Toxicity of oxidized β-carotene to cultured human cells
- 作者：John S. Hurst ; Manjit K. Saini ; Gui-Fang Jin ; Yogesh C. Awasthi and Frederik J.G.M. van Kuijk
- 关键词：retinal pigment epithelial cells ; K562 cells ; carotenoid derived aldehydes ; oxidative stress ; β ; -carotene
- 刊名：Experimental Eye Research
- 出版年：2005
- 期刊代码：293_00144835
- 类别：med
- 出版时间：2005
- 卷：81
- 期：2
- 页码：239-243
- 文件大小：131 K
摘要
Carotenoids are effective antioxidants in vitro, but they are also susceptible to autoxidation, which generates volatile and biologically active aldehydes and ketones. In a previous study, we showed that autoxidized β-carotene inhibits Na+–K+-ATPase activity more effectively than aldehydic products derived from lipid peroxidation, such as 4-hydroxynonenal. In this study, we compared mitochondrial dysfunction in cultured human K562 erythroleukaemic and 28 SV4 retinal pigment epithelium (RPE) cells in response to the degradation products of β-carotene autoxidation using the MTT assay. We found that oxidized β-carotene is cytotoxic and that mitochondrial function is decreased in both K562 and RPE cells. In addition, the RPE cells were more resistant to this form of oxidative stress, suggesting that its cytotoxicity may depend on cellular antioxidant capacity.