title: Stable maintenance of monkey embryonic stem cells in the absence of bFGF.
abstract: Monkey embryonic stem (ES) cells are useful tools in preclinical studies of gene therapy and tissue engineering as well as in primate developmental biology. However, their maintenance is not easy, requiring addition of bFGF to the medium. Herein, we have described a stable, cost-effective method that does not require bFGF. We used a high-density (1 to 1.5x10(5) cells/cm2) of mouse embryonic fibroblasts (MEF) as feeder cells to successfully maintain undifferentiated monkey ES cells for 2 years (approximately 150 passages). Furthermore, these ES cells were competent for electroporation of enhanced green fluorescent protein (EGFP) and subsequent drug selection procedures. We were able to establish EGFP-expressing cell lines using this culture condition. These cell lines expressed undifferentiated markers, such as alkaline phosphatase, SSEA-4, TRA-60, and TRA-81. In addition, strong EGFP expression was observed after differentiation into cardiomyocytes, neurons, or adipocytes, suggesting that these cell lines are a useful tool to study cell transplantation. This method simplifies the culture of monkey ES cells.
authors.affiliation: Research Center for Animal Life Science, Shiga University of Medical Science, Ohtsu, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Yamashita
authors.forename: T
authors.initials: T
authors.lastname: Takada
authors.forename: G
authors.initials: G
authors.lastname: Yamamoto
authors.forename: R
authors.initials: R
authors.lastname: Torii
mesh_terms: D000818:Animals; D018929:Cell Culture Techniques / Q000379:methods; D002454:Cell Differentiation; D004622:Embryo, Mammalian; D016222:Fibroblast Growth Factor 2 / Q000502:physiology*; D008252:Macaca fascicularis; D013234:Stem Cells / Q000166:cytology*
chemical_list: D016222:Fibroblast Growth Factor 2