Journal
CELLULAR SIGNALLING
Volume 69, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cellsig.2020.109547
Keywords
Retinal; Blue light; Reactive oxygen species; Singlet oxygen; Rose bengal; Lipid peroxidation; G proteins; Ras; Signal transduction; PIP2; Farnesyl; Geranylgeranyl
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Funding
- University of Toledo
- NIH-NIGMS [1R15GM126455-01A1]
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The chemical- and photo- toxicity of chromophore retinal on cells have long been debated. Although we recently showed that retinal and blue light exposure interrupt cellular signaling, a comprehensive study examining molecular underpinnings of this perturbation and its consequences to cellular fate is lacking. Here, we report molecular evidence for blue light excited-retinal induced oxidative damage of polyunsaturated lipid anchors in membrane-interacting signaling molecules and DNA damage in cells using live-cell imaging and in vitro experimentation. The incurred molecular damage irreversibly disrupted subcellular localization of these molecules, a crucial criterion for their signaling. We further show retinal accumulation in lipid-bilayers of cell membranes could enhance the lifetime of retinal in cells. Comparative response-signatures suggest that retinal triggers reactions upon photoexcitation similar to photodynamic therapy agents and generate reactive oxygen species in cells. Additionally, data also shows that exposing retinal-containing cells to sunlight induces substantial cytotoxicity. Collectively, our results explain a likely in vivo mechanism and reaction conditions under which bio-available retinal in physiological light conditions damages cells.
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