期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 108, 期 29, 页码 11745-11750出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1101454108
关键词
multivalency; signal transduction; growth factor; phage display; extracellular matrix
资金
- University of Wisconsin, Materials Research Science and Engineering Center [DMR-0520527]
- National Institute of Allergy and Infectious Diseases [AI055258]
- W. M. Keck Foundation
In organisms, cell-fate decisions result from external cues presented by the extracellular microenvironment or the niche. In principle, synthetic niches can be engineered to give rise to patterned cell signaling, an advance that would transform the fields of tissue engineering and regenerative medicine. Biomaterials that display adhesive motifs are critical steps in this direction, but promoting localized signaling remains a major obstacle. We sought to exert precise spatial control over activation of TGF-beta signaling. TGF-beta signaling, which plays fundamental roles in development, tissue homeostasis, and cancer, is initiated by receptor oligomerization. We therefore hypothesized that preorganizing the transmembrane receptors would potentiate local TGF-beta signaling. To generate surfaces that would nucleate the signaling complex, we employed defined self-assembled monolayers that present peptide ligands to TGF-beta receptors. These displays of nondiffusible ligands do not compete with the growth factor but rather sensitize bound cells to subpicomolar concentrations of endogenous TGF-beta. Cells adhering to the surfaces undergo TGF-beta-mediated growth arrest and the epithelial to mesenchymal transition. Gene expression profiles reveal that the surfaces selectively regulate TGF-beta responsive genes. This strategy provides access to tailored surfaces that can deliver signals with spatial control.
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