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Related Concept Videos

Mitochondria01:37

Mitochondria

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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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.
ROS generation is regulated and maintained at moderate levels necessary...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

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Related Experiment Video

Updated: Jul 7, 2026

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
06:53

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry

Published on: November 23, 2011

Mitochondrial dysfunction as a cause of ageing.

A Trifunovic1, N-G Larsson

  • 1Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden.

Journal of Internal Medicine
|January 30, 2008
PubMed
Summary

Mitochondrial dysfunction contributes to aging by causing mutations in mitochondrial DNA (mtDNA) and impairing cellular function. While linked to aging, its exact role in mammalian aging requires further investigation.

Area of Science:

  • Gerontology
  • Mitochondrial Biology
  • Molecular Biology

Background:

  • Mitochondrial dysfunction is a key factor in mammalian aging.
  • Aging correlates with accumulating mitochondrial DNA (mtDNA) mutations and reduced respiratory chain function.
  • Age-associated respiratory chain deficiency is cell-specific and affects various tissues.

Purpose of the Study:

  • To investigate the role of mitochondrial dysfunction in the aging process.
  • To explore the link between somatic mtDNA mutations and aging phenotypes.
  • To examine the relationship between mitochondrial dysfunction, oxidative stress, and cell loss during aging.

Main Methods:

  • Analysis of age-associated changes in mitochondrial DNA (mtDNA) and respiratory chain function in mammals.

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Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry
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Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry

Published on: May 5, 2022

Related Experiment Videos

Last Updated: Jul 7, 2026

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
06:53

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry

Published on: November 23, 2011

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry
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Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry

Published on: May 5, 2022

  • Studies using mtDNA mutator mice to assess the impact of somatic mtDNA mutations on aging phenotypes.
  • Investigation of reactive oxygen species (ROS) generation in respiratory-chain-deficient models.

    • Main Results:

    • Accumulation of somatic mtDNA mutations and decline in respiratory chain function are associated with aging in mammals.
    • Increased somatic mtDNA mutations in mice directly cause various aging phenotypes, including osteoporosis and hair graying.
    • Respiratory-chain-deficient cells are prone to apoptosis, suggesting cell loss as a consequence of mitochondrial dysfunction.
    • Contrary to common assumptions, significant increases in oxidative stress are not consistently observed in models of mitochondrial dysfunction.

    Conclusions:

    • Mitochondrial dysfunction, characterized by mtDNA mutations and impaired respiratory chain function, plays a role in mammalian aging.
    • While mtDNA mutations can induce aging phenotypes, the direct causal link and overall contribution to aging require further elucidation.
    • The association between mitochondrial dysfunction and increased reactive oxygen species (ROS) is not strongly supported by experimental evidence in aging models.