Journal Article

Free amino acids in plasma, red blood cells, polymorphonuclear leukocytes, and muscle in normal and uraemic children

Alberto Canepa, José Carolino Divino Filho, Alberto Gutierrez, Alba Carrea, Ann‐Marie Forsberg, Eva Nilsson, Enrico Verrina, Francesco Perfumo and Jonas Bergström

in Nephrology Dialysis Transplantation

Published on behalf of European Renal Association - European Dialysis and Transplant Assoc

Volume 17, issue 3, pages 413-421
Published in print March 2002 | ISSN: 0931-0509
Published online March 2002 | e-ISSN: 1460-2385 | DOI:
Free amino acids in plasma, red blood cells, polymorphonuclear leukocytes, and muscle in normal and uraemic children

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Background. The aims of this study were to investigate free amino acid (AA) concentrations in plasma, red blood cells (RBC), polymorphonuclear granulocytes (PMN), and muscle, sampled at the same time, in normal and uraemic children.

Methods. Twelve apparently well‐nourished chronically uraemic children (five females) aged a mean of 9.4±4.8 (range 1.7–17.7) years and 13 age‐matched normal children were studied. Venous blood and muscle samples for AA analyses were taken simultaneously after an overnight fast.

Results. The intracellular AA patterns in the three cellular compartments were qualitatively similar, but the absolute intracellular concentrations were higher in muscle than in PMN, which had higher values than in RBC. The AA patterns in plasma, RBC, PMN, and muscle in the uraemic children have many similarities; typical features being low branched‐chain AA (BCAA), tyrosine, and serine concentrations and variably high concentrations of some non‐essential AA. Among the individual AA, there were only few correlations between their concentrations in the three cell compartments.

Conclusions. The lack of correlation between the concentrations in RBC, PMN, and muscle for most of the AA indicates that there is no close association in the same subject between individual free AA concentrations in various types of cells, presumably because of differences in metabolism and function. Consequently, one should be cautious in assuming that AA concentrations, determined in RBC or PMN, reflect the concentrations in muscle cells. Therefore, these preliminary observations do not support the hypothesis that RBC and PMN AA analysis can be considered as a suitable alternative to muscle AA determination.

Keywords: amino acids; leukocytes; muscle; plasma; red blood cells; uraemic children

Journal Article.  4726 words. 

Subjects: Nephrology

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