Cerebral cystine uptake: a tale of two transporters

Transport of cystine across the cell membrane is essential for synthesis of the major cellular aintioxidant glutathione. Cystine uptake in the brain occurs by both the Na+-independent x(c)(-) cystine-glutamate exchanger and the X-AG(-) family of high-affinity, Na+-dependent glutamate transporters. New evidence concerning the role of cystine transport in the defence against oxidative stress is described.