Apr. 22, 2013 The earliest signs of Parkinson's disease can be deceptively mild. The first thing that movie star Michael J. Fox noticed was twitching of the little finger of his left hand. For years, he made light of the apparently harmless tic. But such tremors typically spread, while muscles stiffen up and directed movements take longer to carry out. Research groups led by Armin Giese of LMU Munich and Christian Griesinger at the Max Planck Institute for Biophysical Chemistry in Gttingen have developed a chemical compound that slows down the onset and progression of Parkinson's disease in mice. The scientists hope that this approach will give them a way to treat the cause of Parkinson's and so arrest its progress. The disease usually becomes manifest between the ages of 50 and 60, and results from the loss of dopamine-producing nerve cells in the substantia nigra, which is part of the midbrain. Under the microscope, the affected cells are seen to contain insoluble precipitates made up of a protein called alpha-synuclein. As an early step in the pathological cascade, this protein forms so-called oligomers, tiny aggregates consisting of small numbers of alpha-synuclein molecules, which are apparently highly neurotoxic. By the … Continue reading
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