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Related Concept Videos

Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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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Redox Reactions

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...
Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
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Oxidation of Phenols to Quinones

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ROS Live Cell Imaging During Neuronal Development
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NADPH oxidases and cardiac remodelling.

Adam Nabeebaccus1, Min Zhang, Ajay M Shah

  • 1Cardiovascular Division, King's College London British Heart Foundation Centre, London, SE5 9PJ, UK.

Heart Failure Reviews
|July 27, 2010
PubMed
Summary
This summary is machine-generated.

Chronic stress causes heart remodeling, driven by reactive oxygen species (ROS) from NADPH oxidases (NOXs). Understanding NOX pathways offers new therapeutic targets for heart failure.

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Area of Science:

  • Cardiovascular Biology
  • Redox Signaling
  • Molecular Medicine

Background:

  • Chronic stress induces cardiac remodeling, involving structural and functional changes.
  • Reactive oxygen species (ROS) play a key role in cardiac remodeling signaling pathways.
  • NADPH oxidases (NOXs) are critical sources of ROS in the heart, influencing redox signaling.

Purpose of the Study:

  • To review the role of NOX isoforms in cardiac remodeling.
  • To elucidate the redox-sensitive signaling pathways involved in NOX-mediated cardiac pathogenesis.
  • To identify potential therapeutic targets for heart failure based on NOX function.

Main Methods:

  • Literature review of studies on NOX isoforms (NOX2, NOX4) in cardiac remodeling.
  • Analysis of NOX-dependent signaling in cardiomyocyte hypertrophy, fibrosis, and dysfunction.
  • Examination of NOX involvement in myocyte apoptosis and ventricular remodeling.

Main Results:

  • NOX-dependent signaling contributes to cardiomyocyte hypertrophy, interstitial fibrosis, and post-myocardial infarction remodeling.
  • NOXs are implicated in the development of contractile dysfunction and myocyte apoptosis.
  • Specific NOX isoforms (NOX2 and NOX4) are key players in cardiac redox signaling.

Conclusions:

  • NOX enzymes are central to the pathogenesis of cardiac remodeling.
  • Targeting NOX-dependent pathways presents a promising strategy for treating heart failure.
  • Further research into NOX mechanisms can uncover novel therapeutic interventions for cardiovascular disease.