Cytoprotection against lipid hydroperoxides correlates with increased glutathione peroxidase activities, but not selenium uptake from different selenocompounds

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1999
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Maurer, Stefanie
Schultz, Manfred
Elsner, Angelika
Gawlik, Dieter
Brigelius-Flohé, Regina
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Biological Trace Element Research. Springer. 1999, 68(2), pp. 159-174. ISSN 0163-4984. eISSN 1559-0720. Available under: doi: 10.1007/BF02784404
Zusammenfassung

Cells cultivated under standard conditions were highly deficient in tocopherol, selenium, and glutathione peroxidase (GPx) activities. We investigated whether and to what extent the addition of different selenocompounds to growth media would alter biochemical, physiological, and pathophysiological parameters of cultured liver cells. Cellular uptake of selenium, GPx activities, and cytoprotection were measured and compared in human hepatoma cells (HepG2). Selenite and selenocystine were Se donors of high bioavailability (i.e., with these culture supplements, the increased Se uptake, induction of GPx isoenzymes, and protection of treated cells from lipid hydroperoxides were well correlated). In contrast, selenium from selenomethionine was incorporated into cellular proteins but had no effect on GPx activities or cytoprotection. The data show that not all selenium donors provide selenium, which is bioactivated to act as antioxidant. Thus, cellular selenium content, in general, did not correlate with cytoprotective activity of this trace element. However, cellular GPx activities at different times, with different concentrations, and with different Se donors always correlated with protection from lipid hydroperoxides and may, thus, represent a more reliable parameter to define adequate Se supply.

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570 Biowissenschaften, Biologie
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ISO 690LEIST, Marcel, Stefanie MAURER, Manfred SCHULTZ, Angelika ELSNER, Dieter GAWLIK, Regina BRIGELIUS-FLOHÉ, 1999. Cytoprotection against lipid hydroperoxides correlates with increased glutathione peroxidase activities, but not selenium uptake from different selenocompounds. In: Biological Trace Element Research. Springer. 1999, 68(2), pp. 159-174. ISSN 0163-4984. eISSN 1559-0720. Available under: doi: 10.1007/BF02784404
BibTex
@article{Leist1999-05Cytop-51270,
  year={1999},
  doi={10.1007/BF02784404},
  title={Cytoprotection against lipid hydroperoxides correlates with increased glutathione peroxidase activities, but not selenium uptake from different selenocompounds},
  number={2},
  volume={68},
  issn={0163-4984},
  journal={Biological Trace Element Research},
  pages={159--174},
  author={Leist, Marcel and Maurer, Stefanie and Schultz, Manfred and Elsner, Angelika and Gawlik, Dieter and Brigelius-Flohé, Regina}
}
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