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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,...
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,...
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,...
Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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

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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
08:15

Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs

Published on: August 15, 2025

Mitochondrial function as a determinant of life span.

Ian R Lanza1, K Sreekumaran Nair

  • 1Division of Endocrinology, Endocrinology Research Unit, Mayo Clinic College of Medicine, Rochester, MN, USA.

Pflugers Archiv : European Journal of Physiology
|September 17, 2009
PubMed
Summary

While caloric restriction extends lifespan in animals, it is not practical for humans. Regular aerobic exercise may enhance healthy life expectancy and potentially lifespan by improving mitochondrial function.

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Ratiometric Biosensors that Measure Mitochondrial Redox State and ATP in Living Yeast Cells
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Ratiometric Biosensors that Measure Mitochondrial Redox State and ATP in Living Yeast Cells

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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs

Published on: August 15, 2025

Ratiometric Biosensors that Measure Mitochondrial Redox State and ATP in Living Yeast Cells
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Ratiometric Biosensors that Measure Mitochondrial Redox State and ATP in Living Yeast Cells

Published on: July 22, 2013

Area of Science:

  • Gerontology
  • Mitochondrial Biology
  • Exercise Physiology

Background:

  • Human life expectancy has increased, but maximal lifespan remains largely unchanged.
  • Caloric restriction (CR) extends lifespan in various species, linked to improved mitochondrial function, but is not feasible for humans.
  • Physical activity shows promise for healthy life expectancy but not maximal lifespan.

Purpose of the Study:

  • To investigate the role of mitochondrial function in age-related decline and lifespan.
  • To explore the impact of aerobic exercise on mitochondrial health and its potential to influence lifespan.
  • To determine if exercise can mitigate age-related mitochondrial dysfunction.

Main Methods:

  • Review of existing literature on lifespan, caloric restriction, and physical activity.
  • Analysis of human studies on age-related changes in muscle mitochondrial DNA abundance and protein synthesis.
  • Examination of research on the effects of long-term aerobic exercise on mitochondrial function in humans and animals.

Main Results:

  • Age-related declines in muscle mitochondrial DNA abundance and protein synthesis are observed in humans.
  • Aerobic exercise largely prevents age-related declines in mitochondrial DNA abundance and function.
  • Mitochondrial dysfunction is implicated in age-related physical decline and potentially lifespan regulation.

Conclusions:

  • Age-related mitochondrial decline affects physical function and may regulate lifespan.
  • Regular aerobic exercise and a healthy diet may promote longevity through beneficial mitochondrial effects.
  • Exercise interventions hold potential for increasing healthy life expectancy and possibly prolonging lifespan.