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Related Experiment Videos

Searching for the exercise factor: is IL-6 a candidate?

B K Pedersen1, A Steensberg, C Fischer

  • 1The Copenhagen Muscle Research Centre, Copenhagen, Denmark. bkp@rh.dk

Journal of Muscle Research and Cell Motility
|November 12, 2003
PubMed
Summary

Interleukin-6 (IL-6), released by working muscles, acts as an energy sensor and signals to other organs. This signaling may mediate exercise

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Area of Science:

  • Exercise Physiology
  • Molecular Biology
  • Endocrinology

Background:

  • The precise signals muscles send to regulate bodily functions during exercise remain incompletely understood.
  • Previous research has broadly termed these signals 'work stimulus' or 'exercise factor'.
  • Identifying these signaling mechanisms is crucial for understanding exercise's health benefits.

Purpose of the Study:

  • To investigate the role of interleukin-6 (IL-6) as a potential mediator of exercise-induced health benefits.
  • To explore how IL-6 production is regulated by muscle activity and energy status.
  • To propose a new classification for muscle-derived signaling molecules.

Main Methods:

  • Analysis of IL-6 gene activation and mRNA transcription in response to muscle contractions.

Related Experiment Videos

  • Measurement of IL-6 release into circulation from working muscles.
  • Investigation of IL-6 effects on adipose tissue metabolism and inflammatory markers.

    • Main Results:

    • The IL-6 gene is rapidly activated and produces significant amounts of IL-6 mRNA in contracting muscles.
    • Working muscles release substantial levels of IL-6 into the bloodstream.
    • IL-6 influences adipose tissue by promoting lipolysis and increasing whole-body lipid oxidation.
    • IL-6 suppresses tumor necrosis factor-alpha (TNF-alpha) production, potentially mitigating insulin resistance and atherosclerosis.

    Conclusions:

    • Interleukin-6 (IL-6) functions as an 'energy sensor' in muscles, responding to exercise.
    • IL-6 released from skeletal muscle plays a key role in mediating exercise's metabolic and anti-inflammatory effects.
    • The term 'myokines' is proposed for cytokines released by skeletal muscles that act on other organs.