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Enhanced Expression of Plasma Glutathione Peroxidase in the Thymus of Mice Treated with TCDD and Its Implication for TCDD-induced Thymic Atrophy  

Cho, Hyun-Jin (Department of Biology, Changwon National University)
Hahn, Eun-Jin (Department of Biology, Changwon National University)
Hwang, Ju-Ae (Department of Biology, Changwon National University)
Hong, Min-Sun (Department of Biology, Changwon National University)
Kim, Sook-Kyung (Department of Biology, Changwon National University)
Pak, Hye-Ryun (Department of Biology, Changwon National University)
Park, Joo-Hung (Department of Biology, Changwon National University)
Publication Information
Molecules and Cells / v.21, no.2, 2006 , pp. 276-283 More about this Journal
Abstract
The potent environmental contaminant, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), induces thymus atrophy in experimental animals. However, its mechanism of action is not fully understood. To gain insight into its immunosuppressive effect, Balb/c mice were intraperitoneally injected with TCDD ($30{\mu}g/kg$ body weight) and genes regulated by TCDD were identified using cDNA arrays [Park and Lee (2002)]. One of the regulated genes was that for plasma glutathione peroxidase (pGPx). Upon TCDD injection, pGPx mRNA levels in the thymus increased, in parallel with increases in GPx activity and the frequency of anti-human pGPx antibody-reactive cells. pGPX mRNA levels were also moderately up-regulated in the testis and spleen. This is the first report that a particular isotype of the glutathione peroxidase family is regulated by TCDD at both mRNA and protein levels. pGPx is expressed in various tissues in contact with body fluids, and detoxifies hydrogen peroxides and lipid hydroperoxides. It will be of interest to assess the role of pGPx in TCDD-induced thymic atrophy.
Keywords
Oxidative Stress; Plasma Glutathione Peroxidase; TCDD; Thymic Atrophy;
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