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Angiotensin II blockade improves mitochondrial function in spontaneously hypertensive rats
E M V De Cavanagh1, J E Toblli, L Ferder
1University of Buenos Aires Physical Chemistry, School of Pharmacy and Biochemistry Junin 956, Buenos Aires (1113), Argentina.
Cellular and Molecular Biology (Noisy-Le-Grand, France)
|November 29, 2005
Summary
Hypertension damages kidney mitochondria, increasing oxidant production. Candesartan treatment improved mitochondrial function in hypertensive rats, suggesting a mechanism for its renal protective effects.
Area of Science:
- Nephrology
- Cardiovascular Research
- Mitochondrial Biology
Background:
- Hypertension is linked to mitochondrial dysfunction in multiple organs.
- Angiotensin II contributes to oxidant stress and vascular damage.
- Kidney mitochondrial health is crucial for renal function.
Purpose of the Study:
- To determine if hypertension causes kidney mitochondrial dysfunction.
- To investigate if angiotensin II blockade reverses these mitochondrial changes.
- To explore the role of mitochondrial function in candesartan's renal protective effects.
Main Methods:
- Spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats (WKY) were used.
- SHR received candesartan (angiotensin II receptor blocker) for 4 months.
- Kidney mitochondrial function, oxidant production, and markers of renal damage were assessed.
Main Results:
- Hypertensive rats exhibited impaired kidney mitochondrial function, reduced enzyme activities, and increased oxidant production.
- Candesartan treatment normalized blood pressure, proteinuria, and preserved kidney mitochondrial function in SHR.
- SHR showed higher glomerular and tubulointerstitial alpha-smooth muscle actin labeling compared to controls and treated rats.
Conclusions:
- Hypertension-induced kidney mitochondrial dysfunction is associated with increased oxidant production.
- Angiotensin II blockade with candesartan preserves kidney mitochondrial function in hypertension.
- Improved mitochondrial function may contribute to the renal protective benefits of candesartan in hypertensive individuals.
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