Tests have been performed on mice with MS-like conditions. Stem cells injected into the mice, though fiercely rejected by the immune systems of the subjects, lessened inflammation and repaired some of the myelin sheaths around nerve cells, whose destruction plays a key role in MS. The most positive results came from a study involving the injection of mesenchymal cells (multipotent stromal cells derived from human stem cells). These cells were able to cross the blood- brain barrier and both repair damaged cells and prevent further damage from occurring in the future.
Sources: http://www.usatoday.com/story/news/nation/2014/06/05/stem-cells-multiple-sclerosis/9924469/
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