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- W1503541089 abstract "Ataxia-telangiectasia (A-T) is a genetic disease, associated with progressive motor impairment and a lack of functional ATM protein. It has been reported that immunoreactive tyrosine hydroxylase and dopamine transporter are reduced in an Atm-/- mouse model of A-T. These observations led to a hypothesis that A-T is associated with loss of nigrostriatal dopamine and prompted the launch of clinical trials to evaluate a therapeutic utility of the anti-parkinsonian drug, l-DOPA. To test for dopamine depletion more directly, we measured regional levels of monoamines and their metabolites in the Atm-/- mouse brain. We also measured levels of NAD+, a cofactor for dopamine biosynthesis and substrate of the DNA damage surveillance enzyme, poly(ADP-ribose) polymerase (PARP). Constitutive activation of PARP has been posited to cause NAD+ depletion. We observed no reduction in monoamine transmitters and no depletion of NAD+, or other high energy phosphate donors in the adult Atm-/- cerebellum, striatum, or ventral mesencephalon. However, our studies did reveal a progressive sensorimotor impairment in Atm-/- mice that may serve as a relevant proxy for progressive neurological impairment in the human disease. Our results call into question the involvement of dopamine in A-T and the therapeutic strategy of enhancing dopaminergic function with l-DOPA." @default.
- W1503541089 created "2016-06-24" @default.
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- W1503541089 date "2004-02-20" @default.
- W1503541089 modified "2023-10-16" @default.
- W1503541089 title "Progressive sensorimotor impairment is not associated with reduced dopamine and high energy phosphate donors in a model of ataxia-telangiectasia" @default.
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- W1503541089 doi "https://doi.org/10.1046/j.1471-4159.2003.02278.x" @default.
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