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Differential distribution of presenilin-1, Bax, and Bcl-X(L) in Alzheimer's disease and frontotemporal dementia

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Published in Acta Neuropathologica. 1999, vol. 98, no. 2, p. 141-149
Abstract We have previously reported that presenilin-1 (PS-1)-immunoreactive neurons survive in late-onset sporadic Alzheimer's disease (AD). To examine if this is also the case in other dementing conditions, and if it is associated with changes in the expression of the main apoptosis-related proteins, a quantitative immunocytochemical study of presenilin-1, Bax, and Bcl-X(L) in the cerebral cortex of non-demented and AD patients, and patients with frontotemporal dementia (FTD) was performed. In non-demented cases, the frequency of neurons showing PS-1 immunoreactivity was 25-60%, Bax immunoreactivity 36-54%, and Bcl-X(L) immunoreactivity 26-63% depending on the cortical area. The frequency of NFT-free neurons which contained PS-1 or Bax was consistently increased in all of the areas in AD. In FTD cases, the percentage of PS-I-, but not Bax-immunoreactive neurons was increased only in areas displaying a substantial neuronal loss. Conversely, there was no difference in the densities of Bcl-X(L)-containing neurons among the three diagnosis groups. These data suggest that surviving neurons in affected cortical areas in AD show a high expression of PS-1 and Bax, indicating that these proteins play a key role in the mechanisms of cell death in this disorder. In FTD, neurons containing PS-1 are preserved, further supporting a neuroprotective role for this protein in other neurodegenerative disorders.
Keywords AgedAged, 80 and overAlzheimer Disease/metabolismDementia/metabolismFemaleFrontal Lobe/physiopathologyHumansImmunohistochemistryMaleMembrane Proteins/metabolismPresenilin-1Proto-Oncogene Proteins/metabolismProto-Oncogene Proteins c-bcl-2/metabolismReference ValuesTemporal Lobe/physiopathologyTissue Distribution/physiologyBcl-2-Associated X ProteinBcl-X Protein
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PMID: 10442553
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Research group Groupe Bouras Constantin (neuropsychiatrie) (1)
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GIANNAKOPOULOS, Panteleimon et al. Differential distribution of presenilin-1, Bax, and Bcl-X(L) in Alzheimer's disease and frontotemporal dementia. In: Acta Neuropathologica, 1999, vol. 98, n° 2, p. 141-149. https://archive-ouverte.unige.ch/unige:26607

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Deposited on : 2013-03-06

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