Document Detail

Acute hypotensive responses to peptide inhibitors of renin in conscious monkeys: an effect on blood pressure independent of plasma renin inhibition.
MedLine Citation:
PMID:  2159506     Owner:  NLM     Status:  MEDLINE    
In order to investigate the hypotensive mechanisms of action of peptide renin inhibitors, blood pressure responses to five renin inhibitors were compared with those to the angiotensin converting enzyme inhibitor, enalaprilat, in conscious African green and rhesus monkeys. (3S-4S)-4-amino-5-cyclohexyl-3-hydroxy pentanoic acid (ACHPA)-containing renin inhibitory peptide (ACRIP) and enalaprilat both decreased blood pressure in euvolemic and volume-depleted African green monkeys. However, while a maximum dose of enalaprilat reduced blood pressure to 80 +/- 4 and 56 +/- 4 mmHg in the euvolemic and volume-depleted monkeys, respectively, ACRIP lowered pressure to life-threatening levels (less than 40 mmHg) under both conditions. The relative potencies of ACRIP and four other renin inhibitors for inhibiting in vitro plasma renin activity (PRA; IC50) were compared with their potencies in reducing blood pressure by 15 mmHg (ED15 mmHg) and lowering blood pressure more than enalaprilat in volume-depleted rhesus monkeys. All renin inhibitors lowered blood pressure significantly beyond the maximal response to enalaprilat. Despite a significant correlation (r = 0.99, P less than 0.05) between the in vitro PRA inhibitory potency and the in vivo ED15 mmHg, doses which lowered blood pressure beyond the maximal responses to enalaprilat were not significantly correlated (r = 0.53, P greater than 0.05) with the in vitro PRA IC50 values. Furthermore, the profound depressor responses to renin inhibitors in rhesus monkeys were accompanied by increases in the heart rate and decreases in pulse pressure.(ABSTRACT TRUNCATED AT 250 WORDS)
L W Schaffer; T W Schorn; R J Winquist; J F Strouse; L Payne; P K Chakravarty; S E de Laszlo; J tenBroeke; D F Veber; W J Greenlee
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of hypertension     Volume:  8     ISSN:  0263-6352     ISO Abbreviation:  J. Hypertens.     Publication Date:  1990 Mar 
Date Detail:
Created Date:  1990-06-11     Completed Date:  1990-06-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8306882     Medline TA:  J Hypertens     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  251-9     Citation Subset:  IM    
Department of Pharmacology, Merck Sharp & Dohme Research Laboratories, West Point, PA 19486.
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MeSH Terms
Blood Pressure / drug effects*
Blood Volume
Cercopithecus aethiops
Enalaprilat / pharmacology
Heart Rate / drug effects
Macaca mulatta
Oligopeptides / administration & dosage,  pharmacology*
Renin / antagonists & inhibitors*,  blood
Renin-Angiotensin System
Reg. No./Substance:
0/Oligopeptides; 75645-19-1/renin inhibitory peptide; 84680-54-6/Enalaprilat; 98105-34-1/renin inhibitory peptide, 4-amino-5-cyclohexyl-3-hydroxypentanoic acid; EC

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