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Nigrostriatal projecting neurons express GDNF receptor subunit RET in adult rats

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He S.-M., Zhao Z.-W., Zhao L., Wang X.-L., Jia D., Hou F., Gao G.-D.
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issue 3
347-353
EN
Nigrostriatal neurons expressing RET protein, a receptor protein tyrosine kinase of glial cell line-derived neurotrophic factor (GDNF), were investigated in rats using retrograde neural tracing with horseradish peroxidase (HRP) combined with immunohistochemistry. HRP/RET double-labeled neurons were abundantly distributed in the substantia nigra pars compacta ipsilateral to the caudate-putamen stereotaxically injected with HRP. Almost all the HRP-labeled neurons in nigra exhibited RET-like immunoreactivity, which however constituted more than half of the RET-immunoreactive cells. Our results present morphological evidence that GDNF-RET interaction plays important roles in physiological processes of nigrostriatal neuronal circuits of mammals.
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Controversies about iron in parkinsonian and control substantia nigra

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Galazka-Friedman J., Friedman A.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 3
217-225
EN
According to the oxidative stress theory iron may play an important role in the pathogenesis of neurodegenerative diseases, as e.g. Parkinson's disease (PD). This review presents the results of studies, obtained by various methods, of iron in substantia nigra (SN) - a cerebral structure which degenerates in PD - and shows controversies concerning the amount of iron, its redox state, and the iron binding compounds. Taking into account all published experimental results, the increase in the concentration of iron in parkinsonian SN vs. control may be estimated as (3 + - 5)%. The presence of large amounts of divalent iron in post mortem SN can be unequivocally negated. It is, however, still possible that iron is involved in the pathogenesis of PD, as even minor changes in the amount and form of iron may initiate processes leading to cells death.
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