Document Detail


Effect of hemodialysis on protein synthesis.
MedLine Citation:
PMID:  11076104     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Earlier studies have shown that hemodialysis (HD) treatment stimulates net protein catabolism. Several factors associated with HD affect protein catabolism, such as an inflammatory effect due to blood-membrane contact and loss of amino acids and glucose into the dialysate. SUBJECTS, MATERIAL AND METHODS: We have studied protein synthesis in skeletal muscle of healthy volunteers (n = 9) before and after a single heparin-free HD. Protein synthesis (PS) was studied, using 2 independent techniques: the incorporation of labeled 2H5-phenylalanine into muscle protein, which gives a quantitative measure of the fractional synthesis rate of muscle proteins, and the concentration and size distribution of ribosomes, which gives a qualitative estimate of protein synthesis. Furthermore, free amino acid concentrations were determined in muscle and plasma. RESULTS: The rate of PS, expressed as the fractional synthesis rate, decreased by 13% during HD (p < 0.02). The capacity for PS, as reflected by the total concentration of ribosomes, was reduced by 22% (p < 0.02) and the activity of PS, expressed as the relative proportion of polyribosomes, decreased from 48.4 +/- 0.9% to 44.8 +/- 0.8% after dialysis (p < 0.01). There was a total loss of 5.8 +/- 0.3 g amino acid to the dialysate. Plasma and muscle free amino acid concentrations were determined at four time points; before and after the phenylalanine incorporation period, before dialysis and before and after the second incorporation period after dialysis. Immediately after dialysis, there was a decrease in plasma asparagine, histidine, alanine, taurine, valine and tryptophane. In muscle, no changes occurred except for a slight increase in leucine after dialysis. In blood, the glucose concentration decreased and the total amount of glucose lost to the dialysate was 21 +/- 3.0 g. In summary, one single hemodialysis treatment decreases fractional protein synthesis rate in skeletal muscle. CONCLUSION: The results demonstrate substantial losses of amino acids and glucose to the dialysate and decreased amino acid concentrations in plasma, but only minimal changes in the intracellular amino acid concentrations in muscle, suggesting that the decreased PS is caused not by lack of amino acid precursors at the site of the synthesis activity, but by other mechanisms.
Authors:
E Löfberg; P Essén; M McNurlan; J Wernerman; P Garlick; B Anderstam; J Bergström; A Alvestrand
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical nephrology     Volume:  54     ISSN:  0301-0430     ISO Abbreviation:  Clin. Nephrol.     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2000-11-28     Completed Date:  2001-06-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0364441     Medline TA:  Clin Nephrol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  284-94     Citation Subset:  IM    
Affiliation:
Department of Clinical Science, Huddinge University Hospital, Karolinska Institute, Stockholm, Sweden.
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MeSH Terms
Descriptor/Qualifier:
Adult
Amino Acids / analysis,  blood
Blood Glucose / analysis
Dialysis Solutions / chemistry
Female
Hormones / blood
Humans
Leukocyte Count
Male
Muscle Proteins / biosynthesis*
Muscles / chemistry
Renal Dialysis*
Urea / analysis
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Blood Glucose; 0/Dialysis Solutions; 0/Hormones; 0/Muscle Proteins; 57-13-6/Urea

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


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