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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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.
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Autophagic Cell Death01:18

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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.
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Toxic Reactions: Overview01:26

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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
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Mitochondria01:37

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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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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size...
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Related Experiment Video

Updated: Sep 26, 2025

Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima
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Acetaldehyde Induces Cytotoxicity via Triggering Mitochondrial Dysfunction and Overactive Mitophagy.

Tingting Yan1, Yan Zhao2, Zhongyu Jiang1

  • 1Department of Bioengineering, Harbin Institute of Technology, Weihai, 264209, Shandong, China.

Molecular Neurobiology
|April 19, 2022
PubMed
Summary

Excessive alcohol metabolite acetaldehyde triggers excessive mitophagy, damaging brain cells. Antioxidants like N-acetyl-L-cysteine can reduce this damage by mitigating oxidative stress and mitophagy.

Keywords:
AcetaldehydeDrp1MitophagyPINK1ParkinReactive oxygen species

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Toxicology

Background:

  • Alcohol overconsumption leads to brain damage and cognitive dysfunction.
  • Acetaldehyde, a toxic ethanol metabolite, is implicated in alcohol neurotoxicity.
  • Mechanisms of acetaldehyde-induced neuronal cell damage, particularly mitochondrial dysfunction, require further elucidation.

Purpose of the Study:

  • To investigate the role of mitophagy in acetaldehyde-induced cytotoxicity.
  • To explore the underlying mechanisms of acetaldehyde's neurotoxic effects on neuronal cells.

Main Methods:

  • Acetaldehyde treatment of SH-SY5Y cells.
  • Analysis of mitophagy markers (LC3-II, Beclin1, Atg5, Atg16L1, PINK1, Parkin, p62).
  • Assessment of mitochondrial mass and function.
  • Evaluation of the effects of autophagy inhibitors and N-acetyl-L-cysteine.

Main Results:

  • Acetaldehyde induced cytotoxicity and mitophagy in SH-SY5Y cells, evidenced by altered marker levels and PINK1/Parkin accumulation on mitochondria.
  • Acetaldehyde treatment led to a significant decrease in mitochondrial mass.
  • Autophagy inhibition preserved mitochondrial mass and reduced acetaldehyde-induced cytotoxicity.
  • N-acetyl-L-cysteine attenuated mitophagy and cytotoxicity, indicating a role for oxidative stress.

Conclusions:

  • Overactive mitophagy is a key mechanism contributing to acetaldehyde-induced cytotoxicity.
  • Oxidative stress mediates excessive mitophagy induced by acetaldehyde.
  • These findings offer insights into alcohol neurotoxicity and potential therapeutic targets.