4.7 Article

Activation of sphingosine kinase-1 mediates induction of endothelial cell proliferation and angiogenesis by epoxyeicosatrienoic acids

期刊

CARDIOVASCULAR RESEARCH
卷 78, 期 2, 页码 308-314

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OXFORD UNIV PRESS
DOI: 10.1093/cvr/cvn006

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sphingosine kinase; endothelial cells; proliferation; angiogenesis; epoxyeicosatrienoic acids

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Aims Recent evidence suggests that the epoxyeicosatrienoic acids (EETs), which are products of cytochrome P450 (CYP) epoxygenases, possess mitogenic and angiogenic effects in vascular endothelial cells. However, the mechanisms underlying these effects are not fully elucidated. Because sphingosine kinase (SK) and its product SIP play essential roles in cell growth, survival and migration, we hypothesized that SK activation by EETs may mediate some of its angiogenic effects. Methods and results We studied the effects of EETs on SK activity in human umbilical vein endothelial cells (HUVECs). Treatment with EETs, particularly 11,12-EET, markedly augmented SK activity in HUVECs. At the concentration of 1 mu mol/L, 11,12-EET increased SK activity by 110% and the maximal effect on SK activation was observed at 20 min after 11,12-EET addition. Furthermore, inhibition of SK by a specific inhibitor, SKI-II, markedly attenuated 11, 12-EET-induced EC proliferation. Importantly, 11,12-EET-induced activation of Akt kinase and transactivation of the epidermal growth factor (EGF) receptor was also inhibited by SKI-II. To investigate the isoform-specific rote of SK in EET-induced angiogenesis, inhibition of SKI by expression of dominant-negative SKI (G82D) substantially attenuated 11, 12-EET-induced EC proliferation, migration, and tube formation in vitro and Matrigel plug angiogenesis in vivo. Furthermore, knockdown of SKI expression by specific siRNA also inhibited 11,12-EET-induced EC proliferation and migration, whereas SK2 siRNA knockdown was without effect. Conclusion These results suggest that SKI is an important mediator of the 11,12-EET-induced angiogenic effects in human ECs. Thus, SKI may represent a novel therapeutic modality for the treatment of angiogenesis-related diseases such as cancer and ischaemia.

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