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In a recent study published in the journal Nature, researchers from Columbia University Medical Center and the La Jolla Institute for Allergy and Immunology reveal that brain proteins linked to Parkinson's disease trigger an autoimmune response by activating immune cells called T cells.
Parkinson’s disease gradually impairs the brain’s production of dopamine, leading to difficulties in controlling muscle movements and resulting in symptoms like tremors, shaking, and rigidity. The study proposes that damaged alpha-synuclein proteins deceive T cells into attacking dopamine-producing neurons as if they were foreign invaders. "The theory of an immune system malfunction contributing to Parkinson’s dates back nearly a century," says study co-leader David Sulzer of Columbia Medical Center in a press statement. "But this is the first time we’ve been able to make the connection. Our results show that two fragments of alpha-synuclein can activate T cells involved in autoimmune responses in Parkinson's disease."
The study analyzed blood samples from 67 Parkinson’s patients and 36 healthy individuals, evaluating immune responses to various protein fragments, including alpha-synuclein. While control group samples showed no immune response, those from Parkinson’s patients exhibited an exaggerated T cell response to the protein fragments. This autoimmune reaction may stem from the brain's diminished ability to clear damaged alpha-synuclein proteins, prompting the body to view their accumulation as an attack from a pathogen.
These discoveries pave the way for new Parkinson’s treatments. Immunotherapy that alters the body’s response to alpha-synuclein could potentially alleviate symptoms.
