PMID: 9641271Jun 26, 1998Paper

Singlet molecular oxygen ((1)O2): a possible effector of eukaryotic gene expression

Free Radical Biology & Medicine
S W Ryter, R M Tyrrell

Abstract

Biological processes involving light may have both beneficial (photosynthesis) and destructive (photosensitization) consequences. Singlet molecular oxygen, (1)O2, and other reactive oxygen species such as hydrogen peroxide and hydroxyl radical, arise during the interaction of light with photosensitizing chemicals in the presence of molecular oxygen. (1)O2 oxidizes macromolecules such as lipids, nucleic acids, and protein, depending on its intracellular site of formation; and promotes detrimental processes such as lipid peroxidation, membrane damage, and cell death. Photochemical reactive oxygen species (ROS) generating systems induce the expression of several eukaryotic genes, which include stress proteins, early response genes, matrix metalloproteinases, immunomodulatory cytokines, and adhesion molecules. These gene expression phenomena may belong to cellular defensive mechanisms, or may promote further injury. Whereas the signal transduction pathways that link site-specific oxidative damage and gene expression are poorly understood, ROS may affect signalling components in the membrane, cytosol, or nucleus, leading to changes in phospholipase, cyclooxygenase, protein kinase, protein phosphatase, and transcription factor activi...Continue Reading

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