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Endothelial Function

General Considerations

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Summary

The endothelium is involved in both the physiological regulation of vascular tone and the structural transformation of the vessel under pathological conditions. Under physiological conditions, endothelial cells continuously secrete nitric oxide (NO), which relaxes smooth muscle cells and ensures vessel patency. Damaged or excessively activated endothelial cells can also secrete vasoconstrictor factors, the best known of which is endothelin-1 (ET-1), as well as factors that affect the differentiation and growth of vascular smooth muscle cells.

How endothelial cell damage contributes, under pathological conditions, to vascular disease can best be illustrated in patients with diabetes mellitus, in whom there are pronounced changes in endothelial cell structure and function.

Endothelial cells also interact with cells in the bloodstream. ET-1 and other factors are released from endothelial cells into the bloodstream, where their chemotactic action can induce leucocytes and platelets to migrate to the endothelial wall. Endothelial cells induce adhesion by expression of specific surface adhesion molecules (selectins, integrins and a supergene family of immunoglobulins) that can interact with ligands on the leucocytes and platelets. The expression of adhesion molecules is increased in endothelial cells chronically damaged by risk factors for atherosclerosis. The disturbed permeability of the endothelial layer in patients with diabetes mellitus and/or hyperlipidaemia leads to an increased influx of substances from the circulation into the vessel wall. In addition, endothelial cell dysfunction can lead to accelerated intravessel blood coagulation.

It is evident that the endothelium plays a central role in many of the early pathophysiological processes involved in atherosclerosis. It is therefore important to investigate the effects of antiatherosclerotic therapy on endothelial cell function and cell-to-cell interactions. Until recently, little was known about the direct effects of calcium antagonists on endothelial cell function. Recent studies, including two clinical studies, indicate that calcium antagonists primarily affect interactions of endothelial cells, smooth muscle cells, monocytes and platelets, which play a central role in the early phases of the development of atherosclerosis, whereas the protective effect of these agents on the vascular system appears to be low at later stages.

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  1. Franz Volhard Klinik, Universitätsklinikum Rudolf Virchow, Wiltberg Strasse 50, 13125, Berlin, Germany

    Hermann Haller

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Haller, H. Endothelial Function. Drugs 53 (Suppl 1), 1–10 (1997). https://doi.org/10.2165/00003495-199700531-00003

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