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Treatment with a catalytic antioxidant corrects the neurobehavioral defect in ataxia-telangiectasia mice
Susan E Browne1, L Jackson Roberts, Phyllis A Dennery
1Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY, USA.
Abstract:
Ataxia-telangiectasia is caused by mutations in the ATM gene, the protein product of which is essential for effective response to double-stranded DNA breaks. Loss of ATM function explains most aspects of the disease, but not the cerebellar neurodegeneration characteristic of the disease. Mice lacking ATM provide an excellent model of the human disorder. In addition to deficient response to DNA damage, these mice exhibit oxidative stress, which we hypothesized is the cause of cerebellar dysfunction. We show that treatment with a catalytic antioxidant corrects the neurobehavioral deficit in these mice.
Insights
Ataxia-telangiectasia (A-T) is linked to ATM gene mutations. Researchers found that oxidative stress causes cerebellar dysfunction in A-T mice, and catalytic antioxidants corrected this neurobehavioral deficit.
Area of Science:
- Genetics and Molecular Biology
- Neuroscience
- Biochemistry
Background:
- Ataxia-telangiectasia (A-T) results from mutations in the ATM gene, crucial for DNA double-strand break repair.
- While ATM deficiency explains many A-T symptoms, the characteristic cerebellar neurodegeneration remains unexplained.
- ATM-deficient mice serve as a valuable model for studying human A-T.
Purpose of the Study:
- To investigate the cause of cerebellar neurodegeneration in ATM-deficient mice.
- To determine if oxidative stress contributes to cerebellar dysfunction in this A-T model.
- To evaluate the therapeutic potential of antioxidants for A-T-related neurological deficits.
Main Methods:
- Utilized ATM-deficient mice as a model organism.
- Assessed DNA damage response and oxidative stress markers in the cerebellum.
- Administered a catalytic antioxidant treatment to the mice.
- Evaluated neurobehavioral outcomes following treatment.
Main Results:
- ATM-deficient mice exhibited significant oxidative stress.
- The observed oxidative stress correlated with cerebellar dysfunction.
- Catalytic antioxidant treatment successfully ameliorated the neurobehavioral deficits in these mice.
Conclusions:
- Oxidative stress is a key factor driving cerebellar neurodegeneration in Ataxia-telangiectasia.
- Targeting oxidative stress with catalytic antioxidants offers a promising therapeutic strategy for A-T.
- This study highlights the potential of antioxidant therapies for neurological complications in A-T.
