UMMS Affiliation

Program in Molecular Medicine

Date

11-23-2011

Document Type

Article

Medical Subject Headings

Amyloid beta-Protein Precursor; Animals; Animals, Newborn; Apoptosis; Cells, Cultured; Enzyme Activation; Humans; JNK Mitogen-Activated Protein Kinases; Mice; Mice, Transgenic; Neurons; Plaque, Amyloid

Disciplines

Biochemistry | Cell Biology | Cellular and Molecular Physiology | Molecular Biology

Abstract

Phosphorylation plays a central role in the dynamic regulation of the processing of the amyloid precursor protein (APP) and the production of amyloid-beta (Abeta), one of the clinically most important factors that determine the onset of Alzheimer's disease (AD). This has led to the hypothesis that aberrant Abeta production associated with AD results from regulatory defects in signal transduction. However, conflicting findings have raised a debate over the identity of the signaling pathway that controls APP metabolism. Here, we demonstrate that activation of the c-Jun N-terminal protein kinase (JNK) is essential for mediating the apoptotic response of neurons to Abeta. Furthermore, we discovered that the functional loss of JNK signaling in neurons significantly decreased the number of amyloid plaques present in the brain of mice carrying familial AD-linked mutant genes. This correlated with a reduction in Abeta production. Biochemical analyses indicate that the phosphorylation of APP at threonine 668 by JNK is required for gamma-mediated cleavage of the C-terminal fragment of APP produced by beta-secretase. Overall, this study provides genetic evidence that JNK signaling is required for the formation of amyloid plaques in vivo. Therefore, inhibition of increased JNK activity associated with aging or with a pathological condition constitutes a potential strategy for the treatment of AD.

Rights and Permissions

Citation: J Neurosci. 2011 Nov 23;31(47):16969-76. doi: 10.1523/JNEUROSCI.4491-11.2011. Link to article on publisher's site

Comments

Copyright © 2011 the authors. Publisher PDF posted as allowed by the publisher's author rights policy at http://www.jneurosci.org/site/misc/ifa_policies.xhtml. Copyright of all material published in The Journal of Neuroscience remains with the authors. The authors grant the Society for Neuroscience an exclusive license to publish their work for the first 6 months. After 6 months the work becomes available to the public to copy, distribute, or display under a Creative Commons Attribution 4.0 International (CC BY 4.0) license.

Related Resources

Link to Article in PubMed

PubMed ID

22114267

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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