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Heart failure is a chronic, progressive condition that affects millions of people worldwide and often leads to death. The limited ability of the adult heart to repair itself has been a significant barrier in cardiovascular medicine. However, recent studies have shown that it may be possible to improve and regenerate heart muscle through various methods such as metabolic switches, stem cell therapy, protein partnerships, and exercise. These advancements in cellular reprogramming and organ regeneration have the potential to play a major role in future medicines to heal damaged hearts and save lives.
| Characteristics | Values |
|---|---|
| Heart regeneration | Succinate, a metabolic compound, can accumulate in the heart when it's deprived of oxygen, such as during a heart attack, and cause damage. Blocking another compound, succinate dehydrogenase, can prevent this damage and promote regeneration. |
| Heart repair | Exercise, such as walking, can strengthen the remaining heart muscle and keep arteries flexible, making it easier for the heart to pump blood. |
| Heart cell division | Heart muscle cells, or cardiomyocytes, have limited ability to replicate themselves. |
| Cellular reprogramming | Scientists are working on reprogramming scar tissue cells into healthy heart muscle cells, which could lead to future medicines to heal damaged hearts. |
| Stem cell therapy | Stem cell therapy has been shown to safely repair damaged heart muscle in chronic heart failure patients. |
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What You'll Learn
Stem cell therapy can repair damaged heart muscle
Heart failure is a chronic, progressive condition that reduces the heart's ability to pump blood efficiently. It is a leading cause of death in the United States, affecting 6 million American adults between 2015 and 2018. The condition is often caused by myocardial infarction, which occurs when there is a blockage in an artery that interrupts the steady flow of oxygen-rich blood to the heart. This interruption causes the affected area of the heart to begin dying, leading to the formation of scar tissue and potential heart failure.
Stem cell therapy has emerged as a promising treatment for repairing and regenerating damaged heart tissue. Stem cells have the unique ability to grow into a variety of heart cell types, including blood vessel walls, linings, and even beating heart cells. Scientists have been working on developing techniques to induce stem cells to become specific adult cell types, with the hope that they can be used to repair harm-causing cells in patients.
In a study published in NPJ Regenerative Medicine, researchers from the Mayo Clinic discovered how stem cells can restore cardiac muscle to its pre-heart attack condition. They found that human cardiopoietic cells, derived from adult stem cell sources of bone marrow, target and repair damaged proteins caused by a heart attack. This study provided valuable insights into the regenerative mechanisms of stem cells, offering a potential framework for broader applications of stem cell therapy in treating various conditions.
While stem cell therapy shows promising results in repairing damaged heart muscle, it is still in the research and development phase. Some studies have shown modest or no improvement in heart function, while others have demonstrated dramatic improvements. The varied outcomes are due to the different approaches used in harvesting and utilizing stem cells, such as using bone marrow mononuclear cells, cardiac-derived stem cells, or mesenchymal stromal cells. As researchers continue to explore the potential of stem cell therapy, it may soon become a standard treatment for repairing damaged heart muscle and improving the lives of those affected by heart failure.
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The benefits of aerobic exercise
Aerobic exercise is a type of physical activity that uses large muscle groups in the body and is rhythmic and repetitive. It increases your heart rate and the amount of oxygen your body uses. The more oxygen your body can use during physical activity, the more efficient your cardiovascular system is.
Walking, cycling, and swimming are some examples of aerobic exercises. These exercises are low-impact and can be adjusted to your fitness level. For instance, swimming in open water is more intense than in a pool, and water aerobics or water walking are good alternatives if you have joint pain.
Aerobic exercise has many benefits for your heart. It strengthens the heart muscle, making it easier for your heart to pump blood through your circulatory system. It also keeps your arteries flexible and helps fight atherosclerosis, the process that most likely led to a heart attack. Additionally, aerobic exercise can help reduce your risk of heart disease, high blood pressure, and high cholesterol.
Aerobic exercise can also help with weight management and building lean muscle mass, which can reduce your risk of heart disease. It can also improve your lung function, lower your blood pressure, and increase your HDL or "good" cholesterol while lowering your LDL or "bad" cholesterol.
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Protein partners that can heal heart muscle
Scientists at the UNC School of Medicine have discovered a new method for reprogramming scar tissue cells (fibroblasts) into healthy heart muscle cells (cardiomyocytes). This discovery could play a major role in future medicines to heal damaged hearts.
