Document Detail


Sodium-proton exchange and primary hypertension. An update.
MedLine Citation:
PMID:  7558226     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
An enhancement of sodium-proton exchange in blood cells of patients with primary hypertension has been described by various investigators. The present review summarizes some of the most recent findings regarding the enhanced sodium-proton exchanger activity in primary hypertension and discusses the potential mechanisms that may contribute to or explain these findings. Novel evidence has been accumulated on the in vivo regulation of the sodium-proton exchanger in humans, and recent findings suggest that metabolic acidosis, high NaCl intake, and circulating hormones (eg, insulin) can enhance sodium-proton exchanger activity in blood cells. However, the relative roles of such exogenous factors in the stimulation of sodium-proton exchanger activity in primary hypertension remain questionable because enhanced sodium-proton exchanger activity persists in immortalized lymphoblasts from patients with primary hypertension after prolonged cell culture. Therefore, at least in a certain group of hypertensive subjects this abnormality cannot be due to metabolic or hormonal alterations of the "hypertensive" in vivo milieu but appears to be under genetic control. Available evidence strongly argues against intrinsic changes of the sodium-proton exchanger protein itself in primary hypertension, for example, a mutation in the encoding gene. Interestingly, immortalized cells from hypertensive subjects with enhanced sodium-proton exchanger activity display a distinctly enhanced proliferation pattern that appears to be independent of this ion transport. At present we speculate that enhanced sodium-proton exchanger activity and proliferation may represent indicators of a genetically fixed enhanced intracellular signal transduction in primary hypertension that may be caused by an increased activation of pertussis toxin-sensitive G proteins.
Authors:
W Siffert; R Düsing
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Hypertension     Volume:  26     ISSN:  0194-911X     ISO Abbreviation:  Hypertension     Publication Date:  1995 Oct 
Date Detail:
Created Date:  1995-11-07     Completed Date:  1995-11-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7906255     Medline TA:  Hypertension     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  649-55     Citation Subset:  IM    
Affiliation:
Institut für Pharmakologie, Universitätsklinikum, Essen, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cell Division
Cell Line, Transformed / metabolism
Humans
Hypertension / metabolism*,  pathology
Intracellular Membranes / metabolism
Phenotype
Sodium-Hydrogen Antiporter / metabolism*
Chemical
Reg. No./Substance:
0/Sodium-Hydrogen Antiporter

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


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