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Metal composition of human hepatic and renal metallothionein

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Abstract

This article is based on data on the levels of metals (Cd, Zn, Cu) and metallothionein (MT) determined radiochemically with203Hg in renal cortex and liver of 137 autopsy cases. From this number, for 23 cases, the gel filtration of the cytoplasmic fraction of the organs was performed.

The molar content of metals in the MT fraction (Sephadex G-50) amounted to 46.9, 50.2, and 2.0% for Cd, Zn, and Cu in renal cortex, respectively, and to 8.3, 83.6, and 9.1% for Cd, Zn, and Cu in the liver, respectively. In parallel with the increase of Cd and MT in renal cortex, increasing saturation was found of the MT fraction by Cd, occurring at the expense of Zn and Cu. Equimolar amounts of Cd and Zn in the MT fraction are found at Cd level of 0.5 μmol Cd/g wet wt of renal cortex. In the liver, analogous dependency (elevation of %Zn, depression of %Cd and %Cu) were observed in relation to Zn and MT levels in this organ.

The basic level of Zn (not bound with MT) was estimated at 0.5 μmol/g for both renal cortex and liver. A deficit of non-MT Zn in kidneys is proposed as an alternative mechanism of toxic Cd action.

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  1. Department of Toxicological Chemistry, Medical University of Lodz, 90-151 Łódź, Muszyńskiego 1, Poland

    Czesław Orłowski & Jerzy K. Piotrowski

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  1. Czesław Orłowski
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  2. Jerzy K. Piotrowski
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Orłowski, C., Piotrowski, J.K. Metal composition of human hepatic and renal metallothionein. Biol Trace Elem Res 65, 133–141 (1998). https://doi.org/10.1007/BF02784265

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  • DOI: https://doi.org/10.1007/BF02784265

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