Abstract
Growth of human embryonic stem (hES) cells as a pluripotent population requires a balance between survival, proliferation and self-renewal signals. Here we demonstrate that hES cells express receptors of the tropomyosin-related kinase (TRK) family, which mediate antiapoptotic signals. We show that three TRK ligands, brain-derived neurotrophic factor, neurotrophin 3 and neurotrophin 4, are survival factors for hES cells. Addition of neurotrophins to hES cell cultures effects a 36-fold improvement in their clonal survival. hES cell cultures maintained in medium containing neurotrophins remain diploid and retain full developmental potency. In the presence of neurotrophins, TRK receptors in hES cells are phosphorylated; TRK receptor inhibition leads to hES cell apoptosis. The survival activity of neurotrophins in hES cells is mediated by the phosphatidylinositol-3-kinase pathway but not the mitogen-activated protein kinase pathway. Neurotrophins improve hES cell survival and may facilitate their manipulation and the development of high-throughput screens to identify factors responsible for hES cell differentiation.
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Acknowledgements
We are indebted to Linzhao Cheng, Ira Daar, Lino Tessarollo, Brad Harris, John Gearhart and Ian McNiece for helpful suggestions and comments; Lino Tessarollo, Gautam Dravid, David Ginty, Hongjun Song, Xin Duan, Pantelis Tsoulfas, Karen Lackey and Rasi Wickramsinghe for reagents and advice; and Gail Stetten and the Cytogenetics Facility for karyotype analysis. We are also grateful to Sean Donovan and Robert Clouse III for their support and patience and members of the Donovan Lab for their support and encouragement. L.F.L. and P.J.D. dedicate this work to Camilynn I. Brannan (1963–2002). This work was supported by a National Research Service Award (to A.D.P.) by a National Institutes of Health Grant (to P.J.D.) and by institutional funds from the Johns Hopkins University School of Medicine (to L.F.L. and P.J.D.).
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Supplementary information
Supplementary Fig. 1
Expression of neurotrophins receptors on H9 hES cells and controls for antibody reactivity. (PDF 701 kb)
Supplementary Fig. 2
Effect of neurotrophins on hES cell differentiation and TRK phosphorylation. (PDF 1602 kb)
Supplementary Fig. 3
Effect of neurotrophins on the population doubling time of hES cells. (PDF 875 kb)
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Pyle, A., Lock, L. & Donovan, P. Neurotrophins mediate human embryonic stem cell survival. Nat Biotechnol 24, 344–350 (2006). https://doi.org/10.1038/nbt1189
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DOI: https://doi.org/10.1038/nbt1189