Glutamine and α-ketoglutarate as glutamate sources for glutathione synthesis in human erythrocytes

Stephney Whillier, Barbara Garcia, Bogdan E. Chapman, Philip W. Kuchel, Julia E. Raftos*

*Corresponding author for this work

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Glutathione (GSH) is an intracellular antioxidant synthesized from glutamate, cysteine and glycine. The human erythrocyte (red blood cell, RBC) requires a continuous supply of glutamate to prevent the limitation of GSH synthesis in the presence of sufficient cysteine, but the RBC membrane is almost impermeable to glutamate. As optimal GSH synthesis is important in diseases associated with oxidative stress, we compared the rate of synthesis using two potential glutamate substrates, α-ketoglutarate and glutamine. Both substrates traverse the RBC membrane rapidly relative to many other metabolites. In whole RBCs partially depleted of intracellular GSH and glutamate, 10 mm extracellular α-ketoglutarate, but not 10 mm glutamine, significantly increased the rate of GSH synthesis (0.85 ± 0.09 and 0.61 ± 0.18 μmol·(L RBC) -1·min -1, respectively) compared with 0.52 ± 0.09 μmol·(L RBC) -1·min -1 for RBCs without an external glutamate source. Mathematical modelling of the situation with 0.8 mm extracellular glutamine returned a rate of glutamate production of 0.36 μmol·(L RBC) -1·min -1, while the initial rate for 0.8 mmα-ketoglutarate was 0.97 μmol·(L RBC) -1·min -1. However, with normal plasma concentrations, the calculated rate of GSH synthesis was higher with glutamine than with α-ketoglutarate (0.31 and 0.25 μmol·(L RBC) -1·min -1, respectively), due to the substantially higher plasma concentration of glutamine. Thus, a potential protocol to maximize the rate of GSH synthesis would be to administer a cysteine precursor plus a source of α-ketoglutarate and/or glutamine.

Original languageEnglish
Pages (from-to)3152-3163
Number of pages12
JournalFEBS Journal
Volume278
Issue number17
DOIs
Publication statusPublished - Sep 2011

    Fingerprint

Cite this