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PELI1 overexpression contributes to pancreatic cancer progression through upregulating ubiquitination-mediated INPP5J degradation.
Cellular Signalling 2024 April 28
Inositol Polyphosphate-5-Phosphatase J (INPP5J), a 5-phosphatase, has been identified as a tumor suppressor in several types of cancer. However, its role in pancreatic cancer (PC) is unknown. We found that the INPP5J expression was markedly lower in PC tissues (n = 50) compared to paired adjacent non-tumor tissues, and the lower INPP5J expression was relevant to a worse prognosis of PC patients. We thus proposed that INPP5J might inhibit PC progression and conducted gain-of- and loss-of-function experiments to test our hypothesis. Our results showed that overexpression of INPP5J inhibited cell proliferation, invasion, migration, and xenografted tumor of PC cells. INPP5J silencing showed the opposite effect. Pellino E3 Ubiquitin Protein Ligase 1 (PELI1) is one of the ubiquitin ligases known to promote ubiquitination of its downstream targets. We found that PELI1 could interact with INPP5J and promote the ubiquitination and degradation of INPP5J. PELI1 overexpression enhanced malignant behaviors of PC cells. However, INPP5J overexpression restored the alterations caused by PELI1 overexpression. In conclusion, the results suggest that INPP5J, decreased by PELI1 through ubiquitination, may promote PC progression. The PELI1-INPP5J axis represents a potential therapeutic targetable node for PC.
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