n-acetyl cysteine (nac), as a nutritional supplement, is a greatly applied antioxidant in vivo and in vitro. nac is a precursor of l-cysteine that results in glutathione elevation biosynthesis. it acts directly as a scavenger of free radicals, especially oxygen radicals. nac is a powerful antioxidant. it is also recommended as a potential treatment option for different disorders resulted from g...

Intracellular singlet oxygen generation in photofrin-loaded cells caused cell death without discrimination between nonmalignant and malignant cells. In contrast, extracellular singlet oxygen generation caused apoptosis induction selectively in tumor cells through singlet oxygen-mediated inactivation of tumor cell protective catalase and subsequent reactivation of intercellular ROS-mediated apop...

Reversible noninvasive control over the generation of singlet oxygen is demonstrated in a bicomponent system comprising a diarylethene photochromic switch and a porphyrin photosensitizer by selective irradiation at distinct wavelengths. The efficient generation of singlet oxygen by the photosensitizer is observed when the diarylethene unit is in the colorless open form. Singlet oxygen generatio...

mycophenolic acid (mpa) is the active metabolite of mycophenolate mofetil. this study designed to investigate the mechanism of cytotoxicity of mpa on the genetically engineered pc12 tet off (pto) neuronal cells with p53 gene. alamar blue (ab) reduction showed concentration-dependent cytotoxicity of mpa on pto cells with ic50 value of 32.32 ± 4.61 mm. the reactive oxygen species (ros) generation...

Objective(s):Gentamicin sulphate (GS) nephrotoxicity seems to be related to the generation of reactive oxygen species. There is evidence that oxygen preconditioning increases the activity of antioxidant enzymes. Materials and Methods: Forty eight female rats were divided into 6 groups (n=8) as follows: group 1 was the control, group 2 received daily GS, groups 3,4 and 5 received oxygen 2 hr/day...

The spectroscopic observation of 1268-nm emission of singlet oxygen photosensitized by tetracyclines in oxygenated solutions at room temperature is reported. In the series demeclocycline, tetracycline, and minocycline, the efficiency of singlet oxygen generation is found to parallel the clinical observation of relative frequency of phototoxicity of these antibiotics, suggesting singlet oxygen g...