HMN 2026: How GLP-1 in joint fluid may let weight-loss drugs target arthritis directly

Arthritis includes a range of conditions that affect the joints, from inflammatory diseases such as rheumatoid arthritis and psoriatic arthritis to more common conditions like osteoarthritis. Many people experience pain, stiffness, and a reduced quality of life. Treatment today focuses on reducing inflammation and relieving symptoms, depending on the type of arthritis. However, researchers from the Department of Biomedicine at Aarhus University have now identified a new possible route for future treatments. Their research is published in The Lancet Rheumatology journal.

Associate Professor Tue Wenzel Kragstrup, who led the new study, says, “Our study shows that the body’s own GLP-1 hormone is present only in very small amounts in the joints. This means that its natural effect in the joint is likely to be limited. However, it also suggests that GLP-1-based medication, which is administered in much higher doses, may be able to influence inflammation directly in the joints.”

In other words, because GLP-1 medication contains such high doses of the hormone, it may also have an effect in the joints, where levels are otherwise low.

“Weight loss is already part of the recommendations for many patients with arthritis, but our study may indicate that medication such as Wegovy could have a dual effect—both through weight loss and by increasing GLP-1 levels in the joints,” says Kragstrup.

The study is based on analyses of blood and joint fluid samples from patients with arthritis. The data analysis was carried out by medical doctor and Ph.D. student Mads Brüner, in collaboration with Ph.D. student Amalie Broksø. According to Brüner, the level of GLP-1 is directly linked to the levels in the blood of arthritis patients:

“We can see that the levels of GLP-1 in joint fluid are closely linked to the levels in the blood. This suggests that it is primarily the amount of GLP-1 circulating in the body that determines how much reaches the joint,” he says.

More research needed

Previous studies have linked GLP-1 to possible anti-inflammatory effects, but this is the first time GLP-1 has been detected in joint fluid in arthritis patients, says Kragstrup.

“Our findings provide a biological basis for investigating whether GLP-1-based medication may have direct effects in the joints—beyond the known effects on weight and metabolism. However, we have not demonstrated that the treatment works against arthritis. This will require a number of clinical studies,” he says.

Therefore, arthritis patients should not expect to be prescribed GLP-1 medication as a direct treatment for their condition in the near future, he adds, “The next step is to investigate whether the medication reaches the joints in sufficient quantities and actually reduces inflammation in the joints.”

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