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Related Concept Videos

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,...
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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,...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
Animal Mitochondrial Genetics02:59

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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...

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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

Longevity and mitochondrial membrane potential.

D A Knorre1, F F Severin

  • 1Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia. severin@genebee.msu.ru

Biochemistry. Biokhimiia
|July 24, 2012
PubMed
Summary
This summary is machine-generated.

Decreased mitochondrial membrane potential in yeast cells boosts longevity. This process, linked to mitochondrial DNA loss and retrograde signaling, activates mitophagy, clearing damaged mitochondria and extending lifespan.

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High-Resolution Fluorespirometry to Assess Dynamic Changes in Mitochondrial Membrane Potential in Human Immune Cells
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High-Resolution Fluorespirometry to Assess Dynamic Changes in Mitochondrial Membrane Potential in Human Immune Cells

Published on: May 24, 2024

Area of Science:

  • Cellular Biology
  • Genetics
  • Aging Research

Background:

  • Mitochondrial dysfunction is implicated in aging.
  • In Saccharomyces cerevisiae, decreased mitochondrial membrane potential (ΔΨm) correlates with increased replicative lifespan.
  • Mitochondrial DNA (mtDNA) loss triggers retrograde signaling, a transcriptional response.

Purpose of the Study:

  • To elucidate the role of mitochondrial membrane potential and retrograde signaling in yeast longevity.
  • To investigate the connection between retrograde response and mitophagy.
  • To understand how these pathways protect against accumulated mitochondrial damage.

Main Methods:

  • Utilized Saccharomyces cerevisiae as a model organism.
  • Investigated the effects of protonophores and mtDNA loss on mitochondrial membrane potential and lifespan.
  • Examined the activation of retrograde signaling and mitophagy pathways.

Main Results:

  • A decrease in mitochondrial membrane potential, induced by protonophores or mtDNA loss, extends yeast replicative lifespan.
  • Retrograde signaling is triggered by a drop in mitochondrial membrane potential.
  • Retrograde response activates mitophagy, leading to the degradation of damaged mitochondria.

Conclusions:

  • Activation of selective mitophagy is a key mechanism for lifespan extension by preventing the accumulation of damaged mitochondria.
  • Low protonophore concentrations may enhance the accuracy of mitophagy, selectively removing mitochondria with deleterious mtDNA mutations.