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Related Concept Videos

Redox Reactions01:27

Redox Reactions

1.2K
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

50.9K
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 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...
4.6K
Redox Equilibria: Overview01:23

Redox Equilibria: Overview

1.4K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Author Spotlight: Radiotherapy and Clonogenic Assays for Advancing Cancer Research and Personalized Medicine
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Redox proteins and radiotherapy.

Y Zhang1, S G Martin1

  • 1Academic Unit of Clinical Oncology, University of Nottingham, School of Medicine, Nottingham University Hospitals NHS Trust, City Hospital Campus, Nottingham, UK.

Clinical Oncology (Royal College of Radiologists (Great Britain))
|March 4, 2014
PubMed
Summary
This summary is machine-generated.

Radiotherapy

Keywords:
Radiosensitivityradiotherapyreactive oxygen speciesredox homeostasisredox imagingredox proteins

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Area of Science:

  • Oncology
  • Radiation Biology
  • Biochemistry

Background:

  • Conventional radiotherapy causes DNA damage via ionizing radiation.
  • Most damage stems from free radicals produced by water radiolysis, inducing oxidative stress.
  • Cellular antioxidant systems modulate this oxidative stress and radiation response.

Purpose of the Study:

  • To explore how cellular redox homeostasis systems influence radiotherapy efficacy.
  • To identify antioxidant redox proteins as potential targets for enhancing radiation therapy.
  • To discuss their role as prognostic and predictive biomarkers.

Main Methods:

  • Review of cellular systems regulating redox homeostasis.
  • Discussion of antioxidant redox proteins and their role in radiation resistance.
  • Analysis of targeting these systems to improve radiosensitivity.

Main Results:

  • Cancer cells with high antioxidant protein levels may exhibit radioresistance.
  • Targeting these redox systems presents a strategy to enhance radiotherapy.
  • Redox homeostasis systems can serve as biomarkers for treatment response.

Conclusions:

  • Modulating cellular antioxidant systems can overcome radioresistance.
  • Targeting redox balance is a promising approach to improve radiotherapy outcomes.
  • Understanding redox homeostasis is key to personalized radiation oncology.