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Epigenetic silencing of miR-520c leads to induced S100A4 expression and its mediated colorectal cancer progression

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Item Type:Article
Title:Epigenetic silencing of miR-520c leads to induced S100A4 expression and its mediated colorectal cancer progression
Creators Name:Mudduluru, G. and Ilm, K. and Fuchs, S. and Stein, U.
Abstract:The S100 calcium-binding protein A4 (S100A4) induces epithelial mesenchymal transition, migration, invasion, angiogenesis and metastasis. Its induced expression in several cancer types correlates with poor prognosis. Apart from the functional and transcriptional regulatory aspects of S100A4, its post-transcriptional regulation is not yet clearly elucidated. In this study, we show that microRNAs (miR) miR-505-5p and miR-520c-3p target the 3'-UTR of S100A4 and inhibits its expression and its mediated migration and invasion. 5-Aza treatment significantly increased miR-520c-3p expression and reduced the S100A4 protein amounts. The upstream promoter region of miR-520c is hypermethylated irrespective of the metastasis status of colorectal cancer (CRC) patient tissues and in all analyzed CRC cell lines. Moreover, in a cohort of CRC patient specimen (n = 59), miR-520c-3p was significantly downregulated. miR-520c-3p stably expressing HCT116 cells showed a reduced metastasis formation in livers after implanting in mice spleen. Taken together, our findings demonstrate that S100A4 is post-transcriptionally regulated by tumor suppressor miRs, miR-505c-5p and miR-520c-3p, and particularly miR-520c-3p expression is epigenetically silenced in CRC.
Keywords:Colorectal Cancer, Metastasis, Epigenetic Regulations, S100A4, MircoRNA, Animals, Mice
Source:Oncotarget
ISSN:1949-2553
Publisher:Impact Journals (U.S.A.)
Volume:8
Number:13
Page Range:21081-21094
Date:28 March 2017
Official Publication:https://doi.org/10.18632/oncotarget.15499
PubMed:View item in PubMed

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