Alpha-synuclein fibrils may need inflammation to form Lewy bodies

A recent study using human stem cells found that both misfolded alpha-synuclein protein and an inflammatory signal are necessary to trigger the formation of Lewy bodies, which lead to the death of dopamine-producing neurons in Parkinson's disease. This research supports previous findings that the immune system plays a key role in Parkinson’s development. Lead author Armin Bayati from McGill University explained that inflammation could make neurons more vulnerable to autoimmune attacks. The study showed that exposing neurons to alpha-synuclein fibrils and inflammatory molecules like interferon-gamma (IFN-gamma) led to the formation of Lewy bodies, a hallmark of Parkinson’s. The findings suggest that genetic predisposition may not be required for Parkinson’s, as the environment could be a significant factor. The study also highlighted the role of lysosomes, the cell’s waste disposal system, in this process. Immune stress reduced levels of proteins essential for lysosomal function, contributing to the buildup of Lewy bodies. This dual hit—misfolded proteins and immune-triggered lysosomal dysfunction—appears to be a key driver in the development of Parkinson’s.