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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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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.
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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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Translocation of Proteins into the Mitochondria01:19

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Electron Transport Chain: Complex III and IV01:43

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Aging01:26

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Ratiometric Biosensors that Measure Mitochondrial Redox State and ATP in Living Yeast Cells
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How the Disruption of Mitochondrial Redox Signalling Contributes to Ageing.

Beatriz Castejon-Vega1, Mario D Cordero1,2, Alberto Sanz1

  • 1School of Molecular Biosciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.

Antioxidants (Basel, Switzerland)
|April 28, 2023
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Mitochondrial reactive oxygen species (mtROS) are vital cellular messengers, not just damaging byproducts. Dysregulated mtROS signalling contributes to aging and disease, highlighting their complex role in cellular health and pathology.

Keywords:
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Area of Science:

  • Cellular Biology
  • Mitochondrial Function
  • Redox Signalling

Background:

  • Mitochondrial reactive oxygen species (mtROS) were historically viewed as metabolic byproducts causing cellular damage and driving aging.
  • Emerging evidence establishes mtROS as crucial cellular messengers regulating homeostasis, differentiation, proliferation, and survival.
  • Dysregulation of mtROS signalling is implicated in age-related and degenerative diseases.

Purpose of the Study:

  • To review characterized signalling pathways involving mtROS.
  • To explore pathological processes linked to mtROS.
  • To examine alterations in mtROS signalling during aging and its relationship with mitochondrial damage.

Main Methods:

  • Literature review of established signalling pathways involving mtROS.
  • Analysis of pathological processes associated with mtROS dysregulation.
  • Discussion of the role of mtROS signalling in the aging process.

Main Results:

  • mtROS function as essential signalling molecules, not merely damaging agents.
  • Specific mtROS signalling pathways are crucial for cellular fate decisions.
  • Altered mtROS signalling contributes to degenerative diseases and aging.

Conclusions:

  • mtROS are critical for cellular homeostasis and fate decisions.
  • Dysregulated mtROS signalling is a key factor in aging and disease pathogenesis.
  • The relationship between mitochondrial damage accumulation and aging requires further investigation.