Abstract
Although the angiotensin receptor antagonist (ARB) shares the angiotensin-II-blocking activity with the angiotensin-converting enzyme inhibitor (ACE-I), pharmacological mechanisms of action of these agents differ. We evaluated the temporal profiles of action of ACE-I and ARB on urinary protein excretion and nitrate/nitrate (NOx) excretion in hypertensive (140 and/or 90 mmHg) patients with chronic renal disease (serum creatinine<265 (range, 44–265) μmol/l or creatinine clearance>30 (range, 30–121) ml/min). Patients with mild (<1 g/day; range, 0.4–1.0) and moderate proteinuria (>1 g/day; range, 1.1–6.9) were randomly assigned to ACE-I- and ARB-treated groups, and were treated with ACE-I (trandolapril or perindopril) or ARB(losartan or candesartan) for 48 weeks. In all groups, treatment with ACE-I or ARB decreased blood pressure to the same level, but had no effect on creatinine clearance. In patients with mild proteinuria, neither ACE-I nor ARB altered urinary protein excretion. In patients with moderate proteinuria, ACE-I caused 44±6% reduction in proteinuria (from 2.7±0.5 to 1.5±0.4 g/day, n=14) at 12 weeks, and this beneficial effect persisted throughout the protocol (48 weeks, 1.2±0.2 g/day). In contrast, ARB did not produce a significant decrease in proteinuria at 12 weeks (23±8%, n=13), but a 41±6% reduction in proteinuria was observed at 48 weeks. Similarly, although early (12 weeks) increases in urinary NOx excretion were observed with ACE-I (from 257±70 to 1111±160 μmol/day) and ARB (from 280±82 to 723±86 μmol/day), the ARB-induced increase in NOx excretion was smaller than that by ACE-I (P<0.05). In conclusion, although both ACE-I and ARB reduce blood pressure similarly, the effect of these agents on proteinuria differs in chronic renal disease with moderate proteinuria. Relatively early onset of the proteinuria-reducing effect was observed with ACE-I, which paralleled the increase in urinary NOx excretion. Conversely, ARB decreased proteinuria and increased urinary NOx excretion gradually. These time course-dependent changes in proteinuria and urinary NOx may reflect the pharmacological property of ACE-I and ARB, with regard to the action on bradykinin.
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Matsuda, H., Hayashi, K. & Saruta, T. Distinct time courses of renal protective action of angiotensin receptor antagonists and ACE inhibitors in chronic renal disease. J Hum Hypertens 17, 271–276 (2003). https://doi.org/10.1038/sj.jhh.1001543
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DOI: https://doi.org/10.1038/sj.jhh.1001543
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