Abstract
Lung cancer is the leading cause of cancer-related deaths, primarily due to distant metastatic disease. Metastatic lung cancer cells can undergo an epithelial-to-mesenchymal transition (EMT) regulated by various transcription factors, including a double-negative feedback loop between the microRNA-200 (miR-200) family and ZEB1, but the precise mechanisms by which ZEB1-dependent EMT promotes malignancy remain largely undefined. Although the cell-intrinsic effects of EMT are important for tumor progression, the reciprocal dynamic crosstalk between mesenchymal cancer cells and the extracellular matrix (ECM) is equally critical in regulating invasion and metastasis. Investigating the collaborative effect of EMT and ECM in the metastatic process reveals increased collagen deposition in metastatic tumor tissues as a direct consequence of amplified collagen gene expression in ZEB1-activated mesenchymal lung cancer cells. In addition, collagen fibers in metastatic lung tumors exhibit greater linearity and organization as a result of collagen crosslinking by the lysyl oxidase (LOX) family of enzymes. Expression of the LOX and LOXL2 isoforms is directly regulated by miR-200 and ZEB1, respectively, and their upregulation in metastatic tumors and mesenchymal cell lines is coordinated to that of collagen. Functionally, LOXL2, as opposed to LOX, is the principal isoform that crosslinks and stabilizes insoluble collagen deposition in tumor tissues. In turn, focal adhesion formation and FAK/SRC signaling is activated in mesenchymal tumor cells by crosslinked collagen in the ECM. Our study is the first to validate direct regulation of LOX and LOXL2 by the miR-200/ZEB1 axis, defines a novel mechanism driving tumor metastasis, delineates collagen as a prognostic marker, and identifies LOXL2 as a potential therapeutic target against tumor progression.
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Acknowledgements
We thank Dr G Goodall (University of Adelaide, Australia) for the kind gift of the pTRIPz-miR-200 expression constructs. We thank Dr M Dickinson (Baylor College of Medicine, Houston, TX, USA) for providing access to the multiphoton microscope for SHG analysis. We would like to thank members of the Gibbons lab for their assistance and critical reading of the manuscript. This work was supported by NCI K08 CA151661 (DLG), an MD Anderson Cancer Center Physician Scientist Award (DLG), Rexanna’s Foundation for Fighting Lung Cancer (DLG) and CPRIT grant RP120713 P2 (DLG and JG-A). DP was supported by a CPRIT Graduate Scholar Training Grant (RP140106). JW and PT are supported by Lung SPORE (P50 CA070907), Cancer Center Support Grant (CCSG CA016672) and Mary K Chapman Foundation. CJC was supported by CPRIT grant RP120713 C2 and NCI grant CA125123. LAB and DLG are R Lee Clark Fellows of the University of Texas MD Anderson Cancer Center, supported by the Jeane F Shelby Scholarship Fund.
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Peng, D., Ungewiss, C., Tong, P. et al. ZEB1 induces LOXL2-mediated collagen stabilization and deposition in the extracellular matrix to drive lung cancer invasion and metastasis. Oncogene 36, 1925–1938 (2017). https://doi.org/10.1038/onc.2016.358
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DOI: https://doi.org/10.1038/onc.2016.358
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