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• W2094507987 abstract "Oxidant stress has been implicated in the pathogenesis of Parkinson's disease. To test the oxidant stress hypothesis of dopaminergic degeneration, age-related changes in the mesostriatal dopamine neuron system were compared between zitter mutant rats which have abnormal metabolism of oxygen species in the brain and Sprague-Dawley rat as a control using the neurochemistry and immunohistochemistry. Dopamine content in the caudate-putamen, nucleus accumbens and olfactory tubercle of zitter rats decreased significantly with age, and was lower than that found in corresponding age-matched controls. In the zitter rats, the reduction of dopamine was more prominent in the caudate-putamen than in the nucleus accumbens and olfactory tubercle. A characteristic decline of tyrosine hydroxylase-immunoreactive fibers in the caudate-putamen of the zitter rat was also observed. In the dorsolateral caudate-putamen, reduction of tyrosine hydroxylase-immunoreactive fibers was observed in the matrix-like area, whereas in the ventromedial caudate-putamen the reduction occurred in the patch-like areas. Degeneration of tyrosine hydroxylase-immunoreactive fibers which was characterized by swollen varicosities and clustered fibers was observed in the caudate-putamen and nucleus accumbens and preceded loss of normal tyrosine hydroxylase-immunoreactive fibers in the caudate-putamen. Thus, the depletion of dopamine in the terminal areas is related to axonal degeneration. However, there was no degenerative tyrosine hydroxylase-immunoreactive fibers in the olfactory tubercle at any examined age, but reductions of tyrosine hydroxylase-immunoreactive fibers and dopamine contents were noted in the olfactory tubercle after four months-of-age. Since the zitter rats have an abnormal oxygen metabolism, the degeneration of tyrosine hydroxylase-immunoreactive fibers could result from an accumulation of superoxide species. The present results provide support for the oxidant stress hypothesis of dopaminergic neuronal degeneration and further indicate the region-specific vulnerability of the nigrostriatal dopamine system." @default.
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• W2094507987 date "1999-12-01" @default.
• W2094507987 modified "2023-10-16" @default.
• W2094507987 title "Age-related dopamine deficiency in the mesostriatal dopamine system of zitter mutant rats: regional fiber vulnerability in the striatum and the olfactory tubercle" @default.
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• W2094507987 doi "https://doi.org/10.1016/s0306-4522(99)00451-0" @default.
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