IL-6 signalling in exercise and disease.
Level 5 - mechanism / opinion, no new human data
Narrative review summarizing mechanistic cell studies and physiological experiments without systematic synthesis.
PubMed 17956334 · doi:10.1042/BST0351295
What was done
This narrative review synthesizes research on the metabolic and anti-inflammatory effects of interleukin-6 (IL-6) secreted by contracting skeletal muscle (myokines), drawing from cell culture models and human infusion studies.
What was found
No numerical values, sample sizes, or effect estimates are reported in the abstract. Qualitatively, muscle contraction triggers IL-6 release into circulation. In healthy humans, IL-6 infusion increased glucose disposal during a hyperinsulinemic-euglycemic clamp. In cultured myotubes, IL-6 increased fatty acid oxidation, basal and insulin-stimulated glucose uptake, and GLUT4 plasma membrane translocation via AMPK activation. IL-6 also promoted anti-inflammatory cytokine production and suppressed TNF-alpha.
Why it matters
It outlines a physiological mechanism whereby acute exercise-induced IL-6 acts as a beneficial metabolic regulator rather than merely a pro-inflammatory marker, with potential protective relevance against type 2 diabetes.
Limits
The abstract describes a narrative overview without systematic review methodology, quantitative effect sizes, or participant numbers. Mechanisms observed in acute infusion or in vitro myotubes may not fully translate to chronic metabolic disease states.
Cited by
- supports The surge of interleukin-6 released during exercise acts as a signal that activates AMP-activated protein kinase (AMPK) to stimulate fat mobilization and lower blood sugar.