Cited by 496Alzheimer's disease research and treatmentsAutophagy in Disease and TherapyMitochondrial Function and Pathology

Amyloid Beta and Phosphorylated Tau-Induced Defective Autophagy and Mitophagy in Alzheimer’s Disease

Open access
Reddy, P. Hemachandra, Oliver, Darryll MA·2019·Cells

Abstract

Alzheimer’s disease (AD) is a progressive neurodegenerative disease characterized by memory loss and multiple cognitive impairments. Several decades of intense research have revealed that multiple cellular changes are implicated in the development and progression of AD, including mitochondrial damage, synaptic dysfunction, amyloid beta (Aβ) formation and accumulation, hyperphosphorylated tau (P-Tau) formation and accumulation, deregulated microRNAs, synaptic damage, and neuronal loss in patients with AD. Among these, mitochondrial dysfunction and synaptic damage are early events in the disease process. Recent research also revealed that Aβ and P-Tau-induced defective autophagy and mitophagy are prominent events in AD pathogenesis. Age-dependent increased levels of Aβ and P-Tau reduced levels of several autophagy and mitophagy proteins. In addition, abnormal interactions between (1) Aβ and mitochondrial fission protein Drp1; (2) P-Tau and Drp1; and (3) Aβ and PINK1/parkin lead to an inability to clear damaged mitochondria and other cellular debris from neurons. These events occur selectively in affected AD neurons. The purpose of our article is to highlight recent developments of a Aβ and P-Tau-induced defective autophagy and mitophagy in AD. This article also summarizes several aspects of mitochondrial dysfunction, including abnormal mitochondrial dynamics (increased fission and reduced fusion), defective mitochondrial biogenesis, reduced ATP, increased free radicals and lipid peroxidation, and decreased cytochrome c oxidase (COX) activity and calcium dyshomeostasis in AD pathogenesis. Our article also discusses how reduced levels of Drp1, Aβ, and P-Tau can enhance the clearance of damaged mitochondria and other cellular debris by autophagy and mitophagy mechanisms.

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  • Disruption of autophagic flux and failure of autophagosomes to fuse with lysosomes result in accumulation of vesicles observed in dystrophic neurites and cell bodies in tauopathy models.

    “The disruption of the autophagic flux and the failure of autophagosomes to fuse with lysosomes result in the accumulation of vesicles, which can be observed in dystrophic neurites and cell bodies in tauopathy models [27,28,29].”

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  1. Lilienbaum, 2013, Relationship between the proteasomal system and autophagy, Int. J. Biochem. Mol. Biol., 4, 1

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Authors
Reddy, P. H., & Oliver, D. M.
Affiliations
Texas Tech University (US)
Corresponding author
Reddy, P. Hemachandra
Venue
Cells
Publisher
MDPI AG
Published
2019-05-22
Volume
8
Issue
5
Pages
488
ISSN
2073-4409 (ISSN-L)
OpenAlex
W2945779890
Cited by
496
References
127
Citations by year
2026: 54 · 2025: 81 · 2024: 77 · 2023: 79 · 2022: 80 · 2021: 72 · 2020: 47 · 2019: 6
FWCI
6.02
Type
journal article
Language
en
Open access
Locations
  • Cells (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institutes of Health (AG042178, AG047812, NS105473)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
Alzheimer's disease, amyloid-beta, hyperphosphorylated tau, mitophagy, mitochondrial dysfunction, Drp1, PINK1/Parkin pathway, mitochondrial fission, mitochondrial fusion, mitochondrial biogenesis, lipid peroxidation, cytochrome c oxidase, calcium dyshomeostasis, neurodegeneration
MeSH terms
Aging, Alzheimer Disease, Animals, Autophagy, Cell Line, Humans, Mitochondria, Neurons, Phosphorylation, Amyloid beta-Peptides, tau Proteins, Mice, Mitochondrial Dynamics, Mitophagy

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