Abstract
Some photosensitizing drugs can cause phototoxic skin responses even after systemic administration; therefore, avoidance of undesired side-effects is a key consideration in drug discovery and development. As a prediction tool for phototoxic risk, we previously proposed the monitoring of reactive oxygen species (ROS) generated from compounds irradiated with UVA/B, which can be effective for understanding photochemical/photobiological properties. In this investigation, we evaluated the photosensitizing properties of a novel dihydropyridine derivative, with bradykinin B(2) receptor antagonist activity (compound A) using our ROS assay and several analytical/biochemical techniques. Exposure of compound A, and several dihydropyridine-type calcium channel antagonists to simulated sunlight resulted in the significant production of singlet oxygen, superoxide, or both, which indicates their photosensitive/phototoxic potential. This is consistent with the observation that compound A under UVA/B light exposure caused significant photodegradation and even peroxidation of fatty acid, which could lead to phototoxic dermatitis. Interestingly, the addition of radical scavengers, especially GSH, MPG and BHA, could attenuate the lipid peroxidatio...Continue Reading
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