GRAND RAPIDS – Researchers from South Korea, Sweden, and the United States have collaborated on a project to restore neuron function to parts of the brain damaged by Huntington’s Disease, a genetic disorder that affects muscle coordination and leads to cognitive decline and psychiatric problems.
Induced pluripotent stem cells can be genetically engineered from human cells, such as skin. They can be used to model numerous human diseases, and they may also serve as sources of transplantable cells that can be used in new cell therapies. In the latter case, the patient provides a sample of his or her own skin to the laboratory.
In the current study, experimental animals with damage to a deep brain structure called the striatum (an experimental model of HD) exhibited significant behavioral recovery after receiving transplanted iPS cells. The researchers hope that this approach eventually could be tested in patients for the treatment of HD.
The study, published online this week in Stem Cells, found that transplanted iPS cells initially formed neurons producing GABA, the chief inhibitory neurotransmitter in the mammalian central nervous system, which plays a critical role in regulating neuronal excitability and acts at inhibitory synapses in the brain. GABAergic neurons, located in the striatum, are the cell type most susceptible to degeneration in HD. â€¨
“The unique features of the iPSC approach means that the transplanted cells will be genetically identical to the patient and therefore no medications that dampen the immune system to prevent graft rejection will be needed,” said Jihwan Song, D.Phil. associate professor and director of Laboratory of Developmental & Stem Cell Biology at CHA Stem Cell Institute, CHA University, Seoul, South Korea.
Another key point in the study involves the new disease models for HD presented by this method, allowing researchers to study the underlying disease process in detail. Being able to control disease development from such an early stage, using iPS cells, may provide important clues about the very start of the disease’s development. An animal model that closely imitates the real conditions of HD also opens up new and improved opportunities for drug screening.