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http://dx.doi.org/10.14348/molcells.2019.2441

Up-regulation of Insulin-like Growth Factor Binding Protein-3 Is Associated with Brain Metastasis in Lung Adenocarcinoma  

Yang, Lishi (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Li, Junyang (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Fu, Shaozhi (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Ren, Peirong (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Tang, Juan (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Wang, Na (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Shi, Xiangxiang (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Wu, Jingbo (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Lin, Sheng (Department of Oncology, Affiliated Hospital of Southwest Medical University)
Abstract
The brain is the most common metastatic site of lung adenocarcinoma; however, the mechanism of this selective metastasis remains unclear. We aimed to verify the hypothesis that exposure of tumor cells to the brain microenvironment leads to changes in their gene expression, which promotes their oriented transfer to the brain. A549 and H1299 lung adenocarcinoma cells were exposed to human astrocyte-conditioned medium to simulate the brain microenvironment. Microarray analysis was used to identify differentially expressed genes, which were confirmed by quantitative real-time PCR and western blotting. Knockdown experiments using microRNAs and the overexpression of genes by cell transfection were performed in addition to migration and invasion assays. In vitro findings were confirmed in clinical specimens using immunohistochemistry. We found and confirmed a significant increase in insulin-like growth factor binding protein-3 (IGFBP3) levels. Our results also showed that the up-regulation of IGFBP3 promoted A549 cell epithelial-mesenchymal transition, migration, and invasion, while the knockdown of IGFBP3 resulted in decreased cell motility. We also found that Transforming growth factor-${\beta}$ (TGF-${\beta}$)/Mothers against decapentaplegic homolog 4 (Smad4)-induced epithelial-mesenchymal transition was likely IGFBP3-dependent in A549 cells. Finally, expression of IGFBP3 was significantly elevated in pulmonary cancer tissues and intracranial metastatic tissues. Our data indicate that up-regulation of IGFBP3 might mediate brain metastasis in lung adenocarcinoma, which makes it a potential therapeutic target.
Keywords
brain metastasis; EMT; IGFBP3; lung adenocarcinoma;
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