Abstract
Nitroxyl (HNO), the one electron reduced and protonated congener of nitric oxide, is emerging as a novel nitrogen oxide with distinct chemistry and biological actions as compared with its redox sibling. The "thiophilic" nature of HNO underlies many of its unique properties, and attention has been focused on its regulation of cellular function and therapeutic potential, particularly in the treatment of cardiovascular disease. The present Forum issue summarizes the intriguing chemistry and biology of HNO and highlights its impact in the cardiovascular and central nervous systems. Recent advances in the development of new HNO donors and their potential use as tools to study HNO signaling and therapeutic agents are discussed. Evidence is also provided for a role of HNO as a putative, endogenous regulator of vascular function. However, as highlighted in this Forum issue, the development of sensitive methods for HNO detection in a biological system is needed to conclusively prove its in vivo generation. As research expands in this area, it is likely that new targets and pharmacological applications of HNO will be discovered.
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