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Related Concept Videos

Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Alzheimer's Disease: Overview01:26

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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Autophagy01:27

Autophagy

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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Autophagic Cell Death01:18

Autophagic Cell Death

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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
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Related Experiment Video

Updated: Nov 22, 2025

Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima
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Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima

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Aging-Dependent Mitophagy Dysfunction in Alzheimer's Disease.

Mingxue Song1, Xiulan Zhao1, Fuyong Song2

  • 1Department of Toxicology and Nutrition, School of Public Health, Cheeloo College of Medicine, Shandong University, 44 Wenhuaxi Road, Jinan, 250012, Shandong, People's Republic of China.

Molecular Neurobiology
|January 8, 2021
PubMed
Summary

Mitophagy, the process of clearing damaged mitochondria, declines with age and contributes to Alzheimer's disease (AD) progression. Restoring mitophagy may offer a therapeutic strategy for AD.

Keywords:
Alzheimer’s diseasemitochondrial dysfunctionmitophagyneuroinflammation

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Gerontology

Background:

  • Alzheimer's disease (AD) is a neurodegenerative disorder marked by amyloid plaques and neurofibrillary tangles.
  • Mitochondrial dysfunction is increasingly recognized as a key factor in AD pathogenesis.
  • Mitophagy, a crucial mitochondrial quality control process, declines with aging.

Purpose of the Study:

  • To review age-associated decline in mitophagy.
  • To explore the role of mitochondrial dysfunction in AD.
  • To discuss the mechanisms linking impaired mitophagy to neuronal cell death in AD.

Main Methods:

  • Literature review of studies on aging, mitophagy, and Alzheimer's disease.
  • Analysis of evidence linking mitophagy to mitochondrial dysfunction and AD pathologies.
  • Discussion of molecular mechanisms involved in mitophagy and neurodegeneration.

Main Results:

  • Evidence indicates a significant decline in mitophagy activity in aging human brains.
  • Impaired mitophagy contributes to bioenergetic deficits, oxidative stress, and inflammation in AD.
  • Defective mitophagy exacerbates amyloid-beta and tau pathologies, leading to neuronal loss.

Conclusions:

  • Age-related mitophagy decline is a critical factor in Alzheimer's disease pathogenesis.
  • Therapeutic strategies targeting mitophagy restoration hold promise for ameliorating AD.
  • Understanding mitophagy dysfunction is key to developing novel AD treatments.