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Slashdot: Scientists Find Link Between Parkinson's Disease and the Appendix

Scientists Find Link Between Parkinson's Disease and the Appendix
Published on November 01, 2018 at 09:00AM
An anonymous reader quotes a report from Gizmodo: Scientists have found further evidence that the gut, or more specifically the appendix, might play a role in the development of Parkinson's disease. The international team of scientists reviewed two datasets, including a large registry from Sweden, and found that removal of the appendix was associated with a decreased risk of developing Parkinson's disease. They also found that the human appendix contains clumps of a protein called alpha-synuclein in a form associated with the disease. There's more work to be done, and the authors are not advocating that people preemptively remove their appendixes, but they hope that the research could provide a pathway towards treatment. The study found that of the 1,144,745 Swedes who did not have appendectomies, 1,608 had Parkinson's, but of the 551,003 who had, only 644 had Parkinson's. This is amounts to a 16.9% decrease in the odds of acquiring the disease -- but in absolutes, that's the difference between an 0.14 percent chance of acquiring the disease for those who hadn't gotten their appendix removed versus an 0.11 percent chance for those who had. The effect was also stronger in those living in rural areas, according to the study published today in Science Translational Medicine. The researchers also found that for those who had appendectomies at least 30 years before developing Parkinson's, the procedure was associated with a 3.6-year delay in disease onset. The appendix samples contained alpha-synuclein proteins and shortened and mis-folded alpha-synucleins like the ones found in people with Parkinson's disease. Professor Viviane Labrie from the Cancer of Neurodegenerative Science at the Van Andel Research Institute in Michigan suggests that the alpha-synucleins "can travel up the nerve that connects the G.I. tract to the brain." She added: "If it were to enter the brain, it can seed and spread from there and have neurotoxic effects that could eventually lead to Parkinson's disease."

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