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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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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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The Interplay Between Respiratory Supercomplexes and ROS in Aging.

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Mitochondrial supercomplexes (SCs) dynamically regulate reactive oxygen species (ROS) signaling. Aging disrupts this control, leading to excessive ROS production and cellular damage, challenging previous theories on aging mechanisms.

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Area of Science:

  • Mitochondrial biology
  • Aging research
  • Cellular signaling

Background:

  • Mitochondrial respiratory chain function relies on dynamic supercomplexes (SCs).
  • SCs regulate reactive oxygen species (ROS) generation, influencing cellular signaling and function.
  • ROS can act as vital physiological signals or damaging agents depending on concentration.

Purpose of the Study:

  • To critically examine the role of ROS in aging.
  • To investigate the relationship between mitochondrial structure, function, and aging.
  • To re-evaluate the contribution of mitochondrial ROS to aging.

Main Methods:

  • Review of recent advances in mitochondrial structure-function relationships.
  • Analysis of the role of supercomplexes in ROS regulation.
  • Examination of evidence linking altered ROS signaling to aging.

Main Results:

  • Under physiological conditions, dynamic SCs reversibly control ROS generation for signaling.
  • Aging leads to a loss of SC control over ROS production.
  • Irreversibly enhanced ROS production during aging causes altered signaling and structural damage.

Conclusions:

  • The role of mitochondrial ROS in aging is complex and linked to supercomplex dynamics.
  • Loss of control over ROS generation by SCs contributes to aging.
  • Targeting SC association could modulate ROS generation for therapeutic benefit.