Abstract
Glutathione (GSH; γ-glutamylcysteinylglycine) is ubiquitous in mammalian and other living cells. It has several important functions, including protection against oxidative stress. It is synthesized from its constituent amino acids by the consecutive actions of γ-glutamylcysteine synthetase and GSH synthetase. γ-Glutamylcysteine synthetase activity is modulated by its light subunit and by feedback inhibition of the end product, GSH. Treatment with an inhibitor, buthionine sulfoximine (BSO), of γ-glutamylcysteine synthetase leads to decreased cellular GSH levels, and its application can provide a useful experimental model of GSH deficiency. Cellular levels of GSH may be increased by supplying substrates and GSH delivery compounds. Increasing cellular GSH may be therapeutically useful.
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