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Proc Natl Acad Sci U S A. 2013 Aug 6;110(32):12887-92. doi: 10.1073/pnas.1222880110. Epub 2013 Jul 25.

Polysaccharide hydrogels with tunable stiffness and provasculogenic properties via α-helix to β-sheet switch in secondary structure.

Author information

1
Institute for Macromolecular Chemistry, University of Freiburg, 79104 Freiburg, Germany.

Abstract

Mechanical aspects of the cellular environment can influence cell function, and in this context hydrogels can serve as an instructive matrix. Here we report that physicochemical properties of hydrogels derived from polysaccharides (agarose, κ-carrageenan) having an α-helical backbone can be tailored by inducing a switch in the secondary structure from α-helix to β-sheet through carboxylation. This enables the gel modulus to be tuned over four orders of magnitude (G' 6 Pa-3.6 × 10(4) Pa) independently of polymer concentration and molecular weight. Using carboxylated agarose gels as a screening platform, we demonstrate that soft-carboxylated agarose provides a unique environment for the polarization of endothelial cells in the presence of soluble and bound signals, which notably does not occur in fibrin and collagen gels. Furthermore, endothelial cells organize into freestanding lumens over 100 μm in length. The finding that a biomaterial can modulate soluble and bound signals provides impetus for exploring mechanobiology paradigms in regenerative therapies.

KEYWORDS:

angiogenesis; cell carrier; extracellular matrix; regenerative medicine; vascular biology

PMID:
23886665
PMCID:
PMC3740890
DOI:
10.1073/pnas.1222880110
[Indexed for MEDLINE]
Free PMC Article

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