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Demystified ... Nitric oxide

Correspondence to:
Dr K Stuart-Smith, Department of Anaesthesia, Birmingham Heartlands Hospital, Bordesley Green East, Birmingham B9 5SS, UK;
stuartk{at}heartsol.wmids.nhs.uk

ABSTRACT
The discovery of nitric oxide (NO) demonstrated that cells could communicate via the manufacture and local diffusion of an unstable lipid soluble molecule. Since the original demonstration of the vascular relaxant properties of endothelium derived NO, this fascinating molecule has been shown to have multiple, complex roles within many biological systems. This review cannot hope to cover all of the recent advances in NO biology, but seeks to place the discovery of NO in its historical context, and show how far our understanding has come in the past 20 years. The role of NO in mitochondrial respiration, and consequently in oxidative stress, is described in detail because these processes probably underline the importance of NO in the development of disease.

Abbreviations: EDRF, endothelium dependent relaxing factor; eNOS, endothelial nitric oxide synthase; iNOS, inducible nitric oxide synthase; nNOS, neuronal nitric oxide synthase; NO, nitric oxide; NOS, nitric oxide synthase; ROS, reactive oxygen species

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