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Updated: May 24, 2026
10:10
Preparation and Culture of Myogenic Precursor Cells/Primary Myoblasts from Skeletal Muscle of Adult and Aged Humans
Published on: February 16, 2017
Myostatin is associated with age-related human muscle stem cell dysfunction
Bryon R McKay1, Daniel I Ogborn, Leeann M Bellamy
1Department of Kinesiology, McMaster University, Hamilton, ON, Canada, L8S 4L8.
Summary
Older males exhibit reduced muscle stem cell function and proliferation compared to younger men, indicating an age-related decline in muscle regeneration capacity. This impairment is linked to increased myostatin levels in specific muscle fiber types.
Area of Science:
- Muscle physiology
- Aging research
- Regenerative medicine
Background:
- Human aging is characterized by sarcopenia, a progressive loss of muscle mass.
- Muscle stem cells are crucial for muscle repair and regeneration.
- Age-related changes in muscle stem cell function may contribute to sarcopenia.
Purpose of the Study:
- To investigate the myogenic response to muscle loading in older males compared to younger controls.
- To analyze age-related differences in muscle stem cell number, proliferation, and function.
- To explore the role of myostatin in age-related muscle stem cell impairment.
Main Methods:
- Comparison of older males (70±4 yr) and younger controls (21±3 yr) after acute unilateral muscle loading.
- Collection of muscle biopsies and blood samples at baseline and 48 hours post-loading.
- Analysis of muscle stem cells using flow cytometry, immunofluorescent microscopy, and molecular assays (protein and mRNA).
Main Results:
- Older males had 35% fewer basal muscle stem cells and impaired proliferation, particularly in type II fibers.
- Myogenic progression was significantly blunted in older males.
- Myostatin protein and mRNA levels were elevated twofold in older males, with increased colocalization to type II-associated stem cells post-loading.
Conclusions:
- Aging impairs muscle stem cell function in a fiber type-specific manner.
- Elevated myostatin in aged muscle stem cells likely contributes to reduced myogenic capacity.
- These findings provide a mechanism for age-related sarcopenia and highlight potential therapeutic targets.
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