title: [Phenotype-based primary screening for drugs promoting neuronal subtype differentiation in embryonic stem cells with light microscope].
abstract: OBJECTIVE
  To set up a platform for phenotype-based primary screening of drug candidates promoting neuronal subtype differentiation in embryonic stem cells (ES) with light microscope.
  
  
  METHODS
  Hanging drop culture 4-/4+ method was employed to harvest the cells around embryoid body (EB) at differentiation endpoint. Morphological evaluation for neuron-like cells was performed with light microscope. Axons for more than three times of the length of the cell body were considered as neuron-like cells. The compound(s) that promote neuron-like cells was further evaluated. Icariin (ICA, 10(-6)mol/L) and Isobavachin (IBA, 10(-7)mol/L) were selected to screen the differentiation-promoting activity on ES cells. Immunofluorescence staining with specific antibodies (ChAT, GABA) was used to evaluate the neuron subtypes.
  
  
  RESULTS
  The cells treated with IBA showed neuron-like phenotype, but the cells treated with ICA did not exhibit the morphological changes. ES cells treated with IBA was further confirmed to be cholinergic and GABAergic neurons.
  
  
  CONCLUSIONS
  Phenotypic screening with light microscope for molecules promoting neuronal differentiation is an effective method with advantages of less labor and material consuming and time saving, and false-positive results derived from immunofluorescence can be avoided. The method confirms that IBA is able to facilitate ES cells differentiating into neuronal cells, including cholinergic neurons and GABAergic neurons.
authors.affiliation: Institute of Pharmacology, Toxicology, and Biochemical Pharmaceutics, Zhejiang University, Hangzhou 310058, China.
authors.forename: Yi-ning
authors.initials: YN
authors.lastname: Gao
authors.forename: Dan-ying
authors.initials: DY
authors.lastname: Wang
authors.forename: Zong-fu
authors.initials: ZF
authors.lastname: Pan
authors.forename: Yu-qin
authors.initials: YQ
authors.lastname: Mei
authors.forename: Zhi-qiang
authors.initials: ZQ
authors.lastname: Wang
authors.forename: Dan-yan
authors.initials: DY
authors.lastname: Zhu
authors.forename: Yi-jia
authors.initials: YJ
authors.lastname: Lou
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects* / Q000502:physiology; D002460:Cell Line; D004353:Drug Evaluation, Preclinical / Q000379:methods*; D058732:Embryoid Bodies / Q000166:cytology; D053595:Embryonic Stem Cells / Q000166:cytology*; D051379:Mice; D009416:Nerve Regeneration / Q000187:drug effects; D009474:Neurons / Q000166:cytology*; D010641:Phenotype