General aspects of muscle glucose uptake.
Level 5 - mechanism / opinion, no new human data
Narrative review of molecular mechanisms and physiological pathways without systematic methodology or primary human data.
PubMed 25761221 · doi:10.1590/0001-3765201520140225
What was done
This narrative review summarizes molecular pathways regulating peripheral glucose uptake in skeletal muscle, focusing on insulin-dependent signaling (IRS-1 and PI3K) and contraction-mediated insulin-independent signaling (involving AMPK, nitric oxide, bradykinin, AKT, reactive oxygen species, and calcium), as well as the modulating effects of exercise, diet, and pharmacology.
What was found
The abstract reports no numerical data, sample sizes, or statistical metrics. It describes qualitatively that while insulin resistance impairs insulin-stimulated glucose uptake in individuals with type 2 diabetes, contraction-stimulated glucose uptake during exercise remains intact through insulin-independent GLUT4 translocation.
Why it matters
Clarifying that exercise utilizes distinct, intact molecular pathways for GLUT4 translocation reinforces exercise as a non-pharmacological therapy for type 2 diabetes and highlights targets for drugs designed to mimic muscle contraction pathways.
Limits
The abstract provides no primary empirical data, search parameters, or study counts. Findings are presented as narrative mechanistic overviews rather than synthesized clinical or experimental trial results.
Cited by
- supports Physical activity stimulates glucose transporters and allows muscles to take up glucose directly without requiring insulin.
- supports Skeletal muscle contraction stimulates glucose uptake into muscle cells independently of insulin.