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37-kDa laminin receptor precursor promotes lung adenocarcinoma cell invasion and metastasis by epithelial-to-mesenchymal transition

Cancer Gene Therapy volume 21, pages 150–157 (2014)Cite this article

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Abstract

37-kDa laminin receptor precursor (37LRP) has a crucial role in migration of some human cancers. Epithelial-to-mesenchymal transition (EMT) has received much attention in invasion and metastasis of lung cancer. Nevertheless, the role of 37LRP is not entirely clear in EMT promotion of lung cancer at present. In this study, we firstly examined the possible role of 37LRP in the invasiveness and metastasis process of lung cancer using immunohistochemistry of 80 lung adenocarcinoma cases, western blot and real-time PCR of 12 fresh lung adenocarcinoma tissues. The results showed that 37LRP significantly correlated with clinical stage and were highly expressed in metastatic lung adenocarcinomas compared with nonmetastatic ones. In vitro, we observed that 37LRP significantly increased the adhesive, invasive and metastatic abilities of human lung adenocarcinoma cell lines A549 by 37LRP-lentivirus interference. Furthermore, inoculation of A549 cells transduced with 37LRP-lentivirus in nude mice resulted in multi-metastases including the lung. In addition, western blotting and immunofluorescence were used to detect the significant difference in expression of E-cadherin and fibronectin in A549 by 37LRP-lentivirus interference compared with 37LRP-small interference RNA-lentivirus interference in vitro and vivo. The data indicated that A549 cells of epithelial cell characteristics might be induced to undergo EMT by 37LRP. A549 cells transduced with 37LRP-lentivirus showed marked morphological changes, accompanied by the decrease of epithelial marker E-cadherin and the increase of mesenchymal marker fibronectin. These results indicated that 37LRP may promote lung adenocarcinoma invasion and metastasis via the mechanism of EMT.

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Acknowledgements

Tissue collection was supported by the Department of Pathology and General Surgery of Xijing Hospital in Xi’an, China. This work was supported by the National Nature Science Foundation of China (grant numbers: 30971338, 81101765 and 30901752).

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Author notes

  1. Y Wang, H Dong, M Xu and B Xin: These four authors contributed equally to this work.

Authors and Affiliations

  1. Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi’an, China

    Y Wang, H Dong, W Niu, D Xu, P Zhao, B Zhang & Z Li

  2. People’s Liberation Army 88 Hospital, Tai’an, China

    M Xu & B Xin

  3. Department of Oncology, Tangdu Hospital, Fourth Military Medical University, Xi’an, China

    L Liu

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  1. Y Wang
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Correspondence to Z Li or L Liu.

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Wang, Y., Dong, H., Xu, M. et al. 37-kDa laminin receptor precursor promotes lung adenocarcinoma cell invasion and metastasis by epithelial-to-mesenchymal transition. Cancer Gene Ther 21, 150–157 (2014). https://doi.org/10.1038/cgt.2014.10

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