Epitope topography controls bioactivity in supramolecular nanofibers

Shantanu Sur, Faifan Tantakitti, John B. Matson, Samuel I Stupp

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Incorporating bioactivity into artificial scaffolds using peptide epitopes present in the extracellular matrix (ECM) is a well-known approach. A common strategy has involved epitopes that provide cells with attachment points and external cues through interaction with integrin receptors. Although a variety of bioactive sequences have been identified so far, less is known about their optimal display in a scaffold. We report here on the use of self-assembled peptide amphiphile (PA) nanofiber matrices to investigate the impact of spatial presentation of the fibronectin derived epitope RGDS on cell response. Using one, three, or five glycine residues, RGDS epitopes were systematically spaced out from the surface of the rigid nanofibers. We found that cell morphology was strongly affected by the separation of the epitope from the nanofiber surface, with the longest distance yielding the most cell-spreading, bundling of actin filaments, and a round-to-polygonal transformation of cell shape. Cell response to this type of epitope display was also accompanied with activated integrin-mediated signaling and formation of stronger adhesions between cells and substrate. Interestingly, unlike length, changing the molecular flexibility of the linker had minimal influence on cell behavior on the substrate for reasons that remain poorly understood. The use in this study of high persistence length nanofibers rather than common flexible polymers allows us to conclude that epitope topography at the nanoscale structure of a scaffold influences its bioactive properties independent of epitope density and mechanical properties. This journal is

Original languageEnglish
Pages (from-to)520-532
Number of pages13
JournalBiomaterials Science
Volume3
Issue number3
DOIs
Publication statusPublished - Mar 1 2015

Fingerprint

Epitopes
Nanofibers
Bioactivity
Topography
Scaffolds
Integrins
Peptides
Display devices
Amphiphiles
Cell adhesion
Substrates
Scaffolds (biology)
Fibronectins
Glycine
Amino acids
Actins
Polymers
Cells
Mechanical properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Biomedical Engineering

Cite this

Epitope topography controls bioactivity in supramolecular nanofibers. / Sur, Shantanu; Tantakitti, Faifan; Matson, John B.; Stupp, Samuel I.

In: Biomaterials Science, Vol. 3, No. 3, 01.03.2015, p. 520-532.

Research output: Contribution to journalArticle

Sur, Shantanu ; Tantakitti, Faifan ; Matson, John B. ; Stupp, Samuel I. / Epitope topography controls bioactivity in supramolecular nanofibers. In: Biomaterials Science. 2015 ; Vol. 3, No. 3. pp. 520-532.
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