Scientists have identified a surprising cellular mechanism that may determine why multiple sclerosis (MS) worsens quickly in some patients. In brain tissue from individuals with severe MS, the team found abundant immune cells engorged with fat droplets, a state that appears to accelerate neurological damage.
The findings focus on “foamy” cells that form after they absorb broken-down myelin, the protective coating around nerve fibers. Rather than aiding brain repair, these lipid-laden cells appear to switch roles, actively fueling harmful inflammation that exacerbates the disease.
Researchers observed a stark correlation between the presence of these foamy cells and disease severity in the tissue samples examined. The sheer number of these overloaded immune cells distinguished severe cases from milder ones, offering a new window into MS pathology.
If these results hold in broader studies, it could reshape understanding of MS progression and open novel therapeutic avenues. Targeting fat metabolism in these immune cells might help slow or halt neurodegeneration for the millions living with the condition.
“This changes how we think about the immune system’s role in MS,” the authors noted, though they caution that findings are based on tissue samples and require validation in living patients.