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Related Experiment Videos

Hsp70 expression in human skeletal muscle after exercise

A Puntschart1, M Vogt, H R Widmer

  • 1Department of Anatomy, University of Bern, Switzerland.

Acta Physiologica Scandinavica
|August 1, 1996
PubMed
Summary

A single bout of intense exercise significantly increases heat shock protein 70 (hsp70) mRNA in human muscle cells. However, hsp70 protein levels remain unchanged, suggesting mRNA analysis detects exercise-induced stress.

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Area of Science:

  • Exercise Physiology
  • Molecular Biology
  • Stress Response

Background:

  • Prolonged, high-intensity exercise induces physiological stress and cellular disturbances.
  • Heat shock proteins (HSPs) are cellular stress response indicators.
  • HSP70 is a key protein involved in cellular protection against stress.

Purpose of the Study:

  • To investigate the expression of heat-inducible heat shock protein 70 (hsp70) in human skeletal muscle cells following a single exercise bout.
  • To determine if exercise intensity and duration impact hsp70 mRNA and protein levels.

Main Methods:

  • Five untrained subjects performed a 30-minute treadmill exercise at their individual anaerobic threshold.
  • Muscle samples were analyzed for hsp70 mRNA and protein concentrations post-exercise.

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  • Time points for analysis included immediately after exercise, 30 minutes, and 3 hours post-exercise.

    • Main Results:

    • Hsp70 mRNA concentration increased fourfold at 4 minutes post-exercise.
    • Elevated hsp70 mRNA levels persisted at 30 minutes and 3 hours after exercise cessation.
    • Hsp70 protein concentration did not show significant changes within 3 hours post-exercise.

    Conclusions:

    • A single exercise bout increases hsp70 mRNA steady-state concentration in human skeletal muscle.
    • The exercise bout was insufficient to alter the basal hsp70 protein levels within 3 hours.
    • Analyzing hsp70 mRNA may serve as a sensitive indicator of cellular stress in tissues with high basal HSP levels.