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miR-145 induces caspase-dependent and -independent cell death in urothelial cancer cell lines with targeting of an expression signature present in Ta bladder tumors

Oncogene volume 29, pages 1073–1084 (2010)Cite this article

Abstract

Downregulation of miR-145 in a variety of cancers suggests a possible tumor suppressor function for this microRNA. Here, we show that miR-145 expression is reduced in bladder cancer and urothelial carcinoma in situ, compared with normal urothelium, using transcription profiling and in situ hybridization. Ectopic expression of miR-145 induced extensive apoptosis in urothelial carcinoma cell lines (T24 and SW780) as characterized by caspase activation, nuclear condensation and fragmentation, cellular shrinkage, and detachment. However, cell death also proceeded upon caspase inhibition by the pharmacological inhibitor zVAD-fmk and ectopic expression of anti-apoptotic Bcl-2, indicating the activation of an alternative caspase-independent death pathway. Microarray analysis of transcript levels in T24 cells, before the onset of cell death, showed destabilization of mRNAs enriched for miR-145 7mer target sites. Among these, direct targeting of CBFB, PPP3CA, and CLINT1 was confirmed by a luciferase reporter assay. Notably, a 22-gene signature targeted on enforced miR-145 expression in T24 cells was significantly (P<0.00003) upregulated in 55 Ta bladder tumors with concomitant reduction of miR-145. Our data indicate that reduction in miR-145 expression may provide bladder cancer cells with a selective advantage by inhibition of cell death otherwise triggered in malignant cells.

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Acknowledgements

We thank Gitte Høj, Pamela Celis, Hanne Steen, Inge-Lis Thorsen, Gitte Stougård, and Conni Sørensen for technical assistance. We are grateful to M Jäättelä for providing the pCEP4 Bcl-2 vector construct and to Thomas B Hansen for methylation analysis software. We thank the staff at the Departments of Urology, Clinical Biochemistry, and Pathology at Aarhus University Hospital. This work was supported by the Ministry of Technology and Science, The John and Birthe Meyer Foundation, the Lundbeck Foundation, and the Danish Cancer Society, and the European Community's Seventh framework program (FP7/2007–2013) under grant agreement no 201663.

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Authors and Affiliations

  1. Department of Molecular Medicine, Aarhus University Hospital, Aarhus N, Denmark

    M S Ostenfeld, P Lamy, N Fristrup, K D Sørensen, L Dyrskjøt & T F Ørntoft

  2. Department of Molecular Biology, University of Aarhus, Aarhus C, Denmark

    J B Bramsen, S B Villadsen & J Kjems

  3. BiRC, Bioinformatics Research Center, University of Aarhus, Aarhus C, Denmark

    P Lamy

  4. Institute of Pathology NBG, Aarhus Hospital, Aarhus, Denmark

    B Ulhøi

  5. Department of Urology, Aarhus University Hospital, Skejby, Denmark

    M Borre

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  1. M S Ostenfeld
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Correspondence to T F Ørntoft.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc)

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Ostenfeld, M., Bramsen, J., Lamy, P. et al. miR-145 induces caspase-dependent and -independent cell death in urothelial cancer cell lines with targeting of an expression signature present in Ta bladder tumors. Oncogene 29, 1073–1084 (2010). https://doi.org/10.1038/onc.2009.395

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