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Preparation and Culture of Myogenic Precursor Cells/Primary Myoblasts from Skeletal Muscle of Adult and Aged Humans
10:10

Preparation and Culture of Myogenic Precursor Cells/Primary Myoblasts from Skeletal Muscle of Adult and Aged Humans

Published on: February 16, 2017

Sod2 overexpression preserves myoblast mitochondrial mass and function, but not muscle mass with aging

Sukkyoo Lee1, Holly Van Remmen, Marie Csete

  • 1Department of Anesthesiology, Emory University School of Medicine, Atlanta, GA, USA.

Aging Cell
|July 25, 2009
PubMed

Insights

Mitochondrial superoxide dismutase-2 (SOD2) protects muscle progenitor cells from aging and oxidative stress. SOD2 overexpression maintains mitochondrial DNA and differentiation, while deficiency impairs PI3-Akt signaling.

Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Aging Research

Background:

  • Superoxide dismutase-2 (SOD2) is crucial for mitigating oxidative stress, particularly in mitochondria.
  • Stem and progenitor cells are sensitive to oxidant stress, but their response to SOD2 manipulation is understudied.
  • Aging impacts mitochondrial function and cellular regenerative capacity.

Purpose of the Study:

  • To investigate the role of manganese superoxide dismutase-2 (MnSOD2) in muscle progenitor cell (myoblast) proliferation, differentiation, and mitochondrial maintenance during aging.
  • To characterize the involvement of the PI3-Akt signaling pathway in MnSOD2-modulated myoblast function.
  • To assess the impact of MnSOD2 overexpression and deficiency on mitochondrial DNA and function in young and aged myoblasts.

Main Methods:

  • Cultured myoblasts from young and aged mice with varying MnSOD2 levels (overexpressing, heterozygous, wild-type) were analyzed.
  • Proliferation, differentiation potential, and PI3-Akt signaling pathway phosphorylation were assessed.
  • Mitochondrial DNA abundance and mitochondrial function were evaluated in relation to aging and MnSOD2 status.

Main Results:

  • MnSOD2 overexpression protected mitochondrial DNA abundance and differentiation potential in aged myoblasts.
  • Sod2 deficiency in young myoblasts led to impaired PI3-Akt signaling (Akt phosphorylation) and reduced differentiation.
  • Aged myoblast Akt signaling was constitutively phosphorylated and unresponsive to stimuli, irrespective of MnSOD2 levels.

Conclusions:

  • MnSOD2 plays a vital role in protecting muscle progenitor cells against age-related mitochondrial dysfunction and loss of differentiation.
  • The PI3-Akt pathway is sensitive to superoxide levels, with specific sites being more vulnerable than others.
  • Maintaining mitochondrial integrity through MnSOD2 is crucial for preserving regenerative capacity during aging.

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