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Related Concept Videos

Mitochondria01:37

Mitochondria

14.6K
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,...
14.6K
Mitochondrial Membranes01:45

Mitochondrial Membranes

12.0K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
12.0K
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

14.9K
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...
14.9K
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

3.2K
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,...
3.2K
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

2.6K
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
2.6K
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

15.1K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Updated: Sep 5, 2025

Author Spotlight: Decoding Mitochondrial Aging
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Author Spotlight: Decoding Mitochondrial Aging

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Mitochondria in neurodegeneration.

Charleen T Chu1

  • 1Departments of Pathology and Ophthalmology, Pittsburgh Institute for Neurodegenerative Diseases, McGowan Institute for Regenerative Medicine, Center for Protein Conformational Diseases, Center for Neuroscience at the University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.

Current Opinion in Physiology
|July 11, 2022
PubMed
Summary

Mitochondrial dysfunction is key in neurodegenerative diseases like Parkinson's and Alzheimer's. Targeting mitochondrial repair mechanisms, such as PTEN-induced kinase 1 (PINK1), may offer neuroprotection.

Keywords:
Alzheimer diseasePTEN-induced kinase 1 (PINK1)Parkinson diseasedrug discoverymitochondrial calciummitochondrial proteasesmitophagysynaptic degeneration

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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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Author Spotlight: Establishing a New Fluorescence-Based Protocol for In Vivo Mitochondrial Morphology Analysis in Parkinson's Disease
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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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Area of Science:

  • Neuroscience
  • Mitochondrial Biology
  • Neurodegenerative Diseases

Background:

  • The brain requires significant energy, making mitochondrial health critical.
  • Mitochondrial pathology is a common factor in chronic neurodegenerative diseases.
  • Familial neurodegeneration involves complex mitochondrial lifecycle dynamics beyond acute injury models.

Purpose of the Study:

  • To review recent literature on mitochondrial mechanisms in major neurodegenerative diseases.
  • To emphasize the roles of mitochondrial quality control, transport, and calcium homeostasis.
  • To explore potential neuroprotective strategies targeting mitochondrial pathways.

Main Methods:

  • Literature review of studies on Parkinson's disease, Alzheimer's disease, frontotemporal dementia, Huntington's disease, and amyotrophic lateral sclerosis.
  • Focus on mitochondrial quality control mechanisms.
  • Analysis of synaptodendritic calcium homeostasis and mitochondrial transport.

Main Results:

  • Mitochondrial dysfunction is implicated across various neurodegenerative conditions.
  • Mitochondrial quality control, transport, and calcium handling are crucial.
  • PTEN-induced kinase 1 (PINK1) is identified as a key regulator.

Conclusions:

  • Mitochondrial health and its lifecycle are central to neurodegeneration.
  • Targeting mitochondrial pathways, particularly PINK1, shows promise for neuroprotection.
  • Interventions could address neuronal morphogenesis and dendritic arborization deficits.