Irisin Cuts MS-Like Symptoms in Mice, Preserving Neurons Across 3 CNS Regions
Updated
Updated · Nature.com · May 21
Irisin Cuts MS-Like Symptoms in Mice, Preserving Neurons Across 3 CNS Regions
4 articles · Updated · Nature.com · May 21
Peripheral irisin delivery raised plasma levels and improved recovery from peak disease in a mouse multiple-sclerosis model, while reducing neuronal loss in the spinal cord, hippocampus and retina.
8 weeks of voluntary running also protected mice, but that benefit disappeared in Fndc5/irisin knockout animals, identifying irisin as a key mediator of exercise-linked neuroprotection.
1,017 neuronal genes changed with irisin treatment, with RNA data pointing to stronger synaptic and mitochondrial programs; microscopy also showed rescued synapses and higher mitochondrial complex IV activity.
Immune profiling found little change in peripheral or central immune responses, suggesting irisin acts mainly through direct neuronal protection rather than broad anti-inflammatory effects.
Because no approved therapy directly halts inflammation-driven neurodegeneration in MS, the mouse findings position irisin as a potential drug target pending further validation.
If exercise naturally produces neuroprotective irisin, should the focus be on accessible fitness programs instead of high-risk gene therapies for MS?
Exercise helps MS by boosting irisin and changing gut microbes. Which pathway offers the better therapeutic target for stopping neurodegeneration?
Irisin protects neurons, but can gene therapy deliver it safely without triggering the immune system it is meant to bypass?
Irisin Identified as Key Neuroprotective Agent in Multiple Sclerosis: 2026 Breakthrough Offers Hope Beyond Inflammation Control
Overview
A groundbreaking study published in May 2026 revealed that irisin, a hormone released during physical exercise, directly protects neurons in mouse models of Multiple Sclerosis (MS). While current MS treatments can reduce inflammation, they have not been able to stop the neurodegeneration that leads to long-term disability. This research fills a major gap by showing that irisin acts directly on neurons, offering a new way to prevent nerve damage. The discovery explains why exercise benefits MS patients and opens the door to developing therapies that target neurodegeneration, not just inflammation.