The Study
TAS1R3 Regulates GTPase Signaling in Human Skeletal Muscle Cells for Glucose Uptake
This study looked at muscle cells from a few people with and without diabetes and found that a protein called TAS1R3 was lower in those with diabetes. It also showed that blocking this protein in lab-grown muscle cells made them worse at taking in sugar. But it didn't prove that low TAS1R3 causes diabetes—it just shows they're linked.
Analysis score
Maximum 58 for a case-control study.
Where the score came from
Your muscles use a special sugar-sensing button (TAS1R3) to help take in glucose after eating. In people with type 2 diabetes, this button is broken or missing, so muscles can't absorb sugar properly—even when insulin is present.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 548 / 100
Quality score
Researchers compare people who have a condition (cases) with similar people who do not (controls), looking back in time for differences in exposure. Useful but more prone to bias.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—since muscles handle 70–80% of post-meal sugar, this defect likely contributes to high blood sugar in diabetes.
- 2TAS1R3 levels are more than 50% lower in diabetic muscle.
- 3Blocking TAS1R3 in lab-grown muscle cells cuts glucose uptake by about 50%, even with insulin.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
International Journal of Molecular Sciences
Year
2025
Authors
Joseph M. Hoolachan, Rekha Balakrishnan, Karla E. Merz, Debbie C. Thurmond, R. Veluthakal
Related Content
Claims (5)
After eating, skeletal muscle removes the majority of glucose from the blood, which lowers blood sugar levels and reduces the amount of fat stored in the body.
Blocking the TAS1R3 protein in human muscle cells does not change the activity of IRS1 and AKT, two key proteins in the insulin signaling pathway, meaning TAS1R3 affects glucose uptake through a different mechanism than insulin.
In people with type 2 diabetes, the amount of TAS1R3 protein and its corresponding mRNA in skeletal muscle is more than 50% lower than in people without diabetes.
Blocking the TAS1R3 protein in human muscle cells reduces the amount of glucose those cells take up in response to insulin by about half.
The TAS1R3 protein controls how human skeletal muscle cells take up glucose in response to insulin by activating Rac1 and phospho-cofilin, without using the IRS1-AKT signaling pathway.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.