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 language | English |
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Pages (from-to) | 1818-1829 |
Number of pages | 12 |
Journal | Cell Reports |
Volume | 20 |
Issue number | 8 |
Early online date | 23 Aug 2017 |
DOIs | |
Publication status | Published - 2017 |
Keywords
- B7-H1
- CD274
- immunotherapy
- interferon
- PD-L1
- PD1
- PDL1
- signal transduction
Research Beacons, Institutes and Platforms
- Manchester Cancer Research Centre