Improving cell replacement therapy for Parkinson's disease
Parkinson's disease is a neurodegenerative disease that affects dopamine signaling neurons in patients' brains. Cell-replacement therapy shows some promise as a treatment for Parkinson's. A recent paper in the journal Molecular & Cellular Proteomics reports a technical advance in selecting cells to use in this therapy.
Cell-replacement therapy involves differentiating stem cells into dopamine-signaling, or dopaminergic, neurons and transplanting them into a patient's brain to replace dying neurons. However, the variability of differentiated cells — including contamination with other neuronal cell types or residual undifferentiated stem cells — can affect transplantation outcomes.
In clinical trials in the 1990s, for example, such contamination gave some patients severe dyskinesia, uncontrollable jerky movements that were worse than the movement problems caused by Parkinson's disease.
To avoid interference by unwanted cell types, researchers need a differentiation protocol that yields a more homogeneous population of dopaminergic neurons. Researchers led by Hossein Baharvand, of Iran's University of Science and Culture in Tehran, and Ghasem Hosseini Salekdeh , of the Academic Center for Education, Culture and Research in Iran and Macquarie University in Australia, set out to develop such a protocol.
First, the team developed a special stem cell line that contains a green fluorescent protein, or GFP, reporter for a transcription factor involved in dopaminergic neuronal development. In undifferentiated cells from this line, the fluorescent reporter is not expressed. When cells begin to make the transcription factor, the first step toward becoming a dopaminergic neuron, they also begin to make the GFP protein.
The team then used standard protocols to differentiate the cells and sorted them by GFP expression. They then identified proteins that were enriched on the surface of partially differentiated cells called dopaminergic progenitors. By selecting for one protein characteristic of dopaminergic progenitors, called contactin 2, they isolated progenitors and transplanted them into rats modeling Parkinson's disease.
Rats that received transplants with contactin 2-enriched cells had better dopamine release, indicating that the transplanted cells were a better match for the dying neurons they were meant to replace. Sorting the cells also reduced motor symptoms of Parkinson's compared with rats treated that received unsorted cells.
The team's isolation procedure uses may be an important step toward more successful cell-replacement therapy.
###
DOI: 10.1074/mcp.RA118.000809
About Molecular & Cellular Proteomics
Molecular & Cellular Proteomics (MCP) showcases research into proteomes, large-scale sets of proteins from different organisms or biological contexts. The journal publishes work that describes the structural and functional properties of proteins and their expression, particularly with respect to developmental time courses. Emphasis is placed on determining how the presence or absence of proteins affect biological responses, and how the interaction of proteins with their cellular partners influences their functions. For more information about MCP, visit http://www.
About the American Society for Biochemistry & Molecular Biology
The ASBMB is a nonprofit scientific and educational organization with more than 11,000 members worldwide. Most members teach and conduct research at colleges and universities. Others conduct research in government laboratories, at nonprofit research institutions and in industry. The Society publishes three journals: the Journal of Biological Chemistry, the Journal of Lipid Research, and Molecular and Cellular Proteomics. For more information about ASBMB, visit http://www.
Media Contact
More Information:
http://dx.doi.org/10.1074/mcp.RA118.000809All latest news from the category: Life Sciences and Chemistry
Articles and reports from the Life Sciences and chemistry area deal with applied and basic research into modern biology, chemistry and human medicine.
Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.
Newest articles
Detector for continuously monitoring toxic gases
The material could be made as a thin coating to analyze air quality in industrial or home settings over time. Most systems used to detect toxic gases in industrial or…
On the way for an active agent against hepatitis E
In order to infect an organ, viruses need the help of the host cells. “An effective approach is therefore to identify targets in the host that can be manipulated by…
A second chance for new antibiotic agent
Significant attempts 20 years ago… The study focused on the protein peptide deformylase (PDF). Involved in protein maturation processes in cells, PDF is essential for the survival of bacteria. However,…