title: Selective removal of undifferentiated embryonic stem cells from differentiation cultures through HSV1 thymidine kinase and ganciclovir treatment.
abstract: Pluripotent cell lines such as embryonic stem cells are an attractive source for a potential cell replacement therapy. However, transplantation of differentiated cells harbors the risk of teratoma formation, presenting a serious health risk. To overcome this obstacle, a negative selection system was established that permits selective removal of undifferentiated cells during in vitro differentiation. Use of the HSV1 thymidine kinase and eGFP under the control of the Oct4 promoter allowed the destruction of undifferentiated ES cells by ganciclovir treatment; differentiated cells were unharmed. Clonal ES cells remained pluripotent and showed positive staining for a wide range of embryonic markers. Thus, treatment with ganciclovir during in vitro differentiation effectively removed the population of undifferentiated cells and provided a pure population of completely differentiated cells. This approach may pave the way for a safe application of ES cells in regenerative medicine in the future.
authors.affiliation: Institute of Clinical Biochemistry, Hannover Medical School, 30625, Hannover, Germany. naujok.ortwin@mh-hannover.de
authors.forename: Ortwin
authors.initials: O
authors.lastname: Naujok
authors.forename: Joanna
authors.initials: J
authors.lastname: Kaldrack
authors.forename: Terbish
authors.initials: T
authors.lastname: Taivankhuu
authors.forename: Anne
authors.initials: A
authors.lastname: Jörns
authors.forename: Sigurd
authors.initials: S
authors.lastname: Lenzen
mesh_terms: D000998:Antiviral Agents / Q000494:pharmacology; D018929:Cell Culture Techniques; D002454:Cell Differentiation / Q000187:drug effects; D002469:Cell Separation; D002478:Cells, Cultured; D002999:Clone Cells; D053595:Embryonic Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D015774:Ganciclovir / Q000494:pharmacology*; D041722:Genes, Transgenic, Suicide; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D018259:Herpesvirus 1, Human / Q000201:enzymology / Q000235:genetics*; D006801:Humans; D050814:Octamer Transcription Factor-3 / Q000235:genetics; D011401:Promoter Regions, Genetic; D013937:Thymidine Kinase / Q000235:genetics* / Q000378:metabolism
chemical_list: D000998:Antiviral Agents; D050814:Octamer Transcription Factor-3; C494173:POU5F1 protein, human; D049452:Green Fluorescent Proteins; D013937:Thymidine Kinase; D015774:Ganciclovir
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