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Effect of zinc on L-threonine transport across the jejunum of rabbit

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Abstract

Zinc is an essential trace element for life. Many metalloenzymes involved in the metabolism of carbohydrates, lipids, protein, and nucleic acids require zinc for their functions. The aim of this study was to characterize how zinc acts on the intestinal amino acid absorption in rabbit. Results obtained show that zinc inhibits both L-threonine accumulation in the jejunum tissue, and mucosal-to-serosal transepithelial flux of this amino acid in a dose-dependent way. The inhibition does not increase by a 10-min previous intestinal exposure of the mucosa to the heavy metal, and is not reversed by washing the intestinal tissue with saline solution or 10mM EDTA, but is appreciably reversed with 10mM dithioerythritol. Zinc seems not to modify amino acid diffusion across the intestinal epithelium. The inhibition of intestinal amino acid transport by zinc seems to be of a competitive type, and appears to be a result of impairment of the active transport that is altered by its binding to proteins (prevailing to thiol groups) of the brush-border membrane of enterocytes.

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Authors and Affiliations

  1. Fisiología, Facultad de Veterinaria, Universidad de Zaragoza, Spain

    María-Carmen Rodriguez Yoldi, José-Emilio Mesonero & María-Jesús Rodriguez Yoldi

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  1. María-Carmen Rodriguez Yoldi
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  2. José-Emilio Mesonero
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  3. María-Jesús Rodriguez Yoldi
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Yoldi, MC.R., Mesonero, JE. & Yoldi, MJ.R. Effect of zinc on L-threonine transport across the jejunum of rabbit. Biol Trace Elem Res 37, 269–279 (1993). https://doi.org/10.1007/BF02783801

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  • DOI: https://doi.org/10.1007/BF02783801

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