Abstract
A common cause of amyotrophic lateral sclerosis is mutations in superoxide dismutase-1, which provoke the disease by an unknown mechanism. We have previously found that soluble hydrophobic misfolded mutant human superoxide dismutase-1 species are enriched in the vulnerable spinal cords of transgenic model mice. The levels were broadly inversely correlated with life spans, suggesting involvement in the pathogenesis. Here, we used methods based on antihuman superoxide dismutase-1 peptide antibodies specific for misfolded species to explore the composition and amounts of soluble misfolded human superoxide dismutase-1 in tissue extracts. Mice expressing 5 different human superoxide dismutase-1 variants with widely variable structural characteristics were examined. The levels were generally higher in spinal cords than in other tissues. The major portion of misfolded superoxide dismutase-1 was shown to be monomers lacking the C57–C146 disulfide bond with large hydrodynamic volume, indicating a severely disordered structure. The remainder of the misfolded protein appeared to be non-covalently associated in 130- and 250-kDa complexes. The malleable monomers should be prone to aggregate and associate with other cellular components, and should be easily translocated between compartments. They may be the primary cause of toxicity in superoxide dismutase-1-induced amyotrophic lateral sclerosis.
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Acknowledgments
We thank Eva Bern, Karin Hjertkvist, Ann-Charloth Nilsson, Ulla-Stina Spetz, and Agneta Öberg for excellent technical assistance. This work was supported by the Swedish Science Council, the Swedish Brain Fund/Hållsten Fund, the Swedish Medical Society including the Björklund Fund for ALS Research, the ALS Association, the Swedish Association of Persons with Neurological Disabilities, Västerbotten County Council, the Kempe Foundations, and the King Gustaf V and Queen Victoria Foundation.
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12017_2012_8204_MOESM1_ESM.eps
Supplementary material Fig. S1 Oxidation of hSOD1 without protection. Three pieces of brain from a G93A mouse were homogenized in PBS, PBS supplemented with 40 mM IAM, or PBS supplemeted with 0.5 mM DTT. After centrifugation, the extracts were passed over NAP5 columns (GE Healthcare) into the respective buffers. Eluted samples were incubated at 4ºC and 37ºC and samples taken after the times indicated. The disulfide status of SOD1 was investigated by non-reducing western immunoblots (EPS 15796 kb)
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Supplementary material Fig. S2 Superdex 200 SEC pattern. The spinal cord extract from the G93A mouse used for cross-linking experiments (see Fig. 7) was separated by SEC using a Superdex 200 column, and misfolded hSOD1 was analyzed with misELISA. The letters indicate the elution positions of molecular weight markers in the SEC: a, 2000 kDa; b, 669 kDa; c, 440 kDa; d, 158 kDa; e, 75 kDa; f, 69 kDa; g, 44 kDa; h, 32 kDa; i, 13.7 kDa (EPS 843 kb)
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Supplementary material Table 1 Comparison of EDTA or IAM in homogenization buffer. CNS homogenates containing EDTA or IAM from hSOD1 transgenic mice were analyzed for misfolded hSOD1 with misELISA (DOCX 14 kb)
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Zetterström, P., Graffmo, K.S., Andersen, P.M. et al. Composition of Soluble Misfolded Superoxide Dismutase-1 in Murine Models of Amyotrophic Lateral Sclerosis. Neuromol Med 15, 147–158 (2013). https://doi.org/10.1007/s12017-012-8204-z
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DOI: https://doi.org/10.1007/s12017-012-8204-z