Impaired microRNA processing enhances cellular transformation and tumorigenesis View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2007-05

AUTHORS

Madhu S Kumar, Jun Lu, Kim L Mercer, Todd R Golub, Tyler Jacks

ABSTRACT

MicroRNAs (miRNAs) are a new class of small noncoding RNAs that post-transcriptionally regulate the expression of target mRNA transcripts. Many of these target mRNA transcripts are involved in proliferation, differentiation and apoptosis, processes commonly altered during tumorigenesis. Recent work has shown a global decrease of mature miRNA expression in human cancers. However, it is unclear whether this global repression of miRNAs reflects the undifferentiated state of tumors or causally contributes to the transformed phenotype. Here we show that global repression of miRNA maturation promotes cellular transformation and tumorigenesis. Cancer cells expressing short hairpin RNAs (shRNAs) targeting three different components of the miRNA processing machinery showed a substantial decrease in steady-state miRNA levels and a more pronounced transformed phenotype. In animals, miRNA processing-impaired cells formed tumors with accelerated kinetics. These tumors were more invasive than control tumors, suggesting that global miRNA loss enhances tumorigenesis. Furthermore, conditional deletion of Dicer1 enhanced tumor development in a K-Ras-induced mouse model of lung cancer. Overall, these studies indicate that abrogation of global miRNA processing promotes tumorigenesis. More... »

PAGES

673-677

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ng2003

DOI

http://dx.doi.org/10.1038/ng2003

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1036221931

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/17401365


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