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Int. J. Mol. Sci. 2015, 16(1), 1526-1543; doi:10.3390/ijms16011526

Relationship between Expression of Onco-Related miRNAs and the Endoscopic Appearance of Colorectal Tumors

1
Department of Gastroenterology, School of Medicine, Fujita Health University, Kutsukake-cho, Aichi 470-1192, Japan
2
The United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu 501-1193, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: William Chi-shing Cho
Received: 3 October 2014 / Accepted: 25 December 2014 / Published: 9 January 2015
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
View Full-Text   |   Download PDF [3710 KB, uploaded 9 January 2015]   |  

Abstract

Accumulating data indicates that certain microRNAs (miRNAs or miRs) are differently expressed in samples of tumors and paired non-tumorous samples taken from the same patients with colorectal tumors. We examined the expression of onco-related miRNAs in 131 sporadic exophytic adenomas or early cancers and in 52 sporadic flat elevated adenomas or early cancers to clarify the relationship between the expression of the miRNAs and the endoscopic morphological appearance of the colorectal tumors. The expression levels of miR-143, -145, and -34a were significantly reduced in most of the exophytic tumors compared with those in the flat elevated ones. In type 2 cancers, the miRNA expression profile was very similar to that of the exophytic tumors. The expression levels of miR-7 and -21 were significantly up-regulated in some flat elevated adenomas compared with those in exophytic adenomas. In contrast, in most of the miR-143 and -145 down-regulated cases of the adenoma-carcinoma sequence and in some of the de novo types of carcinoma, the up-regulation of oncogenic miR-7 and/or -21 contributed to the triggering mechanism leading to the carcinogenetic process. These findings indicated that the expression of onco-related miRNA was associated with the morphological appearance of colorectal tumors. View Full-Text
Keywords: microRNA; endoscopic appearance; colorectal tumor microRNA; endoscopic appearance; colorectal tumor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nakagawa, Y.; Akao, Y.; Taniguchi, K.; Kamatani, A.; Tahara, T.; Kamano, T.; Nakano, N.; Komura, N.; Ikuno, H.; Ohmori, T.; Jodai, Y.; Miyata, M.; Nagasaka, M.; Shibata, T.; Ohmiya, N.; Hirata, I. Relationship between Expression of Onco-Related miRNAs and the Endoscopic Appearance of Colorectal Tumors. Int. J. Mol. Sci. 2015, 16, 1526-1543.

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