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The Janus effect: two faces of aldosterone.
1Division of Kidney Diseases and Hypertension, Rhode Island Hospital, Providence, Rhode Island 02903, USA. Andrew_Brem@Brown.edu
Kidney International
|January 1, 2009
Summary
N(omega)-nitro-l-arginine methyl ester (l-NAME) causes hypertension by increasing aldosterone, mimicking mineralocorticoid excess. Spironolactone treatment significantly reduces these kidney changes, suggesting a link between nitric oxide inhibition and mineralocorticoid pathways.
Area of Science:
- Nephrology
- Endocrinology
- Cardiovascular Research
Background:
- Nitric oxide (NO) pathway inhibition via N(omega)-nitro-l-arginine methyl ester (l-NAME) is known to induce hypertension and proteinuria.
- The precise mechanisms underlying these l-NAME-induced pathologies remain incompletely understood.
- Prolonged mineralocorticoid administration shares pathological similarities with l-NAME treatment.
Discussion:
- l-NAME administration leads to a substantial 50-fold increase in plasma aldosterone levels.
- The mineralocorticoid receptor antagonist, spironolactone, significantly mitigates the renal alterations observed in l-NAME-treated subjects.
- These findings suggest that chronic l-NAME exposure may serve as a valuable experimental model for studying mineralocorticoid excess.
Key Insights:
- Chronic nitric oxide inhibition by l-NAME significantly elevates plasma aldosterone.
- Aldosterone surge is a key mediator of l-NAME-induced hypertension and renal pathology.
- Spironolactone effectively reverses l-NAME-induced renal damage, highlighting the role of mineralocorticoids.
Outlook:
- Further investigation into the interplay between the nitric oxide pathway and the renin-angiotensin-aldosterone system.
- Exploring l-NAME as a preclinical model for conditions characterized by mineralocorticoid excess.
- Developing novel therapeutic strategies targeting mineralocorticoid signaling in hypertension and kidney disease.
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