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Nat Cell Biol. 2008 Feb;10(2):202-10. doi: 10.1038/ncb1681. Epub 2008 Jan 13.

The microRNAs miR-373 and miR-520c promote tumour invasion and metastasis.

Author information

1
The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104, USA. qhuang@wistar.org

Abstract

MicroRNAs (miRNAs) are single-stranded, noncoding RNAs that are important in many biological processes. Although the oncogenic and tumour-suppressive functions of several miRNAs have been characterized, the role of miRNAs in mediating tumour metastasis was addressed only recently and still remains largely unexplored. To identify potential metastasis-promoting miRNAs, we set up a genetic screen using a non-metastatic, human breast tumour cell line that was transduced with a miRNA-expression library and subjected to a trans-well migration assay. We found that human miR-373 and miR-520c stimulated cancer cell migration and invasion in vitro and in vivo, and that certain cancer cell lines depend on endogenous miR-373 activity to migrate efficiently. Mechanistically, the migration phenotype of miR-373 and miR-520c can be explained by suppression of CD44. We found significant upregulation of miR-373 in clinical breast cancer metastasis samples that correlated inversely with CD44 expression. Taken together, our findings indicate that miRNAs are involved in tumour migration and invasion, and implicate miR-373 and miR-520c as metastasis-promoting miRNAs.

PMID:
18193036
DOI:
10.1038/ncb1681
[Indexed for MEDLINE]

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