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Related Concept Videos

Redox Reactions01:27

Redox Reactions

311
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...
311
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

15.3K
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

8.0K
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...
8.0K
Peroxisomes01:24

Peroxisomes

15.2K
Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
15.2K
Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

8.3K
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...
8.3K
Redox Equilibria: Overview01:23

Redox Equilibria: Overview

1.2K
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...
1.2K

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Understanding Cellular Redox Homeostasis: A Challenge for Precision Medicine.

Verena Tretter1, Beatrix Hochreiter1, Marie Louise Zach1

  • 1Department of Anesthesia, General Intensive Care and Pain Management, Medical University of Vienna, 1090 Vienna, Austria.

International Journal of Molecular Sciences
|January 11, 2022
PubMed
Summary
This summary is machine-generated.

Redox biology studies cellular oxidation-reduction balance. Targeting oxidative stress is complex due to delicate cellular systems, necessitating precision medicine approaches for effective therapeutic outcomes.

Keywords:
antioxidantsoxidantsprecision medicineredox homeostasis

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Area of Science:

  • Redox biology
  • Cellular homeostasis
  • Biochemical signaling

Background:

  • Organisms rely on anabolic and catabolic reactions, involving substrate oxidation and reduction, for physiological functions.
  • Redox biology investigates the regulation of redox homeostasis and its disruption in diseases characterized by oxidative or reductive stress.
  • Oxidative stress, an imbalance in oxidant generation and antioxidant defense, involves reactive species that act as signaling molecules at physiological levels but cause damage when accumulated.

Purpose of the Study:

  • To explore the complexities of redox homeostasis and its role in disease pathology.
  • To address the challenges in therapeutically targeting oxidative stress.
  • To highlight the need for precision medicine in redox-related diseases.

Main Methods:

  • Review of redox biology principles and mechanisms.
  • Analysis of the role of reactive species in cellular signaling and damage.
  • Examination of the limitations of broad-spectrum antioxidants.

Main Results:

  • Cellular redox systems are highly delicate and compartmentalized, varying with physiological and pathological states.
  • Reactive species function as crucial signaling molecules, making non-targeted antioxidant therapies often ineffective.
  • The complexity of redox regulation poses significant challenges for disease treatment.

Conclusions:

  • Therapeutic strategies for oxidative stress must account for the nuanced nature of cellular redox systems.
  • Precision medicine offers a promising avenue for developing targeted therapies for redox-related diseases.
  • Further research into specific redox pathways is essential for advancing clinical interventions.