Document Detail


Biliary amino acid excretion in rats before and after bilateral nephrectomy.
MedLine Citation:
PMID:  1286095     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In previous studies it could be shown that after bilateral nephrectomy (NX) the excretory function of the liver is disturbed. To further clarify whether or not this "renohepatic syndrome" is caused by toxic effects of uremia or by competition phenomena between various uraemic toxins an additional aspect was investigated: the biliary excretion of endogenous amino acids. Furthermore, previously it could be shown that renal and hepatic excretory functions overlap. Therefore, the renal excretion of effectively biliary eliminated amino acids (glutamic acid, alanine, tyrosine, isoleucine) is very low and vice versa. That means, that the renal excretion of amino acids with low hepatic elimination (tryptophan, citrulline, lysine, taurine) dominates. The hepatic excretion of amino acids is hardly altered after NX. Remarkably, the removal of both kidneys is followed by a distinct reduction in amino acid plasma concentrations, especially if these concentrations are relatively high in the controls. Interestingly, there is no correlation between plasma concentrations and biliary excretion of amino acids. But the calculation of the bile to plasma concentration ratios of amino acids makes it possible to differentiate three groups of amino acids: Amino acids excreted actively into bile (ratio > or = 1), amino acids with ratios below 1, indicating effective retention, and amino acids with ratios of about 1, whose hepatic handling is passive. After NX these ratios tended to approach 1; low ratios increased and high ratios decreased. That means, active processes involved in excretion or retention are obviously disturbed. These changes could indicate uraemic liver damage as proved regarding influence of NX on hepatic excretion of other endogenous substances and xenobiotics.
Authors:
C Fleck
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Physiological research / Academia Scientiarum Bohemoslovaca     Volume:  41     ISSN:  0862-8408     ISO Abbreviation:  Physiol Res     Publication Date:  1992  
Date Detail:
Created Date:  1993-03-12     Completed Date:  1993-03-12     Revised Date:  2008-04-02    
Medline Journal Info:
Nlm Unique ID:  9112413     Medline TA:  Physiol Res     Country:  CZECHOSLOVAKIA    
Other Details:
Languages:  eng     Pagination:  273-8     Citation Subset:  IM    
Affiliation:
Institute of Pharmacology and Toxicology, University of Jena, Germany.
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MeSH Terms
Descriptor/Qualifier:
Amino Acids / blood,  metabolism*,  urine
Animals
Bile / chemistry
Gallbladder / secretion*
Kidney / secretion
Liver / secretion
Male
Nephrectomy / adverse effects*
Rats
Rats, Wistar
Chemical
Reg. No./Substance:
0/Amino Acids

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


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