Volume 12, Issue 5 pp. 923-931
Original Article

DGCR8-mediated disruption of miRNA biogenesis induces cellular senescence in primary fibroblasts

Daniel Gómez-Cabello

Daniel Gómez-Cabello

Instituto de Investigaciones Biomédicas ‘Alberto Sols’ CSIC-UAM, Madrid, Spain

These authors contributed equally.Search for more papers by this author
Isabel Adrados

Isabel Adrados

Instituto de Investigaciones Biomédicas ‘Alberto Sols’ CSIC-UAM, Madrid, Spain

These authors contributed equally.Search for more papers by this author
David Gamarra

David Gamarra

Instituto de Investigaciones Biomédicas ‘Alberto Sols’ CSIC-UAM, Madrid, Spain

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Hikaru Kobayashi

Hikaru Kobayashi

Instituto de Investigaciones Biomédicas ‘Alberto Sols’ CSIC-UAM, Madrid, Spain

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Yoshihiro Takatsu

Yoshihiro Takatsu

Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, London, UK

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Kyoko Takatsu

Kyoko Takatsu

Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, London, UK

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Jesús Gil

Jesús Gil

Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, London, UK

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Ignacio Palmero

Corresponding Author

Ignacio Palmero

Instituto de Investigaciones Biomédicas ‘Alberto Sols’ CSIC-UAM, Madrid, Spain

Correspondence

Ignacio Palmero, Instituto de Investigaciones Biomédicas ‘Alberto Sols’ CSIC-UAM. Arturo Duperier, 4, Madrid 28029, Spain. Tel.: (+34) 915854491; fax: (+34) 915854401; e-mail: [email protected]

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First published: 17 June 2013
Citations: 22

Summary

The regulation of gene expression by microRNAs (miRNAs) is critical for normal development and physiology. Conversely, miRNA function is frequently impaired in cancer, and other pathologies, either by aberrant expression of individual miRNAs or dysregulation of miRNA synthesis. Here, we have investigated the impact of global disruption of miRNA biogenesis in primary fibroblasts of human or murine origin, through the knockdown of DGCR8, an essential mediator of the synthesis of canonical miRNAs. We find that the inactivation of DGCR8 in these cells results in a dramatic antiproliferative response, with the acquisition of a senescent phenotype. Senescence triggered by DGCR8 loss is accompanied by the upregulation of the cell-cycle inhibitor p21CIP1. We further show that a subset of senescence-associated miRNAs with the potential to target p21CIP1 is downregulated during DGCR8-mediated senescence. Interestingly, the antiproliferative response to miRNA biogenesis disruption is retained in human tumor cells, irrespective of p53 status. In summary, our results show that defective synthesis of canonical microRNAs results in cell-cycle arrest and cellular senescence in primary fibroblasts mediated by specific miRNAs, and thus identify global miRNA disruption as a novel senescence trigger.

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