The study, led by Li Qian, PhD, found that a protein that helps make neurons can also reprogram scar tissue cells into heart muscle cells, especially in partnership with a second protein. The researchers used three existing techniques to reprogram mouse fibroblasts into cardiomyocytes, liver cells, and neurons. They found that the reprogramming of fibroblasts into neurons activated a set of cardiomyocyte genes. This activation was due to Ascl1, a master-programmer "transcription factor" protein that had been used to make neurons.
Ascl1 dramatically increased the efficiency of reprogramming by more than ten times. The researchers found that Ascl1 on its own activates both neuron and cardiomyocyte genes, but it shifts away from the pro-neuron role when accompanied by another transcription factor called Mef2c.
Qian and her team hope to make a two-in-one synthetic protein that contains the effective parts of both Ascl1 and Mef2c. This synthetic protein could be injected into failing hearts to repair them. This discovery represents another step towards future cell-reprogramming therapies for major disorders.
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The metabolic switch that may regenerate heart muscle
Heart failure is a chronic, progressive condition that reduces the heart's ability to pump blood effectively. It is a significant problem in the United States, with 6 million adults affected between 2015 and 2018. The limited capacity of the adult heart to repair itself is a major challenge in cardiovascular medicine, often leading to heart failure. However, recent research from the University of Wisconsin-Madison offers hope.
The UW team, led by Ahmed Mahmoud, a professor of cell and regenerative biology, has discovered a potential therapeutic approach for heart failure. Their study, published in the journal Circulation, found that temporarily blocking a key metabolic enzyme after a heart attack could help people regain cardiac function. This simple intervention could provide a way to restore cardiac function to an earlier state. The metabolic switch involves a change in how cells produce energy, transitioning from glycolysis to oxidative phosphorylation.
Earlier studies showed that a metabolic compound called succinate, produced by cells, can accumulate in the heart when deprived of oxygen during a heart attack. This triggers the production of harmful molecules called reactive oxygen species, which damage heart cells. However, blocking another compound, succinate dehydrogenase, can prevent succinate accumulation and subsequent damage. Inhibiting this compound can also prompt a metabolic shift to glycolysis, which promotes heart regeneration.
The research team investigated whether they could alter this metabolic switch to preserve the heart's ability to regenerate following damage. They found that malonate, a metabolite that blocks succinate dehydrogenase, resulted in complete heart regeneration and restored heart function in young mice. The treatment's effectiveness was confirmed by using another inhibitor, Atpenin A5, which produced similar results. The team also tested malonate in adult mice and found that it promoted the production of new heart cells and helped bring new blood vessels to the damaged region, leading to heart regeneration.
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The use of malonate to restore heart function
Heart failure is a chronic, progressive condition that reduces the heart's ability to pump blood effectively. It is a significant problem in the United States, affecting approximately 6 million adults between 2015 and 2018. The limited capacity of the adult heart to repair itself after myocardial infarction often leads to heart failure.
A metabolic switch occurs in the heart following birth, causing a loss of capacity for cardiac regeneration. This switch involves a change in the way cells produce energy, transitioning from glycolysis to oxidative phosphorylation. This transition results in increased reactive oxygen species (ROS) production, which can damage heart cells and lead to myocardial infarction.
Malonate, a metabolite, has been found to block succinate dehydrogenase, a compound that accumulates in the heart during oxygen deprivation and triggers the production of harmful molecules. By inhibiting succinate dehydrogenase, malonate can prevent the accumulation of succinate and subsequent damage to the heart. This inhibition also prompts a metabolic shift back to glycolysis, which promotes heart regeneration.
In a study, researchers used malonate in young mice to see if it would preserve the capacity of heart cells to regenerate following a heart attack. The treatment resulted in complete heart regeneration and restored heart function. Similar results were obtained using another inhibitor, Atpenin A5, confirming that the effects were due to the inhibition of succinate dehydrogenase.
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Frequently asked questions
While the heart muscle has a very limited ability to regenerate itself, walking and other forms of aerobic exercise can strengthen the remaining heart muscle.
Stem cell therapy has been shown to repair damaged heart muscle. Scientists are also developing cell-reprogramming therapies, which could involve a simple injection to reprogram harm-causing cells into beneficial ones.
Scientists have discovered a way to reprogram scar tissue cells (fibroblasts) into healthy heart muscle cells (cardiomyocytes).
A metabolite called malonate has been shown to preserve the capacity of heart cells to regenerate following a heart attack.
