Abstract
Anaplastic thyroid carcinomas (ATCs) arise from epithelial thyroid cells by mesenchymal de-/transdifferentiation and rapidly invade the adjacent tissue. Specific microRNA signatures were suggested to distinguish ATCs from normal thyroid tissue and other thyroid carcinomas of follicular origin. Whether distinct microRNA patterns correlate with de-/transdifferentiation and invasion of ATCs remained elusive. We identified two significantly decreased microRNA families that unambiguously distinguish ATCs from papillary and follicular thyroid carcinomas: miR-200 and miR-30. Expression of these microRNAs in mesenchymal ATC-derived cells reduced their invasive potential and induced mesenchymal–epithelial transition (MET) by regulating the expression of MET marker proteins. Supporting the role of transforming growth factor (TGF)β signaling in modulating MET/epithelial–mesenchymal transition (EMT), expression of SMAD2 and TGFBR1, upregulated in most primary ATCs, was controlled by members of the miR-30 and/or miR-200 families in ATC-derived cells. Inhibition of TGFβ receptor 1 (TGFBR1) in these cells induced MET and reduction of prometastatic miR-21, but caused an increase of the miR-200 family. These findings identify altered microRNA signatures as potent markers for ATCs that promote de-/transdifferentiation (EMT) and invasion of these neoplasias. Hence, TGFBR1 inhibition could have a significant potential for the treatment of ATCs and possibly other invasive tumors.
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Acknowledgements
This work was supported by DFG and BMBF (FKZ 01ZZ0404) funding to Stefan Hüttelmaier.
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Braun, J., Hoang-Vu, C., Dralle, H. et al. Downregulation of microRNAs directs the EMT and invasive potential of anaplastic thyroid carcinomas. Oncogene 29, 4237–4244 (2010). https://doi.org/10.1038/onc.2010.169
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DOI: https://doi.org/10.1038/onc.2010.169
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