Journal Article

MicroRNA-34a inhibits migration and invasion of colon cancer cells via targeting to Fra-1

Jianmin Wu, Gang Wu, Lu Lv, Yong-Feng Ren, Xue-Jiao Zhang, Yong-Feng Xue, Guiling Li, Xincheng Lu, ZhongSheng Sun and Kai-Fu Tang

in Carcinogenesis

Volume 33, issue 3, pages 519-528
Published in print March 2012 | ISSN: 0143-3334
Published online December 2011 | e-ISSN: 1460-2180 | DOI:
MicroRNA-34a inhibits migration and invasion of colon cancer cells via targeting to Fra-1

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MicroRNA-34a (miR-34a), a transcriptional target of p53, is a well-known tumor suppressor gene. Here, we identified Fra-1 as a new target of miR-34a and demonstrated that miR-34a inhibits Fra-1 expression at both protein and messenger RNA levels. In addition, we found that p53 indirectly regulates Fra-1 expression via a miR-34a-dependant manner in colon cancer cells. Overexpression of miR-34a strongly inhibited colon cancer cell migration and invasion, which can be partially rescued by forced expression of the Fra-1 transcript lacking the 3′-untranslated region. The expression of matrix metalloproteinase (MMP)-1 and MMP-9, two enzymes involved in cell migration and invasion, was decreased in miR-34a-transfected cells, and this can be rescued by Fra-1 overexpression. Moreover, we found that miR-34a was downregulated in 25 of 40 (62.5%) colon cancer tissues, as compared with the adjacent normal colon tissues and that the expression of miR-34a was correlated with the DNA-binding activity of p53. Unexpectedly, the DNA-binding activity of p53 was not inversely correlated with Fra-1 expression, and a significant statistical inverse correlation between miR-34a and Fra-1 expression was only observed in 14 of 40 (35%) colon cancer tissues. Taken together, our in vitro data suggest that p53 regulates Fra-1 expression, and eventually cell migration/invasion, via a miR-34a-dependent manner. However, in vivo data indicate that the p53-miR-34a pathway is not the major regulator of Fra-1 expression in human colon cancer tissues.

Journal Article.  6012 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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