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Peptide-functionalized double network hydrogel with compressible shape memory effect for intervertebral disc

Chia-Yu Ho1, Chen-Chie Wang2,3, Tsung-Chiao Wu2

  • 1Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan.

Bioengineering & Translational Medicine
|March 17, 2023
PubMed
Summary

This study presents a novel double network hydrogel scaffold for intervertebral disc (IVD) regeneration. The scaffold successfully reconstructs injured IVD and promotes endogenous stem cell differentiation for improved IVD function.

Keywords:
biomimicrydouble network hydrogelintervertebral discmesenchymal stem cellpeptide functionalizationshape memory effect

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Intervertebral disc (IVD) degeneration is a significant cause of back pain.
  • Current treatments like disc transplantation have limitations in fully restoring IVD function.
  • Developing advanced biomaterials for IVD regeneration is crucial.

Purpose of the Study:

  • To develop a novel double network hydrogel scaffold for intervertebral disc (IVD) regeneration.
  • To mimic the native IVD structure and control the release of Growth Differentiation Factor-5 (GDF-5).
  • To enhance mesenchymal stem cell (MSC) recruitment and adhesion for improved regenerative outcomes.

Main Methods:

  • Fabrication of a cellulose-alginate double network hydrogel for annulus fibrosus (AF) and a cellulose hydrogel for nucleus pulposus (NP).
  • Incorporation of GDF-5 for MSC differentiation induction.
  • Modification of the scaffold with MSC homing and RGD peptides for enhanced cell interaction.
  • In vivo animal studies to evaluate IVD reconstruction and regeneration.

Main Results:

  • The developed IVD scaffold effectively mimics native IVD structure and mechanical properties (compressibility, shape memory, strength).
  • Controlled release of GDF-5 successfully induced differentiation of endogenous MSCs.
  • Peptide modifications significantly enhanced MSC homing and cell adhesion at the injury site.
  • In vivo studies confirmed successful reconstruction of both AF and NP in injured IVDs.

Conclusions:

  • The double network hydrogel scaffold shows significant promise for intervertebral disc (IVD) regeneration.
  • This approach facilitates endogenous stem cell recruitment and differentiation for tissue repair.
  • The scaffold's properties suggest potential for broader biomedical applications in tissue engineering.