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Related Experiment Videos

Effects of activity on growth factor expression.

G Goldspink1, S Y Yang

  • 1Department of Anatomy and Developmental Biology, Royal Free and University College Medical School, University of London, UK.

International Journal of Sport Nutrition and Exercise Metabolism
|March 28, 2002
PubMed
Summary

Mechano growth factor (MGF) and muscle IGF-1 are locally produced growth factors that support muscle repair and counteract apoptosis. Physical activity is crucial for elderly individuals to stimulate these factors, supplementing declining systemic IGF-1 levels.

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Area of Science:

  • Muscle physiology
  • Molecular biology
  • Endocrinology

Background:

  • Muscle mass is regulated by both local and systemic factors.
  • Insulin-like growth factor-1 (IGF-1) plays a key role in muscle regulation.
  • Aging is associated with decreased growth hormone and IGF-1 production.

Purpose of the Study:

  • To investigate the role of IGF-1 isoforms in muscle growth and repair.
  • To identify the specific stimuli that regulate the expression of mechano growth factor (MGF).
  • To understand the implications of MGF and muscle IGF-1 for aging and physical activity.

Main Methods:

  • Cloning of two IGF-1 isoforms (MGF and muscle L.IGF-I) cDNA.
  • Analysis of MGF expression following mechanical stimulation.

Related Experiment Videos

  • Physiological experiments involving stretch and electrical stimulation of muscles.

    • Main Results:

    • Two IGF-1 isoforms, MGF and muscle L.IGF-I, were identified.
    • MGF expression is induced by mechanical stimulation, particularly stretch combined with electrical stimulation.
    • MGF is a smaller, non-glycosylated isoform with a shorter half-life and different receptor affinities compared to liver IGF-1.
    • MGF promotes local protein synthesis and inhibits apoptosis, aiding tissue repair.
    • Muscle L.IGF-I is expressed at rest and upregulated by exercise, similar to liver IGF-1.

    Conclusions:

    • MGF is a potent local mediator of muscle repair and remodeling.
    • Mechanical stimuli, especially stretch and electrical stimulation, are key regulators of MGF expression.
    • The discovery of MGF and muscle IGF-1 highlights the link between physical activity and gene expression in muscle.
    • Maintaining physical activity in the elderly is vital to leverage local growth factor production and supplement declining systemic IGF-1.