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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.
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The Electron Transport Chain01:30

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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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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Peroxisomes01:24

Peroxisomes

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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...
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Electron Transport Chain: Complex III and IV01:43

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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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Regulation of Metabolism01:19

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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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NOX Dependent ROS Generation and Cell Metabolism.

Tiziana Pecchillo Cimmino1, Rosario Ammendola1, Fabio Cattaneo1

  • 1Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, 80131 Naples, Italy.

International Journal of Molecular Sciences
|February 11, 2023
PubMed
Summary

Reactive oxygen species (ROS) regulate cell physiology and can cause cytotoxicity. This review highlights how NADPH oxidase (NOX) enzymes modulate cancer cell metabolism, offering potential therapeutic targets.

Keywords:
NADPH oxidaseNOXROScell metabolismglycolytic enzymesmetabolic reprogrammingreactive oxygen speciesredox metabolism

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cancer Research
  • Cellular Physiology

Background:

  • Reactive oxygen species (ROS) have dual roles in cellular processes, acting as cytotoxic agents or signaling molecules.
  • Superoxide anion radical (O2·-), a key ROS, is generated by NADPH oxidase (NOX) enzymes and mitochondrial respiration.
  • Dysregulated redox balance and signaling are hallmarks of cancer, contributing to malignant progression and drug resistance.

Purpose of the Study:

  • To review the emerging roles of NOX enzymes in modulating metabolic reprogramming in cancer.
  • To explore the specific contributions of NOX1, NOX2, and NOX4 isoforms to cancer metabolism.
  • To identify NOX enzymes as potential therapeutic targets for altering tumor metabolism.

Main Methods:

  • Literature review focusing on the intersection of oxidative stress, metabolism, and cancer.
  • Analysis of the roles of specific NOX isoforms (NOX1, NOX2, NOX4) in cellular metabolism.
  • Discussion of therapeutic strategies targeting NOX enzymes for cancer treatment.

Main Results:

  • NOX enzymes are critical regulators of metabolic pathways in cancer cells.
  • Specific NOX isoforms (NOX1, NOX2, NOX4) significantly influence cancer cell metabolism.
  • Targeting NOX enzymes presents a promising strategy for disrupting tumor metabolism.

Conclusions:

  • NOX enzymes play a significant role in metabolic reprogramming within cancer.
  • NOX1, NOX2, and NOX4 are key players in modulating cancer metabolism.
  • Targeting NOX enzymes offers a novel therapeutic avenue for cancer treatment by rewiring tumor metabolism.