Abstract
Objective: To investigate glutathione and amino acids related to glutathione metabolism in patients with anorexia nervosa in order to test the hypothesis that these patients exhibit a deficiency of glutathione and therefore might be at an increased risk of developing toxic liver injury.
Design: Controlled observatory study and case report.
Setting: University Hospital.
Subjects: Subjects included 11 female patients with anorexia nervosa and 12 healthy female controls.
Interventions: Determination of fasting free and total glutathione, homocysteine, vitamins B6 and B12 and folic acid in plasma.
Results: A 14-y-old patient with a body mass index of 12.6 kg/m2 presented with markedly elevated transaminases (ALAT >50 × upper limit of normal), and paracetamol was detected in her blood. Patients with anorexia nervosa exhibited lower circulating concentrations of free cysteine (8.9±1.5 vs 12.0±1.4 μmol/l) and free and total glutathione (5.0±1.3 vs 7.1±1.2 and 11.2±3.8 vs 16.2±5.0 μmol/l, respectively). The plasma concentrations of homocysteine (17.5±4.9 vs 12.0±3.8 μmol/l) and also of glycine (194±37 vs 143±41 μmol/l) and glutamine (422±51 vs 353±51 μmol/l) were significantly higher in patients with anorexia nervosa who were not deficient in folic acid, vitamin B6 and B12.
Conclusions: Lower plasma concentrations of glutathione suggest lower intracellular concentrations of the tripeptide. Higher homocysteine, glycine and glutamine concentrations point to a decreased utilization of these amino acids for glutathione synthesis and an impairment of trans-sulfuration. Consequently, the capacity of patients with anorexia nervosa to detoxify electrophilic metabolites and reactive oxygen species via glutathione may be impaired.
Sponsorship: Supported by Grant 32-52608.97 from the Swiss National Foundation for Scientific Research.
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Zenger, F., Russmann, S., Junker, E. et al. Decreased glutathione in patients with anorexia nervosa. Risk factor for toxic liver injury?. Eur J Clin Nutr 58, 238–243 (2004). https://doi.org/10.1038/sj.ejcn.1601772
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DOI: https://doi.org/10.1038/sj.ejcn.1601772
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