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• W2149685712 abstract "Parkinson's disease is characterized by a selective loss of dopaminergic neurons in the nigrostriatal pathway. However, not all dopaminergic neurons degenerate in this disease, and calcium has been suspected of playing a role in this differential vulnerability. An overexpression of the calcium-dependent protease calpain II has recently been reported in the parkinsonian substantia nigra, suggesting that a rise in intracellular calcium concentrations may be involved in the mechanism leading to cell death. The proteasic activity of calpain is regulated by an endogenous inhibitory protein called calpastatin. Because little is known about the distribution of calpastatin in the primate brain, we first analyzed immunohistochemically the calpastatin expression in normal human and monkey brain. A ubiquitous distribution of calpastatin immunostaining was observed in both cases, but its expression was variable from one region to another. In the basal ganglia, staining was intense in the striatum, in the pallidal complex, and in some nuclei of the thalamus. The cerebellum was stained intensely, particularly in the granular and Purkinje cell layers. A dense, heterogeneous staining was observed in the hippocampal formation, mostly in the pyramidal and granular layers. The distribution of staining was similar in the different cerebral cortices studied, and it was most intense in layer V. In the brainstem, staining was particularly prominent in the substantia nigra pars reticulata and compacta, the central gray substance, the superior colliculus, and the cuneiform nucleus, and staining was moderate in the tegmenti pedonculopontinus nucleus and the griseum pontis. In the second part of the study, the authors compared calpastatin expression in the mesencephalon between patients with Parkinson's disease and control subjects. Sequential double staining revealed that some dopaminergic neurons coexpress calpastatin, the proportion of double-stained neurons ranging between 52% and 76% among the different dopaminergic cell groups. Quantitative analysis of the number of calpastatin-stained neurons evidenced a loss of both calpastatin-positive and calpastatin-negative neurons in the substantia nigra of patients with Parkinson's disease. These data suggest that calpain II overexpression in Parkinson's disease is not compensated for by a concomitant increase in calpastatin expression." @default.
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• W2149685712 date "2000-04-03" @default.
• W2149685712 modified "2023-09-23" @default.
• W2149685712 title "Calpastatin immunoreactivity in the monkey and human brain of control subjects and patients with Parkinson's disease" @default.
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• W2149685712 doi "https://doi.org/10.1002/(sici)1096-9861(20000403)419:2<175::aid-cne3>3.0.co;2-2" @default.
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