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Oral Treatment with Cu[superscript II](atsm) Increases Mutant SOD1 In Vivo but Protects Motor Neurons and Improves the Phenotype of a Transgenic Mouse Model of Amyotrophic Lateral Sclerosis

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  • Mutations in the metallo-protein Cu/Zn-superoxide dismutase (SOD1) cause amyotrophic lateral sclerosis (ALS) in humans and an expression level-dependent phenotype in transgenic rodents. We show that oral treatment with the therapeutic agent diacetyl-bis(4-methylthiosemicarbazonato)copper[superscript II] [Cu[superscript II](atsm)] increased the concentration of mutant SOD1 (SOD1G37R) in ALS model mice, but paradoxically improved locomotor function and survival of the mice. To determine why the mice with increased levels of mutant SOD1 had an improved phenotype, we analyzed tissues by mass spectrometry. These analyses revealed most SOD1 in the spinal cord tissue of the SOD1G37R mice was Cu deficient. Treating with Cu[superscript II](atsm) decreased the pool of Cu-deficient SOD1 and increased the pool of fully metallated (holo) SOD1. Tracking isotopically enriched ⁶⁵Cu[superscript II](atsm) confirmed the increase in holo-SOD1 involved transfer of Cu from Cu[superscript II](atsm) to SOD1, suggesting the improved locomotor function and survival of the Cu[superscript II](atsm)-treated SOD1G37R mice involved, at least in part, the ability of the compound to improve the Cu content of the mutant SOD1. This was supported by improved survival of SOD1G37R mice that expressed the human gene for the Cu uptake protein CTR1. Improving the metal content of mutant SOD1 in vivo with Cu[superscript II](atsm) did not decrease levels of misfolded SOD1. These outcomes indicate the metal content of SOD1 may be a greater determinant of the toxicity of the protein in mutant SOD1-associated forms of ALS than the mutations themselves. Improving the metal content of SOD1 therefore represents a valid therapeutic strategy for treating ALS caused by SOD1.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by the Society for Neuroscience. The published article can be found at: http://www.jneurosci.org/.
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  • Roberts, B. R., Lim, N. K. H., McAllum, E. J., Donnelly, P. S., Hare, D. J., Doble, P. A., ... & Crouch, P. J. (2014). Oral Treatment with Cu[superscript II](atsm) Increases Mutant SOD1 In Vivo but Protects Motor Neurons and Improves the Phenotype of a Transgenic Mouse Model of Amyotrophic Lateral Sclerosis. Journal of Neuroscience, 34(23), 8021-8031. doi:10.1523/JNEUROSCI.4196-13.2014
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  • 34
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  • 23
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  • This work was supported by funds from the Australian National Health and Medical Research Council (Project Grants 1005651 and 1061550); the Motor Neuron Disease Research Institute of Australia; the Victorian Government's Operational Infrastructure Support Program; Bethlehem Griffiths Research Foundation; the CASS Foundation; the Australian Research Council; the National Academy of Finland; the Sigrid Juselius Foundation; and The University of Melbourne.
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