• Leah Winer, Dushyanth Srinivasan, Seung Chun, David Lacomis, Matthew Jaffa, Anne Fagan, David M Holtzman, Ed Wancewicz, C Frank Bennett, Robert Bowser, Merit Cudkowicz, and Timothy M Miller.
• Department of Neurology, Washington University, St Louis, Missouri 63110, USA.
• JAMA Neurol. 2013 Feb 1; 70 (2): 201-7.

BackgroundTherapies designed to decrease the level of SOD1 are currently in a clinical trial for patients with superoxide dismutase (SOD1)-linked familial amyotrophic lateral sclerosis (ALS).ObjectiveTo determine whether the SOD1 protein in cerebral spinal fluid (CSF) may be a pharmacodynamic marker for antisense oligonucleotide therapy and a disease marker for ALS.DesignAntisense oligonucleotides targeting human SOD1 were administered to rats expressing SOD1G93A. The human SOD1 protein levels were measured in the rats' brain and CSF samples. In human CSF samples, the following proteins were measured: SOD1, tau, phosphorylated tau, VILIP-1, and YKL-40.ParticipantsNinety-three participants with ALS, 88 healthy controls, and 89 controls with a neurological disease (55 with dementia of the Alzheimer type, 19 with multiple sclerosis, and 15 with peripheral neuropathy).ResultsAntisense oligonucleotide-treated SOD1G93A rats had decreased human SOD1 messenger RNA levels (mean [SD] decrease of 69% [4%]) and decreased protein levels (mean [SD] decrease of 48% [14%]) in the brain. The rats' CSF samples showed a similar decrease in hSOD1 levels (mean [SD] decrease of 42% [14%]). In human CSF samples, the SOD1 levels varied a mean (SD) 7.1% (5.7%) after additional measurements, separated by months, were performed. The CSF SOD1 levels were higher in the participants with ALS (mean [SE] level, 172 [8] ng/mL; P<.05) and the controls with a neurological disease (mean [SE] level, 172 [6] ng/mL; P<.05) than in the healthy controls (mean [SE] level, 134 [4] ng/mL). Elevated CSF SOD1 levels did not correlate with disease characteristics in participants with ALS or controls with dementia of the Alzheimer type, but they did correlate with tau, phosphorylated tau, VILIP-1 and YKL-40 levels in controls with dementia of the Alzheimer type.ConclusionsSOD1 in CSF may be an excellent pharmacodynamic marker for SOD1-lowering therapies because antisense oligonucleotide therapy lowers protein levels in the rat brain and rat CSF samples and because SOD1 levels in CSF samples from humans are stable over time.

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