title: "The good into the pot, the bad into the crop!"--a new technology to free stem cells from feeder cells.
abstract: A variety of embryonic and adult stem cell lines require an initial co-culturing with feeder cells for non-differentiated growth, self renewal and maintenance of pluripotency. However for many downstream ES cell applications the feeder cells have to be considered contaminations that might interfere not just with the analysis of experimental data but also with clinical application and tissue engineering approaches. Here we introduce a novel technique that allows for the selection of pure feeder-freed stem cells, following stem cell proliferation on feeder cell layers. Complete and reproducible separation of feeder and embryonic stem cells was accomplished by adaptation of an automated cell selection system that resulted in the aspiration of distinct cell colonies or fraction of colonies according to predefined physical parameters. Analyzing neuronal differentiation we demonstrated feeder-freed stem cells to exhibit differentiation potentials comparable to embryonic stem cells differentiated under standard conditions. However, embryoid body growth as well as differentiation of stem cells into cardiomyocytes was significantly enhanced in feeder-freed cells, indicating a feeder cell dependent modulation of lineage differentiation during early embryoid body development. These findings underline the necessity to separate stem and feeder cells before the initiation of in vitro differentiation. The complete separation of stem and feeder cells by this new technology results in pure stem cell populations for translational approaches. Furthermore, a more detailed analysis of the effect of feeder cells on stem cell differentiation is now possible, that might facilitate the identification and development of new optimized human or genetically modified feeder cell lines.
authors.affiliation: Institute for Research in Operative Medicine (IFOM), Faculty of Medicine, University of Witten/Herdecke, Witten, Germany.
authors.forename: Annette
authors.initials: A
authors.lastname: Schneider
authors.forename: Dimitry
authors.initials: D
authors.lastname: Spitkovsky
authors.forename: Peter
authors.initials: P
authors.lastname: Riess
authors.forename: Marek
authors.initials: M
authors.lastname: Molcanyi
authors.forename: Naidu
authors.initials: N
authors.lastname: Kamisetti
authors.forename: Marc
authors.initials: M
authors.lastname: Maegele
authors.forename: Jürgen
authors.initials: J
authors.lastname: Hescheler
authors.forename: Ute
authors.initials: U
authors.lastname: Schaefer
mesh_terms: D000818:Animals; D001483:Base Sequence; D001709:Biotechnology; D002454:Cell Differentiation; D049109:Cell Proliferation; D002469:Cell Separation / Q000379:methods*; D018920:Coculture Techniques / Q000379:methods*; D017931:DNA Primers / Q000235:genetics; D053595:Embryonic Stem Cells / Q000166:cytology / Q000378:metabolism; D049452:Green Fluorescent Proteins / Q000235:genetics; D007381:Intermediate Filament Proteins / Q000378:metabolism; D051379:Mice; D032383:Myocytes, Cardiac / Q000166:cytology / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000378:metabolism; D064231:Nestin; D009474:Neurons / Q000166:cytology / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013234:Stem Cells / Q000166:cytology* / Q000378:metabolism
chemical_list: D017931:DNA Primers; D007381:Intermediate Filament Proteins; C577484:NES protein, human; D009419:Nerve Tissue Proteins; C577485:Nes protein, mouse; D064231:Nestin; D011994:Recombinant Proteins; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins