Irvine, Calif., April 9, 2014 -- Stem cells culled from bone marrow may prove beneficial in stroke recovery, scientists at UC Irvine's Sue & Bill Gross Stem Cell Research Center have learned.
In an analysis of published research, neurologist Dr. Steven Cramer and biomedical engineer Weian Zhao identified 46 studies that examined the use of mesenchymal stromal cells - a type of multipotent adult stem cells mostly processed from bone marrow - in animal models of stroke. They found MSCs to be significantly better than control therapy in 44 of the studies.
Importantly, the effects of these cells on functional recovery were robust regardless of the dosage, the time the MSCs were administered relative to stroke onset or the method of administration. (The cells helped even if given a month after the event and whether introduced directly into the brain or injected via a blood vessel.)
"Stroke remains a major cause of disability, and we are encouraged that the preclinical evidence shows [MSCs'] efficacy with ischemic stroke," said Cramer, a professor of neurology and leading stroke expert. "MSCs are of particular interest because they come from bone marrow, which is readily available, and are relatively easy to culture. In addition, they already have demonstrated value when used to treat other human diseases."
He noted that MSCs do not differentiate into neural cells. Normally, they transform into a variety of cell types, such as bone, cartilage and fat cells. "But they do their magic as an inducible pharmacy on wheels and as good immune system modulators, not as cells that directly replace lost brain parts," he said.
In an earlier report focused on MSC mechanisms of action, Cramer and Zhao reviewed the means by which MSCs promote brain repair after stroke. The cells are attracted to injury sites and, in response to signals released by these damaged areas, begin releasing a wide range of molecules. In this way, MSCs orchestrate numerous activities: blood vessel creation to enhance circulation, protection of cells starting to die, growth of brain cells, etc. At the same time, when MSCs are able to reach the bloodstream, they settle in parts of the body that control the immune system and foster an environment more conducive to brain repair.
"We conclude that MSCs have consistently improved multiple outcome measures, with very large effect sizes, in a high number of animal studies and, therefore, that these findings should be the foundation of further studies on the use of MSCs in the treatment of ischemic stroke in humans," said Cramer, who is also clinical director of the Sue & Bill Gross Stem Cell Research Center.
The analysis appears in the April 8 issue of Neurology. Quynh Vu, Kate Xie and Mark Eckert of UC Irvine contributed to the project, which received support from UC Irvine's Institute for Clinical & Translational Science through the National Center for Research Resources (grant 5M011 RR-00827-29) and the National Institutes of Health (grants K24HD074722 and R01 NS059909).
About the University of California, Irvine: Located in coastal Orange County, near a thriving employment hub in one of the nation's safest cities, UC Irvine was founded in 1965. One of only 62 members of the Association of American Universities, it's ranked first among U.S. universities under 50 years old by the London-based Times Higher Education. The campus has produced three Nobel laureates and is known for its academic achievement, premier research, innovation and anteater mascot. Led by Chancellor Michael Drake since 2005, UC Irvine has more than 28,000 students and offers 192 degree programs. It's Orange County's second-largest employer, contributing $4.3 billion annually to the local economy.
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