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. 1992 Oct 15;89(20):9549–9553. doi: 10.1073/pnas.89.20.9549

Decreased choline acetyltransferase mRNA expression in the nucleus basalis of Meynert in Alzheimer disease: an in situ hybridization study.

O Strada 1, S Vyas 1, E C Hirsch 1, M Ruberg 1, A Brice 1, Y Agid 1, F Javoy-Agid 1
PMCID: PMC50169  PMID: 1409664

Abstract

The subnormal choline acetyltransferase (ChoAcTase) activity in the cerebral cortex of patients with Alzheimer disease (AD) is thought to originate from the loss of cholinergic neurons in the nucleus basalis of Meynert (nbM). To examine possible changes in the functional activity of the remaining cholinergic neurons in the nbM of patients with AD, the level of expression of ChoAcTase mRNA was evaluated. A procedure for double-labeling cholinergic neurons to detect ChoAcTase mRNA and the corresponding protein in the same cell was developed, taking advantage of an anti-ChoAcTase antibody and the recently isolated cDNA complementary to a sequence of the human ChoAcTase mRNA. In the study of three controls and four patients with AD, the presence of both ChoAcTase mRNA and protein was observed in the same large neurons in both nbM and putamen. Specificity of in situ hybridization was further supported by the absence of neuronal staining with a sense probe. In AD patients a subnormal level of expression of ChoAcTase mRNA per cholinergic cell was detected in the nbM but not in the putamen. Our data support the hypothesis that expression of ChoAcTase mRNA might be down-regulated in the surviving cholinergic neurons in the nbM of patients with AD, raising the possibility of functional restoration by stimulating ChoAcTase synthesis.

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Selected References

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