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Journal of Translational Medicine
Published in: Journal of Translational Medicine 1/2012

Open Access 01-12-2012 | Research

Expression of AEG-1 mRNA and protein in colorectal cancer patients and colon cancer cell lines

Authors: Sebastian Gnosa, Yang-Mei Shen, Chao-Jie Wang, Hong Zhang, Johannes Stratmann, Gunnar Arbman, Xiao-Feng Sun

Published in: Journal of Translational Medicine | Issue 1/2012

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Abstract

Background

Astrocyte elevated gene 1 (AEG-1), an important oncogene, has been shown to be overexpressed in several types of cancers. In colorectal cancer (CRC), the protein level of AEG-1 is up-regulated in tumour tissue compared to normal mucosa, showing prognostic significance. Since little is known about the transcriptional level of AEG-1 expression and its biological pathway in CRC the aim of the present study was to examine the relationship of AEG-1 mRNA expression, the protein level and clinicopathological variables as well as its biology pathway in CRC.

Material and methods

The mRNA expression of AEG-1 was analysed by qPCR in fresh frozen patient samples including 156 primary tumours, along with the corresponding normal mucosa, and in five colon cancer cell lines, SW480, SW620, KM12C, KM12SM and KM12L4a. AEG-1 protein expression was investigated by immunohistochemistry in paraffin-embedded materials from 74 distant normal mucosa, 107 adjacent mucosa, 158 primary tumour, 35 lymph node metastasis and 9 liver metastasis samples. In addition, the AEG-1 protein expression was elucidated in the cell lines by Western blot.

Results

The lymph node metastatic cell line SW620 had a significantly higher AEG-1 mRNA (0.27 ± 0.02) expression compared to the primary tumour cell line SW480 (0.17 ± 0.04, p = 0.026). AEG-1 expression at the mRNA level and/or the protein level was significantly up-regulated gradually from normal mucosa to primary CRC, and then to lymph node metastasis and finally to liver metastasis (p < 0.05). There were significant associations of AEG-1 mRNA expression with tumour location (p = 0.047), as well as mRNA and protein expression with the tumour stage (p < 0.03). Furthermore AEG-1 protein expression was positively related to biological variables including NF-κB, p73, Rad50 and apoptosis (p < 0.05).

Conclusion

AEG-1 is up-regulated, at the mRNA and the protein level, during CRC development and aggressiveness, and is related to tumour location and stage. It may play its role in CRC through the NF-κB signaling pathway.
Appendix
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Metadata
Title
Expression of AEG-1 mRNA and protein in colorectal cancer patients and colon cancer cell lines
Authors
Sebastian Gnosa
Yang-Mei Shen
Chao-Jie Wang
Hong Zhang
Johannes Stratmann
Gunnar Arbman
Xiao-Feng Sun
Publication date
01-12-2012
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2012
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/1479-5876-10-109

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