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Cell interactome in sarcopenia during aging.

Laura González-Blanco1,2,3, Manuel Bermúdez2,4, Juan C Bermejo-Millo1,2,5

  • 1Department of Cell Biology and Morphology, Faculty of Medicine, University of Oviedo, Oviedo, Asturias, Spain.

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Summary
This summary is machine-generated.

Elderly individuals with functional dependence show significant muscle cellular damage. Impaired protein synthesis, blocked autophagy, and mitochondrial dysfunction lead to apoptosis and reduced muscle mass and function.

Keywords:
ElderlyMitochondriaMyogenic regulatory factorsOxidative stressSarcopeniaUnfolded protein response

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Area of Science:

  • Gerontology
  • Cell Biology
  • Muscle Physiology

Background:

  • Muscle aging involves complex cellular interactions affecting functional capacity.
  • Understanding the muscle cellular interactome in elderly individuals is crucial for addressing functional decline.

Purpose of the Study:

  • To investigate the differences in the muscle cellular interactome between functionally dependent and independent elderly individuals.
  • To identify key cellular mechanisms altered in muscle tissue of dependent elderly patients.

Main Methods:

  • Skeletal muscle tissue was obtained from 30 elderly patients (mean age 85) undergoing hip fracture surgery.
  • Patients were divided into functional-independent (n=15) and severely functional-dependent (n=15) groups based on the Barthel index.
  • Protein expression related to cellular mechanisms was analyzed using western blot.

Main Results:

  • Dependent elderly individuals exhibited decreased protein synthesis and impaired unfolded protein response (UPR).
  • Autophagy was blocked, leading to increased oxidative damage and mitochondrial complex dysfunction, reducing cellular energy.
  • Apoptosis was induced, while regenerative capacity was compromised, evidenced by altered myogenic regulatory factors and increased myostatin.

Conclusions:

  • Functionally dependent elderly patients display severe muscle cellular interactome alterations.
  • Decreased protein synthesis, blocked autophagy, and mitochondrial dysfunction contribute to apoptosis and loss of muscle mass and function.
  • These cellular deficits result in significant muscle contractile capacity damage in dependent elderly individuals.