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Overexpression of Axin Downregulates TCF-4 and Inhibits the Development of Lung Cancer

  • Thoracic Oncology
  • Original Papers
  • Published:
Annals of Surgical Oncology Aims and scope Submit manuscript

Abstract

Background

T cell factor 4 (TCF-4) mediates a nuclear response to wingless/int (Wnt) signals by interacting with β-catenin. Axis inhibition protein (axin) is an important negative regulator of the Wnt signaling pathway. Our aims were to examine the relationship between axin and TCF-4 and to explore the effects of axin on the development of lung cancer.

Methods

Expression levels of axin and TCF-4 were examined in 107 lung cancer specimens by immunohistochemistry. The axin gene was transfected into lung cancer BE1 cells. The expression levels of axin, β-catenin, and TCF-4 were detected with immunofluorescence and reverse transcription-polymerase chain reaction (RT-PCR) experiments. Apoptosis, proliferation, and the invasive ability of lung cancer cells were examined using flow cytometry, 3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium Bromide (MTT), and Matrigel invasive assays.

Results

Preserved axin expression correlated negatively with TCF-4 expression (P = .031). Axin expression differed with respect to degree of differentiation (P = .025) and histological tumor type (P = .031). TCF-4 expression differed relative to tumor, node metastasis (TNM) stage (P = .024). BE1 cells transfected with axin (BE1-axin cells) exhibited a significant decrease in TCF-4 expression. The level of apoptosis in BE1-axin cells was significantly increased, while the proliferative and invasive abilities of BE1-axin cells were decreased.

Conclusion

These results suggest that reduced expression of axin or augmented expression of TCF-4 is associated with the malignant behavior of lung cancers. Overexpression of axin can downregulate expression of TCF-4 and can inhibit the ability of lung cancer cells to proliferate and invade.

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ACKNOWLEDGMENTS

We thank Dr. Jie Zheng at Medical College of Beijing University, China for providing lung cancer BE1 cell lines. We also thank Professor Mark A. Perrella at Brigham & Women’s Hospital, Boston, MA, USA for kindly providing axin expression vector pFLAG-CMV-5b-axin containing mouse axin1 gene.

This study was supported by National Natural Science Foundation of China (Grants 30470764 and 30670917 to E.-H. Wang) and Doctoral Fund of Ministry of Education of China (No.[2004]165 to E.-H. Wang).

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Correspondence to En-Hua Wang MD, PhD.

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Xu, HT., Wei, Q., Liu, Y. et al. Overexpression of Axin Downregulates TCF-4 and Inhibits the Development of Lung Cancer. Ann Surg Oncol 14, 3251–3259 (2007). https://doi.org/10.1245/s10434-007-9555-9

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  • DOI: https://doi.org/10.1245/s10434-007-9555-9

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