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Related Experiment Videos

Insulin-like growth factor-I and high protein diet decrease calpain-mediated proteolysis in murine muscular dystrophy

M A Wingertzahn1, M M Zdanowicz, A E Slonim

  • 1Department of Pediatrics, North Shore University Hospital-New York University School of Medicine, Manhasset 11030, USA.

Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
|July 2, 1998
PubMed
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High-protein diet and insulin-like growth factor I reduce muscle wasting in muscular dystrophy mice by decreasing calpain activity. These findings suggest potential therapeutic strategies for human muscular dystrophy.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Muscle wasting in muscular dystrophy (MD) is linked to an imbalance between protein synthesis and degradation.
  • Key proteolytic pathways in skeletal muscle include lysosomal cathepsin, calcium-dependent calpain, and ATP-dependent ubiquitin pathways.
  • Insulin-like growth factor I (IGF-I) and high-protein diets (HPD) have shown promise in reducing muscle proteolysis.

Purpose of the Study:

  • To investigate the effects of recombinant human IGF-I (rhIGF-I) and HPD on proteolytic pathways in the skeletal muscle of 129 ReJ dystrophic (dy) mice.
  • To determine if rhIGF-I and/or HPD can ameliorate muscle wasting in a mouse model of MD.
  • To elucidate the specific proteolytic pathways affected by these treatments.

Main Methods:

Related Experiment Videos

  • Treatment of 129 ReJ dy mice with rhIGF-I alone or in combination with HPD for 6 weeks.
  • Comparison with normal (Norm) nondystrophic (129 J) mice as controls.
  • Analysis of net proteolysis, calpain activity, cathepsin B activity, and ubiquitin levels in skeletal muscle.

    • Main Results:

    • Untreated dy mice showed increased net proteolysis, calpain activity, and ubiquitin levels compared to controls.
    • Both HPD and rhIGF-I treatments reduced proteolysis in dy mice.
    • Reduced proteolysis was associated with decreased calpain-mediated myofibrillar breakdown, potentially due to altered calpain autolysis or increased calpastatin.
    • Cathepsin B activity increased with HPD and rhIGF-I + HPD treatments.
    • Ubiquitin levels increased in rhIGF-I and rhIGF-I + HPD treated animals.

    Conclusions:

    • HPD and rhIGF-I effectively decrease proteolysis in the 129 ReJ dy mouse model.
    • The observed reduction in muscle wasting is partly attributed to decreased calpain activity.
    • These findings suggest that HPD and rhIGF-I may hold therapeutic potential for human MD.