Melanoma antigen gene family A as a molecular marker of gastric and colorectal cancers

Lee,Tae-Bum; Lim,Sung-Chul; Moon,Young-Sook; Choi,Cheol-Hee

doi:10.3892/or.2013.2458

Melanoma antigen gene family A as a molecular marker of gastric and colorectal cancers

Authors:
- Tae-Bum Lee
- Sung-Chul Lim
- Young-Sook Moon
- Cheol-Hee Choi
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Affiliations: Research Center for Resistant Cells, Chosun University, Gwangju 501-759, Republic of Korea, Department of Pathology, Chosun University Medical School, Gwangju 501-759, Republic of Korea, Department of Pharmacology, Chosun University Medical School, Gwangju 501-759, Republic of Korea
Published online on: May 14, 2013 https://doi.org/10.3892/or.2013.2458
Pages: 234-238

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Abstract

The present study aimed to evaluate the role of melanoma antigen family A (MAGEA) in gastric and colorectal cancer cell lines and clinical tissue samples. we used 10 gastric and 9 colorectal cancer cell lines, 20 early-stage and 21 advanced-stage gastric cancer tissues, 20 colon adenomas and 19 colorectal cancer tissues. Real-time RT-PCR assay was used for the determination of MAGEA mRNA levels. Western blot analysis and immunohistochemistry were used for the determination of MAGEA protein levels in cell lines and tissues, respectively. Gastric and colorectal cancer cell lines showed variable mRNA expression levels of MAGEA. The MAGEA protein was detected in 30% of gastric cancer cell lines and in 22.2% of colorectal cancer cell lines. There was a high correlation between mRNA and protein expression. Regarding the clinical samples, MAGEA expression was noted in 25, 28.6 and 31.6%, respectively in early-stage, advanced-stage gastric cancer tissues and colon adenocarcinoma, but was negative in the adjacent normal tissues of the stomach and colon as well as colon adenoma. These results indicate that MAGEA is involved in the carcinogenesis of gastric and colorectal cancer and, therefore, can be used as a diagnostic marker to predict these cancers.

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