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Sci. STKE, 14 August 2007
Vol. 2007, Issue 399, p. cm1
[DOI: 10.1126/stke.3992007cm1]


TGF-beta Signaling in Development

Krit Kitisin1, Tapas Saha1, Tiffany Blake1, Nady Golestaneh1, Merlyn Deng1, Christine Kim1, Yi Tang1, Kirti Shetty1, Bibhuti Mishra1, and Lopa Mishra1,2*

1Laboratory of Cancer Genetics and Digestive Diseases, Department of Surgery, Department of Medicine, and Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20007, USA.
2Department of Veterans Affairs Medical Center, Washington, DC 20007, USA.

Abstract: The transforming growth factor–beta (TGF-beta) superfamily comprises nearly 30 growth and differentiation factors that include TGF-betas, activins, inhibins, and bone morphogenetic proteins (BMPs). Multiple members of the TGF-beta superfamily serve key roles in stem cell fate commitment. The various members of the family can exhibit disparate roles in regulating the biology of embryonic stem (ES) cells and tumor suppression. For example, TGF-beta inhibits proliferation of multipotent hematopoietic progenitors, promotes lineage commitment of neural precursors, and suppresses epithelial tumors. BMPs block neural differentiation of mouse and human ES cells, contribute to self-renewal of mouse ES cells, and also suppress tumorigenesis. ES cells and tumors may be exposed to multiple TGF-beta members, and it is likely that the combination of growth factors and cross-talk among the intracellular signaling pathways is what precisely defines stem cell fate commitment. This Connections Map Pathway in the Database of Cell Signaling integrates signaling not only from TGF-beta and BMP but also from the ligands nodal and activin, and describes the role of the signaling pathways activated by these ligands in mammalian development. Much of the evidence for the connections shown comes from studies on mouse and human ES cells or mouse knockouts. This pathway is important for understanding not only stem cell biology, but also the molecular effectors of TGF-beta and BMP signaling that may contribute to cancer suppression or progression and thus are potential targets for therapeutic intervention.

*Corresponding author. E-mail, lopamishra{at}

Citation: K. Kitisin, T. Saha, T. Blake, N. Golestaneh, M. Deng, C. Kim, Y. Tang, K. Shetty, B. Mishra, L. Mishra, TGF-beta Signaling in Development. Sci. STKE 2007, cm1 (2007).

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