Researchers at Keio University in Tokyo announced at a symposium that they had achieved the first confirmed case in which movement in paralyzed mice's limbs was restored by transplanting neural stem cells grown from human iPS cells, or induced pluripotent stem cells, Kyodo news service reported Wednesday.

''It is valuable that treatment using human iPS cells has proved effective, said physiology Professor Hideyuki Okano, who led the research team. "We want to apply (the results) in a clinical setting as soon as possible.''

To this point, there is no effective treatment for people who suffer paralysis when their spinal cords sustain nerve damage in traffic or sports accidents.

The Japanese researchers generated neural stem cells, which will grow into nerve cells, from human iPS cells produced under a method developed by Shinya Yamanaka of Kyoto University. They then transplanted about a half million of the cells into the damaged spines of 40 mice, Okano said.

All 29 mice that survived were able to walk or run again about a month later. The other 11 mice died of diseases not related to the experiment.

The research team will dissect the mice later to check whether the nerve tissues were regenerated in the damaged organs.

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