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Excited to death: different ways to lose your neurones

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Abstract

The selective loss of neurones in a range of neurodegenerative diseases is widely thought to involve the process of excitotoxicity, in which glutamate-mediated neuronal killing is elaborated through the excessive stimulation of cell-surface receptors. Every such disease exhibits a distinct regional and subregional pattern of neuronal loss, so processes must be locally triggered to different extents to account for this. We have studied several mechanisms which could lead to excitotoxic glutamate pathophysiology and compared them indifferent diseases. Our data suggest that glutamate can reach toxic extracellular levels in Alzheimer disease by malfunctions in cellular transporters, and that the toxicity may be exacerbated by continued glutamatere lease from presynaptic neurones acting on hypersensitive postsynaptic receptors. Thus the excitotoxicity is direct. In contrast, alcoholic brain damage arises in regions where GABA-mediated inhibition is deficient, and fails properly to dampen trans-synaptic excitation. Thus the excitotoxicity is indirect. A variety of such mechanisms is possible, which may combine in different ways.

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  1. Department of Biochemistry, University of Queensland, Brisbane, 4072, Australia

    Peter R. Dodd

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Dodd, P.R. Excited to death: different ways to lose your neurones. Biogerontology 3, 51–56 (2002). https://doi.org/10.1023/A:1015255312948

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