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World J Gastroenterol. 2009 May 7;15(17):2089-96.

High miR-196a levels promote the oncogenic phenotype of colorectal cancer cells.

Author information

1
First Department of Internal Medicine, Johannes Gutenberg University of Mainz, Langenbeckstrasse 1, 55131 Mainz, Germany. dr_schimanski@yahoo.de

Abstract

AIM:

To analyze the relevance of the microRNA miR-196a for colorectal oncogenesis.

METHODS:

The impact of miR-196a on the restriction targets HoxA7, HoxB8, HoxC8 and HoxD8 was analyzed by reverse transcription polymerase chain reaction (RT-PCR) after transient transfection of SW480 cancer cells. The miR-196a transcription profile in colorectal cancer samples, mucosa samples and diverse cancer cell lines was quantified by RT-PCR. Transiently miR-196a-transfected colorectal cancer cells were used for diverse functional assays in vitro and for a xenograft lung metastasis model in vivo.

RESULTS:

HoxA7, HoxB8, HoxC8 and HoxD8 were restricted by miR-196a in a dose-dependent and gene-specific manner. High levels of miR-196a activated the AKT signaling pathway as indicated by increased phosphorylation of AKT. In addition, high levels of miR-196a promoted cancer cell detachment, migration, invasion and chemosensitivity towards platin derivatives but did not impact on proliferation or apoptosis. Furthermore, miR-196a increased the development of lung metastases in mice after tail vein injection.

CONCLUSION:

miR-196a exerts a pro-oncogenic influence in colorectal cancer.

PMID:
19418581
PMCID:
PMC2678579
[Indexed for MEDLINE]
Free PMC Article
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