Role of renal kallikrein in modulating the antihypertensive effect of a single oral dose of captopril in normal- and low-renin essential hypertensives

Paolo Madeddu, Mario Oppos, Speranza Rubattu, Paolo Dessi’-Fulgheri, Nicola Glorioso, Aldo Soro, Alessandro Rappelli

Research output: Contribution to journalArticlepeer-review

Abstract

The antihypertensive efficacy of angiotensin converting enzyme (ACE) inhibitors may result from the blockade of angiotensin II formation but also, theoretically, from the inhibition of kinin breakdown. To test whether a blunted activity of the kallikrein-kinin system might account for the failure of ACE inhibitors in lowering blood pressure (BP) in patients in whom the renin-angiotensin system (RAS) is not enhanced, 31 essential hypertensives with normal or low plasma renin activity (PRA) were evaluated before and after a single oral dose (50 mg) of captopril. A significant fall, in both systolic and diastolic BP, was obtained in the subgroup of patients who were classified as ‘normal- kallikrein hypertensives’ according to whether their pretreatment urinary kallikrein excretion was within the normal range, while no significant change in BP was observed in ‘low-kallikrein hypertensives’. Furthermore, the mean percentage fall in mean BP, throughout the 2 h following captopril administration, was significantly related to the basal value of urinary kallikrein excretion (r = 0.47, P <0.05) in all the patients. Our results suggest that blunted activity of the kallikrein system might be responsible for failure of captopril to lower BP in some hypertensive patients.

Original languageEnglish
Pages (from-to)645-648
Number of pages4
JournalJournal of Hypertension
Volume5
Issue number6
Publication statusPublished - 1987

Keywords

  • ACE inhibitors
  • Kallikrein
  • Renin

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Internal Medicine
  • Endocrinology

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