SOD1opathy in sporadic amyotrophic lateral sclerosis with high plasma misfolded SOD1 protein level and specific electrophysiological pattern
The clinical manifestations of sporadic amyotrophic lateral sclerosis (ALS) are highly variable, implying existence of subgroups in pathophysiology. We studied a group of patients with sporadic ALS and an ALS mouse model having superoxide dismutase 1 (SOD1)/G93A transgenes using chemical precipitation followed by enzyme-linked immunosorbent assay analysis for measurement of plasma misfolded protein levels and by a nerve excitability test (NET) to investigate axonal membrane properties. Six of 19 patients (31.6%) with sporadic ALS had elevated plasma misfolded SOD1 protein levels. In sporadic A