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Production of dopaminergic neurons from stem/precursor cells for transplantation in Parkinson's disease has become a major focus of research. However, the inductive signals mediating this process have not been clarified. Reported data on the effects of Sonic hedgehog on differentiation of dopaminergic and serotonergic neurons from cultures of neural precursors are controversial. In the present study, cultures of proliferating neurospheres of mesencephalic precursors treated with anti–sonic hedgehog antibodies showed significantly less serotonergic and GABAergic cells and a markedly higher number of dopaminergic neurons generated from the neurospheres than control cultures. Treatment of the neurospheres with cyclopamine, which selectively inhibits sonic hedgehog signaling by preventing Smoothened activation, did not induce significant changes in generation of serotonergic and dopaminergic neurons. This suggests that Smoothened activation is not significantly involved in the above‐mentioned effects and that sonic hedgehog may exert effects on the mesencephalic precursors that do not involve the canonical Patched‐Smoothened‐Gli signaling. Developmental Dynamics 237:909–917, 2008. © 2008 Wiley‐Liss, Inc.
Developmental Dynamics – Wiley
Published: Apr 1, 2008
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