Document Detail


Enhanced increase of plasma sodium pump inhibitory activity to saline expansion in vagosympathectomized and anaesthetized dogs.
MedLine Citation:
PMID:  9179317     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To investigate whether plasma sodium pump inhibitory activity is controlled by cardiopulmonary and aortic baroreceptors, mean arterial pressure, right atrial pressure, sodium and water balances, plasma renin activity, plasma aldosterone concentration and plasma antinatriferic activity (PAA; plasma sodium pump inhibitory activity) were determined before, during and after Ringer volume expansion (10% of body wt) in anaesthetized dogs. Animals were studied with intact reflexes (CTR, n = 7) and after acute cervical bilateral vagosympathetic denervation (VGT, n = 8). With the exception of PAA, none of the parameters were different between groups before, during or after Ringer volume expansion. The PAA (microA cm-2) was similar for both groups before expansion and before either sham (CTR) or vagosympathectomy (VGT) was performed (CTR = 3.6 +/- 0.4 vs. VGT = 4.3 +/- 0.3). Compared to baseline, PAA at the end of the volume expansion phase increased in both groups (CTR = 6.1 +/- 0.8, P < 0.05; VGT = 9.1 +/- 0.7, P < 0.0005); however, this PAA value was significantly greater in the VGT group than in the CTR group (P < 0.01). At the end of the post-expansion phase, PAA levels returned toward baseline in both groups (CTR = 4.4 +/- 0.5 vs. VGT = 4.8 +/- 0.2; n.s. vs. baseline); however, this PAA value in the CTR group was not significantly different from its pak value. The present data confirm that PAA is increased in response to saline volume expansion, and suggest that PAA synthesis and/or release is under inhibitory vagosympathetic control during saline volume expansion.
Authors:
M Rodríguez-Martínez; D Brito-Orta; M Alonso-Galicia; L Padilla-Ruiz; E Dávila-Esqueda
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  160     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  1997 May 
Date Detail:
Created Date:  1997-07-17     Completed Date:  1997-07-17     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  95-102     Citation Subset:  IM    
Affiliation:
Department of Physiology and Pharmacology, School of Medicine, Universidad Autónoma de San Luis Potosí, México.
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MeSH Terms
Descriptor/Qualifier:
Anesthesia*
Animals
Biological Transport / drug effects
Blood
Blood Pressure
Blood Volume / physiology*
Diuresis
Dogs
Epithelium / metabolism
Isotonic Solutions / administration & dosage
Natriuresis
Rana pipiens
Sodium / metabolism
Sodium-Potassium-Exchanging ATPase / antagonists & inhibitors*
Sympathectomy*
Vagotomy*
Chemical
Reg. No./Substance:
0/Isotonic Solutions; 7440-23-5/Sodium; 8026-10-6/Ringer's solution; EC 3.6.3.9/Sodium-Potassium-Exchanging ATPase

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


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