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a McLean Hospital/Harvard University Udall Parkinson’s Disease Research Center of Excellence and
b Neuroregeneration Laboratories, McLean Hospital, Belmont, Massachusetts, USA;
c Laboratory of Stem Cell & Tumor Biology, Division of Neurosurgery, Memorial Sloan-Kettering Cancer Center, New York, New York, USA
Key Words. Parkinson’s disease • Embryonic stem (ES) cell • Transplantation • Primate • Differentiation
Correspondence: Rosario Sánchez-Pernaute, M.D., Ph.D., McLean Hospital/Harvard University Udall Parkinson’s Disease Research Center of Excellence and Neuroregeneration Laboratories, McLean Hospital, 115 Mill St., Belmont, Massachusetts 02478, USA. Telephone: 617-855-3568 ; Fax: 617-855-2522; e-mail: rosario_pernaute{at}hms.harvard.edu
Dopamine (DA) neurons can be derived from human and primate embryonic stem (ES) cells in vitro. An ES cell–based replacement therapy for patients with Parkinson’s disease requires that in vitro–generated neurons maintain their phenotype in vivo. Other critical issues relate to their proliferative capacity and risk of tumor formation, and the capability of migration and integration in the adult mammalian brain. Neural induction was achieved by coculture of primate parthenogenetic ES cells (Cyno-1) with stromal cells, followed by sequential exposure to midbrain patterning and differentiation factors to favor DA phenotypic specification. Differentiated ES cells were treated with mitomycin C and transplanted into adult immunosuppressed rodents and into a primate (allograft) with out immunosuppression. A small percentage of DA neurons survived in both rodent and primate hosts for the entire term of the study (4 and 7 months, respectively). Other neuronal and glial populations derived from Cyno-1 ES cells showed, in vivo, phenotypic characteristics and growth and migration patterns similar to fetal primate transplants, and a majority of cells (>80%) expressed the forebrain transcription factor brain factor 1. No teratoma formation was observed. In this study, we demonstrate long-term survival of DA neurons obtained in vitro from primate ES cells. Optimization of differentiation, cell selection, and cell transfer is required for functional studies of ES-derived DA neurons for future therapeutic applications.
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