Notch1 destabilizes the adherens junction complex through upregulation of the Snail family of E-cadherin repressors in non-small cell lung cancer

Kim,Arum; Kim,Eun  Young; Cho,Eun  Na; Kim,Hyung Jung; Kim,Se  Kyu; Chang,Joon; Ahn,Chul  Min; Chang,Yoon  Soo

doi:10.3892/or.2013.2565

Notch1 destabilizes the adherens junction complex through upregulation of the Snail family of E-cadherin repressors in non-small cell lung cancer

Authors:
- Arum Kim
- Eun Young Kim
- Eun Na Cho
- Hyung Jung Kim
- Se Kyu Kim
- Joon Chang
- Chul Min Ahn
- Yoon Soo Chang
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Affiliations: Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
Published online on: June 26, 2013 https://doi.org/10.3892/or.2013.2565
Pages: 1423-1429

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Abstract

One of the critical steps driving cancer cell migration and metastasis is the repression of cell adhesion molecules resulting in loss of cell‑to-cell adhesion. Although interactions between Notch1 and components of the adherens junction complex have been suggested, little is known concerning the consequence of their interactions. In this study, we investigated the interaction between the Notch1 and the E‑cadherin/β‑catenin complex, its effect on the expression of adherens junction complex components and its influence on non-small cell lung cancer (NSCLC) cell proliferation. With progression of lung neoplastic lesions in LSL K-ras G12D mice, the expression of E‑cadherin was inhibited whereas that of Notch1 was increased with frequent nuclear localization, suggesting an inverse relationship between E‑cadherin and Notch1 expression with tumor progression. Transduction of the human Notch1 intracellular domain (N1ICD) into NSCLC cells inhibited expression of E‑cadherin and β‑catenin and induced changes in the localization of adherens junction molecules. The loss of E‑cadherin was mediated through upregulation of the Snail family of transcription factors, Snail and Slug. Experiments in which siRNA against E-cadherin was introduced into NSCLC cells revealed that N1ICD decreased the expression of β‑catenin in an E‑cadherin‑independent manner, leading to inhibition of markers of Wnt/β‑catenin signaling activation. Despite inhibition of Wnt/β‑catenin signaling in the N1ICD‑transduced cells, cells transduced with N1ICD showed no difference in cell cycle progression when compared with that of the control vector-transduced cells. In conclusion, Notch1 inhibited the expression of E‑cadherin through upregulation of the Snail family of transcriptional factors, resulting in inhibition of expression of β‑catenin and destabilization of adherens junctions.

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