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Related Concept Videos

Mitochondria01:37

Mitochondria

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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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Electron Transport Chain: Complex I and II01:46

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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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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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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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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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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Area of Science:

  • Aging research
  • Mitochondrial biology
  • Oxidative stress

Background:

  • The free-radical theory of aging suggests oxidative damage contributes to aging.
  • Mitochondria are key sources and targets of reactive oxygen species (ROS).
  • Hydrogen peroxide (H2O2) is a critical ROS degraded by catalase and glutathione peroxidase.

Purpose of the Study:

  • To investigate the role of hydrogen peroxide in aging and age-related diseases.
  • To examine the effects of targeted catalase expression in different subcellular compartments.

Main Methods:

  • Development of genetically modified mice: mitochondria-targeted catalase (mCAT), peroxisome-targeted catalase (pCAT), and nucleus-targeted catalase (nCAT).
  • Phenotypic analysis of mCAT mice for lifespan and healthspan extension.
  • Review of studies using mCAT mice to investigate mitochondrial oxidative stress in disease models.

Main Results:

  • Mice overexpressing catalase in mitochondria (mCAT) exhibited the most significant extension in lifespan and healthspan.
  • mCAT mice were used to study mitochondrial oxidative stress in models of metabolic syndrome, atherosclerosis, cardiac aging, neurodegeneration, and cancer.
  • Potential pleiotropic or adverse effects of ROS signaling and mCAT were considered.

Conclusions:

  • Targeting hydrogen peroxide reduction within mitochondria offers a promising strategy for extending lifespan and healthspan.
  • Mitochondrial oxidative stress plays a crucial role in aging and various age-related diseases.
  • Mitochondrial-targeted therapies, including small molecules, warrant further investigation.