期刊
ONCOGENE
卷 37, 期 9, 页码 1251-1262出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41388-017-0025-y
关键词
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资金
- KRIBB Initiative Program [KGM4751713]
- National Research Foundation (NRF) [2017R1A2B2011936, 2017M3A9F9030565]
- Health Technology RD [HI13C2162]
- National Research Foundation of Korea [2017M3A9F9030565, 2017R1A2B2011936] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
DNA damage-induced apoptosis suppressor (DDIAS) has an anti-apoptotic function during DNA damage in lung cancer. However, the anti-apoptotic mechanism of DDIAS in cancer cells under other conditions has not been reported. We report here that DDIAS protects cancer cells from tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)-induced apoptosis by two distinct mechanisms in non-small cell lung cancer (NSCLC) and hepatocellular carcinoma (HCC) cells. DDIAS depletion sensitized NSCLC and HCC cells to TRAIL-mediated apoptosis, an effect that was abrogated by pharmacological or genetic inhibition of caspase-8 and was independent of caspase-9, p53, or mitogen-activated protein kinase signaling. Interestingly, we found that the N terminus of DDIAS interacted with the death effector domain of Fas-associated protein death domain (FADD) and prevented its recruitment to the death-inducing signaling complex (DISC), thereby blocking caspase-8 activation. DDIAS knockdown also suppressed epidermal growth factor-induced phosphorylation of p90 ribosomal S6 kinase (RSK) 2 and stabilized caspase-8 by preventing its ubiquitination and proteasomal degradation. This effect was abolished by RSK2 overexpression. Taken together, DDIAS has dual functions in inhibiting DISC formation as well as in destabilizing caspase-8, thereby suppressing TRAIL-mediated apoptosis of cancer cells. Thus, we suggest that DDIAS can serve as an effective therapeutic target in the treatment of NSCLC and HCC.
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