The purpose of this research is to investigate the absorption, distribution, excretion, and pharmacokinetics of selenite in rats after intragastric administration, and thus illustrate the efficiency of selenium (Se) supplementation. After a single gavage of sodium selenite, a concentration of Se in plasma and tissues was determined by inductively coupled plasma mass spectrometry (ICP-MS) at different time points. Through fitting the data with the metabolic kinetic model, the corresponding kinetic parameters were determined for plasma and tissues, including kidney, liver, heart, muscle, and gonad. While the metabolic kinetics of sodium selenite in plasma, liver, and kidney of rats was well reflected by a two-compartment open model, that in heart and gonad was fitted to a one-compartment open model, and that in muscle was fitted to a one-compartment open model with a lag time. The results indicate that sodium selenite was absorbed by plasma and tissues quickly and was eliminated slowly after intragastric administration. Based on the results, we propose that multi-supplementation of Se with low dosage is superior to single supplementation with high dosage, in terms of avoiding selenosis.
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We thank Prof. Guoping Yan (Wuhan Institute of Technology) for the helpful suggestion in the revision of the manuscript.
This work was financially supported by the Natural Science Foundation of Hubei Province (No. 2016CFB212), Major Project of Technical Innovation in Hubei Province (No. 2017ABA156), Hubei Provincial Health and Family Planning Commission (No. WJ2019Q054), and National Natural Science Foundation of China (No. 51703173).
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Zeng, X., Zhang, X., Fan, B. et al. Pharmacokinetics of Sodium Selenite in Rat Plasma and Tissues After Intragastric Administration. Biol Trace Elem Res 196, 494–501 (2020). https://doi.org/10.1007/s12011-019-01928-8
- Sodium selenite
- Metabolism dynamics
- Kinetic parameter