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Stem cell hope for Parkinson's disease

10 January 2005
By BioNews
Appeared in BioNews 290

A Japanese team of researchers has used embryonic stem cells to successfully repair the brain damage caused by Parkinson's disease in monkeys. The team, based at Kyoto University, used monkey embryo stem cells to produce nerve cells, which they transplanted into the brains of monkeys affected by a primate model of the disease. The treatment reduced the symptoms of the disease, raising hopes for a new therapy for human patients. However, the scientists, who published their findings in the Journal of Clinical Investigation, stress that further research into the long-term safety and effectiveness of the technique is needed before human trials can be considered.

People with Parkinson's disease are affected by tremors, stiff muscles and slow movements, caused by a gradual loss of dopamine-producing nerve cells in an area of the brain controlling movement. Researchers are hoping to develop new treatments for the illness, based on replacing these lost cells. One possible source of new brain cells is to use embryonic stem cells, which have the potential to grow into any type of body cell.

The Japanese scientists used stem cells taken from early monkey embryos, and grew them into dopamine-producing brain cells in the laboratory. They then transplanted the cells into monkeys who had Parkinson's disease-like brain damage, caused by a chemical called MPTP. The cells began to work correctly, and improved the monkeys' symptoms - particularly their posture and movement.

In a commentary accompanying the study, J William Langston of the Parkinson's Institute in California called the findings 'encouraging', but cautioned that 'the number of surviving dopamine-producing neurons was very low'. He added that 'it is good news that tumours were not observed, but this could also be related to the small number of surviving cells'. Only one to three per cent of the transplanted cells survived, compared to the estimated ten per cent that survive after fetal cell transplants. But Langston concluded that the study 'will advance research aimed at validating the use of stem cells to treat neurodegenerative disease'.

Embryonic Stem Cells Reverse Parkinson's in Monkeys
Betterhumans |  3 January 2005
Parkinson's damage repaired
BBC News Online |  3 January 2005
Transplantation of monkey embryonic stem cells reverses Parkinson disease in primates
EurekaAlert |  3 January 2005
10 March 2006 - by BioNews 
US researchers are set to test a fetal nerve stem cell treatment for Batten disease, a rare and currently incurable genetic brain disorder. Oregon Health and Science University (OHSU) says the trial aims to test the safety of the approach, since transplants of purified nerve stem cells have never been...
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The latest results from a trial in which five Huntington's disease (HD) patients received fetal nerve tissue transplants show that the treatment can slow, but not stop the progression of the condition. The study, carried out at the Henri Mondor Hospital in France, shows that for some patients, cell transplants...
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A team of Italian and Scottish researchers has managed to grow pure batches of human nerve stem cells in the laboratory, using embryonic stem (ES) cells. Previous nerve stem cell lines grown in this way are actually a mixture of ES cells and nerve stem cells, which limits their usefulness...
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Scientists at the Memorial Sloan-Kettering Cancer Center in New York have successfully used 'therapeutic cloning' to treat mice with the symptoms of Parkinson's disease. The research, which is published in the journal Nature Biotechnology, showed that cells from cloned mouse embryos could alleviate the symptoms of the brain disorder. Team...
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