Contraction signaling to glucose transport in skeletal muscle.
Level 5 - mechanism / opinion, no new human data
Narrative review of mechanistic and animal model literature without original human trial data.
PubMed 16036906 · doi:10.1152/japplphysiol.00175.2005
What was done
Narrative review evaluating the molecular pathways mediating contraction-induced, insulin-independent GLUT4 translocation and glucose transport in skeletal muscle, drawing on findings from transgenic and knockout animal models.
What was found
The abstract reports no numerical data. It summarizes that muscle contraction stimulates GLUT4 translocation via an insulin-independent mechanism. While AMP-activated protein kinase (AMPK) plays an important role, knockout and transgenic animal studies indicate it is not the sole mediator, suggesting redundant signaling pathways that may involve calcium, nitric oxide, bradykinin, and AS160.
Why it matters
Elucidating insulin-independent mechanisms of skeletal muscle glucose uptake may highlight novel drug targets to manage hyperglycemia in Type 2 diabetes.
Limits
The review reports no primary empirical data or quantitative effect sizes. Many referenced mechanistic findings derive from transgenic and knockout animal models, which may not fully reflect human physiology.
Cited by
- supports Muscle contraction triggers glucose transporter translocation to muscle cell surfaces independently of insulin.