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Monday, January 11, 2016

Researchers describe three cleaning procedures that effectively remove, disassemble α-Syn fibrils

Published on January 11, 2016 at 8:40 AM 




Lewy bodies and Lewy neurites are found in the brains of Parkinson's disease (PD) patients. They consist primarily of fibrils of the protein alpha-synuclein (α-Syn), which self-assembles into fibrils in vitro. If introduced into the human body, these seeds can act as prions and trigger the formation of toxic protein deposits. Because α-Syn fibrils are often used in research, it is important that they are not accidentally transferred to humans or cell cultures. Researchers reporting in the Journal of Parkinson's Disease describe three cleaning procedures that effectively remove and disassemble these α-synuclein seeds.
α-Syn is purified and assembled in test tubes into fibrils that are used to investigate/mimic PD pathogenesis in model animals ranging from worms (c. elegans) to rodents and non-human primates in a large number of laboratories. These laboratories typically contain surfaces and non-disposable items made from plastic, glass, aluminum, or stainless steel. These items are often rough, with areas that cannot be completely cleaned by wiping. Therefore, it is important to minimize contamination through effective cleaning procedures.
"Several teams, including ours, demonstrated that fibrillar α-Syn propagate from one cell, including neurons, to another and amplify during this propagation process mimicking prion particle behavior. These observations suggest that fibrillar α-Syn is not innocuous," explained lead investigator Ronald Melki, PhD, Director of Research at the Paris-Saclay Institute of Neurosciences, CNRS, Gif-sur-Yvette, France.
Researchers applied a solution of fluorescently-labeled fibrils and ribbons of α-Syn to roughened surfaces mimicking laboratory conditions. The droplets were easily visible to the eye and could be assessed by their fluorescence.
Five cleaning solutions were tested: 1) sodium hypochlorite (20,000 ppm); 2) sodium hydroxide (1N), 3) sodium dodecyl sulfate (SDS, 1%, W/V); 4) Hellmanex (1%, V/V); and 5) TFD4 (1%, V/V). As a control, the surfaces were washed with just commercially prepared pure water. After cleaning, the amount of small assemblies, fibrils, and ribbons of α-Syn remaining on the surfaces was measured by fluorescence. To evaluate whether the α-Syn fibrils that were washed off the surfaces were destroyed, fibrils and ribbons were incubated in the various cleaning solutions for one hour and the amount of remaining fibrils was measured.

Lewy bodies and Lewy neurites are found in the brains of Parkinson's disease (PD) patients. They consist primarily of fibrils of the protein alpha-synuclein (α-Syn), which self-assembles into fibrils in vitro. If introduced into the human body, these seeds can act as prions and trigger the formation of toxic protein deposits. Because α-Syn fibrils are often used in research, it is important that they are not accidentally transferred to humans or cell cultures. Researchers reporting in the Journal of Parkinson's Disease describe three cleaning procedures that effectively remove and disassemble these α-synuclein seeds.
α-Syn is purified and assembled in test tubes into fibrils that are used to investigate/mimic PD pathogenesis in model animals ranging from worms (c. elegans) to rodents and non-human primates in a large number of laboratories. These laboratories typically contain surfaces and non-disposable items made from plastic, glass, aluminum, or stainless steel. These items are often rough, with areas that cannot be completely cleaned by wiping. Therefore, it is important to minimize contamination through effective cleaning procedures.
"Several teams, including ours, demonstrated that fibrillar α-Syn propagate from one cell, including neurons, to another and amplify during this propagation process mimicking prion particle behavior. These observations suggest that fibrillar α-Syn is not innocuous," explained lead investigator Ronald Melki, PhD, Director of Research at the Paris-Saclay Institute of Neurosciences, CNRS, Gif-sur-Yvette, France.
Researchers applied a solution of fluorescently-labeled fibrils and ribbons of α-Syn to roughened surfaces mimicking laboratory conditions. The droplets were easily visible to the eye and could be assessed by their fluorescence.
Five cleaning solutions were tested: 1) sodium hypochlorite (20,000 ppm); 2) sodium hydroxide (1N), 3) sodium dodecyl sulfate (SDS, 1%, W/V); 4) Hellmanex (1%, V/V); and 5) TFD4 (1%, V/V). As a control, the surfaces were washed with just commercially prepared pure water. After cleaning, the amount of small assemblies, fibrils, and ribbons of α-Syn remaining on the surfaces was measured by fluorescence. To evaluate whether the α-Syn fibrils that were washed off the surfaces were destroyed, fibrils and ribbons were incubated in the various cleaning solutions for one hour and the amount of remaining fibrils was measured.
http://www.news-medical.net/news/20160111/Researchers-describe-three-cleaning-procedures-that-effectively-remove-disassemble-ceb1-Syn-fibrils.aspx

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