Superoxide dismutase in amyotrophic lateral sclerosis patients homozygous for the D90A mutation.
The most common of the amyotrophic lateral sclerosis (ALS)-associated superoxide dismutase-1 (SOD1) mutations, D90A, differs from others in its high structural stability and by the existence of both recessive and dominant inheritance. Here SOD1 in CNS and peripheral organs from five ALS patients homozygous for D90A were compared to controls. In most areas, including ventral horns, there were no significant differences in SOD1 activities and Western blotting patterns between controls and D90A cases. The SOD1 activities in areas vulnerable to mutant SOD1s, ventral horns and precentral gyrus were intermediate among CNS areas and much lower than in kidney and liver. Thus, the vulnerability of motor areas is not explained by high SOD1 content. The findings argue against the idea of expression-reducing protective factors being present near the D90A locus in recessive pedigrees. The similarity to wild-type SOD1 prompts speculations on the involvement of the latter in sporadic ALS.
Jonsson
P Andreas
PA
Department of Medical Biosciences, Clinical Chemistry, Umeå University, SE-90185 Umeå, Sweden.
Graffmo
Karin S
KS
Andersen
Peter M
PM
Marklund
Stefan L
SL
Brännström
Thomas
T
D000328:Adult; D000368:Aged; D000690:Amyotrophic Lateral Sclerosis / Q000235:genetics* / Q000378:metabolism*; D015153:Blotting, Western; D001921:Brain / Q000378:metabolism; D006801:Humans; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000378:metabolism; D020125:Mutation, Missense; D009206:Myocardium / Q000378:metabolism; D013116:Spinal Cord / Q000378:metabolism; D013482:Superoxide Dismutase / Q000235:genetics* / Q000378:metabolism*; D000072105:Superoxide Dismutase-1
C000606290:SOD1 protein, human; D013482:Superoxide Dismutase; D000072105:Superoxide Dismutase-1