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Endothelial permeability in uremia
Steven J Harper1, David O Bates
1Microvascular Research Laboratories, Department of Physiology, University of Bristol, Preclinical Veterinary School, Bristol, United Kingdom. s.harper@bristol.ac.uk
Insights
Patients with uremia face a higher cardiovascular disease risk than healthy adults, even before dialysis. Endothelial cell dysfunction and increased transendothelial transport contribute to this accelerated vascular pathology.
Area of Science:
- Nephrology
- Cardiovascular Medicine
- Vascular Biology
Background:
- Patients with long-term uremia exhibit a significantly elevated risk of cardiovascular disease (CVD).
- This CVD risk surpasses predictions based on traditional vascular risk factors, even prior to dialysis initiation.
- Accelerated vascular disease in uremia is not fully understood but involves endothelial dysfunction and altered transendothelial transport.
Purpose of the Study:
- To review the clinical severity of cardiovascular disease in uremia.
- To examine the role of the vascular endothelium and microvascular permeability in uremic vascular pathology.
- To present evidence for endothelial dysfunction in both early and dialysis-dependent uremia.
Main Methods:
- Literature review and synthesis of existing research.
- Analysis of in vitro and in vivo studies on endothelial function in uremia.
- Discussion of microvascular permeability as a functional marker of endothelial health.
Main Results:
- Uremia is associated with profound endothelial cell dysfunction.
- Increased transendothelial transport of lipids and macromolecules contributes to CVD in uremia.
- Endothelial dysfunction is a critical factor in the initiation of aggressive cardiovascular pathology in uremic patients.
Conclusions:
- Endothelial dysfunction is a central feature of uremia, driving accelerated cardiovascular disease.
- Understanding endothelial function is crucial for managing CVD risk in uremic populations.
- Further research into the mechanisms of endothelial dysfunction in uremia is warranted.
Abstract:
The risk of cardiovascular disease is significantly higher in patients with long-term uremia than in otherwise healthy adults. In addition, the risk is greater than what would be predicted from classic vascular risk factors. This is true even before patients proceed to dialysis. Although the reasons for this accelerated vascular disease are unknown, transendothelial transport of lipids and other macromolecules in both large vessels and the microcirculation has been implicated in the generation of cardiovascular disease. Furthermore, endothelial cell dysfunction is widely accepted as a cardinal feature of both modest and dialysis-dependent uremia, and is regarded as a critical step in the initiation of this aggressive pathology. This overview considers the severity of the clinical problem, the nature of the vascular endothelium, microvascular permeability (and the measurement thereof) as a functional property of the endothelium, and the in vitro and in vivo evidence for endothelial dysfunction in uremia.