Blocking NO synthesis: how, where and why?

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Abstract
Nitric oxide (NO) is a key physiological mediator, and the association of disordered NO generation with many pathological conditions has led to much interest in pharmacologically modulating NO levels. However, the wide range of processes in which NO has been implicated, and the fact that increases or decreases in NO levels might be therapeutically desirable depending on the condition or even at different stages of the same condition, pose considerable challenges for drug development. Here, we focus on the rationale and potential for approaches that reduce NO synthesis, which have led to the development of several compounds that will shortly be entering clinical trials.