Reactive Oxygen Species scavenging activity (ROS scavenging)

Reactive Oxygen Species (ROS) scavenging activity encompasses the biological mechanisms that neutralize potentially harmful reactive oxygen species. ROS scavenging mechanisms can be classified into two main types: enzymatic and non-enzymatic antioxidant defense systems, which work synergistically to maintain ROS homeostasis[1][5]. The enzymatic systems primarily include superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and glutathione peroxidase (GPX)[1][4]. SOD converts hydroxyl radicals to hydrogen peroxide, which is then converted to water and oxygen by peroxidase and CAT[1]. The non-enzymatic systems involve low molecular weight antioxidants such as glutathione, ascorbic acid, and flavonoids, which remove hydroxyl radicals and singlet oxygen[1][5]. ROS play dual roles in biological systems. At low levels, they function as important signaling molecules involved in cell differentiation, proliferation, apoptosis, and pathogen defense[2][7]. However, when ROS levels exceed the capacity of scavenging systems, cells enter an oxidative state that can cause damage to DNA, proteins, and lipids, potentially leading to various diseases including neurodegenerative disorders, cancer, and aging[2][3][7]. In plants, ROS scavenging is crucial for stress tolerance and response to environmental challenges such as drought, salinity, UV radiation, and pathogen attacks[2][4]. In mammals, ROS scavenging mechanisms are essential for immune function, normal cellular processes, and prevention of oxidative stress-related diseases[5][7]. The regulation of ROS scavenging activity occurs through various signaling pathways, including MAPK cascades, which can activate antioxidant enzymes in response to oxidative stress[4]. Understanding these mechanisms is important for developing therapeutic strategies targeting oxidative stress-related conditions[7].

Other names

Antioxidant defense systemROS detoxificationFree radical scavengingOxidative stress response

Enzymatic conversion of ROS to less harmful molecules; Direct scavenging of free radicals; Singlet oxygen quenching; Redox reactions for ROS elimination; Induction of antioxidant enzymes.