Abstract
In vivo, endothelial cells are exposed to a complex mechanical and chemical environment that influences their structure and function. As the cellular interface between the flowing blood and the arterial wall, the endothelium effectively represents the outer boundary of the vascular tissue, and as such, it performs the important function of transmitting and transducing information from the blood to the rest of the vessel wall (8). This is particularly important in terms of the physiological regulation of lumen diameter, the maintenance of anticoagulant properties at the endothelial surface, the regulation of vascular permeability, and the pathological consequences associated with acute inflammation, wound healing, and cardiovascular disorders, such as the focal localization of atherosclerosis. In all of the above processes, the endothelium is involved in a stimulus-response coupling with humoral and/or mechanical factors in the blood. The nature of endothelial signal transduction ranges from extremely rapid electrophysiological (ion channels) responses to relatively slow gene regulatory and structural/morphologic changes. Many of these responses are only generated by the direct action of mechanical flow forces upon the endothelial cell; others, however, are only indirectly related to hemodynamic factors when flow alters the local concentration gradients of chemical mediators at the endothelial cell surface, and the mediators in turn regulate the cellular responses. The direct mechanisms primarily involve mechanical stretching that results from (1) pressure changes and (2) frictional forces at the endothelial surface in the direction of flow (shear stress). In contrast, the concentration gradient of chemical mediators at the cell surface is altered by mass transport (convection/diffusion) acting in concert with degradative enzymes at the endothelial cell surface. In this chapter, the responses of endothelial cells to flow and mechanical perturbation are summarized, ion channels are considered as a potential mechanosensor system, and examples of direct and indirect (chemical) transduction are discussed.
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Davies, P.F. (1995). Flow-Mediated Signal Transduction in Endothelial Cells. In: Bevan, J.A., Kaley, G., Rubanyi, G.M. (eds) Flow-Dependent Regulation of Vascular Function. Clinical Physiology Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7527-9_3
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