Colorectal cancer (CRC) cells have low or absent tumor cell PD-L1 expression that we previously demonstrated can confer chemotherapy resistance. Here, we demonstrate that PD-L1 depletion enhances JNK activity resulting in increased BimThr116 phosphorylation and its sequestration by MCL-1 and BCL-2. Activated JNK signaling in PD-L1-depeted cells was due to reduced mRNA stability of the CYLD deubiquitinase. PD-L1 was found to compete with the ribonuclease EXOSC10 for binding to CYLD mRNA. Thus, loss of PD-L1 promoted binding and degradation of CYLD mRNA by EXOSC10 which enhanced JNK activity. An irreversible JNK inhibitor (JNK-IN-8) reduced BimThr116 phosphorylation and unsequestered Bim from MCL-1 and BCL-2 to promote apoptosis. In cells lacking PD-L1, treatment with JNK-IN-8, an MCL-1 antagonist (AZD5991), or their combination promoted apoptosis and reduced long-term clonogenic survival by anticancer drugs. Similar effects of the JNK inhibitor on cell viability were observed in CRC organoids with suppression of PD-L1. These data indicate that JNK inhibition may represent a promising strategy to overcome drug resistance in CRC cells with low or absent PD-L1 expression.
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This study was supported, by NCI R01 CA210509-01A1 and Mayo Clinic Center for Biomedical Discovery Pilot Grant Program (both to FAS). LS is supported by the Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China. AP is supported by the Rosztoczy Foundation Hungarian Scholarship Program.
The authors declare no competing interests.
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Sun, L., Patai, Á.V., Hogenson, T.L. et al. Irreversible JNK blockade overcomes PD-L1-mediated resistance to chemotherapy in colorectal cancer. Oncogene 40, 5105–5115 (2021). https://doi.org/10.1038/s41388-021-01910-6