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Published in: Breast Cancer Research 1/2018

Open Access 01-12-2018 | Research Article

Isocitrate dehydrogenase 1–snail axis dysfunction significantly correlates with breast cancer prognosis and regulates cell invasion ability

Authors: Wen-Shan Liu, Shih-Hsuan Chan, Hong-Tai Chang, Guan-Cheng Li, Ya-Ting Tu, Hui-Hwa Tseng, Ting-Ying Fu, Hui-Yu Chang, Huei-Han Liou, Luo-Ping Ger, Kuo-Wang Tsai

Published in: Breast Cancer Research | Issue 1/2018

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Abstract

Background

The isocitrate dehydrogenase (IDH) gene family expresses key functional metabolic enzymes in the Krebs cycle and mediates the epigenetic reprogramming, which serves as an important biomarker of breast cancer. However, the expression levels of the IDH protein and their biological function in human breast cancer remain largely unknown.

Methods

In this study, the clinical impact of IDH1 expression on the progression and prognosis of breast cancer was evaluated using immunohistochemistry assay (IHC) of the corresponding tumor-adjacent normal, ductal carcinoma in situ (DCIS), and invasive ductal carcinoma (IDC) tissues from 309 patients with breast ductal carcinoma. The relationship between microRNA (miRNA) and IDH1 were examined by a bioinformatics approach, western blot and reporter assay. The biological functions of IDH1 were examined in breast cancer cells with IDH1 knockdown, including proliferation, migration and invasion.

Results

The present findings revealed that the mRNA and protein expression levels of IDH1 were both significantly lower in breast cancer tissues than in adjacent normal tissues. A low expression level of IDH1 in breast cancer significantly correlated with advanced stage (p = 0.012), lymph node metastasis (p = 0.018), and poor disease-specific survival (DSS) (adjusted hazard ratio (AHR), 1.57, 95% confidence interval (CI), 1.08–2.30; p = 0.02). Furthermore, oncogenic miR-32 and miR-92b were identified to suppress IDH1 expression, leading to the inhibition of cell migration and invasion. We further explored whether reduced expression of IDH1 significantly increases snail expression by activating HIFα (hypoxia-inducible factor-1 alpha) and NFκB (nuclear factor kappa B) signaling. Multivariate Cox regression analysis revealed that the combination of low IDH1 and high snail expression could be an independent risk factor for shorter DSS (AHR, 2.34; 95% CI, 1.32–4.16; p = 0.004) and shorter disease-free survival (AHR, 2.50; 95% CI, 1.39–4.50; p = 0.002) in patients with breast cancer.

Conclusion

Our findings revealed that a IDH1low/Snailhigh molecular signature could serve as an independent biomarker for poor prognosis in breast cancer
Appendix
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Metadata
Title
Isocitrate dehydrogenase 1–snail axis dysfunction significantly correlates with breast cancer prognosis and regulates cell invasion ability
Authors
Wen-Shan Liu
Shih-Hsuan Chan
Hong-Tai Chang
Guan-Cheng Li
Ya-Ting Tu
Hui-Hwa Tseng
Ting-Ying Fu
Hui-Yu Chang
Huei-Han Liou
Luo-Ping Ger
Kuo-Wang Tsai
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 1/2018
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/s13058-018-0953-7

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