Drugs originally developed to help people lose weight and control blood sugar may also help the heart recover after a heart attack, according to new research led by scientists at the University of Bristol and University College London (UCL).
The study suggests that these medications could protect the heart from additional damage and reduce the risk of serious complications that often occur after a heart attack.
The findings were published in the scientific journal Nature Communications.
Heart attacks occur when blood flow to part of the heart muscle is suddenly blocked. This usually happens when a clot forms in a coronary artery that supplies oxygen‑rich blood to the heart.
Without oxygen, the heart muscle begins to suffer damage within minutes. Emergency treatments are designed to reopen the blocked artery as quickly as possible so that blood can reach the heart tissue again.
Modern medical procedures such as angioplasty and stent placement are very effective at reopening the main artery.
However, many patients still experience a dangerous problem even after doctors successfully clear the blockage. In nearly half of heart attack patients, the tiny blood vessels deep inside the heart remain partly closed. This condition is known as “no‑reflow.”
When no‑reflow occurs, blood cannot properly reach certain areas of the heart muscle. Even though the main artery is open, the smallest blood vessels stay constricted, which prevents oxygen and nutrients from reaching the damaged tissue.
This can lead to further injury to the heart muscle and significantly increases the risk of future problems, including heart failure or death within the following year.
Researchers have been searching for ways to prevent this complication for many years. The new study focuses on a group of medications known as GLP‑1 receptor agonists.
These drugs mimic a natural hormone called glucagon‑like peptide‑1 (GLP‑1), which helps regulate blood sugar levels and appetite. Because of this effect, the medications are widely used to treat type 2 diabetes and, more recently, obesity.
In recent years, large clinical studies have shown that these drugs can also reduce the risk of heart attacks and strokes in some patients.
Interestingly, the protective effect on the heart appears to occur even when weight loss is small or when patients do not have diabetes. This observation led scientists to investigate how these medications might directly influence heart function.
In the new research, scientists explored the biological mechanisms that might explain the heart‑protective effects of GLP‑1 drugs. The team focused on tiny cells called pericytes. These small contractile cells surround the smallest blood vessels in the heart, known as capillaries. Pericytes can tighten or relax to control how much blood flows through these vessels.
Previous work by the research team showed that during a heart attack, pericytes tighten around the capillaries. This tightening narrows the vessels and contributes to the no‑reflow problem. Even after the main artery is reopened, these tiny vessels may remain squeezed shut, preventing blood from circulating properly.
The scientists wanted to know whether GLP‑1 drugs could relax these cells and restore blood flow to the damaged heart tissue.
Using animal models, the researchers discovered that GLP‑1 drugs activate special potassium channels within the cells that control blood vessel tone. When these channels open, the pericytes relax. As a result, the tiny blood vessels widen and allow blood to flow more freely through the heart muscle.
This improved circulation may help limit the amount of tissue damage that occurs after a heart attack. By restoring blood flow at the microscopic level, the drugs could reduce the risk of no‑reflow and improve recovery.
Dr. Svetlana Mastitskaya, a senior lecturer in cardiovascular regenerative medicine at Bristol Medical School and the lead author of the study, explained that this finding could be highly important for patient care.
She noted that even when emergency treatment successfully opens the blocked artery, many patients still suffer long‑term complications because blood cannot reach all areas of the heart muscle.
According to Dr. Mastitskaya, preventing the narrowing of these tiny blood vessels could help reduce the risk of heart failure and other serious complications that occur after a heart attack.
Professor David Attwell, a physiologist at University College London and co‑leader of the study, highlighted another important point. Because GLP‑1 drugs are already widely used in clinical practice for conditions such as diabetes, obesity, and kidney disease, researchers may be able to repurpose these medications more quickly than developing entirely new drugs.
If future clinical trials confirm the findings, doctors may eventually use GLP‑1 medications not only to control blood sugar or weight but also to help protect the heart after a heart attack.
From a scientific perspective, the study provides an important new explanation for how GLP‑1 drugs benefit the cardiovascular system. Previous studies showed that these medications lower the risk of major heart events, but the biological mechanisms were not fully understood.
By identifying the role of pericytes and potassium channels in regulating blood flow, the research reveals a new pathway through which these drugs may work.
However, it is important to note that the research was conducted using animal models rather than large groups of human patients. While the results are promising, clinical trials will be needed to determine whether the same protective effects occur in people recovering from heart attacks.
Nevertheless, the findings are encouraging. They suggest that drugs already used by millions of people could potentially be adapted to reduce damage after heart attacks and improve long‑term recovery.
In reviewing the study, the research highlights how understanding the smallest blood vessels in the heart can lead to major advances in treatment.
It also demonstrates the growing importance of drug repurposing, where existing medications are used in new ways to treat different diseases. If confirmed in future studies, this approach could provide a faster and more practical path to improving survival and recovery for heart attack patients.
If you care about heart health, please read studies about top foods to love for a stronger heart, and why oranges may help fight obesity, diabetes, and heart disease.
For more health information, please see recent studies about simple guide to a 7-day diabetes meal plan, and why you should add black beans to your plate.
Copyright © 2026 Knowridge Science Report. All rights reserved.
