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Redox Reactions01:27

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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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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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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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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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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.
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Redox balance and cardioprotection.

Francesca Tullio1, Carmelina Angotti, Maria-Giulia Perrelli

  • 1Dipartimento di Scienze Cliniche e Biologiche, Università di Torino, Ospedale S. Luigi, Regione Gonzole,10, 10043, Orbassano (TO), Italy.

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Reactive oxygen and nitrogen species (ROS/RNS) cause heart damage but are also key to cardioprotective signaling. S-nitrosylation in mitochondria is crucial for reducing cell death during heart attacks.

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Area of Science:

  • Cardiovascular Science
  • Biochemistry
  • Cell Biology

Background:

  • Coronary artery disease is a leading cause of death, with acute myocardial infarction causing significant heart muscle damage.
  • High levels of reactive oxygen and nitrogen species (ROS/RNS) lead to heart cell death and dysfunction.
  • Myocardial pre- and post-conditioning are protective strategies against heart attack damage.

Purpose of the Study:

  • To explore the dual role of ROS/RNS in heart injury and protection.
  • To investigate the mechanisms of ROS/RNS-mediated cardioprotection, focusing on pre- and post-conditioning.
  • To emphasize the role of S-nitrosylation and mitochondria in these protective processes.

Main Methods:

  • Review of existing literature on ROS/RNS, myocardial infarction, and cardioprotection.
  • Analysis of signaling pathways involving ROS/RNS in pre- and post-conditioning.
  • Focus on the role of protein S-nitrosylation and mitochondrial function.

Main Results:

  • ROS/RNS are paradoxically involved in both causing and protecting against heart damage.
  • Mitochondria play a critical role in regulating ROS/RNS production and signaling.
  • S-nitrosylation of mitochondrial proteins is a key mechanism in ROS/RNS-mediated cardioprotection.

Conclusions:

  • Understanding ROS/RNS signaling is vital for developing treatments for myocardial infarction.
  • Targeting mitochondrial function and S-nitrosylation offers promising therapeutic strategies.
  • Cardioprotection involves complex signaling networks where ROS/RNS and mitochondria are central players.