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http://dx.doi.org/10.4162/nrp.2009.3.3.192

Cadmium increases ferroportin-1 gene expression in J774 macrophage cells via the production of reactive oxygen species  

Park, Bo-Yeon (Department of Food and Nutrition and Research Institute of Science for Human Life, Kyung Hee University)
Chung, Ja-Yong (Department of Food and Nutrition and Research Institute of Science for Human Life, Kyung Hee University)
Publication Information
Nutrition Research and Practice / v.3, no.3, 2009 , pp. 192-199 More about this Journal
Abstract
Cadmium intoxication has been associated with the dysregulation of iron homeostasis. In the present study, we investigated the effect of cadmium on the expression of ferroportin 1 (FPN1), an important iron transporter protein that is involved in iron release from macrophages. When we incubated cadmium with J774 mouse macrophage cells, FPN1 mRNA levels were significantly increased in a dose- and time-dependent manner. Furthermore, the cadmium-induced FPN1 mRNA expression was associated with increased levels of FPN1 protein. On the other hand, cadmium-mediated FPN1 mRNA induction in J774 cells was completely blocked when cells were co-treated with a transcription inhibitor, acitomycin D. Also, cadmium directly stimulated the activity of the FPN1-promoter driven luciferase reporter, suggesting that the cadmium up-regulates FPN1 gene expression in a transcription-dependent manner. Finally, cadmium exposure to J774 macrophages increased intracellular reactive oxygen species (ROS) levels by ${\sim}2$-fold, compared to untreated controls. When J774 cells were co-treated with antioxidant N-acetylcystein, the cadmium-induced FPN1 mRNA induction was significantly attenuated. In summary, the results of this study clearly demonstrated that cadmium increased FPN1 expression in macrophages through a mechanism that involves ROS production, and suggests another important interaction between iron and cadmium metabolism.
Keywords
Iron; cadmium; ferroportin 1; macrophages;
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