Pirin Inhibits FAS-Mediated Apoptosis to Support Colorectal Cancer Survival

Resistance to immunotherapy in colorectal cancer (CRC) is associated with obstruction of FAS (Apo-1 or CD95)-dependent apoptosis, a hallmark of cancer. Here it is demonstrated that the upregulation of pirin (PIR) protein in colon cancers promotes tumorigenesis. Knockout or inhibition of PIR dramatically increases FAS expression, FAS-dependent apoptosis and attenuates colorectal tumor formation in mice. Specifically, NF kappa B2 is a direct transcriptional activator of FAS and robustly suppressed by PIR in dual mechanisms. One is the disruption of NF kappa B2 complex (p52-RELB) association with FAS promoter, the other is the inhibition of NIK-mediated NF kappa B2 activation and nuclear translocation, leading to the inability of active NF kappa B2 complex toward the transcription of FAS. Furthermore, PIR interacts with FAS and recruits it in cytosol, preventing its membrane translocation and assembling. Importantly, knockdown or knockout of PIR dramatically sensitizes cells to FAS mAb- or active CD8(+) T cells-triggered cell death. Taken together, a PIR-NIK-NF kappa B2-FAS survival pathway is established, which plays a key role in supporting CRC survival.