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Copper accumulation in the soluble and particulate fractions of renal cortex in the streptozotocin-diabetic rat

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Abstract

The accumulation and subcellular distribution of copper in the kidney of streptozotocin-diabetic rats were investigated. Male Sprague-Dawley rats received streptozotocin (50 mg/kg body wt on two consecutive days) intraperitoneally and were fed either commercial or purified diet. The concentrations of copper, zinc, iron, and manganese present in intact kidney, renal cortex, and renal medulla were compared at various times. Chow-fed diabetic rats had a renal copper concentration 2.6 times greater than age-matched controls after 2 weeks. The concentration of zinc was only 30% higher in diabetic kidney than in control tissue, whereas the iron and manganese concentrations were similar for both groups. The additional complement of renal copper was localized entirely in the cortex and was significantly reduced by oral treatment with penicillamine, a copper chelating agent. When diabetic rats were fed purified diet (15-20 ppm Cu), the quantity of copper accumulated in the renal cortex increased from 2.3 to 8.7-fold higher than in control tissue from 1 to 4 weeks, respectively, after injection with streptozotocin. Copper levels in. both the soluble and particulate (165, 000g pellet) fractions of diabetic renal cortex were similarly increased at each time. Gel filtration Chromatographic analysis of the cytosol showed that all of the copper accumulated in the soluble fraction was associated with metallothionein. The distribution of excess copper in the particulate fraction was determined by differential centrifugation. The additional quantity of metal was localized in the crude nuclear fraction of renal cortex in the diabetic rat. Further analysis revealed that the lysosomal fraction from 3-weeek diabetic rats had a copper level 16-fold higher than in the controls. The possibility that accumulation of excessive levels of copper in the streptozotocin-diabetic kidney may contribute to the development of diabetic nephropathy is discussed.

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Author notes

  1. Susan P. Osborne

    Present address: West Virginia School of Osteopathic Medicine, Lewisburg, WV

Authors and Affiliations

  1. Department of Biochemistry and Nutrition, Virginia Polytechnic Institute and State University, 24061, Blacksburg, Virginia

    Carol A. Gassman, Mark L. Failla, Susan P. Osborne & Anne R. Alexander

Authors
  1. Carol A. Gassman
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  2. Mark L. Failla
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  3. Susan P. Osborne
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  4. Anne R. Alexander
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Gassman, C.A., Failla, M.L., Osborne, S.P. et al. Copper accumulation in the soluble and particulate fractions of renal cortex in the streptozotocin-diabetic rat. Biol Trace Elem Res 5, 475–487 (1983). https://doi.org/10.1007/BF02988940

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  • DOI: https://doi.org/10.1007/BF02988940

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