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Dinamarca MC, Sagal JP, Quintanilla RA, et al. Amyloid-beta-Acetylcholinesterase complexes potentiate neurodegenerative changes induced by the Abeta peptide. Implications for the pathogenesis of Alzheimer's disease. Mol Neurodegener. 2010;5:4doi: 10.1186/1750-1326-5-4.
Dinamarca, M. C., Sagal, J. P., Quintanilla, R. A., Godoy, J. A., Arrázola, M. S., & Inestrosa, N. C. (2010). Amyloid-beta-Acetylcholinesterase complexes potentiate neurodegenerative changes induced by the Abeta peptide. Implications for the pathogenesis of Alzheimer's disease. Molecular neurodegeneration, 54. https://doi.org/10.1186/1750-1326-5-4
Dinamarca, Margarita C, et al. "Amyloid-beta-Acetylcholinesterase complexes potentiate neurodegenerative changes induced by the Abeta peptide. Implications for the pathogenesis of Alzheimer's disease." Molecular neurodegeneration vol. 5 (2010): 4. doi: https://doi.org/10.1186/1750-1326-5-4
Dinamarca MC, Sagal JP, Quintanilla RA, Godoy JA, Arrázola MS, Inestrosa NC. Amyloid-beta-Acetylcholinesterase complexes potentiate neurodegenerative changes induced by the Abeta peptide. Implications for the pathogenesis of Alzheimer's disease. Mol Neurodegener. 2010 Jan 18;5:4. doi: 10.1186/1750-1326-5-4. PMID: 20205793; PMCID: PMC2823746.
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Mol Neurodegener. 2010 Jan 18;5:4. doi: 10.1186/1750-1326-5-4.

Amyloid-beta-Acetylcholinesterase complexes potentiate neurodegenerative changes induced by the Abeta peptide. Implications for the pathogenesis of Alzheimer's disease.

Molecular neurodegeneration

Margarita C Dinamarca, Juan P Sagal, Rodrigo A Quintanilla, Juan A Godoy, Macarena S Arrázola, Nibaldo C Inestrosa

Affiliations

  1. Centro de Regulación Celular y Patología "Joaquín V, Luco" (CRCP), Instituto Milenio MIFAB, Centro de Envejecimiento y Regeneración (CARE), Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, 8331010 Santiago, Chile. [email protected].

PMID: 20205793 PMCID: PMC2823746 DOI: 10.1186/1750-1326-5-4

Abstract

The presence of amyloid-beta (Abeta) deposits in selected brain regions is a hallmark of Alzheimer's disease (AD). The amyloid deposits have "chaperone molecules" which play critical roles in amyloid formation and toxicity. We report here that treatment of rat hippocampal neurons with Abeta-acetylcholinesterase (Abeta-AChE) complexes induced neurite network dystrophia and apoptosis. Moreover, the Abeta-AChE complexes induced a sustained increase in intracellular Ca2+ as well as a loss of mitochondrial membrane potential. The Abeta-AChE oligomers complex also induced higher alteration of Ca2+ homeostasis compared with Abeta-AChE fibrillar complexes. These alterations in calcium homeostasis were reversed when the neurons were treated previously with lithium, a GSK-3beta inhibitor; Wnt-7a ligand, an activator for Wnt Pathway; and an N-methyl-D-aspartate (NMDA) receptor antagonist (MK-801), demonstrating protective roles for activation of the Wnt signaling pathway as well as for NMDA-receptor inhibition. Our results indicate that the Abeta-AChE complexes enhance Abeta-dependent deregulation of intracellular Ca2+ as well as mitochondrial dysfunction in hippocampal neurons, triggering an enhanced damage than Abeta alone. From a therapeutic point of view, activation of the Wnt signaling pathway, as well as NMDAR inhibition may be important factors to protect neurons under Abeta-AChE attack.

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