Stem cells that come from a specific part of the developing brain help fuel the growth of brain tumors caused by an inherited condition, researchers at Washington University School of Medicine in St. Louis report.
Scientists showed in mice that disabling a gene linked to a common pediatric tumor disorder, neurofibromatosis type 1 (NF1), made stem cells from one part of the brain proliferate rapidly. But the same genetic deficit had no effect on stem cells from another brain region.
The results can be explained by differences in the way stem cells from these regions of the brain respond to cancer-causing genetic changes.
NF1 is among the world's most common genetic disorders, occurring in about one of every 3,000 births. It causes a wide range of symptoms, including brain tumors, learning disabilities and attention deficits.
Brain tumors in children with NF1 typically arise in the optic nerve and do not necessarily require treatment. If optic gliomas keep growing, though, they can threaten the child's vision. By learning more about the many factors that contribute to NF1 tumor formation, scientists hope to develop more effective treatments.
"To improve therapy, we need to develop better ways to identify and group tumors based not just on the way they look under the microscope, but also on innate properties of their stem cell progenitors," says David H. Gutmann, MD, PhD, the Donald O. Schnuck Family Professor of Neurology.
The study appears July 9 in Cancer Cell. Gutmann also is the director of the Washington University Neurofibromatosis Center.
In the new study, researchers compared brain stem cells from two primary sources: the third ventricle, located in the midbrain, and the nearby lateral ventricles. Before birth and for a time afterward, both of these areas in the brain are lined with growing stem cells.
First author Da Yong Lee, PhD, a postdoctoral research associate, showed
|Contact: Michael C. Purdy|
Washington University School of Medicine