For more than a century, heart disease has remained one of the leading causes of death in the United States and many other countries.
Heart attacks and strokes kill millions of people every year, often without warning. In many cases, these life-threatening events happen when a blood clot suddenly blocks blood flow to the heart or brain.
Doctors currently have several ways to treat blood clots, including medications that dissolve clots after they form and drugs that make blood less likely to clot. While these treatments have saved many lives, they also come with significant risks, particularly an increased chance of serious bleeding.
Now, researchers at Georgia Tech have discovered a promising new approach that may prevent dangerous blood clots from forming in the first place. Even more surprisingly, the potential treatment involves an inexpensive drug that has already been used safely in hospitals for decades.
The drug is called N-acetyl cysteine, commonly known as NAC. Most doctors are familiar with NAC because it is widely used to treat acetaminophen overdose.
Acetaminophen, sold under brand names such as Tylenol, is one of the most commonly used pain relievers in the world. When people take too much acetaminophen, NAC can help protect the liver from severe damage and save lives.
Because NAC has been used in medicine for many years, doctors already know a great deal about its safety profile. This makes it particularly attractive as a possible treatment for other diseases.
The new research focused on one of the most important causes of heart attacks and strokes: blood clot formation. Blood clotting is normally a helpful process.
When a blood vessel is damaged, clotting prevents excessive bleeding and helps wounds heal. However, when clots form inside blood vessels without a good reason, they can block blood flow and cause serious medical emergencies.
Blood clots develop when tiny blood components called platelets stick together. Platelets act like emergency repair workers, rushing to damaged blood vessels and forming plugs that stop bleeding. However, platelets need assistance from a large protein called von Willebrand factor, or VWF.
Researchers often describe VWF as a tightly coiled ball of yarn. Under normal conditions, the protein remains folded and relatively inactive. But when blood vessels are injured or blood flow becomes turbulent, VWF can unfold into long sticky strands. These strands capture platelets and help build blood clots.
Many current blood-thinning medications focus on preventing platelets from sticking together. Drugs such as aspirin and other antiplatelet medications can reduce the risk of heart attacks and strokes. However, because they interfere with the body’s natural clotting system, they can also increase the risk of dangerous bleeding.
This creates a difficult balance for doctors and patients. A medication may lower the risk of a heart attack, but it may also make it harder to stop bleeding after an injury, accident, or surgery.
Professor David Ku and his research team decided to approach the problem differently. Instead of targeting platelets directly, they looked for a way to stop VWF from becoming sticky in the first place.
Their research revealed that NAC can break certain chemical bonds that help VWF unfold into its clot-forming shape. By preventing VWF from opening up and becoming sticky, NAC may stop blood clots from developing before they ever begin.
To test their theory, the scientists used a specialized laboratory system designed to mimic blood flow through narrowed and damaged arteries. These are exactly the types of blood vessels where dangerous clots often form in people with heart disease.
The results were impressive. NAC completely prevented clot formation in the laboratory model. This suggested that the drug was highly effective at stopping the chain of events that normally leads to dangerous blood clots.
The researchers then moved to animal studies. When they tested NAC in mice, they observed similar results. The drug prevented clot formation and continued to provide protection for several hours.
One particularly encouraging finding was that the protective effects lasted for approximately six hours, even after NAC was no longer detectable in the bloodstream. This suggests the drug may produce lasting changes that continue to reduce clotting risk after treatment.
If future studies confirm these findings, NAC could potentially change how doctors manage patients at risk for heart attacks and strokes. Instead of relying solely on medications that thin the blood and increase bleeding risk, physicians might one day use NAC to stop dangerous clots from developing in the first place.
The researchers envision several possible uses. In emergency departments, a quick injection of NAC could help protect patients facing an immediate risk of clot-related complications. In the future, oral forms of the medication might even be used to provide ongoing protection for people with chronic cardiovascular disease.
Another major advantage is speed. Developing a completely new drug often takes many years and billions of dollars. Because NAC is already approved for medical use and has an established safety record, the path toward clinical testing may be much faster.
The research team is now working with the U.S. Food and Drug Administration to begin human clinical trials. These studies will be necessary to determine whether the benefits seen in laboratory and animal studies also occur in people.
Although many questions still need to be answered, the discovery represents an exciting step forward in cardiovascular medicine. A simple, inexpensive medication that can prevent dangerous blood clots without causing major bleeding problems would address one of the biggest challenges in heart disease treatment.
For now, researchers remain cautiously optimistic. If future clinical trials are successful, NAC could become a powerful new tool for preventing heart attacks and strokes, potentially helping millions of people worldwide avoid some of the most common and deadly medical emergencies.
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.
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The study was published in the journal Blood Advances.
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