کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2485679 1114363 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Metabolic Bioactivation and Toxicity of Ethyl 4-Hydroxybenzoate in Human SK-MEL-28 Melanoma Cells
موضوعات مرتبط
علوم پزشکی و سلامت داروسازی، سم شناسی و علوم دارویی اکتشاف دارویی
پیش نمایش صفحه اول مقاله
Metabolic Bioactivation and Toxicity of Ethyl 4-Hydroxybenzoate in Human SK-MEL-28 Melanoma Cells
چکیده انگلیسی
The metabolism and toxicity of ethyl 4-hydroxybenzoate (4-HEB) were investigated in vitro using tyrosinase enzyme, a melanoma molecular target, and CYP2E1 induced rat liver microsomes, and in human SK-MEL-28 melanoma cells. The results were compared to 4-hydroxyanisole (4-HA). At 90 min, 4-HEB was metabolized 48% by tyrosinase and 26% by liver microsomes while the extent of 4-HA metabolism was 196% and 88%, respectively. The IC50 (day 2) of 4-HEB and 4-HA towards SK-MEL-28 cells were 75 and 50 µM, respectively. Dicoumarol, a diaphorase inhibitor, and 1-bromoheptane, a GSH depleting agent, increased 4-HEB toxicity towards SK-MEL-28 cells indicating o-quinone formation played an important role in 4-HEB induced cell toxicity. Addition of ascorbic acid and GSH to the media was effective in preventing 4-HEB cell toxicity. Cyclosporin A and trifluoperazine, inhibitors of permeability transition pore in mitochondria, were significantly potent in inhibiting 4-HEB cell toxicity. 4-HEB caused time-dependent decline in intracellular GSH concentration which preceded cell death. 4-HEB also led to reactive oxygen species (ROS) formation in melanoma cells which exacerbated by dicoumarol and 1-bromoheptane whereas cyclosporin A and trifluoperazine prevented it. Our findings suggest that the mechanisms of 4-HEB toxicity in SK-MEL-28 were o-quinone formation, intracellular GSH depletion, ROS formation and mitochondrial toxicity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Pharmaceutical Sciences - Volume 97, Issue 5, May 2008, Pages 1934-1945
نویسندگان
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