2. Academic Validation
  3. Mex3a interacts with LAMA2 to promote lung adenocarcinoma metastasis via PI3K/AKT pathway

Mex3a interacts with LAMA2 to promote lung adenocarcinoma metastasis via PI3K/AKT pathway

  • Cell Death Dis. 2020 Aug 13;11(8):614. doi: 10.1038/s41419-020-02858-3.
Jinghui Liang 1,  Haixia Li  # 2,  Jingyi Han  # 3,  Jin Jiang  # 3,  Jiang Wang  # 4,  Yongmeng Li 3,  Zitong Feng 3,  Renchang Zhao 3,  Zhenguo Sun 3,  Bin Lv 5 6,  Hui Tian 7
Affiliations

Affiliations

  • 1 Department of Thoracic Surgery, Qilu Hospital, Cheeloo College of Medicine, Shandong University, 250012, Jinan, Shandong, China. zuimeidexiaoyu@126.com.
  • 2 School of Basic Medical Sciences of Shandong University, 250012, Jinan, China.
  • 3 Department of Thoracic Surgery, Qilu Hospital, Cheeloo College of Medicine, Shandong University, 250012, Jinan, Shandong, China.
  • 4 Weifang People's Hospital, 261000, Weifang, China.
  • 5 Department of General Surgery, Cheeloo College of Medicine, Shandong University, 250012, Jinan, Shandong, China.
  • 6 School of Medicine, Shandong University, 250012, Jinan, China.
  • 7 Department of Thoracic Surgery, Qilu Hospital, Cheeloo College of Medicine, Shandong University, 250012, Jinan, Shandong, China. tianhuiql@126.com.
  • # Contributed equally.
PMID: 32792503 DOI: 10.1038/s41419-020-02858-3
Abstract

Lung adenocarcinoma (LUAD) is the main subtype of lung Cancer. In this study, we found that RBP Mex3a was significantly upregulated in LUAD tissues and elevated Mex3a expression was associated with poor LUAD prognosis and metastasis. Furthermore, we demonstrated that Mex3a knockdown significantly inhibited LUAD cell migration and invasion in vitro and metastasis in nude mice. Transcriptome Sequencing indicated that Mex3a affected gene expression linked to ECM-receptor interactions, including laminin subunit alpha 2(LAMA2). RNA immunoprecipitation (RIP) assay revealed Mex3a directly bound to LAMA2 mRNA and Mex3a increased the instability of LAMA2 mRNA in LUAD cells. Furthermore, we discovered that LAMA2 was surprisingly downregulated in LUAD and inhibited LUAD metastasis. LAMA2 knockdown partially reverse the decrease of cell migration and invasion caused by Mex3a knockdown. In addition, we found that both Mex3a and LAMA2 could influence PI3K-AKT pathway, which are downstream effectors of the ECM-receptor pathway. Moreover, the reduced activation of PI3K-AKT pathway in caused by Mex3a depletion was rescued by LAMA2 knockdown. In conclusion, we demonstrated that Mex3a downregulates LAMA2 expression to exert a prometastatic role in LUAD. Our study revealed the prognostic and prometastatic effects of Mex3a in LUAD, suggesting that Mex3a can serve as a prognostic biomarker and a target for metastatic therapy.

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