Heart failure is one of the leading causes of illness and death around the world. It develops when the heart becomes too weak or too damaged to pump enough blood to meet the body’s needs.
As a result, people may experience tiredness, shortness of breath, swollen legs, and difficulty carrying out everyday activities. Although modern medicines and medical devices can help control symptoms and slow the disease, they cannot replace heart muscle that has already been lost.
Once heart muscle cells die after a heart attack or years of heart disease, the adult human heart has very little ability to grow new ones. Instead, the damaged area is replaced by scar tissue, which does not contract like healthy heart muscle. This is one of the main reasons heart failure often gets worse over time.
Now, researchers from Baylor College of Medicine in the United States and the QIMR Berghofer Medical Research Institute in Australia have made an important discovery that could eventually change how heart failure is treated.
Their study, published in the journal npj Regenerative Medicine, describes a new way to encourage heart muscle cells to grow and multiply. If future studies confirm these findings in people, the approach could one day help damaged hearts repair themselves instead of simply slowing further damage.
The research focused on heart muscle cells, also called cardiomyocytes. These specialized cells contract with every heartbeat, pushing blood throughout the body. During early development, cardiomyocytes can divide and increase in number.
However, shortly after birth, most of these cells lose that ability. This means that when large numbers of cardiomyocytes die because of a heart attack or another heart disease, the body cannot easily replace them.
Dr. Riham Abouleisa, an assistant professor of cardiothoracic surgery at Baylor College of Medicine and one of the study’s lead authors, explained that when injured heart muscle cells cannot be replaced with healthy new ones, the heart gradually becomes weaker and less able to function normally.
The scientists investigated the role of calcium, a mineral that is essential for normal heart function. Calcium helps control every heartbeat by allowing heart muscle cells to contract and relax.
Previous research had also suggested that calcium influences whether heart muscle cells remain inactive or begin dividing again. The team wanted to learn whether changing the movement of calcium into heart cells could trigger the growth of new muscle cells.
To test this idea, the researchers focused on a protein known as the L-Type Calcium Channel, or LTCC. This channel acts like a gateway that allows calcium to enter heart cells. Instead of increasing calcium, the researchers blocked the channel to reduce the amount of calcium entering the cells.
The results surprised the research team. When calcium entry was blocked, heart muscle cells switched on genes that encourage cell growth and replication. In other words, reducing calcium flow appeared to reactivate some of the natural processes needed for the heart to produce new muscle cells.
The researchers found that this effect could be achieved in two different ways. One approach used medicines to block the calcium channel, while the other used gene-based techniques. Both methods successfully encouraged heart muscle cells to activate growth-related genes.
Importantly, the findings were seen not only in heart tissue grown in the laboratory but also in living animals, giving researchers greater confidence that the discovery could have real biological importance.
Further investigation showed that the process appears to work by changing the activity of a protein called calcineurin. This protein has long been known to influence heart cell growth, and the new findings suggest that it plays an important role in linking calcium signals to the ability of heart muscle cells to multiply.
Dr. Tamer Mohamed, director of the Laboratory for Cardiac Regeneration at Baylor and a co-author of the study, said the discovery may also change how scientists think about medicines that already affect calcium movement in the body, including drugs such as nifedipine.
Existing medicines may provide valuable clues for developing future treatments that encourage heart repair, although much more research will be needed before any changes are made to patient care.
Dr. Todd K. Rosengart, chair of the Department of Surgery at Baylor College of Medicine, said that the idea of regrowing damaged heart tissue, once considered impossible, is becoming increasingly realistic. He believes discoveries like this move researchers closer to developing treatments that could eventually be tested in human clinical trials.
Although the results are exciting, this research is still at an early stage. The experiments were performed in laboratory-grown heart tissue and animal models, not in patients.
Scientists must now determine whether this approach is safe, whether the new heart muscle functions normally over the long term, and whether the treatment can improve survival and quality of life in people with heart failure.
Even so, the findings represent an important advance in the growing field of regenerative medicine. Rather than simply helping the heart work harder, future therapies may actually help it replace damaged muscle with healthy new cells.
If successful, this strategy could transform the treatment of heart failure and offer new hope to millions of people worldwide who currently have few options for repairing their damaged hearts.
If you care about heart health, please read studies about the best time to take vitamins to prevent heart disease, and calcium supplements could harm your heart health.
For more health information, please see recent studies that blackcurrants can reduce blood sugar after meal and results showing how drinking milk affects risks of heart disease and cancer.
Copyright © 2026 Knowridge Science Report. All rights reserved.
