A groundbreaking study published in Cell Metabolism demonstrates how the hormone FGF21 (fibroblast growth factor 21) can reverse fatty liver disease in mice by signaling the brain to improve liver function. Led by Dr. Matthew Potthoff of the University of Oklahoma, the research sheds light on the hormone’s mechanism of action, offering hope for new treatments currently in Phase 3 clinical trials.
Fatty liver disease, also known as MASLD (metabolic dysfunction-associated steatotic liver disease), affects 40% of people worldwide and can progress to severe liver damage, including fibrosis and cirrhosis. Currently, only one FDA-approved treatment exists for its advanced stage, MASH (metabolic dysfunction-associated steatohepatitis). The study reveals that FGF21 works through a dual signaling pathway: it primarily communicates with the brain, which then adjusts nerve activity to reduce liver fat and reverse fibrosis, while also sending a direct signal to the liver to lower cholesterol.
Dr. Potthoff explained, “It’s a feedback loop where the hormone sends a signal to the brain, and the brain changes nerve activity to the liver to protect it.” This dual action makes FGF21 particularly effective, even in mice consuming a disease-inducing diet.
Similar to GLP-1 weight loss drugs, FGF21 is produced in peripheral tissues (the liver) and acts on the brain to regulate metabolism. However, FGF21 stands out for its ability to not only reduce fat but also reverse fibrosis, addressing the most damaging aspect of the disease.
“FGF21 is quite powerful because it not only leads to a reduction of fat but also mediates the reversal of fibrosis,” said Dr. Potthoff. “Now, we not only understand how the hormone works, but it may guide us in creating even more targeted therapies in the future.”
The study’s findings provide critical insights into FGF21’s role in combating fatty liver disease, paving the way for innovative treatments. As Phase 3 trials progress, this research could lead to therapies that target the brain-liver signaling pathway, offering new hope for millions affected by this growing health crisis.
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