Peroxynitrite and related reactive nitrogen species (RNS)

Peroxynitrite and related reactive nitrogen species (RNS) are highly reactive molecules derived from nitric oxide and superoxide, playing a critical role in nitrosative stress (Pacher et al., 2007, Physiol Rev). Peroxynitrite (ONOO-) is a potent oxidant and nitrating agent that can damage a wide array of cellular components, including lipids, DNA, and proteins, often leading to the formation of 3-nitrotyrosine (Radi, 2013, J Biol Chem). While RNS are involved in the immune system's antimicrobial defense, their chronic overproduction is linked to the progression of various diseases such as Alzheimer's, Parkinson's, and atherosclerosis (Szabó et al., 2007, Nat Rev Drug Discov). Therapeutic approaches targeting these species include the use of scavengers like ebselen, catalytic decomposers such as metalloporphyrins, and inhibitors of nitric oxide synthase to reduce precursor availability (Sies and Arteel, 2000, Free Radic Biol Med). Effective management of RNS levels is essential for preventing cellular dysfunction and death in inflammatory and degenerative conditions. These species are often targeted in the context of ischemia-reperfusion injury and chronic inflammatory states where oxidative damage is a primary driver of pathology.

Other names

PeroxynitriteONOO-Reactive nitrogen speciesNitrosative stress mediatorsPeroxonitriteHydrogen oxoperoxonitrate

Direct scavenging of reactive species, catalytic decomposition of peroxynitrite into inactive nitrate, or inhibition of precursor enzymes like inducible nitric oxide synthase (iNOS) to prevent RNS formation.