title: A well-refined in vitro model derived from human embryonic stem cell for screening phytochemicals with midbrain dopaminergic differentiation-boosting potential for improving Parkinson's disease.
abstract: Stimulation of endogenous neurogenesis is a potential approach to compensate for loss of dopaminergic neurons of substantia nigra compacta nigra (SNpc) in patients with Parkinson's disease (PD). This objective was to establish an in vitro model by differentiating pluripotent human embryonic stem cells (hESCs) into midbrain dopaminergic (mDA) neurons for screening phytochemicals with mDA neurogenesis-boosting potentials. Consequently, a five-stage differentiation process was developed. The derived cells expressed many mDA markers including tyrosine hydroxylase (TH), β-III tubulin, and dopamine transporter (DAT). The voltage-gated ion channels and dopamine release were also examined for verifying neuron function, and the dopamine receptor agonists bromocriptine and 7-hydroxy-2-(dipropylamino)tetralin (7-OH-DPAT) were used to validate our model. Then, several potential phytochemicals including green tea catechins and ginsenosides were tested using the model. Finally, ginsenoside Rb1 was identified as the most potent phytochemical which is capable of upregulating neurotrophin expression and inducing mDA differentiation.
authors.affiliation: Institute of Food Science and Technology, National Taiwan University , No. 1, Roosevelt Road, Section 4, Taipei, Taiwan ROC.
authors.forename: Wen-Ting
authors.initials: WT
authors.lastname: Hsieh
authors.forename: Been-Huang
authors.initials: BH
authors.lastname: Chiang
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects; D004298:Dopamine / Q000378:metabolism*; D053595:Embryonic Stem Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism*; D006801:Humans; D066298:In Vitro Techniques; D008636:Mesencephalon / Q000378:metabolism; D009474:Neurons / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D010300:Parkinson Disease / Q000235:genetics / Q000378:metabolism / Q000628:therapy*; D064209:Phytochemicals / Q000494:pharmacology*
chemical_list: D064209:Phytochemicals; D004298:Dopamine