Micro- and nano-patterned elastin-like polypeptide hydrogels for stem cell culture

A. Paul, M. Stührenberg, S. Chen, D. Rhee, W. K. Lee, T. W. Odom, S. C. Heilshorn, A. Enejder

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We show that submicron-sized patterns can be imprinted into soft, recombinant-engineered protein hydrogels (here elastin-like proteins, ELP) by transferring wavy patterns from polydimethylsiloxane (PDMS) molds. The high-precision topographical tunability of the relatively stiff PDMS is translated to a bio-responsive, soft material, enabling topographical cell response studies at elastic moduli matching those of tissues. Aligned and unaligned wavy patterns with mold periodicities of 0.24-4.54 μm were imprinted and characterized by coherent anti-Stokes Raman scattering and atomic force microscopy. The pattern was successfully transferred down to 0.37 μm periodicity (width in ELP: 250 ± 50 nm, height: 70 ± 40 nm). The limit was set by inherent protein assemblies (diameter: 124-180 nm) that formed due to lower critical solution temperature behavior of the ELP during molding. The width/height of the ELP ridges depended on the degree of hydration; from complete dehydration to full hydration, ELP ridge width ranged from 79 ± 9% to 150 ± 40% of the mold width. The surface of the ridged ELP featured densely packed protein aggregates that were larger in size than those observed in bulk/flat ELP. Adipose-derived stem cells (ADSCs) oriented along hydrated aligned patterns with periodicities ≥0.60 μm (height ≥170 ± 100 nm), while random orientation was observed for smaller distances/amplitudes, as well as flat and unaligned wavy ELP surfaces. Hence, micro-molding of ELP is a promising approach to create tissue-mimicking, hierarchical architectures composed of tunable micron-sized structures with nano-sized protein aggregates, which opens the way for orthogonal screening of cell responses to topography and cell-adhesion ligands at relevant elastic moduli.

Original languageEnglish
Pages (from-to)5665-5675
Number of pages11
JournalSoft Matter
Volume13
Issue number34
DOIs
Publication statusPublished - Jan 1 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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    Paul, A., Stührenberg, M., Chen, S., Rhee, D., Lee, W. K., Odom, T. W., Heilshorn, S. C., & Enejder, A. (2017). Micro- and nano-patterned elastin-like polypeptide hydrogels for stem cell culture. Soft Matter, 13(34), 5665-5675. https://doi.org/10.1039/c7sm00487g