Document Detail


Relationship between sodium balance and renal innervation during hypertension development in the spontaneously hypertensive rat.
MedLine Citation:
PMID:  7706694     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
INTRODUCTION: The spontaneously hypertensive rat (SHR) has been shown to possess elevated efferent sympathetic nerve activity, and renal denervation delays the development of hypertension in this genetic strain. Evidence that the renal sympathetic nerves have direct effects on tubular function suggests that one of the mechanisms for increasing arterial pressure in the SHR might involve neurally mediated sodium retention. AIMS AND METHODS: The present study examined the relationships between renal sympathetic tone, daily sodium balance and the development of hypertension in SHR over a 4-week period. Conscious, unrestrained, 7-week-old SHR with innervated or denervated kidneys were placed on a fixed sodium intake by intravenous infusion (5.72 mumol/day per 100 g body weight). Urinary sodium excretion was determined once a day for 28 consecutive days; systolic blood pressure (SBP) and body weight were monitored twice a week. RESULTS: Renal denervation delayed the onset of and retarded the development of hypertension. Despite the difference in SBP, daily sodium balance was equal in the innervated and the denervated SHR. The positive sodium balances exhibited by both groups are attributed to the rapid growth observed during the time course of the experiment. The growth rate was also similar in the two groups. CONCLUSION: The present data indicate that, although the renal nerves may mediate enhanced transient tubular sodium reabsorption, sodium retention does not contribute directly to the development of hypertension in the SHR. Rather, it appears that the elevation of arterial pressure might occur as a requirement to excrete excess sodium and thus maintain a daily sodium balance.
Authors:
S Greenberg; J L Osborn
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of hypertension     Volume:  12     ISSN:  0263-6352     ISO Abbreviation:  J. Hypertens.     Publication Date:  1994 Dec 
Date Detail:
Created Date:  1995-05-10     Completed Date:  1995-05-10     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8306882     Medline TA:  J Hypertens     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1359-64     Citation Subset:  IM    
Affiliation:
Department of Physiology, Medical College of Wisconsin, Milwaukee.
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MeSH Terms
Descriptor/Qualifier:
Animals
Denervation
Hypertension / physiopathology*
Kidney / innervation*
Male
Rats
Rats, Inbred SHR
Rats, Inbred WKY
Sodium / metabolism*
Sympathetic Nervous System / physiology*
Water-Electrolyte Balance
Grant Support
ID/Acronym/Agency:
HL-29587/HL/NHLBI NIH HHS; HL-40137/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
7440-23-5/Sodium

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


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