Document Detail


Aldosterone-binding globulin-induced hypertension in the rat. A new experimental model.
MedLine Citation:
PMID:  6360879     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A thermostable urinary homologue of the plasma aldosterone-binding globulin (ABG), designated ABG-TsU, was isolated and purified by differential ultrafiltration, ion exchange chromatography, and gel filtration to electrophoretic homogeneity. Scatchard plot analysis using highly purified ABG-TsU demonstrated reversible high-affinity low-capacity binding at separate sites for aldosterone and dehydroepiandrosterone sulfate (DHEA-SO4). ABG-TsU injected intraperitoneally (i.p.) in male rats resulted in sustained hypertension after 5 to 8 days, characterized after 12 days by no changes in plasma Na+ K+, aldosterone, or plasma renin activity (PRA). No histological changes could be detected in the kidneys, brains, or hearts, nor evidence of adrenocortical hyperplasia. This hypertension appears to be aldosterone-dependent since it is prevented by bilateral adrenalectomy or administration of a spironolactone, but not by adrenalectomy when aldosterone is given concomitantly with ABG-TsU. Hemodynamic characterization of this hypertension was carried out in rats after treatment with ABG-TsU or saline i.p. for 14 days. Cardiac output (CO) was measured using the reference sample microsphere method. ABG-TsU-treated rats had significantly higher mean arterial pressure (MAP), systolic blood pressure (SBP), diastolic blood pressure (DBP), and CO, while no difference in total peripheral resistance (TPR) was detected. This new animal model of borderline essential hypertension (EH) induced by ABG-TsU, which has a reversible high-affinity binding for aldosterone, results in adrenal-dependent hypertension due at this early phase to an increase in CO without any change in TPR, which remains inappropriately normal.
Authors:
M Nowaczynski; W Nowaczynski; D Mavoungou; F Lioy; G Wilkins; K Fung; W Boyko
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Hypertension     Volume:  5     ISSN:  0194-911X     ISO Abbreviation:  Hypertension     Publication Date:    1983 Nov-Dec
Date Detail:
Created Date:  1984-02-14     Completed Date:  1984-02-14     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7906255     Medline TA:  Hypertension     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  V163-71     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adrenalectomy
Aldosterone* / blood
Animals
Binding Sites
Cardiac Output
Carrier Proteins*
Disease Models, Animal*
Hemodynamics
Hypertension* / etiology,  physiopathology
Male
Potassium / blood
Rats
Rats, Inbred Strains
Renin / blood
Serum Globulins*
Sodium / blood
Chemical
Reg. No./Substance:
0/Carrier Proteins; 0/Serum Globulins; 0/aldosterone-binding globulin protein, rat; 52-39-1/Aldosterone; 7440-09-7/Potassium; 7440-23-5/Sodium; EC 3.4.23.15/Renin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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