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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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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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Akt-induced cellular senescence: implication for human disease.

Tohru Minamino1, Hideyuki Miyauchi, Kaoru Tateno

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Cell Cycle (Georgetown, Tex.)
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Summary
This summary is machine-generated.

Inhibition of the Akt pathway extends cellular lifespan and may prevent diseases like atherosclerosis. Akt activation promotes cell growth and survival, potentially contributing to cancer development.

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Area of Science:

  • Cellular senescence and aging research
  • Molecular biology of aging pathways
  • Endothelial cell biology

Background:

  • Insulin/insulin-like growth factor-1/Akt pathway mutations extend lifespan across species.
  • Akt activation promotes mammalian cell proliferation, survival, and tumorigenesis.
  • Akt activity increases with cellular senescence.

Purpose of the Study:

  • To investigate the role of Akt in cellular lifespan regulation.
  • To determine if Akt inhibition affects human endothelial cell lifespan.
  • To elucidate the mechanisms by which Akt influences senescence and endothelial dysfunction.

Main Methods:

  • Analysis of Akt activity in relation to cellular senescence.
  • Inhibition of Akt in primary cultured human endothelial cells.
  • Investigation of the p53/p21-dependent pathway in Akt-mediated growth arrest.

Main Results:

  • Akt activity was found to increase with cellular senescence.
  • Inhibition of Akt extended the lifespan of primary human endothelial cells.
  • Constitutive Akt activation led to p53/p21-dependent senescence-like growth arrest and endothelial dysfunction.

Conclusions:

  • Akt plays a novel role in regulating cellular lifespan.
  • Modulating Akt activity may offer therapeutic strategies for age-related diseases.
  • Dysregulation of Akt in endothelial cells may contribute to atherosclerosis and diabetes mellitus.