Nano-textured self-assembled aligned collagen hydrogels promote directional neurite guidance and overcome inhibition by myelin associated glycoprotein

Mohammad T. Abu-Rub, Kristen L. Billiar, Maarten H. Van Es, Andrew Knight, Brian J. Rodriguez, Dimitrios I. Zeugolis, Siobhan McMahon, Anthony J. Windebank, Abhay Pandit

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

The development of nerve guidance conduits is constantly evolving as the need arises for therapies for spinal cord injury. In addition to providing a path for regrowing axons to reconnect with their appropriate targets, the structural and biochemical cues provided by these conduits should be permissive for directional neurite outgrowth and be protective against inhibition in the vicinity of the injury site. Here, we adapted the use of iso-electric focusing to drive the alignment of supramolecular fibrils into self-assembled collagen hydrogels (∼300 m diameter), and tested those hydrogels for the ability to direct and enhance the migration of neurites. Structural characterization revealed anisotropic alignment of nanofibrillar aggregates (∼20 nm diameter), arranged in micron-scale bundles (∼1 to 2 m diameter) similar to the hierarchical size scales observed in native tissues. Neurite outgrowth extended bidirectionally along the axes of aligned hydrogels. Furthermore, it was shown that, as opposed to poly-d-lysine, neurite outgrowth on aligned hydrogels is not inhibited in the presence of myelin-associated glycoprotein (p > 0.05). These results highlight for the first time a structural and biochemical role for iso-electrically aligned collagen hydrogels in controlling neuronal growth, and indicate that the short-term signaling associated with these hydrogels can be used in adjunct therapy following injury to the spinal cord.

Original languageEnglish (US)
Pages (from-to)2770-2781
Number of pages12
JournalSoft Matter
Volume7
Issue number6
DOIs
StatePublished - Mar 21 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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    Abu-Rub, M. T., Billiar, K. L., Van Es, M. H., Knight, A., Rodriguez, B. J., Zeugolis, D. I., McMahon, S., Windebank, A. J., & Pandit, A. (2011). Nano-textured self-assembled aligned collagen hydrogels promote directional neurite guidance and overcome inhibition by myelin associated glycoprotein. Soft Matter, 7(6), 2770-2781. https://doi.org/10.1039/c0sm01062f