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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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Mitochondrial Membranes01:45

Mitochondrial Membranes

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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,...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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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.
ROS generation is regulated and maintained at moderate levels necessary...
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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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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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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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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
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Is Mitochondrial Cell Fragility a Cell Weakness?

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Advances in Experimental Medicine and Biology
|November 28, 2017
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Summary
This summary is machine-generated.

Mitochondrial dysfunction, linked to aging and diseases, involves issues like reduced calcium buffering and increased reactive oxygen species. Understanding these mechanisms can reveal new therapeutic targets for cancer and liver diseases.

Keywords:
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pathology

Background:

  • Mitochondrial dysfunction is associated with cellular aging and cessation of cell function.
  • Downstream effects include impaired calcium buffering, elevated reactive oxygen species (ROS), and altered adenosine-5'-triphosphate (ATP) levels.
  • These alterations are implicated in various pathological diseases.

Purpose of the Study:

  • To discuss factors influencing mitochondrial dysfunction.
  • To highlight potential solutions and therapeutic strategies.
  • To emphasize the role of mitochondria in diseases like cancer and liver conditions.

Main Methods:

  • Literature review of factors affecting mitochondrial function.
  • Analysis of downstream consequences of mitochondrial dysfunction.
  • Exploration of therapeutic interventions targeting mitochondria.

Main Results:

  • Mitochondrial dysfunction contributes to aging and disease pathology.
  • Dysfunction is characterized by altered calcium homeostasis, increased oxidative stress (ROS), and energy deficits (ATP).
  • Mitochondria represent a significant therapeutic target for various diseases, including cancer.

Conclusions:

  • A deep understanding of mitochondrial dysfunction mechanisms is crucial.
  • This knowledge can facilitate the development of novel therapeutic targets.
  • Targeting mitochondria offers potential for treating cancer, liver diseases, and other pathologies.