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Cellular and Molecular Biology Letters

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Volume 14, Issue 3


The effects of markedly raised intracellular sphingosine kinase-1 activity in endothelial cells

Vidya Limaye
  • Royal Adelaide Hospital, Department of Rheumatology, North Tce, Royal Adelaide Hospital, Adelaide, SA, 5000, Australia
  • Division of Human Immunology, Institute of Medical and Veterinary Science, Frome Road, Adelaide, SA, 5000, Australia
  • Department of Medicine, University of Adelaide, Frome Rd, Adelaide, SA, Australia
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/ Mathew Vadas / Stuart Pitson
  • Division of Human Immunology, Institute of Medical and Veterinary Science, Frome Road, Adelaide, SA, 5000, Australia
  • School of Molecular and Biomedical Science, University of Adelaide, Adelaide, Australia
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/ Jennifer Gamble
Published Online: 2009-06-27 | DOI: https://doi.org/10.2478/s11658-009-0008-2


The enzyme sphingosine kinase-1 (SK1) promotes the formation of sphingosine-1-phosphate (S1P), which is an important survival factor for endothelial cells (EC). Modest increases in intracellular SK1 activity in the EC are known to confer a survival advantage upon the cells. Here, we investigated the effects of more dramatic increases in intracellular SK1 in the EC. We found that these cells show reduced cell survival under conditions of stress, enhanced caspase-3 activity, cell cycle inhibition, and cell-cell junction disruption. We propose that alterations in the phosphorylation state of the enzyme may explain the differential effects on the phenotype with modest versus high levels of enforced expression of SK1. Our results suggest that SK1 activity is subject to control in the EC, and that this control may be lost in conditions involving vascular regression.

Keywords: Sphingosine kinase-1; Endothelial cells; Cell survival

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About the article

Published Online: 2009-06-27

Published in Print: 2009-09-01

Citation Information: Cellular and Molecular Biology Letters, Volume 14, Issue 3, Pages 411–423, ISSN (Online) 1689-1392, DOI: https://doi.org/10.2478/s11658-009-0008-2.

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© 2009 University of Wrocław, Poland. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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