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Uptake of selenite, selenomethionine and selenate by brush border membrane vesicles isolated from rat small intestine

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Abstract

The uptake of selenite, selenate and selenomethionine (SeMet) was performed with brush border membrane vesicles (BBMV) prepared from rats fed selenium-deficient and supplemented diets. At equilibrium (60 min), the uptake of 75Se from [75Se]selenite ranged from 16.5 to 18.9 nmol mg-1 protein. There was a curvilinear relationship in the uptake of selenite over a concentration range of 10–1000 μ m. About 2 nmol mg-1 protein was obtained with selenomethionine (SeMet) which occurred between 90 and 180 s. In contrast to selenite, there was a linear relationship in the initial uptake of SeMet over a concentration range of 10–1000 μ m. The uptake of selenate was approximately 50-fold lower than selenite, reaching 350 pmol mg-1 protein. Dietary selenium level had no effect on the rate of 75Se accumulation by BBMV. Dramatic differences are found in the uptake and binding of selenium by BBMV incubated with different selenocompounds.

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Authors and Affiliations

  1. Department of Agricultural Chemistry, Oregon State University, Corvallis, OR, USA

    S. C. Vendeland, J. T. Deagen, J. A. Butler & P. D. Whanger

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  1. S. C. Vendeland
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  2. J. T. Deagen
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  3. J. A. Butler
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  4. P. D. Whanger
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Vendeland, S.C., Deagen, J.T., Butler, J.A. et al. Uptake of selenite, selenomethionine and selenate by brush border membrane vesicles isolated from rat small intestine. Biometals 7, 305–312 (1994). https://doi.org/10.1007/BF00144126

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  • DOI: https://doi.org/10.1007/BF00144126

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