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(Hypertension. 2002;40:67.)
© 2002 American Heart Association, Inc.

Scientific Contributions

Effect of Pravastatin on Proteinuria in Patients With Well-Controlled Hypertension

From the Departments of Internal Medicine (T.-M.L.) and Surgery (C.-H.T.), Cardiology Section, National Taiwan University Hospital, Taipei; and the Department of Clinical Pharmacy, College of Medicine, National Cheng Kung University (S.-F.S.), Tainan, Taiwan.

Correspondence to Dr Tsung-Ming Lee, Department of Internal Medicine, Cardiology Section, National Taiwan University Hospital, 7, Chung-Shan S. RD, Taipei, Taiwan, 10002. E-mail tmlee{at}ha.mc.ntu.edu.tw

Proteinuria is an important risk factor for cardiovascular and renal morbidity and mortality. The effects of 3-hydroxy-3-methyglutaryl coenzyme A reductase inhibitor (statin) therapy on proteinuria in normolipidemic patients with well-controlled hypertension have not been studied. A total of 63 normolipidemic (total cholesterol <240 mg/dL) and proteinuric (300 to 3000 mg/d) patients with well-controlled blood pressure (<140/90 mm Hg) were randomized to receive either placebo (n=32) or pravastatin (10 mg/d; n=31) after a 3-month placebo period. Pravastatin lowered proteinuria after 6 months by 54% (P<0.0001). Creatinine clearance was stable throughout the study in the 2 groups. Despite unchanged plasma endothelin-1 levels throughout the study, urinary excretion of the peptide was decreased and significantly correlated with improvement in urinary protein excretion in pravastatin-treated patients (r=0.64, P=0.001). The urinary excretion of retinol-binding protein decreased after pravastatin administration, probably reflecting an improvement in tubular function. In contrast, the urinary excretion of IgG did not change significantly throughout the study in either group. Multivariate analysis revealed that proteinuria was only significantly correlated with statin use (P<0.0001, R²= 0.66). Linear regression analysis in the statin-treated group did not show any correlation between changes in lipid profiles and proteinuria regression. Thus, in addition to their primary function of antilipidemia, the addition of pravastatin to treatment for well-controlled hypertension may have an additive effect on reducing proteinuria independent of hemodynamics and lipid-lowering effects, possibly through inhibiting renal endothelin-1 synthesis and improving tubular function.

Key Words: receptors, angiotensin II • endothelin-1 • hypertension, chronic • statins • proteinuria

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