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SCF FBXW7 /GSK3β-Mediated GFI1 Degradation Suppresses Proliferation of Gastric Cancer Cells.
Cancer Research 2019 September 2
Gastric cancer is the third leading cause of cancer-related death worldwide. The regulatory mechanisms underlying gastric cancer cell proliferation are largely unclear. Here, we show that the transcription factor GFI1 is associated with advanced clinical gastric cancer progression and promoted gastric cancer cell proliferation partially through inhibition of gastrokine-2 (GKN2) transcription. GFI1 was a degrading substrate of FBXW7, whose loss was observed in gastric cancer. Mechanistically, GSK3β-mediated GFI1 S94/S98 phosphorylation triggered its interaction with FBXW7, resulting in SCFFBXW7-mediated ubiquitination and degradation. A nondegradable GFI1 S94A/S98A mutant was more potent in driving gastric cancer cell proliferation and tumorigenesis than wild-type GFI1. Overall, this study reveals the oncogenic role of GFI1 in gastric cancer and provides mechanistic insights into the tumor suppressor function of FBXW7. SIGNIFICANCE: These findings demonstrate the oncogenic role of the transcription factor GFI1 and the tumor suppressive function of FBXW7 in gastric cancer.
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