Please use this identifier to cite or link to this item:
|Title:||Mechanism of clofibrate hepatotoxicity: Mitochondrial damage and oxidative stress in hepatocytes|
Mitochondrial membrane potential
|Source:||Qu, B., Li, Q.-T., Wong, K.P., Tan, T.M.C, Halliwell, B. (2001). Mechanism of clofibrate hepatotoxicity: Mitochondrial damage and oxidative stress in hepatocytes. Free Radical Biology and Medicine 31 (5) : 659-669. ScholarBank@NUS Repository. https://doi.org/10.1016/S0891-5849(01)00632-3|
|Abstract:||Peroxisome proliferators have been found to induce hepatocarcinogenesis in rodents, and may cause mitochondrial damage. Consistent with this, clofibrate increased hepatic mitochondrial oxidative DNA and protein damage in mice. The present investigation aimed to study the mechanism by which this might occur by examining the effect of clofibrate on freshly isolated mouse liver mitochondria and a cultured hepatocyte cell line, AML-12. Mitochondrial membrane potential (ΔΨm) was determined by using the fluorescent dye 5,5′,6,6′-tetrachloro-1,1′, 3,3′-tetraethyl-benzimidazolylcarbocyanine iodide (JC-1) and tetramethylrhodamine methyl ester (TMRM). Application of clofibrate at concentrations greater than 0.3 mM rapidly collapsed the ΔΨm both in liver cells and in isolated mitochondria. The loss of ΔΨm occurred prior to cell death and appeared to involve the mitochondrial permeability transition (MPT), as revealed by calcein fluorescence studies and the protective effect of cyclosporin A (CsA) on the decrease in ΔΨm. Levels of reactive oxygen species (ROS) were measured with the fluorescent probes 5-(and-6)-carboxy-2′,7′-dichlorofluorescein diacetate (DCFDA) and dihydrorhodamine 123 (DHR123). Treatment of the hepatocytes with clofibrate caused a significant increase in intracellular and mitochondrial ROS. Antioxidants such as vitamin C, deferoxamine, and catalase were able to protect the cells against the clofibrate-induced loss of viability, as was CsA, but to a lesser extent. These results suggest that one action of clofibrate might be to impair mitochondrial function, so stimulating formation of ROS, which eventually contribute to cell death. © 2001 Elsevier Science Inc.|
|Source Title:||Free Radical Biology and Medicine|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Dec 11, 2017
WEB OF SCIENCETM
checked on Dec 11, 2017
checked on Dec 9, 2017
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.