How a diabetes drug helped rat hearts heal after a heart attack
Metformin attenuates post-infarction cardiac remodelling in rats, associated with changes in oxidative stress, energy metabolism, gut microbiota and metabolomics
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A diabetes medicine called metformin was given to rats after they had heart attacks. It didn't fix the damaged area, but it made the heart muscle less thick and scarred, reduced harmful stress in the heart, changed the good bacteria in their guts, and altered some chemicals in their blood.
Surprising Findings
Metformin improved heart structure and gut health without improving heart function or reducing the size of the heart attack damage.
It's counterintuitive that a drug can reverse harmful remodeling (like thickening and scarring) without fixing the core problem—the dead tissue. Most therapies aim to reduce infarct size.
Practical Takeaways
Do not take metformin for heart health without medical supervision.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A diabetes medicine called metformin was given to rats after they had heart attacks. It didn't fix the damaged area, but it made the heart muscle less thick and scarred, reduced harmful stress in the heart, changed the good bacteria in their guts, and altered some chemicals in their blood.
Surprising Findings
Metformin improved heart structure and gut health without improving heart function or reducing the size of the heart attack damage.
It's counterintuitive that a drug can reverse harmful remodeling (like thickening and scarring) without fixing the core problem—the dead tissue. Most therapies aim to reduce infarct size.
Practical Takeaways
Do not take metformin for heart health without medical supervision.
Publication
Journal
European Heart Journal
Year
2025
Authors
D. Queiroz, P. Ballin, G. A. F. Mota, N. F. Ferreira, C. R. Tonon, R. P. Cabral Filho, N. A. Grandini, J. S. Siqueira, T. Lazzarin, K. Okoshi, M. Okoshi, B. Polegato, M. Minicucci, L. Zornoff
Related Content
Claims (6)
When rats have a heart attack and are given metformin, their blood shows changes in certain natural chemicals—some go down, like arginine and tryptophan, while others, like azelaic acid, go up.
When rats have a heart attack and are given metformin, their hearts show less thickening and scarring, even though the size of the damage and overall heart function don’t get better or worse.
When rats have a heart attack, giving them metformin (a common diabetes drug) seems to help lower harmful stress in their heart tissue, compared to rats that don’t get the drug.
When rats have a heart attack and are given a common diabetes drug called metformin, their gut bacteria become more varied and diverse than in rats that didn’t get the drug.
In rats that had a heart attack, taking metformin didn’t make the heart damage smaller or improve how well the heart pumped, but it did help reduce some of the scarring and thickening in the heart muscle.