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• W2077992148 abstract "Selenoprotein P (SeP) is a highly glycosylated, selenium-rich plasma protein. Aside from its role as selenium carrier protein, an antioxidative function of SeP has been suggested. Astrocytes, which detoxify reactive oxygen species in the brain, were described as potential target cells of SeP. We investigated the expression of SeP in human astrocytes and its involvement in the protection of these cells against tert-butyl hydroperoxide (t-BHP)-induced oxidative damage. We show that primary human astrocytes and the human astrocytoma cell line MOG-G-CCM express SeP as an unglycosylated protein, which is not secreted. SeP expression in astrocytes is constitutive. Preincubation of astrocytes with hepatocyte-derived SeP mimicks the protective effect of low-molecular-weight selenocompounds such as sodium selenite or selenomethionine against oxidative damage, shielding astrocytes from t-BHP-induced cytotoxicity. Selenium supplementation of astrocytes counteracts oxidative stress via an increase in expression and activity of the selenoenzyme cytosolic glutathione peroxidase (cGPx). Furthermore, specific downregulation of SeP expression by small interfering RNA decreases cell viability of human astrocytes and makes them more susceptible to t-BHP-induced cytotoxicity. Our results implicate an antioxidant activity of constitutively expressed SeP in selenium-deficient astrocytes, while during adequate selenium supply the enhanced protection against oxidative stress is exerted by cGPx." @default.
• W2077992148 created "2016-06-24" @default.
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• W2077992148 date "2006-05-01" @default.
• W2077992148 modified "2023-10-01" @default.
• W2077992148 title "Involvement of selenoprotein P in protection of human astrocytes from oxidative damage" @default.
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• W2077992148 doi "https://doi.org/10.1016/j.freeradbiomed.2005.12.022" @default.
• W2077992148 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16632112" @default.
• W2077992148 hasPublicationYear "2006" @default.
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