The role of glutathione in the transport and catabolism of nitric oxide

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Nitric oxide acts as a neuronal and vascular messenger implying diffusion through intracellular environments containing 5–10 mM glutathione. Nitric oxide reacts with glutathione under aerobic conditions generating S-nitrosoglutathione (GSNO). GSNO reacts with glutathione ( k = 8.3 × 10 −3 M −1 · s −1) to generate nitrous oxide and glutathione disulfide (GSSG). Anaerobically, glutathione reacts with nitric oxide generating nitrous oxide and GSSG ( k = 4.8 × 10 −4 s −1 at 5 mM GSH). In both aerobic and anaerobic situations the nitroxyl anion may be an intermediate in the synthesis of nitrous oxide and, under aerobic conditions, nitroxyl anion may generate peroxynitrite. We present a hypothesis for the intracellular interaction between nitric oxide and glutathione.