The effect of zinc and magnesium on calcium uptake into the rat duodenum slices |
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Authors: | Danuta Witkowska Łukasz Sedrowicz Regina Oledzka Aleksandra Białek |
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Affiliation: | (1) Department of Bromatology, Institute of Biopharmacy, Medical Academy of Warsaw, PL-02-097 Warsaw, Poland |
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Abstract: | Summary The experiments were carried out on 80 male Wistar rats, divided into four groups as follows: group 1, treated orally with ZnCl2 at a dose of 10 mg Zn2+/kg for 14 days; group 2, control; group 3, MgCl2-treated at a dose of 5 mg Mg2+/kg; group 4, treated with ZnCl2 plus MgCl2 in the same manner as groups 1 and 3. The influx of calcium into the rat duodenum slices was investigated in vitro by the method of Papworth and Patrick. Over a range of calcium concentrations (0–10 mM) the influx of this element was defined as a sum of a saturable term (active transport) and a linear term dependent on concentration (passive transport). In the zinc-treated rats only the saturable term was affected. The study of this term by Lineweaver-Burk plots showed a decrease of the half-saturation constant,Kt, while the maximal value,Jm, remained unchanged. Moreover, magnesium was shown to interact with zinc at gut level because simultaneous oral administration of Mg2+ and Zn2+ to rats protected them against the inhibition of calcium uptake observed when Zn2+ was given alone. |
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Keywords: | Metal Metal interaction Calcium uptake Zinc Magnesium |
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