Derivation of pluripotent epiblast stem cells from mammalian embryos

Brons, I. Gabrielle M.; Smithers, Lucy E.; Trotter, Matthew W. B.; Rugg-Gunn, Peter; Bowen Sun; Chuva de Sousa Lopes, Susana M.; Howlett, Sarah K.; Clarkson, Amanda; Ahrlund-Richter, Lars; Pedersen, Roger A.; Vallier, Ludovic
July 2007
Nature;7/12/2007, Vol. 448 Issue 7150, p191
Academic Journal
Although the first mouse embryonic stem (ES) cell lines were derived 25 years ago using feeder-layer-based blastocyst cultures, subsequent efforts to extend the approach to other mammals, including both laboratory and domestic species, have been relatively unsuccessful. The most notable exceptions were the derivation of non-human primate ES cell lines followed shortly thereafter by their derivation of human ES cells. Despite the apparent common origin and the similar pluripotency of mouse and human embryonic stem cells, recent studies have revealed that they use different signalling pathways to maintain their pluripotent status. Mouse ES cells depend on leukaemia inhibitory factor and bone morphogenetic protein, whereas their human counterparts rely on activin (INHBA)/nodal (NODAL) and fibroblast growth factor (FGF). Here we show that pluripotent stem cells can be derived from the late epiblast layer of post-implantation mouse and rat embryos using chemically defined, activin-containing culture medium that is sufficient for long-term maintenance of human embryonic stem cells. Our results demonstrate that activin/Nodal signalling has an evolutionarily conserved role in the derivation and the maintenance of pluripotency in these novel stem cells. Epiblast stem cells provide a valuable experimental system for determining whether distinctions between mouse and human embryonic stem cells reflect species differences or diverse temporal origins.


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