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The Journal of Neuroscience, August 1, 2002, 22(15):6639-6649

The Adult Substantia Nigra Contains Progenitor Cells with Neurogenic Potential

D. Chichung Lie1, Gustavo Dziewczapolski2, Andrew R. Willhoite1, Brian K. Kaspar1, Clifford W. Shults2, and Fred H. Gage1

1 Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California 92037, and 2 Department of Neurosciences, University of California San Diego/Veterans Affairs Medical Center, La Jolla, California 92161

In Parkinson's disease, progressive loss of dopaminergic neurons in the substantia nigra pars compacta (SN) leads to debilitating motor dysfunction. One current therapy aims at exogenous cellular replacement of dopaminergic function by transplanting fetal midbrain cells into the striatum, the main projection area of the SN. However, results using this approach have shown variable success. It has been proposed that cellular replacement by endogenous stem/progenitor cells may be useful for therapeutic interventions in neurodegenerative diseases, including Parkinson's disease. Although it is widely accepted that progenitor cells are present in different areas of the adult CNS, it is unclear whether such cells reside in the adult SN and whether they have the potential to replace degenerating neurons. Here, we describe a population of actively dividing progenitor cells in the adult SN, which in situ give rise to new mature glial cells but not to neurons. However, after removal from the SN, these progenitor cells immediately have the potential to differentiate into neurons. Transplantation of freshly isolated SN progenitor cells into the adult hippocampus showed that these cells also have a neuronal potential under in vivo conditions. These results suggest that progenitor cells reside in the adult SN and can give rise to new neurons when exposed to appropriate environmental signals. This developmental potential of SN progenitor cells might be useful for future endogenous cell replacement strategies in Parkinson's disease.

Key words: Parkinson's disease; neural progenitor cells; cell replacement; gliogenesis; transplantation; substantia nigra

Copyright © 2002 Society for Neuroscience  0270-6474/02/22156639-11$05.00/0


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