Radiation-induced in vitro phototoxic potential of some fluoroquinolones.
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| Abstract |
Photosensitizing drugs that can damage cellular biomolecules is a matter of concern. Lomefloxacin, norfloxacin, ofloxacin, and enoxacin (broad-spectrum antibiotics of fluoroquinolone group) are used for the treatment of Gram-positive and Gram-negative bacterial infections. Phototoxicity and possible mechanism of their action was assessed under the exposure of ambient levels of UV-A, UV-B, and sunlight at a concentration generally used in the treatment of various diseases. Singlet oxygen (1O2), superoxide anion radical (O2.-) generation, DNA damage, and lipid peroxidation in human blood were studied. All the fluoroquinolones tested in this study produced 1O2 and O2.- under exposure to UV-A, UV-B, and sunlight depending on the concentrations (0 to 60 microg/mL) of the drugs. Enoxacin showed a higher yield of 1O2 and O2.- than other drugs. These materials also degraded deoxyguanosine and induced lipid peroxidation in vitro under exposure to UV-A, UV-B, and sunlight (depending on the dose of radiation). The formation of the reactive oxygen species (ROS) by the photoexcited drugs may be considered as a possible mechanism of their action.
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| Authors | R S Ray, N Agrawal, R B Misra, M Farooq, R K Hans |
| Journal | Drug and chemical toxicology (Drug Chem Toxicol) Vol. 29 Issue 1 Pg. 25-38 (Jan 2006) ISSN: 0148-0545 [Print] United States |
| PMID | 16455588 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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