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- W1489389457 abstract "Na+-dependent GSH transport in basal-lateral membrane vesicles from rat kidney exhibited saturation kinetics while Na+-independent flux increased linearly up to 10 mM GSH. Inhibitor studies showed that GSH transport was not dependent upon the catalytic activity of gamma-glutamyltransferase. K+, choline and NH+4 ions did not stimulate GSH transport, but Li+ partially substituted for Na+. Na+-dependent GSH transport was inhibited by other gamma-glutamyl amino acids. The membrane also showed Na+-dependent transport of glutathione disulfide (GSSG) and gamma-glutamylglutamate. These results show that specificity resides in the gamma-glutamyl moiety and suggest that this system may be a general transport system for gamma-glutamyl compounds. Results from four types of experiments showed that Na+-dependent GSH transport was electrogenic. Transport was stimulated by negative and inhibited by positive valinomycin-induced K+ diffusion potentials; the transport rate was influenced by the anion component of the Na+ salt in the order NaSCN greater than NaCl greater than Na2SO4; analysis of the Na+ concentration dependence indicated coupling of at least 2 Na+/GSH; comparison of GSH-dependent Na+ transport and Na+-dependent GSH transport gave a Na+:GSH stoichiometry of 2:1. Thus, energy is coupled to the transport of GSH in the form of the cellular Na+ gradient and the membrane potential. This system, if it functions in vivo, can act as a mechanism for extraction of GSH from the renal circulation." @default.
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- W1489389457 date "1984-12-01" @default.
- W1489389457 modified "2023-10-18" @default.
- W1489389457 title "Renal glutathione transport. Characteristics of the sodium-dependent system in the basal-lateral membrane." @default.
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- W1489389457 doi "https://doi.org/10.1016/s0021-9258(17)42629-9" @default.
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