Reactive Oxygen Species Generation via Light Activation

Reactive oxygen species (ROS) are highly reactive molecules derived from molecular oxygen. The generation of ROS via light activation refers to the process by which exposure to specific wavelengths of light induces the formation of these reactive species within biological systems. This process involves photon absorption by chromophores, leading to electron excitation and transfer to molecular oxygen, resulting in the production of various ROS such as superoxide anion, hydrogen peroxide, hydroxyl radicals, and singlet oxygen. In plants, high-intensity light can cause electron leakage from the photosystems, leading to superoxide radical formation. In animal cells, low-level laser therapy enhances mitochondrial respiration and activates redox-sensitive signaling pathways through increased mitochondrial ROS production. Moderate increases in ROS act as secondary messengers, regulating pathways like MAPK cascades and transcription factors. Excessive or uncontrolled generation leads to oxidative damage affecting lipids, proteins, and DNA, potentially resulting in apoptosis or necrosis. This target is central both physiologically—for normal cell signaling—and pathologically when dysregulated due to excessive environmental stressors like intense sunlight or artificial irradiation.

Other names

Light-induced ROS productionPhotodynamic ROS generationPhoto-activated ROS generation

Not applicable, this is a process not a molecule