Abstract
Spinocerebellar ataxia type 2 (SCA2) is an inherited and still incurable neurodegenerative disorder. Evidence suggests that pro-oxidant agents as well as factors involved in antioxidant cellular defenses are part of SCA2 physiopathology. To assess the influence of superoxide dismutase (SOD3) and catalase (CAT) enzymatic activities on the SCA2 syndrome. Clinical, molecular, and electrophysiological variables, as well as SOD3 and CAT enzymatic activities were evaluated in 97 SCA2 patients and in 64 age- and sex-matched control individuals. Spinocerebellar ataxia type 2 patients had significantly lower SOD3 enzymatic activity than the control group. However, there were no differences between patients and controls for CAT enzymatic activity. The effect size for the loss of patients' SOD3 enzymatic activity was 0.342, corresponding to a moderate effect. SOD3 and CAT enzymatic activities were not associated with the CAG repeat number at the ATXN2 gene. SOD3 and CAT enzymatic activities did not show significant associations with the age at onset, severity score, or the studied electrophysiological markers. There is a reduced SOD3 enzymatic activity in SCA2 patients with no repercussion on the clinical phenotype.
Highlights
Spinocerebellar ataxia type 2 (SCA2) is an inherited neurodegenerative disorder reaching the highest worldwide prevalence rate in Holguín province, Cuba [1]
The study protocol was approved by the Research Ethics Committee at the Center for Research and Rehabilitation of Hereditary Ataxias, and a written informed consent was obtained from the affected and control individuals included in the study
SOD3 enzymatic activity varied between 1.16 and 4.78 KU/L, while CAT enzymatic activity was in the range of 3.52–67.61 KUI/L
Summary
Spinocerebellar ataxia type 2 (SCA2) is an inherited neurodegenerative disorder reaching the highest worldwide prevalence rate in Holguín province, Cuba [1]. This is a ubiquitously expressed polyglutamine protein, which has been associated with RNA processing, translational regulation, endocytosis, and cell signaling [2, 3]. It has been suggested that oxidative stress might have an important role on the Antioxidant Enzymes and SCA2 pathological processes [4, 5]. In an inducible cell model for spinocerebellar ataxia type 7, the expression of mutated ATXN7 gene produced a concomitant increase in ROS levels, aggregation of the disease protein, and cellular toxicity [7]. Spinocerebellar ataxia type 2 (SCA2) is an inherited and still incurable neurodegenerative disorder. Evidence suggests that pro-oxidant agents as well as factors involved in antioxidant cellular defenses are part of SCA2 physiopathology.
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