Abstract
Snail1 is a master regulator of the epithelial–mesenchymal transition (EMT) and has been implicated in key tumor biological processes such as invasion and metastasis. It has been previously shown that poly(ADP-ribose) polymerase-1 (PARP-1) knockdown, but not PARP inhibition, downregulates the expression of Snail1. In this study we have characterized a novel regulatory mechanism controlling Snail1 protein expression through poly(ADP-ribosyl)ation. The effect is not only limited to repression of Snail1 transcription but also to downregulated Snail1 protein stability. PARP-1 (but not PARP-2) poly(ADP) ribosylates Snail1, both in vivo and in vitro, and interacts with Snail1, an association that is sensitive to PARP inhibitors. PARP inhibition has also clear effects on EMT phenotype of different tumor cells, including Snail1 downregulation, E-cadherin upregulation, decreased cell elongation and invasiveness. Therefore, this study reveals a new regulatory mechanism of Snail1 activation through poly(ADP-ribosyl)ation with consequences in malignant transformation through EMT.
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Acknowledgements
We acknowledge Laura López for her technical assistance. MIR is recipient of a postdoctoral fellowship financed by the program JAE-Doc of CSIC. She was also funded by Junta de Andalucía Short-Term Fellowships to stay at the Département ‘Intégrité du Génome’ de I'UMR 7175, École Supérieure de Biotechnologie de Strasbourg, Strasbourg, France and Ministerio de Ciencia ‘Programa José Castillejo’ to stay at the Department of Cell Biology, Netherlands Cancer Institute, Amsterdam, The Netherlands. This work was supported by Ministerio de Ciencia e Innovación SAF2006-01094; SAF2009-13281-C02-01, Fundación La Caixa BM06-219-0; and Junta de Andalucía P07-CTS-0239 to FJO; Ministerio de Educación y Ciencia SAF2007-64597 and ‘Ministerio de Ciencia y Tecnología’ (SAF2006-03399) and ‘la Fundación Científica de la Asociación Española contra el Cáncer’ to AGH.
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Rodríguez, M., González-Flores, A., Dantzer, F. et al. Poly(ADP-ribose)-dependent regulation of Snail1 protein stability. Oncogene 30, 4365–4372 (2011). https://doi.org/10.1038/onc.2011.153
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DOI: https://doi.org/10.1038/onc.2011.153
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