility to both innate and adaptive immune elimination, we performed parallel genome-wide CRISPR-Cas9 knockout screens under NK and CD8+ T cell pressure. We identify all components, RNF31, RBCK1, and SHARPIN, of the linear ubiquitination chain assembly complex (LUBAC). Genetic and pharmacologic ablation of RNF31, an E3 ubiquitin ligase, strongly sensitizes cancer cells to NK and CD8+ T cell killing. This occurs in a tumor necrosis factor (TNF)-dependent manner, causing loss of A20 and non-canonical IKK complexes from TNF receptor complex I. A small-molecule RNF31 inhibitor sensitizes colon carcinoma organoids to TNF and greatly enhances bystander killing of MHC antigen-deficient tumor cells. These results merit exploration of RNF31 inhibition as a clinical pharmacological opportunity for immunotherapy-refractory cancers.

Original languageEnglish
Article number100655
Pages (from-to)1-25
JournalCell Reports Medicine
Volume3
Issue number6
DOIs
Publication statusPublished - 21 Jun 2022

Keywords

  • bystander killing
  • function-based genome-wide screens
  • immunotherapy resistance
  • NK cells
  • T cells
  • Tumor Escape
  • Ubiquitination
  • Killer Cells, Natural
  • Tumor Necrosis Factor-alpha/metabolism
  • Ubiquitin-Protein Ligases/genetics

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