Please use this identifier to cite or link to this item: http://ahro.austin.org.au/austinjspui/handle/1/11285
Title: Characterization of cardiac angiotensin converting enzyme (ACE) and in vivo inhibition following oral quinapril to rats.
Authors: Fabris, Bruno;Yamada, H;Cubela, R B;Jackson, B;Mendelsohn, Frederick AO;Johnston, Colin I
Affiliation: University of Melbourne, Department of Medicine, Austin Hospital, Heidelberg, Victoria, Australia.
Issue Date: 1-Jul-1990
Citation: British Journal of Pharmacology; 100(3): 651-5
Abstract: 1. Angiotensin converting enzyme (ACE) from the rat heart and lung was studied by use of the radioligand [125I]-351A. 2. Displacement of the bound radioinhibitor [125I]-351A was used to assess the relative potency of six ACE inhibitors in rat heart and lung homogenates and estimate the binding association constant (KA). 3. The KA for atrial preparations was significantly higher than that of the lung (P less than 0.025) and also the ventricles (P less than 0.005). Ventricular preparations and preparations from the lung also differed significantly (P less than 0.05). These differences in KA were noted for all six ACE inhibitors used to displace the radioligand. 4. The rank order of potency of the ACE inhibitors was quinaprilat = benazeprilat greater than perindoprilat greater than 351A greater than lisinopril greater than fosinoprilat. 5. Cardiac ACE inhibition was studied ex vivo following oral administration of quinapril to rats. Following 0.3 mg kg-1 quinapril, the time course and degree of inhibition of ventricular and atrial ACE were similar. 6. These results suggest that the detected differences in KA noted have only a limited potential biological significance. The difference in KA may reflect variations in the structure or conformation of ACE in different tissues.
Internal ID Number: 2167741
URI: http://ahro.austin.org.au/austinjspui/handle/1/11285
URL: http://www.ncbi.nlm.nih.gov/pubmed/2167741
Type: Journal Article
Subjects: Angiotensin-Converting Enzyme Inhibitors.diagnostic use.metabolism
Animals
Dipeptides.diagnostic use
In Vitro Techniques
Iodine Radioisotopes.diagnostic use
Isoquinolines.blood.diagnostic use
Kinetics
Lung.enzymology
Male
Myocardium.enzymology
Peptidyl-Dipeptidase A.analysis
Radioligand Assay
Rats
Rats, Inbred Strains
Tetrahydroisoquinolines
Appears in Collections:Journal articles

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