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Studies on amino acids (a.a.) in plasma and erythrocytes in patients with hematological disorders

Erythrocyte and plasma levels of most a.a. are similar. Aspartic acid and glutathione are present in red cells and absent in plasma, while glutamic acid and serine are more concentrated intracellularly. Cystine, methionine and arginine are more concentrated in plasma than in the cells. Plasma and erythrocyte a.a. have been determined in patients with hemolytic anemia and in patients with impaired erythropoiesis. Both in patients and controls, hydroxyproline, proline, cystine, methionine and tryptophan were not detected in the cells. Higher concentrations of valine, isoleucine, leucine, phenylalanine, lysine and arginine were found in plasma than in cells. In the patients, intraerythrocytic glycine, taurine and asparagine were increased, while threonine, tyrosine and histidine were decreased. There was no difference between the 2 groups of anemia. These results suggest that there are other transport mechanisms for the a.a. in the red cell membrane than in the mucosal and kidney tubular cells.