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Selenoproteome Expression Studied by Non-Radioactive Isotopic Selenium-Labeling in Human Cell Lines
Jordan Sonet1, Anne-Laure Bulteau2, Zahia Touat-Hamici3
1Institut des Sciences Analytiques et de Physico-Chimie Pour l'Environnement et les Matériaux (IPREM), Universite de Pau, CNRS, E2S, UMR 5254, Hélioparc, 64053 Pau, France.
International Journal of Molecular Sciences
|July 24, 2021
Summary
This study introduces a new method using non-radioactive selenium isotopes to study selenoprotein regulation. This approach helps understand how selenium levels impact cell functions and antioxidant defense.
Area of Science:
- Biochemistry
- Cell Biology
- Nutritional Science
Background:
- Selenoproteins, containing the amino acid selenocysteine, are crucial for mammalian cell homeostasis, antioxidant defense, and signaling.
- Selenoproteome expression, comprising 25 genes, is highly dependent on dietary selenium availability and body selenium status.
Purpose of the Study:
- To develop and validate an alternative strategy for characterizing selenoproteome regulation.
- To investigate the hierarchy of selenoproteome regulation under varying selenium conditions.
Main Methods:
- Selective labeling of cellular selenocompounds with non-radioactive selenium isotopes (76Se, 77Se).
- Detection of isotopic enrichment in selenoproteins via size-exclusion chromatography coupled with inductively coupled plasma mass spectrometry (SEC-ICP-MS).
- Validation using western blots with selenoprotein-specific antibodies.
Main Results:
- Successfully characterized the hierarchy of selenoproteome regulation.
- Demonstrated the reliability of the novel isotopic labeling and detection strategy.
- Provided insights into dose-response and kinetic aspects of selenoprotein regulation.
Conclusions:
- The developed method offers a robust alternative for studying selenoprotein regulation without direct use of radioactive isotopes.
- This technique enhances our understanding of how selenium status influences cellular functions and the selenoproteome.
- The findings contribute to the field of selenium metabolism and its impact on cellular health.
