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Related Concept Videos

Aging01:26

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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.
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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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Symbiotic Origin of Aging.

Edward F Greenberg1,2, Sergei Vatolin1

  • 11 The Cleveland Clinic Foundation, Department of Translational Hematology and Oncology Research, Taussig Cancer Center , Cleveland, Ohio.

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Aging results from a cellular conflict: quiescent cells versus the ancient propagation program of mitochondria, which originated from symbiotic bacteria. This imbalance drives age-related decline and pathology.

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Area of Science:

  • Cellular Biology
  • Evolutionary Biology
  • Mitochondrial Biology

Background:

  • Cellular aging is linked to altered mitochondrial dynamics, favoring fission.
  • Mitochondrial dynamics (fission/fusion) influence aging rates.
  • The symbiotic theory posits mitochondria originated from α-proteobacteria.

Purpose of the Study:

  • To explore the evolutionary origins of aging by linking mitochondrial dynamics to the symbiotic theory.
  • To understand how the ancient propagation program of mitochondria contributes to aging.

Main Methods:

  • Connecting experimental data on mitochondrial dynamics with the symbiotic theory of mitochondrial origin.
  • Analyzing the evolutionary implications of endosymbiosis on aging.

Main Results:

  • Aging cells exhibit unbalanced mitochondrial dynamics, with a shift toward fission.
  • Mitochondrial fission/fusion cycles impact aging.
  • Apoptosis may stem from the ancient lytic exit program of ancestral α-proteobacteria.

Conclusions:

  • Aging evolved from a conflict between host cell quiescence and the conserved mitochondrial propagation program.
  • Mitochondrial interdependence with eukaryotic cells evolved from an ancient endosymbiotic event.
  • The discordance between cellular states and mitochondrial replication drives aging and pathology.