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Transplantation Of Monkey Embryonic Stem Cells Reverses Parkinson Disease In Primates

The replenishment of missing neurons in the brain as a treatment for Parkinson disease reached the stage of human trials over 15 years ago, however the field is still in its infancy. Researchers from Kyoto University have now shown that dopamine-producing neurons (DA neurons) generated from monkey embryonic stem cells and transplanted into areas of the brain where these neurons have degenerated in a monkey model of Parkinson disease, can reverse parkinsonism. Their results appear in the January 3 issue of the Journal of Clinical Investigation.

Studies of animal models of Parkinson disease as well as clinical investigations, have shown that transplantation of fetal DA neurons can relieve the symptoms this disease. However the technical and ethical difficulties in obtaining sufficient and appropriate donor fetal brain tissue have limited the application of this therapy. These researchers previously demonstrated that mouse embryonic stem cells can differentiate into neurons when cultured under specific conditions. These same culture conditions, technically simple and efficient, were recently applied to primate embryonic stem cells and resulted in the generation of large numbers of DA neurons. In their current JCI study, Jun Takahashi and colleagues generated neurons from monkey embryonic stem cells and exposed these cells to FGF20, a growth factor that is produced exclusively in the area of the brain affected by Parkinson disease and is reported to have a protective effect on DA neurons. The authors observed increased DA neuron development and subsequently transplanted these neurons into monkeys treated with an agent called MPTP, which is considered a primate model for Parkinson disease. These transplanted cells were able to function as DA neurons and diminished Parkinsonian symptoms. In an accompanying commentary, J. William Langston from the Parkinson's Institute, California, describes this study as a milestone in the development of stem cell technology but ca
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Source:ScienceDaily


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