Inflammation is a natural part of the body’s defense system. When you cut your finger or catch an infection, your immune system creates inflammation to help repair damaged tissue and fight harmful germs.
This short-term inflammation is healthy and usually disappears once the body has healed. However, sometimes inflammation does not switch off when it should. Instead, it continues for months or even years. This is known as chronic inflammation, and it can slowly damage healthy tissues throughout the body.
Scientists now believe that chronic inflammation plays an important role in many of the world’s most common diseases. Long-lasting inflammation has been linked to Alzheimer’s disease, Parkinson’s disease, type 2 diabetes, heart disease, arthritis, fatty liver disease, and several types of cancer.
As people grow older, the immune system often becomes more active even when there is no infection or injury. Long-term stress, obesity, poor diet, lack of exercise, smoking, pollution, and other environmental factors may also keep the immune system in a constant state of alert. Instead of protecting the body, it begins to harm healthy cells.
Researchers at the University of California, Berkeley, have now made an important discovery that could one day lead to new treatments for these diseases. Their study, led by Professor Danica Chen and published in the journal Cell Metabolism, identified what they describe as a molecular “switch” that helps control chronic inflammation.
At the center of the discovery is a group of immune proteins called the NLRP3 inflammasome. You can think of this system as part of the body’s security alarm. It detects signs of infection, injury, or danger and tells the immune system to produce inflammation.
Normally, this response is helpful because it protects the body from harm. The problem begins when the NLRP3 inflammasome becomes overactive and fails to switch off. Instead of producing inflammation only when it is needed, it continues to trigger immune responses that slowly damage healthy tissues.
The research team discovered that the inflammasome can be turned off through a natural process called deacetylation. Although the name sounds complicated, the idea is simple. A small chemical group is removed from the protein, changing its activity.
This process is controlled by another protein called SIRT2. When SIRT2 removes this small chemical tag, the NLRP3 inflammasome becomes inactive, helping stop unnecessary inflammation.
To test their discovery, the scientists carried out experiments in mice. They found that mice without the SIRT2 protein developed much more inflammation as they aged. By the time they reached two years old, which is considered old age for mice, they also had much higher insulin resistance.
Insulin resistance makes it harder for the body to control blood sugar and is one of the early steps toward developing type 2 diabetes and other metabolic diseases.
In another experiment, the researchers replaced the immune systems of older mice with new immune cells created from blood stem cells. These stem cells were designed to produce either an active or an inactive version of the NLRP3 inflammasome. The mice that received immune cells with the inactive version showed better insulin sensitivity within only six weeks.
Their bodies became better at using insulin to control blood sugar, suggesting that reducing chronic inflammation may help reverse some age-related health problems instead of simply slowing them down.
Although these experiments were carried out in mice, the findings are exciting because they suggest a completely new way of treating diseases linked to aging. Instead of focusing only on the symptoms, future medicines might target the underlying inflammation that contributes to many illnesses.
If scientists can safely develop drugs that control this immune system switch, they could potentially treat several diseases with one approach.
The discovery also raises important questions about when treatment should begin. In diseases such as Alzheimer’s, many clinical trials have not produced the hoped-for results.
One possible reason is that treatment may have started after too much damage had already occurred. If chronic inflammation begins many years before symptoms appear, treating it earlier could produce much better outcomes.
This research also reminds us that our daily lifestyle affects how our immune system behaves. Eating a balanced diet, exercising regularly, getting enough sleep, managing stress, avoiding smoking, and maintaining a healthy weight may all help reduce chronic inflammation.
Scientists are continuing to study how nutrition, environmental exposures, and other lifestyle factors influence the immune system throughout life.
While much more research is needed before this discovery leads to new medicines, the findings provide fresh hope. Understanding how to switch off harmful inflammation may one day help people stay healthier for longer and reduce the burden of many age-related diseases.
If you care about inflammation, please read studies about turmeric: nature’s golden answer to inflammation, and what to eat to reduce chronic Inflammation.
For more health information, please see recent studies about how a plant-based diet could help ease inflammation ,and Vitamin D deficiency linked to increased inflammation.
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