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a Departments of Anatomy,
b Neurology, and
c Anesthesiology,
d The Waisman Center,
e Wisconsin Primate Research Center, and
f WiCell Research Institute, University of Wisconsin-Madison, Madison, Wisconsin, USA
Key Words. Neuroepithelial cells • Neural differentiation • Cell replacement • Parkinson’s disease
Correspondence: Su-Chun Zhang, M.D., Ph.D., Waisman Center, Room T613, University of Wisconsin, 1500 Highland Avenue, Madison, Wisconsin 53705, USA. Telephone: 608-265-2543; Fax: 608-263-5267; e-mail: zhang{at}waisman.wisc.edu
How dopamine (DA) neuronal subtypes are specified remains unknown. In this study we show a robust generation of functional DA neurons from human embryonic stem cells (hESCs) through a specific sequence of application of fibroblast growth factor 8 (FGF8) and sonic hedgehog (SHH). Treatment of hESC-derived Sox1+neuroepithelial cells with FGF8 and SHH resulted in production of tyrosine hydroxylase (TH)–positive neurons that were mostly bipolar cells, coexpression with
-aminobutyric acid, and lack of midbrain marker engrailed 1 (En1) expression. However, FGF8 treatment of precursor cells before Sox1 expression led to the generation of a similar proportion of TH+ neurons characteristic of midbrain projection DA neurons with large cell bodies and complex processes and coexpression of En1. This suggests that one mechanism of generating neuronal subtypes is temporal availability of morphogens to a specific group of precursors. The in vitro–generated DA neurons were electrophysiologically active and released DA in an activity-dependent manner. They may thus provide a renewable source of functional human DA neurons for drug screening and development of sustainable therapeutics for disorders affecting the DA system.
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