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Nat Med. 2017 Aug;23(8):964-974. doi: 10.1038/nm.4364. Epub 2017 Jul 10.

Plk1 regulates contraction of postmitotic smooth muscle cells and is required for vascular homeostasis.

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Cell Division and Cancer Group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.
Gene Regulation in Cardiovascular Remodelling and Inflammation Group, Spanish National Cardiovascular Centre (CNIC), Madrid, Spain.
Centro de Investigaciones Biomédicas en RED (CIBERCV), Madrid, Spain.
Clare Hall Laboratories, London Research Institute, London, UK.
Molecular Imaging Unit, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.
Advanced Imaging Unit, Spanish National Cardiovascular Centre (CNIC), and Cardiac Imaging Department, Hospital de la Princesa, Madrid, Spain.
Centro de Investigación del Cáncer de Salamanca, University of Salamanca-CSIC, Salamanca, Spain.
Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Madrid, Spain.
Comparative Pathology Unit, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.
Department of Physiology and Pharmacology and Biomedical Research Institute of Salamanca (IBSAL), University of Salamanca, Salamanca, Spain.


Polo-like kinase 1 (PLK1), an essential regulator of cell division, is currently undergoing clinical evaluation as a target for cancer therapy. We report an unexpected function of Plk1 in sustaining cardiovascular homeostasis. Plk1 haploinsufficiency in mice did not induce obvious cell proliferation defects but did result in arterial structural alterations, which frequently led to aortic rupture and death. Specific ablation of Plk1 in vascular smooth muscle cells (VSMCs) led to reduced arterial elasticity, hypotension, and an impaired arterial response to angiotensin II in vivo. Mechanistically, we found that Plk1 regulated angiotensin II-dependent activation of RhoA and actomyosin dynamics in VSMCs in a mitosis-independent manner. This regulation depended on Plk1 kinase activity, and the administration of small-molecule Plk1 inhibitors to angiotensin II-treated mice led to reduced arterial fitness and an elevated risk of aneurysm and aortic rupture. We thus conclude that a partial reduction of Plk1 activity that does not block cell division can nevertheless impair aortic homeostasis. Our findings have potentially important implications for current approaches aimed at PLK1 inhibition for cancer therapy.

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