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Vascular endothelium as a target for endogenous ouabain: studies on the effect of ouabain on human endothelial cells
Insights
Endogenous ouabain protects human umbilical vein endothelial cells (HUVEC) from apoptosis via PI-3K and ERK signaling. It also impacts MTT endocytosis through Src kinase activation, influencing endothelial function.
Area of Science:
- Cardiovascular Biology
- Cellular Signaling
- Endothelial Cell Function
Background:
- Endogenous ouabain is implicated in blood pressure regulation and hypertension.
- Vascular endothelial cells are critical for blood flow and possess antithrombotic properties.
- Endothelial cells may be a target for endogenous ouabain's effects.
Purpose of the Study:
- To investigate the effects of ouabain on human umbilical vein endothelial cells (HUVEC).
- To elucidate the signal transduction pathways mediating ouabain's actions on HUVEC.
- To understand the implications of ouabain's endothelial effects on pathophysiology.
Main Methods:
- Exposure of HUVEC to nanomolar concentrations of ouabain.
- Assessment of antiapoptotic activity.
- Analysis of phosphatidylinositol 3 kinase (PI-3K) and extracellular signal-regulated kinases (ERK) activation.
- Investigation of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) endocytosis.
- Evaluation of Src kinase signaling.
Main Results:
- Nanomolar ouabain exhibits antiapoptotic effects in HUVEC.
- These antiapoptotic effects are dependent on PI-3K and ERK activation.
- Ouabain influences MTT endocytosis in HUVEC.
- This effect on endocytosis involves Src kinase activation.
Conclusions:
- Endogenous ouabain at nanomolar concentrations exerts protective effects on HUVEC.
- Ouabain modulates endothelial cell function through PI-3K, ERK, and Src kinase signaling pathways.
- These findings contribute to understanding the role of ouabain in endothelial pathophysiology and hypertension.
Abstract:
It has been suggested that an endogenous inhibitor of the sodium pump, identified as ouabain, contributes to the regulation of blood pressure and the pathogenesis of certain forms of hypertension. Vascular endothelial cells, whose functional integrity is crucial for the maintenance of blood flow and the antithrombotic activity, could be a target for endogenous ouabain. We studied the effect of ouabain on human umbilical vein endothelial cells (HUVEC) and found that nanomolar concentrations of the glycoside have an antiapoptotic activity that is dependent on the activation of phosphatidylinositol 3 kinase (PI-3K) and extracellular signal-regulated kinases (ERKs). At the same concentrations we found that ouabain affects the endocytosis of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) through the activation of signaling proteins such as Src kinase. This review sumarizes our findings on the effect of ouabain on HUVEC, the signal transduction pathways involved and the significance of these observations on the pathophysiology of endothelial function.
