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Saturday, April 19, 2014

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Stem cells restore cognitive abilities impaired by brain tumor treatment, UCI study finds

Transplantation alleviates side effects of radiotherapy in rats

— Irvine, Calif., November 9, 2009 —

Human embryonic stem cells could help people with learning and memory deficits after radiation treatment for brain tumors, suggests a new UC Irvine study.

Research with rats found that transplanted stem cells restored learning and memory to normal levels four months after radiotherapy. In contrast, irradiated rats that didn't receive stem cells experienced a more than 50 percent drop in cognitive function.

"Our findings provide the first evidence that such cells can be used to ameliorate radiation-induced damage of healthy tissue in the brain," said Charles Limoli, UCI radiation oncology associate professor and senior author of the study, appearing online the week of Nov. 9 in the Proceedings of the National Academy of Sciences.

Radiotherapy for brain tumors is limited by how well the surrounding tissue tolerates the treatment. In receiving radiation at levels needed to treat tumors, patients suffer varying degrees of learning and memory impairment that can affect their quality of life.

"It's a progressive, debilitating side effect of cranial irradiation," Limoli said. "Any treatments showing promise at reversing this are worthy of pursuit."

In the UCI study, stem cells were transplanted into the heads of rats that had undergone radiation treatment. They migrated to a brain region known to support the growth of neurons, scientists observed, and developed into new brain cells.

Work is under way to determine how the transplanted stem cells improved cognition: Did they integrate into healthy tissue or did they help repair and support existing brain cells?

Said Limoli: "With further research, stem cells may one day be used to manage a variety of adverse conditions associated with radiotherapy."

In addition to Limoli, UCI scientists Munjal Acharya, Lori-Ann Christie, Mary Lan, Peter Donovan and Carl Cotman worked on this study, in collaboration with John Fike of UC San Francisco. The UCI researchers are from the departments of radiation oncology, biological chemistry, and developmental & cell biology; the Institute for Memory Impairments and Neurological Disorders, or UCI MIND; and the Sue & Bill Gross Stem Cell Research Center.

The study was supported by grants from the California Institute for Regenerative Medicine and the National Institutes of Health.

About the University of California, Irvine: Founded in 1965, UCI is a top-ranked university dedicated to research, scholarship and community service. Led by Chancellor Michael Drake since 2005, UCI is among the fastest-growing University of California campuses, with more than 27,000 undergraduate and graduate students, 1,100 faculty and 9,200 staff. The top employer in dynamic Orange County, UCI contributes an annual economic impact of $4.2 billion. For more UCI news, visit www.today.uci.edu.

News Radio: UCI maintains on campus an ISDN line for conducting interviews with its faculty and experts. Use of this line is available for a fee to radio news programs/stations that wish to interview UCI faculty and experts. Use of the ISDN line is subject to availability and approval by the university.

Charles Limoli
Charles Limoli and colleagues found that human embryonic stem cells can alleviate the side effects of brain tumor radiation in rats.
Photo by Steve Zylius / University Communications

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