Alpha-synuclein blocks ER-Golgi traffic and Rab1 rescues neuron loss in Parkinson's models |
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| Authors: | Cooper Antony A Gitler Aaron D Cashikar Anil Haynes Cole M Hill Kathryn J Bhullar Bhupinder Liu Kangning Xu Kexiang Strathearn Katherine E Liu Fang Cao Songsong Caldwell Kim A Caldwell Guy A Marsischky Gerald Kolodner Richard D Labaer Joshua Rochet Jean-Christophe Bonini Nancy M Lindquist Susan |
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| Institution: | School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA. |
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| Abstract: | Alpha-synuclein (alphaSyn) misfolding is associated with several devastating neurodegenerative disorders, including Parkinson's disease (PD). In yeast cells and in neurons alphaSyn accumulation is cytotoxic, but little is known about its normal function or pathobiology. The earliest defect following alphaSyn expression in yeast was a block in endoplasmic reticulum (ER)-to-Golgi vesicular trafficking. In a genomewide screen, the largest class of toxicity modifiers were proteins functioning at this same step, including the Rab guanosine triphosphatase Ypt1p, which associated with cytoplasmic alphaSyn inclusions. Elevated expression of Rab1, the mammalian YPT1 homolog, protected against alphaSyn-induced dopaminergic neuron loss in animal models of PD. Thus, synucleinopathies may result from disruptions in basic cellular functions that interface with the unique biology of particular neurons to make them especially vulnerable. |
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