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Arrowheads indicate CHGB accumulation and SOD1 in cultured cells.
Neuro2A cells were co-transfected with FLAG-tagged SOD1 and HA-tagged CHGB.
Most ALS patients die within 2 to 5 years after onset of symptoms since no effective treatment exists. The most frequent genetic causes of familial ALS are mutations in the gene coding for superoxide dismutase 1 (SOD1) (1,2) and an expansion of hexanucleotide repeats in noncoding region of are also known to be associated with ALS (5–26).
Since previous studies demonstrated a role for CHGB in supporting neurite outgrowth of cultured cells (34–36), we examined the effects of CHGB transgenic mouse lines that overexpressed human CHGB m RNA species at similar levels in the spinal cord as assessed by quantitative real time RT-PCR.
These transgenic mice also exhibited similar excess CHGB protein levels in the microsomal fraction of the spinal cord when examined at 210 days of age ( showed no deficiency on the rotarod test or on body weight loss until 500 days of age (data not shown).
As expected, CHGB was co-immunoprecipitated with mutant SOD1 in fractions from SOD13-4) was analyzed. Post-ANOVA Turkey test was used in each sex (same for all figures).
(D) Enhanced Bip expression due to misf SOD1 accumulation (C4F6 antibody) in motor neurons of SOD1 female mice at 300 days of age. Post-ANOVA Turkey test was used in each sex (same for all figures).