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• W2039239210 abstract "Brain performances, e.g. learning and memory, decay during aging. Deterioration of synaptic junctions, as structural correlates of these key functions of the central nervous system, may play a central role in this impairment. Current research on the age-related changes of synapses is documenting that the numeric loss of contacts appears to trigger a compensatory reaction by the old CNS, i.e. the surviving junctional areas in old individuals are larger than in adult subjects. The final outcome of the balanced changes in synaptic number and size is that the overall synaptic junctional area per cubic micron of neuropil is also reduced in aging and this may account for the age-associated functional decay of CNS performances. Among the suggested determinants of synaptic deterioration in aging, a considerable number of recent studies support an early and pivotal role of the progressive decline of the mitochondrial metabolic competence, i.e. the capacity of select pools of organelles to provide adequate amounts of adenosine triphosphate. Quantitative ultrastructural studies together with cytochemistry of key enzymes of the respiratory chain (cytochrome oxidase and succinic dehydrogenase) have shown that mitochondrial dysfunctions play an early and central role in synaptic deterioration events associated with aging and neurodegenerative diseases. Among the various causes, the multiple mechanisms and molecules involved in zinc ion homeostasis have been supposed to be less efficient in the aging brain. Thus, a transient imbalance of free zinc ion concentration in the cytosol ([Zn2+]i) can be considered an unfavourable trigger of subtle mitochondrial damage and synaptic pathology." @default.
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• W2039239210 date "2006-06-01" @default.
• W2039239210 modified "2023-10-18" @default.
• W2039239210 title "Synaptic and mitochondrial physiopathologic changes in the aging nervous system and the role of zinc ion homeostasis" @default.
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• W2039239210 doi "https://doi.org/10.1016/j.mad.2006.01.019" @default.
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