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Related Concept Videos

Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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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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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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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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Updated: Mar 6, 2026

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

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Redox Systems, Antioxidants and Sarcopenia.

Bertrand Fougere1,2, Gabor Abellan van Kan1,2, Bruno Vellas1,2

  • 1Gerontopole, Centre Hospitalier Universitaire de Toulouse, Toulouse, France.

Current Protein & Peptide Science
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PubMed
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Oxidative stress contributes to aging and sarcopenia. While antioxidants may help, current evidence for their effectiveness in preventing age-related muscle loss is inconclusive, requiring further research.

Keywords:
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Area of Science:

  • Gerontology
  • Cellular Biology
  • Biochemistry

Background:

  • Aging involves increased oxidative stress, impairing cellular functions and contributing to age-related diseases.
  • Innate antioxidant defenses decline with age, leading to an imbalance favoring reactive oxygen species.
  • Sarcopenia, the age-related loss of muscle mass and function, shares biological mechanisms with aging, including oxidative stress.

Purpose of the Study:

  • To review the role of oxidant/antioxidant systems in sarcopenia development.
  • To discuss the potential of antioxidant agents in mitigating age-related conditions and sarcopenia.
  • To evaluate the current evidence for antioxidant supplement efficacy in combating age-related decline.

Main Methods:

  • Literature review of studies on aging, oxidative stress, and sarcopenia.
  • Analysis of the mechanisms linking oxidant/antioxidant imbalance to muscle aging.
  • Examination of research on antioxidant interventions for age-related diseases.

Main Results:

  • Oxidative stress is implicated in the structural and functional decline of cells during aging.
  • An imbalance between pro-oxidant and antioxidant species is a significant factor in sarcopenia.
  • Evidence supporting the protective effects of antioxidant supplements against age-related conditions remains unclear.

Conclusions:

  • Oxidant/antioxidant systems play a crucial role in the development of the sarcopenic phenotype.
  • Antioxidant agents are explored for their potential to maintain homeostasis and protect against aging.
  • Further research is necessary to clarify the ambiguous evidence regarding antioxidant supplement benefits for aging and sarcopenia.