The Study
Rapamycin Treatment Induces Lipidomic and Metabolic Changes in Skeletal Muscle of Aged Mice with Hyperactive mTORC1
This study shows that in old mice with overactive mTORC1, giving rapamycin was linked to changes in fats and chemicals in their muscles. We can’t say the drug caused the changes for sure, because we don’t know how the mice were grouped or if the study was fair and balanced.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Scientists gave a drug called rapamycin to old mice with overactive muscle growth signals to see how it changed their muscle chemicals.
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 59 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1These changes suggest rapamycin affects how aging muscles process fats and amino acids, which might matter for muscle health in older people.
- 2Rapamycin changed fat types in mouse muscles: more DG, CE, LPE; less PC, PG.
- 3It also increased arginine and proline use.
- 4Male mice had bigger changes than females.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Physiology
Year
2025
Authors
Hanna Kalenta, Rosario Maroto, Jacquelyn T. May, Jennifer J. Linares, Sean P. Kilroe, Erik D. Marchant, Trevor B. Romsdahl, W. Russell, Blake B. Rasmussen
Related Content
Claims (4)
Rapamycin might help older animals keep their muscle and stay lean by tweaking a key cell signal involved in aging.
In older mice with overactive muscle metabolism, giving them a drug called rapamycin changes the types of fats in their muscles — some go up, some go down — which might mean the drug helps reset how aging muscles handle fat.
Older mice with overactive mTORC1 had higher levels of certain muscle-related amino acid processes after taking rapamycin, which might help muscles handle stress and stay healthy.
Older male mice have bigger changes in muscle chemicals after taking rapamycin than older female mice, suggesting their bodies respond differently to this drug as they age.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.