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Vascular changes associated with deoxycorticosterone-NaCl-induced hypertension
R M Lee1, M Richardson, R McKenzie
1Department of Anaesthesia, McMaster University, Hamilton, Canada.
Blood Vessels
|January 1, 1989
Summary
Deoxycorticosterone (DOC) and salt treatment induced cardiovascular changes in rats, with hypertension leading to specific arterial alterations. These structural changes varied by artery type and were more severe in hypertensive animals.
Area of Science:
- Cardiovascular Physiology
- Renal Physiology
- Vascular Biology
Background:
- Deoxycorticosterone (DOC) and salt (NaCl) administration is a model for studying hypertension.
- Understanding arterial structural adaptations to hypertension is crucial for cardiovascular health.
Purpose of the Study:
- To investigate the arterial structural alterations in rats treated with DOC/NaCl, differentiating between hypertensive and normotensive responses.
- To analyze how these alterations vary across different artery types (elastic, muscular, arteriolar).
Main Methods:
- Rats were treated with DOC and NaCl for 3 weeks, creating hypertensive (DOC-H) and normotensive (DOC-N) groups.
- Morphometric analysis of mesenteric arteries was performed on vessels fixed at maximum relaxation.
- Histological examination assessed endothelial injury, basement membrane integrity, and proteoglycan content.
Main Results:
- DOC/NaCl treatment induced arterial changes, including increased lumen, intima, and media area in hypertensive rats, correlated with blood pressure.
- Medial hypertrophy resulted from increased smooth muscle cell layers in elastic/muscular arteries and cell hypertrophy in arterioles.
- Endothelial injury and basement membrane degeneration were observed in all DOC/NaCl-treated rats, more severe in hypertensive ones.
Conclusions:
- DOC/NaCl treatment induces cardiovascular changes independent of hypertension.
- Hypertension is associated with specific arterial structural alterations that differ based on artery type.
- Arterial remodeling in response to DOC/NaCl treatment involves multiple structural components and varies with hypertensive status.