PDL1 Signals through Conserved Sequence Motifs to Overcome Interferon-Mediated Cytotoxicity

Maria Gato-Cañas, Miren Zuazo, Hugo Arasanz, Maria Ibañez-Vea, Laura Lorenzo, Gonzalo Fernandez-Hinojal, Ruth Vera, Cristian Smerdou, Eva Martisova, Imanol Arozarena, Claudia Wellbrock, Diana Llopiz, Marta Ruiz, Pablo Sarobe, Karine Breckpot, Grazyna Kochan*, David Escors

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

PDL1 blockade produces remarkable clinical responses, thought to occur by T cell reactivation through prevention of PDL1-PD1 T cell inhibitory interactions. Here, we find that PDL1 cell-intrinsic signaling protects cancer cells from interferon (IFN) cytotoxicity and accelerates tumor progression. PDL1 inhibited IFN signal transduction through a conserved class of sequence motifs that mediate crosstalk with IFN signaling. Abrogation of PDL1 expression or antibody-mediated PDL1 blockade strongly sensitized cancer cells to IFN cytotoxicity through a STAT3/caspase-7-dependent pathway. Moreover, somatic mutations found in human carcinomas within these PDL1 sequence motifs disrupted motif regulation, resulting in PDL1 molecules with enhanced protective activities from type I and type II IFN cytotoxicity. Overall, our results reveal a mode of action of PDL1 in cancer cells as a first line of defense against IFN cytotoxicity.

Original languageEnglish
Pages (from-to)1818-1829
Number of pages12
JournalCell Reports
Volume20
Issue number8
Early online date23 Aug 2017
DOIs
Publication statusPublished - 2017

Keywords

  • B7-H1
  • CD274
  • immunotherapy
  • interferon
  • PD-L1
  • PD1
  • PDL1
  • signal transduction

Research Beacons, Institutes and Platforms

  • Manchester Cancer Research Centre

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