Published online before print February 9, 2004, doi: 10.1161/01.HYP.0000118519.66430.22
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(Hypertension. 2004;43:841.)
© 2004 American Heart Association, Inc.
Scientific Contributions |
Possible Contributions of Reactive Oxygen Species and Mitogen-Activated Protein Kinase to Renal Injury in Aldosterone/Salt-Induced Hypertensive Rats
From Department of Pharmacology (A.N., L.Y., T.S., S.K., Y.A.), Research Equipment Center (Y.N.), RI Research Center (K.M.), and Second Department of Internal Medicine (H.K., M.K.), Kagawa Medical University, Kagawa, Japan; Departments of Pharmacology (M.Y.) and Pediatrics (S.K., S.Ko.), University of Tokushima School of Medicine, Tokushima, Japan.
Correspondence to Dr Akira Nishiyama, Department of Pharmacology, Kagawa Medical University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan. E-mail akira{at}kms.ac.jp
Studies were performed to test the hypothesis that reactive oxygen species (ROS) and mitogen-activated protein kinase (MAPK) contribute to the pathogenesis of aldosterone/salt-induced renal injury. Rats were given 1% NaCl to drink and were treated with one of the following combinations for 6 weeks: vehicle (0.5% ethanol, SC, n=6); aldosterone (0.75 µg/H, SC, n=8); aldosterone plus a selective mineralocorticoid receptor antagonist; eplerenone (0.125% in chow, n=8); aldosterone plus an antioxidant; and tempol (3 mmol/L in drinking solution, n=8). The activities of MAPKs, including extracellular signal-regulated kinases (ERK)1/2, c-Jun-NH2-terminal kinases (JNK), p38MAPK, and big-MAPK-1 (BMK1) in renal cortical tissues were measured by Western blot analysis. Aldosterone-infused rats showed higher systolic blood pressure (165±5 mm Hg) and urinary excretion of protein (106±24 mg/d) than vehicle-infused rats (118±3 mm Hg and 10±3 mg/d). Renal cortical mRNA expression of p22phox, Nox-4, and gp91phox, measured by real-time polymerase chain reaction, was increased in aldosterone-infused rats by 2.3, 4.3, and 3.0-fold, respectively. Thiobarbituric acid-reactive substances (TBARS) content in renal cortex was also higher in aldosterone (0.23±0.02) than vehicle-infused rats (0.09±0.01 nmol/mg protein). ERK1/2, JNK, and BMK1 activities were significantly elevated in aldosterone-infused rats by 3.3, 2.3, and 3.0-fold, respectively, whereas p38MAPK activity was not changed. Concurrent administration of eplerenone or tempol to aldosterone-infused rats prevented the development of hypertension (127±2 and 125±5 mm Hg), and the elevations of urinary excretion of protein (10±2 and 9±2 mg/day) or TBARS contents (0.08±0.01 and 0.11±0.01 nmol/mg protein). Furthermore, eplerenone and tempol treatments normalized the activities of ERK1/2, JNK, and BMK1. These data suggest that ROS and MAPK play a role in the progression of renal injury induced by chronic elevations in aldosterone.
Key Words: mineralocorticoids • kidney • rats
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