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Insulin signalling, exercise and cellular integrity.

J P Kirwan1, L F del Aguila

  • 1Department of Reproductive Biology, Case Western Reserve University School of Medicine, MetroHealth Medical Center, Cleveland, OH 44109-1998, U.S.A. jpk10@cwru.edu

Biochemical Society Transactions
|December 3, 2003
PubMed
Summary
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Eccentric exercise temporarily reduces insulin sensitivity due to muscle damage and inflammation, involving tumor necrosis factor-alpha (TNF-alpha). However, regular exercise training improves insulin sensitivity and signaling pathways.

Area of Science:

  • Exercise Physiology
  • Molecular Biology
  • Metabolic Health

Background:

  • Eccentric exercise, while generally beneficial, paradoxically causes temporary insulin resistance.
  • Muscle damage and cellular disruption are key features of eccentric exercise.

Purpose of the Study:

  • To elucidate the molecular mechanisms behind insulin resistance induced by eccentric exercise.
  • To explore the role of inflammation and specific signaling pathways in this phenomenon.

Main Methods:

  • Investigated insulin signaling pathways in skeletal muscle post-eccentric exercise.
  • Assessed changes in insulin receptor tyrosine phosphorylation, IRS-1, PI3K, Akt, and GLUT-4.
  • Examined the impact of tumor necrosis factor-alpha (TNF-alpha) on insulin signaling.

Related Experiment Videos

Main Results:

  • Eccentric exercise down-regulates key insulin signaling components (IRS-1, PI3K, Akt, GLUT-4).
  • Increased TNF-alpha secretion correlates with decreased PI3K activity and impairs insulin signaling.
  • Muscle cell integrity disruption and inflammation contribute to insulin resistance.

Conclusions:

  • A unifying hypothesis suggests inflammation (TNF-alpha) from muscle damage inhibits insulin signaling post-eccentric exercise.
  • Exercise training, conversely, enhances insulin sensitivity by improving signaling and reducing TNF-alpha.
  • Understanding these complex adaptations is crucial for therapeutic exercise recommendations for insulin resistance and type 2 diabetes.