title: Formation of germ-line chimeras from embryonic stem cells maintained with recombinant leukemia inhibitory factor.
abstract: Murine embryonic stem (ES) cells can be maintained as stem cells in vitro only in the presence of feeder cells or a soluble factor produced by a number of cell lines. We have previously demonstrated that leukemia inhibitory factor (LIF) is the molecule which prevents ES cell differentiation in culture. In this report we demonstrate that recombinant LIF can substitute for feeder cells in maintaining the full developmental potential of ES cells. The totipotent D3 ES cell line, previously isolated and maintained on growth-arrested primary embryo fibroblasts, was transferred to media supplemented with 1000 U/ml (10 ng/ml) recombinant LIF. In the presence of LIF the ES cells were maintained for over 2 months as undifferentiated cells in the absence of any feeder cells. When injected into blastocysts the ES cells which had been maintained in LIF-supplemented media efficiently formed germ-line chimeras.
authors.affiliation: European Molecular Biology Laboratory, Heidelberg, Federal Republic of Germany.
authors.forename: S
authors.initials: S
authors.lastname: Pease
authors.forename: R L
authors.initials: RL
authors.lastname: Williams
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000166:cytology / Q000187:drug effects; D002478:Cells, Cultured; D002678:Chimera; D003470:Culture Media / Q000032:analysis / Q000494:pharmacology; D004622:Embryo, Mammalian / Q000166:cytology* / Q000187:drug effects; D005314:Embryonic and Fetal Development / Q000187:drug effects; D006131:Growth Inhibitors; D015850:Interleukin-6; D053605:Leukemia Inhibitory Factor; D008222:Lymphokines / Q000032:analysis / Q000494:pharmacology*; D051379:Mice; D011994:Recombinant Proteins / Q000494:pharmacology; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects
chemical_list: D003470:Culture Media; D006131:Growth Inhibitors; D015850:Interleukin-6; D053605:Leukemia Inhibitory Factor; C507838:Lif protein, mouse; D008222:Lymphokines; D011994:Recombinant Proteins