Nitrosative stress refers to the joint biochemical reactions of nitric oxide (NO) and superoxide (O2–) when an oxygen metabolism disorder occurs in the body.
What causes Nitrosative stress?
Nitric oxide (NO) is involved in many physiological functions of higher plants. Under stress conditions, a family of NO-derived molecules, called reactive nitrogen species (RNS), can cause nitrosative stress. Reactive oxygen species (ROS) participate in the generation of oxidative stress.
Is peroxynitrite a reactive nitrogen species?
Reactive nitrogen species (RNS) include peroxynitrite and its reaction products, such as NO2.
What does the oxidative stress and nitrosative stress mean?
The increase in ROS and RNS production or the decrease in antioxidant mechanisms generates a condition called oxidative and nitrosative stress, respectively, defined as the imbalance between pro- and antioxidants in favor of the oxidants. On the other hand, ischemia in placenta in PE reduces the antioxidant activity.
What do you understand by antioxidant?
Antioxidants are compounds that inhibit oxidation, a chemical reaction that can produce free radicals and chain reactions that may damage the cells of organisms. Antioxidants such as thiols or ascorbic acid (vitamin C) may act to inhibit these reactions.
What is NOS in oxidative stress?
Nitric oxide (NO), a product of the normal endothelium, is a principal determinant of normal endothelial and vascular function. In states of inflammation, NO production by the vasculature increases considerably and, in conjunction with other ROS, contributes to oxidative stress.
What is ROS and NOS?
Reactive nitrogen species (RNS) are a family of antimicrobial molecules derived from nitric oxide (•NO) and superoxide (O2•−) produced via the enzymatic activity of inducible nitric oxide synthase 2 (NOS2) and NADPH oxidase respectively. Therefore, these two species are often collectively referred to as ROS/RNS.
Is there a role for NSSR in nitrosative stress response?
However, since the expression of NssR is only very modestly increased under nitrosative stress conditions (Elvers et al., 2005 ), this suggests a role for NssR as an NO sensor and regulator of the response. In the C. jejuni genome, the − 35 regions for σ 70 -controlled promoters are not conserved ( Petersen, Larsen, Ussery, On, & Krogh, 2003 ).
How does nitnitrosative stress affect apoptosis?
Nitrosative stress decreased the Cdc25A-bound fraction of apoptosis signal-regulating kinase 1 (ASK-1), which is involved in the control of cellular proliferation, differentiation, and survival, and sensitized cells to cisplatin-induced apoptosis, which also activates ASK-1 [54].
How does nitnitration produce peroxynitrite?
Nitration implies the production of peroxynitrite, a product of the reaction between NO and superoxide. Since superoxide production has been demonstrated for other bacterial haemoglobins ( Membrillo-Hernandez, Ioannidis, & Poole, 1996 ), production of this compound by the oxyferrous form of Ctb seems plausible.
