title: [Programmed application of extracellular matrix promotes neural differentiation of mouse embryonic stem cells].
abstract: OBJECTIVE
  To study the role of extracellular matrix (ECM) in neural differentiation of mouse embryonic stem cells (ESCs).
  
  
  METHODS
  Mouse ESCs were incubated in the ESC conditioned medium, and the formation of embryonic bodies (EBs) were induced in bacteriological dishes using high-concentration all-trans retinoic acid (RA). The EBs were seeded on different matrixes (gelatin, fibronectin, and laminin/poly-L-ornithine) to test their impact on neural differentiation of the ESCs using immunofluorescence assay. The effect of laminin/poly-L-ornithine on the growth of neurites was evaluated with fluorescence microscopy.
  
  
  RESULTS
  High-concentration RA activated and accelerated the differentiation of ESCs toward nestin-positive neural progenitor cells. Fibronectin supplement in the matrix dose-dependently promoted ESC differentiation into neural progenitor cells, while laminin/poly-L-ornithine increased the growth of the neurites and induced the maturation of the differentiated neural cells.
  
  
  CONCLUSIONS
  ECM plays an important role in neural differentiation of mouse ESCs, and application of FN produces the most conspicuous effect during the differentiation of the ESCs into the neural progenitor cells;laminin/poly-L-ornithine is the most effective during their differentiation into neural cells.
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin 150081, China. shanzhiyan@yahoo.com.cn
authors.forename: Zhi-yan
authors.initials: ZY
authors.lastname: Shan
authors.forename: Lei
authors.initials: L
authors.lastname: Lei
authors.forename: Ya-jun
authors.initials: YJ
authors.lastname: Chen
authors.forename: Lian-hong
authors.initials: LH
authors.lastname: Jin
authors.forename: Jing-ling
authors.initials: JL
authors.lastname: Shen
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects*; D002478:Cells, Cultured; D003470:Culture Media; D053595:Embryonic Stem Cells / Q000166:cytology* / Q000187:drug effects; D005109:Extracellular Matrix / Q000502:physiology*; D005353:Fibronectins / Q000494:pharmacology; D007797:Laminin / Q000494:pharmacology; D051379:Mice; D009474:Neurons / Q000166:cytology* / Q000187:drug effects; D010455:Peptides / Q000494:pharmacology; D014212:Tretinoin / Q000494:pharmacology
chemical_list: D003470:Culture Media; D005353:Fibronectins; D007797:Laminin; D010455:Peptides; C008973:polyornithine; D014212:Tretinoin