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Foxa2 and Cdx2 cooperate with Nkx2-1 to inhibit lung adenocarcinoma metastasis
Carman Man-Chung Li1, Vasilena Gocheva1, Madeleine J Oudin1
1David H. Koch Institute for Integrative Cancer Research, Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;
Abstract:
Despite the fact that the majority of lung cancer deaths are due to metastasis, the molecular mechanisms driving metastatic progression are poorly understood. Here, we present evidence that loss of Foxa2 and Cdx2 synergizes with loss of Nkx2-1 to fully activate the metastatic program. These three lineage-specific transcription factors are consistently down-regulated in metastatic cells compared with nonmetastatic cells. Knockdown of these three factors acts synergistically and is sufficient to promote the metastatic potential of nonmetastatic cells to that of naturally arising metastatic cells in vivo. Furthermore, silencing of these three transcription factors is sufficient to account for a significant fraction of the gene expression differences between the nonmetastatic and metastatic states in lung adenocarcinoma, including up-regulated expression of the invadopodia component Tks5long, the embryonal proto-oncogene Hmga2, and the epithelial-to-mesenchymal mediator Snail. Finally, analyses of tumors from a genetically engineered mouse model and patients show that low expression of Nkx2-1, Foxa2, and Cdx2 strongly correlates with more advanced tumors and worse survival. Our findings reveal that a large part of the complex transcriptional network in metastasis can be controlled by a small number of regulatory nodes that function redundantly, and loss of multiple nodes is required to fully activate the metastatic program.
Insights
Loss of three key transcription factors—Nkx2-1, Foxa2, and Cdx2—drives lung cancer metastasis. Reduced expression of these factors in lung adenocarcinoma correlates with advanced disease and poor survival, revealing critical regulatory nodes in cancer progression.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Lung cancer metastasis is a major cause of mortality, yet its underlying molecular mechanisms remain largely unknown.
- Understanding the drivers of metastatic progression is crucial for developing effective therapeutic strategies.
Purpose of the Study:
- To investigate the role of specific transcription factors in the activation of the metastatic program in lung cancer.
- To identify key regulatory nodes controlling gene expression differences between nonmetastatic and metastatic lung adenocarcinoma cells.
Main Methods:
- Investigated the synergistic effect of down-regulating Foxa2, Cdx2, and Nkx2-1 on metastatic potential in lung cancer cells.
- Utilized in vivo models and gene expression analysis to assess the impact of transcription factor knockdown.
- Correlated the expression levels of Nkx2-1, Foxa2, and Cdx2 with tumor stage and patient survival data.
Main Results:
- Simultaneous loss of Foxa2, Cdx2, and Nkx2 synergistically promotes the metastatic potential of nonmetastatic lung cancer cells.
- Silencing these transcription factors significantly alters gene expression, including upregulation of Tks5long, Hmga2, and Snail.
- Low expression of Nkx2-1, Foxa2, and Cdx2 strongly correlates with advanced tumor stages and reduced survival in both mouse models and human patients.
Conclusions:
- A small set of transcription factors (Nkx2-1, Foxa2, Cdx2) act as critical regulatory nodes controlling the metastatic program in lung cancer.
- Redundant function of these factors means that loss of multiple nodes is required to fully activate metastasis.
- These findings highlight the importance of these transcription factors as potential therapeutic targets for lung cancer metastasis.
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