Changes in vascular endothelium and its function in systemic arterial hypertension

Area of Science:

• Cardiovascular Physiology
• Endothelial Biology
• Hypertension Research

Background:

• The endothelium plays a critical role in regulating vascular tone and integrity.
• Pulmonary and arterial hypertension are associated with significant alterations in endothelial function.

Purpose of the Study:

• To describe changes in endothelial function during acute and chronic hypertension.
• To investigate the impact of hypertension on endothelial permeability, cell morphology, and mediator production.

Main Methods:

• Review of existing literature on endothelial function in various hypertension models.
• Analysis of changes in endothelial permeability, cell hyperplasia/hypertrophy, and tight junctions.
• Examination of endothelial mediator synthesis (prostacyclin) and metabolism (prostaglandins).

Main Results:

• Hypertension enhances endothelial permeability and alters endothelial cell size and replication.
• Endothelial uptake of norepinephrine and serotonin increases; prostacyclin synthesis is elevated in specific models.
• Responses to vasodilators are impaired, and vascular smooth muscle responsiveness to relaxing factors is diminished.

Conclusions:

• Endothelial dysfunction is a key feature of both pulmonary and arterial hypertension.
• Altered endothelial cell characteristics and mediator balance contribute to hypertensive vascular changes.
• Impaired vascular smooth muscle response to endothelium-derived factors is a critical consequence of hypertension.