DDX39B K63-linked ubiquitination mediated by TRIM28 promotes NSCLC metastasis by enhancing ECAD lysosomal degradation

作者：Hang Yuan, Li Qin, Liang Li, Gang Zhao, Jie Zhang, Tianyu Feng, Yafei Guo, Qiming Kou, Siqi Li, Shan Li, Minghui Zhao, Guanru Wang, Qijing Wang, Jie Qu, Huayang Yu, Hongbai Chen, Lunxu Liu, Kai Li, Ping Lin · 发表于：Signal Transduction and Targeted Therapy · 年份：2025 · DOI：10.1038/s41392-025-02305-9 · 被引用次数：12 · 研究领域：Ubiquitin and proteasome pathways、Autophagy in Disease and Therapy、Epigenetics and DNA Methylation

Metastasis is a leading cause of treatment failure and high mortality in non-small cell lung cancer (NSCLC). Recently, we demonstrated that DEAD box helicase 39B (DDX39B) was upregulated and activated metabolic reprogramming in colorectal cancer and hepatocellular carcinoma. However, the function of DDX39B and the therapeutic potential for targeting DDX39B in NSCLC remain unclear. Herein, we discovered that DDX39B was an independent marker for poor survival in NSCLC patients. Strikingly, DDX39B protein, but not its mRNA, was elevated in clinical metastatic brain lesions and metastatic cell models (in vitro EMT-metastatic and in vivo carotid artery injection-induced brain-metastatic cell model). Mechanistically, DDX39B interacted with E3 ubiquitin ligase TRIM28 via Pro322 residue and underwent TRIM28-mediated K63-linked ubiquitination at Lys241, Lys384, and Lys398, leading to DDX39B protein stabilization and upregulation. Subsequently, DDX39B directly bound to ECAD and promoted ECAD lysosomal degradation by recruiting Src and Hakai, which was independent of its RNA helicase activity, followed by activating β-catenin oncogenic signaling and facilitating NSCLC aggressive phenotype. According to structure-based virtual screening, we discovered a clinical antimalarial drug, artesunate, that disrupted the association of DDX39B-TRIM28 complex, resulting in DDX39B degradation and blocking the pro-metastatic effects of DDX39B. Overall, our findings uncover that TRIM28/DDX39B/ECAD axis...