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Elevated blood pressures in mice lacking endothelial nitric oxide synthase
E G Shesely1, N Maeda, H S Kim
1Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill 27599, USA.
Summary
Mice lacking endothelial nitric oxide synthase (eNOS) showed significantly higher blood pressure and lower heart rates. This research highlights eNOS
Area of Science:
- Cardiovascular Physiology
- Molecular Biology
- Genetics
Background:
- Endothelial nitric oxide synthase (eNOS) plays a role in vascular tone.
- Understanding eNOS function is crucial for blood pressure regulation.
Purpose of the Study:
- To investigate the role of eNOS in blood pressure regulation.
- To characterize the physiological effects of eNOS gene disruption.
Main Methods:
- Generation of mice with heterozygous (+/-) and homozygous (-/-) disruption of the eNOS gene.
- Immunohistochemical analysis to confirm eNOS protein levels.
- Measurement of blood pressure, heart rate, and plasma renin concentration.
Main Results:
- Homozygous (-/-) eNOS mutant mice exhibited significantly increased blood pressure (approx. 18 mmHg vs. +/+).
- Homozygous (-/-) mice showed significantly lower heart rates compared to wild-type and heterozygous mice.
- Plasma renin concentration was elevated in -/- mice, while kidney renin mRNA was decreased.
Conclusions:
- Endothelial nitric oxide synthase (eNOS) is essential for maintaining normal blood pressure and heart rate.
- eNOS deficiency leads to hypertension and bradycardia.
- These findings underscore the critical role of eNOS in cardiovascular homeostasis.