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Uptake and Utilization of Selenium from Selenoprotein P
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Uptake and Utilization of Selenium from Selenoprotein P
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Uptake and Utilization of Selenium from Selenoprotein P
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Journal Article
Uptake and Utilization of Selenium from Selenoprotein P
2018
Overview
Selenoprotein P (SELENOP) is a serum glycoprotein that is required for proper selenium distribution in mammals, particularly in supplying selenium to the brain and testes. As the sole mechanism for providing essential selenium to developing spermatozoa, SELENOP metabolism is central to male fertility in all mammals. In addition, this process is important for proper brain function, especially under conditions of limited dietary selenium. Several specific and nonspecific mechanisms for SELENOP uptake in target tissues have been described, but the utilization of SELENOP as a source of selenium for intracellular selenoprotein production has not been systematically characterized. In this report, we examine the process of SELENOP uptake using a robust selenium uptake assay that measures selenium utilization in cells fed 75Se-SELENOP. Using a series of inhibitors and modulators we have identified specific regulators of the process and found that SELENOP must be in an oxidized state for uptake. This assay also demonstrates that SELENOP uptake is not highly sequence specific as the zebrafish protein is recognized and processed by mammalian cells.
