Author:
Lin Jian-Xian,Xie Xin-Sheng,Weng Xiong-Feng,Qiu Sheng-Liang,Yoon Changhwan,Lian Ning-Zi,Xie Jian-Wei,Wang Jia-Bin,Lu Jun,Chen Qi-Yue,Cao Long-Long,Lin Mi,Tu Ru-Hong,Yang Ying-Hong,Huang Chang-Ming,Zheng Chao-Hui,Li Ping
Abstract
Abstract
Background
UFM1 has been found to be involved in the regulation of tumor development. This study aims to clarify the role and potential molecular mechanisms of UFM1 in the invasion and metastasis of gastric cancer.
Methods
Expression of UFM1 in gastric tumor and paired adjacent noncancerous tissues from 437 patients was analyzed by Western blotting, immunohistochemistry, and realtime PCR. Its correlation with the clinicopathological characteristics and prognosis of gastric cancer patients was analyzed. The effects of UFM1 on the invasion and migration of gastric cancer cells were determined by the wound and trans-well assays, and the effect of UFM1 on subcutaneous tumor formation was verified in nude mice. The potential downstream targets of UFM1 and related molecular mechanisms were clarified by the human protein kinase assay and co-immunoprecipitation technique.
Results
Compared with the corresponding adjacent tissues, the transcription level and protein expression level of UFM1 in gastric cancer tissues were significantly downregulated (P < 0.05). The 5-year survival rate of gastric cancer patients with low UFM1 expression was significantly lower than the patients with high UFM1 expression (42.1% vs 63.0%, P < 0.05). The invasion and migration abilities of gastric cancer cells with stable UFM1 overexpression were significantly decreased, and the gastric cancer cells with UFM1 stable knockdown showed the opposite results; similar results were also obtained in the nude mouse model. Further studies have revealed that UFM1 could increase the ubiquitination level of PDK1 and decrease the expression of PDK1 at protein level, thereby inhibiting the phosphorylation level of AKT at Ser473. Additionally, the effect of UFM1 on gastric cancer cell function is dependent on the expression of PDK1. The expression level of UFM1 can improve the poor prognosis of PDK1 in patients with gastric cancer.
Conclusion
UFM1 suppresses the invasion and metastasis of gastric cancer by increasing the ubiquitination of PDK1 through negatively regulating PI3K/AKT signaling.
Funder
National Natural Science Foundation of China
Science Foundation of the Fujian Province
Startup Fund for Scientific Research
Scientific and Technological Innovation Joint Capital Projects of Fujian Province
Minimally Invasive Medical Center of Fujian Province
the Science Foundation of Fujian Province
Publisher
Springer Science and Business Media LLC
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