0
0
May 25, 2025
A groundbreaking study from the Sahlgrenska Academy at the University of Gothenburg has identified specific nerve cells in the brain that are responsible for the beneficial weight loss effects of semaglutide, a widely used medication for obesity and type 2 diabetes. Published in the journal Cell Metabolism, the research offers new hope for improving obesity treatments while minimizing side effects.
Targeting the Brain’s Weight Loss Circuit
Semaglutide belongs to a class of drugs known as GLP-1R agonists. These medications have proven effective in reducing appetite and promoting weight loss, but they can also cause unwanted side effects such as nausea and muscle loss.
To unravel how semaglutide works in the brain, researchers conducted experiments on mice. They mapped which nerve cells were activated by the drug and then directly stimulated these cells—without administering semaglutide itself. The mice showed reduced food intake and lost weight, mirroring the effects of the drug. When these nerve cells were destroyed, semaglutide’s impact on appetite and fat loss was significantly blunted, while side effects like nausea and muscle loss persisted.
“This suggests that these nerve cells control the beneficial effects of semaglutide,” explained Júlia Teixidor-Deulofeu, the study’s first author and a Ph.D. student at the Sahlgrenska Academy. “If we can target the treatment to these cells, we may be able to maintain the positive effects while reducing side effects.”
The Dorsal Vagal Complex: A Key Brain Area
The nerve cells identified are located in the dorsal vagal complex, a region of the brainstem crucial for regulating energy balance. This discovery not only paves the way for potentially safer and more effective obesity treatments but also deepens scientific understanding of how the brain controls appetite and metabolism.
“With semaglutide and other GLP-1R agonists being prescribed to more people—and investigated for conditions like substance use disorders and neurodegenerative diseases—it’s vital to understand how these drugs work,” said researcher Linda Engström Ruud, supervisor to the study’s Ph.D. students. “The better we understand the mechanisms, the more we can improve these therapies.”
Looking Ahead
The findings could lead to the development of new drugs that target only the nerve cells responsible for weight loss, potentially reducing common side effects. As obesity rates continue to rise globally, such advances are crucial for public health.
Disclaimer:
This article summarizes findings from a preclinical study conducted on mice. While the results are promising, further research and clinical trials in humans are necessary before these findings can be translated into new treatments. Always consult a healthcare professional for medical advice or before making changes to your medication or treatment plan.
Source: Medical Xpress, University of Gothenburg, Cell Metabolism (2025).
