Oncogene-dependent control of miRNA biogenesis and metastatic progression in a model of undifferentiated pleomorphic sarcoma.

Published

Journal Article

Undifferentiated pleomorphic sarcoma (UPS) is one of the most common soft tissue malignancies. Patients with large, high-grade sarcomas often develop fatal lung metastases. Understanding the mechanisms underlying sarcoma metastasis is needed to improve treatment of these patients. Micro-RNAs (miRNAs) are a class of small RNAs that post-transcriptionally regulate gene expression. Global alterations in miRNAs are frequently observed in a number of disease states including cancer. The signalling pathways that regulate miRNA biogenesis are beginning to emerge. To test the relevance of specific oncogenic mutations in miRNA biogenesis in sarcoma, we used primary soft tissue sarcomas expressing either Braf(V600E) or Kras(G12D). We found that Braf(V600E) mutant tumours, which have increased MAPK signalling, have higher levels of mature miRNAs and enhanced miRNA processing. To investigate the relevance of oncogene-dependent alterations in miRNA biogenesis, we introduced conditional mutations in Dicer and showed that Dicer haploinsufficiency promotes the development of distant metastases in an oncogene-dependent manner. These results demonstrate that a specific oncogenic mutation can cooperate with mutation in Dicer to promote tumour progression in vivo.

Full Text

Duke Authors

Cited Authors

  • Mito, JK; Min, HD; Ma, Y; Carter, JE; Brigman, BE; Dodd, L; Dankort, D; McMahon, M; Kirsch, DG

Published Date

  • January 2013

Published In

Volume / Issue

  • 229 / 1

Start / End Page

  • 132 - 140

PubMed ID

  • 22951975

Pubmed Central ID

  • 22951975

Electronic International Standard Serial Number (EISSN)

  • 1096-9896

Digital Object Identifier (DOI)

  • 10.1002/path.4099

Language

  • eng

Conference Location

  • England