MiR-26b, upregulated in Alzheimer’s disease, activates cell cycle entry, tau-phosphorylation, and apoptosis in postmitotic neurons
Abstract
MicroRNA (miRNA) functions in the pathogenesis of major neurodegenerative diseases such as Alzheimer's disease (AD) are only beginning to emerge. We have observed significantly elevated levels of a specific miRNA, miR-26b, in the defined pathological areas of human postmortem brains, starting from early stages of AD (Braak III). Ectopic overexpression of miR-26b in rat primary postmitotic neurons led to the DNA replication and aberrant cell cycle entry (CCE) and, in parallel, increased tau-phosphorylation, which culminated in the apoptotic cell death of neurons. Similar tau hyperphosphorylation and CCE are typical features of neurons in pre-AD brains. Sequence-specific inhibition of miR-26b in culture is neuroprotective against oxidative stress. Retinoblastoma protein (Rb1), a major tumor suppressor, appears as the key direct miR-26b target, which mediates the observed neuronal phenotypes. The downstream signaling involves upregulation of Rb1/E2F cell cycle and pro-apoptotic transcriptional targets, including cyclin E1, and corresponding downregulation of cell cycle inhibitor p27/Kip1. It further leads to nuclear export and activation of Cdk5, a major kinase implicated in tau phosphorylation, regulation of cell cycle, and death in postmitotic neurons. Therefore, upregulation of miR-26b in neurons causes pleiotropic phenotypes that are also observed in AD. Elevated levels of miR-26b may thus contribute to the AD neuronal pathology.
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miR-26b is upregulated in AD and activates CDK5/p25 signaling, promoting tau hyperphosphorylation, aberrant cell-cycle re-entry, and neuronal apoptosis.
“On the other hand, miR-26b is upregulated in AD and activates CDK5/p25 signaling, promoting tau hyperphosphorylation, aberrant cell-cycle re-entry, and neuronal apoptosis (Absalon et al., 2013).”
From Cell-specific MicroRNA networks orchestrate the pathogenesis of Alzheimer’s disease (2026) · cites this paper as Absalon et al., 2013
Disruptions in miRNA networks involving miR-219-5p, miR-338-5p, and miR-23a/b destabilize myelin maintenance, axonal metabolic support, and cytoskeletal integrity, contributing to early cognitive decline and impaired signal transmission in AD.
“The combined actions of miR-219-5p, miR-338-5p, and miR-23a/b highlight how disruptions in miRNA networks destabilize myelin maintenance, axonal metabolic support, and cytoskeletal integrity, contributing to early cognitive decline and impaired signal transmission in AD (Absalon et al., 2013; Dugas et al., 2010; Li et al., 2018; Lin et al., 2013; Qian et al., 2018).”
From Cell-specific MicroRNA networks orchestrate the pathogenesis of Alzheimer’s disease (2026) · cites this paper as Absalon et al., 2013
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- Authors
- Absalon, S., Kochanek, D. M., Raghavan, V., & Krichevsky, A. M.
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2013-09-11
- Volume
- 33
- Issue
- 37
- Pages
- 14645-14659
- ISSN
- 0270-6474
- 1529-2401
- Cited by
- 259
- References
- 7
- Language
- en
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