Open-Spaced Ridged Hydrogel Scaffolds Containing TiO2-Self-Assembled Monolayer of Phosphonates Promote Regeneration and Recovery Following Spinal Cord Injury

Ahad M. Siddiqui, Frederic Thiele, Rachel N. Stewart, Simone Rangnick, Georgina J. Weiss, Bingkun K. Chen, Jodi L. Silvernail, Tammy Strickland, Jarred J. Nesbitt, Kelly Lim, Jean E. Schwarzbauer, Jeffrey Schwartz, Michael J. Yaszemski, Anthony J. Windebank, Nicolas N. Madigan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The spinal cord has a poor ability to regenerate after an injury, which may be due to cell loss, cyst formation, inflammation, and scarring. A promising approach to treating a spinal cord injury (SCI) is the use of biomaterials. We have developed a novel hydrogel scaffold fabricated from oligo(poly(ethylene glycol) fumarate) (OPF) as a 0.08 mm thick sheet containing polymer ridges and a cell-attractive surface on the other side. When the cells are cultured on OPF via chemical patterning, the cells attach, align, and deposit ECM along the direction of the pattern. Animals implanted with the rolled scaffold sheets had greater hindlimb recovery compared to that of the multichannel scaffold control, which is likely due to the greater number of axons growing across it. The immune cell number (microglia or hemopoietic cells: 50–120 cells/mm2 in all conditions), scarring (5–10% in all conditions), and ECM deposits (Laminin or Fibronectin: approximately 10–20% in all conditions) were equal in all conditions. Overall, the results suggest that the scaffold sheets promote axon outgrowth that can be guided across the scaffold, thereby promoting hindlimb recovery. This study provides a hydrogel scaffold construct that can be used in vitro for cell characterization or in vivo for future neuroprosthetics, devices, or cell and ECM delivery.

Original languageEnglish (US)
Article number10250
JournalInternational journal of molecular sciences
Volume24
Issue number12
DOIs
StatePublished - Jun 2023

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Spectroscopy
  • Catalysis
  • Inorganic Chemistry
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry

Keywords

  • Schwann cells
  • axon regeneration
  • biomaterials
  • immune cells
  • machine learning
  • mesenchymal stromal cells (MSCs)
  • oligo(poly(ethylene glycol)) fumarate
  • scarring
  • spinal cord injury
  • titanium dioxide

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