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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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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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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 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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Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Author Spotlight: Oxygen-Independent Assays to Measure Mitochondrial Function in Mammals
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Mitochondrial ROS Metabolism: 10 Years Later.

A Y Andreyev1, Y E Kushnareva, A N Murphy

  • 1Department of Pharmacology, University of California, San Diego, La Jolla, CA 92093-0601, USA. alex_andreyev@mitoexperts.com.

Biochemistry. Biokhimiia
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This summary is machine-generated.

Mitochondria's role in oxidative stress is key. This review updates knowledge on mitochondrial reactive oxygen species (ROS) generation and antioxidant systems over the last decade.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Mitochondrial Medicine

Background:

  • Mitochondria are central to cellular energy production and oxidative stress.
  • Understanding mitochondrial reactive oxygen species (ROS) metabolism is crucial for numerous diseases.
  • Previous reviews have established foundational knowledge, necessitating updated insights.

Purpose of the Study:

  • To provide an updated comprehensive review of mitochondrial ROS metabolism.
  • To highlight advancements in understanding ROS generation and antioxidant systems in mitochondria over the past 10 years.
  • To address ongoing controversies and misconceptions in the field.

Main Methods:

  • Literature review and synthesis of recent research findings.
  • Analysis of newly identified or re-appraised sources of mitochondrial ROS.
  • Evaluation of recent discoveries concerning the mitochondrial antioxidant system.

Main Results:

  • Identification and discussion of novel ROS sources, including p66(shc) protein and succinate dehydrogenase.
  • Re-evaluation of known ROS generation pathways within mitochondria.
  • Characterization of newly discovered properties of the mitochondrial antioxidant system.

Conclusions:

  • Significant progress has been made in understanding mitochondrial ROS metabolism.
  • New insights into ROS sources and antioxidant defenses necessitate a revised view of mitochondrial function.
  • Further research is required to resolve existing controversies and fully elucidate mitochondrial roles in oxidative stress.