N-acetylcysteine attenuates the progression of chronic renal failure.

Abstract:

BACKGROUND:Lipid peroxidation impairs renal function. Aldosterone contributes to renal injury in the remnant kidney model. This study aimed to determine the effects of the antioxidant N-acetylcysteine (NAC) on renal function and aldosterone levels in chronic renal failure. METHODS:Adult male Wistar rats were submitted to 5/6 nephrectomy or laparotomy (sham-operated) and received NAC (600 mg/L in drinking water, initiated on postoperative day 7 or 60), spironolactone (1.5 g/kg of diet initiated on postoperative day 7), the NAC-spironolactone combination or no treatment. Clearance studies were performed on postoperative days 21, 60, and 120. RESULTS:Mean daily NAC and spironolactone ingestion was comparable among the treated groups. Mean weight gain was higher in NAC-treated rats than in untreated rats. A significant decrease in urinary thiobarbituric acid reactive substances (TBARS) concentrations, a lipid peroxidation marker, was observed in NAC-treated rats. By day 120, glomerular filtration rate (GFR), which dropped dramatically in untreated rats, was stable (albeit below normal) in NAC-treated rats, which also presented lower proteinuria, glomerulosclerosis index, and blood pressure, together with attenuated cardiac and adrenal hypertrophy. These beneficial effects, observed even when NAC was initiated on postnephrectomy day 60, were accompanied by a significant reduction in plasma aldosterone and urinary potassium sodium [corrected] ratio. The NAC-spironolactone combination lowered blood pressure and improved GFR protection. CONCLUSION:The NAC-spironolactone combination improves renal function more than does NAC alone. In the remnant kidney model, early or late NAC administration has a protective effect attributable to decreased plasma aldosterone and lower levels of lipid peroxidation.

journal_name

Kidney Int

journal_title

Kidney international

authors

Shimizu MH,Coimbra TM,de Araujo M,Menezes LF,Seguro AC

doi

10.1111/j.1523-1755.2005.00677.x

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

2208-17

issue

5

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)51117-4

journal_volume

68

pub_type

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