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Circulation. 2014 Feb 18;129(7):773-85. doi: 10.1161/CIRCULATIONAHA.113.002565. Epub 2013 Nov 18.

Synergistic role of protein phosphatase inhibitor 1 and sarco/endoplasmic reticulum Ca2+ -ATPase in the acquisition of the contractile phenotype of arterial smooth muscle cells.

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  • 1Cardiovascular Research Center. Mount Sinai School of Medicine, New York, NY (L. Lipskaia, J.C., I.C.T., D.J., I.K., A.S.R., L. Liang, S.T.T., J.C.K., R.J.H.., L.H.); INSERM UMRS 956, Université Pierre et Marie Curie-Paris 6, Paris, France (L. Lipskaia, E.M., F.A., A.-M.L.); LIA/Transatlantic Cardiovascular Research Center, Université Pierre et Marie Curie/Mount Sinai School of Medicine, New York, NY (L. Lipskaia, J.C., I.C.T., E.M., D.J., I.K., L. Liang, F.A., A.-M.L., S.T.T., J.C.K., R.J.H., L.H.); INSERM U770, University Paris Sud, Le Kremlin-Bicêtre, France (R.B., J.J.L.); PECMV-Université Pierre et Marie Curie-Paris, Paris, France (N.M.); and University of Cincinnati, Cincinnati, OH (E.K.).



Phenotypic modulation or switching of vascular smooth muscle cells from a contractile/quiescent to a proliferative/synthetic phenotype plays a key role in vascular proliferative disorders such as atherosclerosis and restenosis. Although several calcium handling proteins that control differentiation of smooth muscle cells have been identified, the role of protein phosphatase inhibitor 1 (I-1) in the acquisition or maintenance of the contractile phenotype modulation remains unknown.


In human coronary arteries, I-1 and sarco/endoplasmic reticulum Ca2+ -ATPase expression is specific to contractile vascular smooth muscle cells. In synthetic cultured human coronary artery smooth muscle cells, protein phosphatase inhibitor 1 (I-1 target) is highly expressed, leading to a decrease in phospholamban phosphorylation, sarco/endoplasmic reticulum Ca2+ -ATPase, and cAMP-responsive element binding activity. I-1 knockout mice lack phospholamban phosphorylation and exhibit vascular smooth muscle cell arrest in the synthetic state with excessive neointimal proliferation after carotid injury, as well as significant modifications of contractile properties and relaxant response to acetylcholine of femoral artery in vivo. Constitutively active I-1 gene transfer decreased neointimal formation in an angioplasty rat model by preventing vascular smooth muscle cell contractile to synthetic phenotype change.


I-1 and sarco/endoplasmic reticulum Ca2+ -ATPase synergistically induce the vascular smooth muscle cell contractile phenotype. Gene transfer of constitutively active I-1 is a promising therapeutic strategy for preventing vascular proliferative disorders.


calcium; gene therapy; muscle, smooth; restenosis; vascular diseases

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