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Can L-arginine manipulation reduce renal disease?
1Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA.
Seminars in Nephrology
|May 5, 1999
Summary
L-arginine supplementation benefits kidney function by improving renal blood flow and filtration. It also reduces inflammation and pathological changes in various kidney disease models in animals.
Area of Science:
- Nephrology
- Physiology
- Biochemistry
Background:
- L-arginine is a precursor to nitric oxide (NO), a molecule involved in regulating renal hemodynamics and inflammation.
- N-nitro-L-arginine methylester (L-NAME), an L-arginine antagonist, increases blood pressure and reduces renal ultrafiltration.
- The precise role of L-arginine and NO in glomerular diseases remains debated, though evidence suggests potential benefits.
Purpose of the Study:
- To investigate the effects of L-arginine administration on renal function and pathology in several animal models of kidney disease.
- To explore the potential role of the L-arginine-nitric oxide pathway in ameliorating renal damage and dysfunction.
Main Methods:
- Administration of L-arginine to rats with ureteral obstruction, subtotal nephrectomy, and diabetes.
- Chronic administration of L-NAME to assess its impact on blood pressure and ultrafiltration.
- Evaluation of renal plasma flow, glomerular filtration rate (GFR), macrophage infiltration, interstitial volume, collagen deposition, alpha-smooth muscle actin expression, proteinuria, and glomerular abnormalities.
Main Results:
- L-arginine increased GFR and renal blood flow in post-obstructive kidneys.
- L-arginine reduced macrophage infiltration, interstitial volume expansion, collagen deposition, and alpha-smooth muscle actin expression in obstructed kidneys.
- L-arginine administration attenuated proteinuria and abnormal glomeruli in subtotal nephrectomy models.
- In diabetic rats, L-arginine decreased hyperfiltration and proteinuria.
- L-NAME administration increased blood pressure and decreased the ultrafiltration coefficient.
Conclusions:
- L-arginine administration demonstrates protective effects in various experimental kidney disease models, improving renal hemodynamics and reducing inflammation and fibrosis.
- The L-arginine-NO pathway appears to play a significant role in mitigating hypertension, renal disease, inflammation, and atherosclerosis.
- Further research is warranted to clarify the therapeutic potential of L-arginine in human glomerular diseases.